Disadvantages: high output impedance, low load capacityYLE Crank Position Sensors

Capacitance weighing sensor capacity by the electrode geometry restriction very difficult to do, generally tens to hundreds of micro method, even only a few micro method. Therefore, the output impedance capacitive weighing sensor is high, so the load capacity is poor, vulnerable to outside interference produced unstable phenomenon, serious and even unable to work. We must take shielding measures properly, to design and the use of inconvenience. Capacitance sensor also requires insulation resistance value is extremely high, otherwise the insulation performance of part as bypass resistance and affect the instrument, so we should also pay special attention to YLE Engine Temperature Sensors surrounding environment such as temperature, cleanliness, etc.. If the use of high frequency power supply, can reduce the output capacitance weighing sensor resistance, but the high frequency amplifier, sensor than low frequency complex, and the effect of parasitic capacitance, is not easy to ensure the stability of the work.Two shortcomings: output characteristics of nonlinearThe output characteristic of capacitance weighing sensor is nonlinear, although the use of differential type to improve, but YLE Camshaft Positioning Sensorcan not be completely eliminated. Capacitance sensor for other types of only ignores the edge effect of electric field, the output characteristics is linear. Additional capacitance or the edge effect will be directly superimposed sensor capacitor, the output characteristics of nonlinear.

YLE Coolant Temperature Sensor Motion sensor new direction

Now sensor technology has been greatly improved, the application of the sensor which has been around in various industries . The motion sensor is a sensor in one of the many types now Send a motion sensor 've got a new direction , the future will be more compact motion sensor , implementation costs will be cheaper .A digital compass mounted in a mobile device , a gyroscope and accelerometer located in a wide variety of location-based service application, and also used in some new ways of controlling a mobile device, such as by shaking and flicking operation control micro device . This YLE Automotive Temperature Sensors progress will be extended motion sensor range of applications, such as running shoes and tennis rackets can also be placed in the sensor , use a more simple manufacturing method for manufacturing a new type of digital compass. Next year , this technology will be applied to the GPS device. The company alsomanufactures accelerometers and gyroscopes prototype equipment , and plans combination of these three types of sensor digital compass on a chip traditional manufacturing methods are complementary metal oxide semiconductor (CMOS) fabrication method. This method is the most common method of microchips and electronic control circuit production. However, someconfigurations of the compass comprises a method of manufacturing such a magnetic field concentrator , it is necessary then to add up the chip produced , thereby increasing the complexity and cost of the chip . " The basic difference is our compass is completely manufactured in a standard complementary metal-oxide semiconductor YLE Crankshaft Sensor Replacementmanufacturing method completed . This new law enables the use of the Lorentz force due to the phenomenon of the compass , while most commercial digital compass use is a different phenomenon - Hall effect (theHallEffect), by passing a current through the conductor and measuring the change in voltage due to the Earth's magnetic compass so that the resulting work contrary, the Lorentz force when the current through the conductor material . magnetic force generated by a mobile device may be a Lorentz force on the object orientation determined by measuring the displacement of the Earth's magnetic field of the object .The chip is manufactured in a conventional silicon etching nanoscale MEMS (MEMS). There is a suspension of the elastic element of aluminum in the nanoscale MEMS devices. When a mobile device driven by the current through the aluminum when the bunch , there is no magnetic field generates a Lorentz force acts on the impact of resonance and aluminum . Two opposite sides of the aluminum metal sheet is detected by the change of the aluminum occurred. Small mobile device by measuring the change in capacitance produced on the two pieces of metal, it is possible to measure the magnetic field in one direction . Using a set of three such sensors , the mobile device can determine the direction and orientation of the Earth's magnetic field . "Compared with the conventional sensor , the MEMS and the combination of complementary metal oxide semiconductor technology will improve the sensitivity of the sensor , the sensor chip and reduce the volume and reduce the cost of the chip ." Nano group University of Southampton nanoelectronics professor HiroshiMizuta said.

Angle sensors installed in the car 's rapid unloading

According to the characteristics of the car quickly Unloading cement plant , grinding mills and other occasions , with unloading convenient, reliable , fast, save manpower, reduce labor intensity and improve working conditions , to reduce pollution of the environment , thereby reducing production costs , ease of automate operations management. There are a lot of fast cars unloading machine sensors, of course, the current trend is not difficult to see that YLE Motor Position Sensor smart devices will be more and more, angle sensors on the car quickly unloading machine currently used widely.Unloading the car quickly for fast unloading coal, food, electricity , mining, metallurgy and other industries bulk materials . When heavy transport vehicle to carry provisions on flat or retreated position , the driver will get off after the car with the handbrake brake tight, ready to open the door after unloading . In this process, there is someone responsible for checking to confirm whether the rear car reaches a predetermined position , where there is the use of the angle sensor , automatically rise of two gear wheel plate will block the wheels to prevent the vehicle is automatically raised when the dump material decline. Reconfirmed by transport vehicles blocked the rear wheel plate blocked , they will be able to indicate the operator first open dust shields, then start rising carrying two flat under the lift , the rate of decline is determined according to unload the material , the master optimum lift angle, the maximum tilt angle is 45 degrees. When the material emptied after a smooth landing , and finally down to the level of the long position , recovery gear wheel flat plate , moving dust mask , ready for the next unloading .Frequently used measurement range ± 60 degree angle uniaxial angle YLE Coolant Temperature Sensor , ± 0.08 degrees absolute measurement accuracy , IP65/67 degree of protection and aluminum housing such that it can well adapt to the complex for use in the outdoor environment dumper , 11ms impact resistance and 8grms, 20 ~ 2000Hz resistance to vibration after shock and vibration to ensure people can work, temperature compensation -40 degrees to 85 degrees , making the temperature sensor to measure the impact of very small , 9 ~ 36VDC broadband suspicious voltage power supply using the dump itself , not only to achieve the analog current and voltage output , can also be achieved RS232 or RS485 digital signal output , and even the form of the car used in the cAN data output .Currently, the installation angle sensor in the car quickly unloading machine has become a trend , it will be expected to achieve real intelligent.

Rectified DC power supply system sensor design elements

DC power meter management control in electrolysis industry has a pivotal position , it is one of the main technical assessment indicators tapping the potential of business efficiency , but also to protect one regulating rectifier power source running smoothly , so that the DC sensor power rectifier system accurate, stable and reliable is very important.As we all know , the current domestic market popular DC current sensors and closed-loop two separate forms , and the two forms of Car Temperature Sensor measurement accuracy has its theoretical basis , are based on the current Hall elements collected by the air gap in the magnetic circuit and the magnetic field is proportional to the voltage signal converted over , under current law the theoretical framework of the whole design .Factors affecting the DC sensor measurement accuracy depends largely on the choice of the core and the Hall device , as much as possible to ensure the performance of magnetic materials , magnetic materials forming around them a special process to deal with the structure , making the magnetic material permeability is improved, so that Coolant Temperature Sensor has been effectively guaranteed linearity . In the Hall devices , the requirements of its good work in the constant temperature stability and output linearity , and with good frequency characteristics.DC sensor circuit board preferably double-sided gold-plated plate , electrical connector preferred fasteners to ensure high reliability products ; temperature compensation process in terms of a single Hall element to prevent the influence of temperature on the outside of the electronic Crank Position Sensor concentrated in a circuit portion controlled thermostat box inside , avoiding the influence of a local temperature coefficient of the offset caused by the change in the system occurs , thus ensuring the high stability of the product ; the sensor selection circuit structure is preferably three differential amplifier circuit , eliminating the Hall element is greater than the output resistance of the op amp input resistance generated errors. After stage amplifier circuit sensor multistage isolation amplifier output , the output signal interfere with each other , so that the DC current meter with large access control system is very convenient. Multiple parallel rectifier , when one station blackout, straight nets reverse side short circuit short-circuit current is large, the contact sensor to set a limit reverse current protection , to reverse the protective effect of the rectifier unit.

The definition and use of fiber Bragg grating sensors

FBG sensors sensing process is modulated by external parameters on the Prague center wavelength pass to get emotional interest , which is a wavelength modulation type optical fiber Shaft Position Sensor, FBG sensors should therefore belong in a special class of optical fiber sensors . Currently fiber grating and its application in optical fiber sensors and optical fiber communications caused widespread concern.FBG sensors can directly measure temperature , strain and other physical quantities . As the fiber grating wavelength sensitive to temperature and strain simultaneously , namely temperature and strain caused by the fiber grating coupler wavelength while moving , making it impossible to distinguish between temperature and strain by measuring the wavelength of the fiber grating coupler move .FBG Car Temperature Sensor have immunity to electromagnetic interference , signal bandwidth , high sensitivity , ease of reuse, light weight, and so is suitable for use in high temperature, corrosive hazardous environments advantages. Since 1989 the United States Morey , who first studied strain and temperature sensor FBG conducted since the world are very concerned and carried out its extensive applied research, in just 10 years time has become the FBG sensor field development fastest growing technology and success in many fields of application , FBG sensors have a very wide range of applications in large-scale construction and safety monitoring wells and other special occasions.

What is the characteristics of strain pressure sensor

Pressure sensor is a kind of commonly used sensors, widely used in medical, ships, aerospace, petrochemical, machine tools and other industries. Pressure sensors need to know when in use of knowledge is also a lot of, among them the characteristics of strain pressure sensor for users is also a need to understand, here is for everyone to introduce what is the characteristics of strain pressure Automobile Temperature Sensor.The measuring range of the pressure sensor is twice as big as the inductive sensor, it can not only detect metal target, but also detect dielectric, such as paper, glass, wood and plastics, and even can be detected by a wall or paper shell. Because the human body in low frequency is equal to the electrical conductor, thus can be used for the quiver measurement and alarm.
In the measurement of strain, the strain gauges can be on the component, but if the measuring force, pressure, acceleration, should first change the physical quantity measuring strain, and strain gage, a conversion process more than direct measurement, to complete the conversion process is usually called the original as the elastic elements, therefore, the strain Camshaft Position Sensor is usually made of elastic sensitive components and the strain gauge is composed of two parts.
Elastic sensitive element is a core component of sensor, elastic component of elastic energy storage requirements high, usually expressed as elastic material storage and deformation work without permanent deformation. Pressure sensor has good mechanical processing and heat treatment performance, has high compressive strength. Influence of temperature and other characteristics, correct choice of elastic sensitive components and strain gauge bridge is an important way to improve the strain sensor:
1 measuring range, high precision, the force sensor can measure the force of 0.01--1000000N, the accuracy can reach more than 0.05%FS; the pressure sensor can measure the pressure of 0.1-1000000, the accuracy can reach 0.1%FS.
2, stable and reliable performance, long service life, such as weighing type mechanical lever, the lever, the knife edge part of mutual friction loss and deformation, we want to maintain its accuracy is quite difficult, using resistance strain weighing sensor made of electronic pump, truck scale, railway scale, long-term stable operation in harsh environmental conditions.
3, the frequency response characteristic of excellent. Pressure sensors of resistance strain gauge response time is 0.01MS, the dynamic process of semiconductor strain gauge can reach strain sensor if 0.001MS can take measures in the elastic component is constitute by them can be measured in tens or even hundreds of Hertz hz.

Building materials used in the experiments

In building materials , especially concrete drying process, we should pay attention to the drying trend, which is one of the indicators of the evaluation of products, but also for the construction side to provide a reliable data. Application of temperature and humidity Crank Shaft Position Sensor can record this data and provide building materials research side , the construction will provide useful help . Especially in military construction , time is life , accurately grasp the concrete drying time is starting cause the enemy , in order to effectively provide the vital forces on the battlefield to provide a guarantee , this feature can be completed by the temperature and humidity Crankshaft Positioning Sensor. Monitoring and recording of temperature , can confirm its quality assurance Immunization . Temperature and humidity sensors convenient and reliable solution to this problem. Different vaccines , the vaccine with different storage temperature requirements . To ensure that bacteria, vaccine safety during storage and transport , and storage and transportation process must be carried out to detect the ambient temperature record of the whole process , and should be fully automated detection recording , there should be no human factors , in order to improve data reliability. High quality precision temperature and humidity sensors can perfectly accomplish this function , because it can also be a long record in the absence of external power supply situation.

The role of the crankshaft sensor

An engine ignition time ( say a little simple, it is the moment of spark ignition , the corresponding crankshaft position ) , is to be very accurate ( correct to say that there is a range in which the crankshaft to an angle within the range requiring Fireworks plug ignition , not to this position the crankshaft , the ignition spark plug , the engine is possible that the normal work ) , the carburetor before the car, with a mechanical power switch to control the spark plug , Just go to Camshaft Position Sensor , spark plugs will ignite. . . Now all electronically controlled , and , then , go to the computer you want to know what the crankshaft angle ( position ) , you can only think of ways to engage an electrical signal , let the computer know what angle to the crankshaft in the end , but to the best one ignition position , the computer controlled ignition . . . . Second, the crankshaft position only to have strict requirements ignition timing , fuel injection is relatively minor, because , injection slowly earlier , the impact of work on launching fee is not great, but , if ignition is not normal , then a great impact . Third, there is a common crank Car Temperature Sensor , electromagnetic ( on a side of the crankshaft gear . Front chainring ) , a simplified physical model is a small permanent magnet generator , it is the most common kind , ,,, , the other type of photoelectric ( a small disc , open at the many small holes in the upper and lower plate , mounting points corresponding to the device and the photosensitive device , a light emitting element , the light emitted when the circle hole position to the disk , the light shine on the photosensitive member following the reception of light ) , light is actually a simplified model of the battery , there is a Hall sensor . . , Swiss road running car , more than 95 % of all first .

Air temperature sensor

Automatic air conditioning system temperature sensor includes : engine coolant temperature sensor , in-car temperature Sensor Camshaft , ambient temperature sensor , evaporator temperature sensor. According to these sensor signals the control unit calculates the desired blowing air inside the cabin temperature , select the desired amount of air , and then control the air mixture inlet valve, out of air intake converter board , etc., within the temperature range set by the driver automatically adjust the temperature inside the cabin , to achieve the best , and automatic control of air conditioning on and off. One condition is that the air conditioning system refrigerant temperature higher than the room temperature, the ambient Engine Water Temperature Sensor circuit , the terminal water , poor contact or poor ground , the data stream will be displayed below the ambient temperature -30 ℃, will cause no refrigeration . Meanwhile, the engine coolant temperature sensor circuit or ground wire is bad, the signal loss of time, the cooling fan does not turn , lead to poor air conditioning cooling, will enter the fail-safe , so air conditioning stopped working

The structure and working principle of the knock sensor

Knock sensor is an important component of engine electronic control system, its function is to detect whether the engine detonation, and the signal sent to ECU engine. Knock sensor common has two kinds, one is the magnetostrictive knock sensor, a piezoelectric type knock sensor. Magnetostriction type knock Engine Water Temperature Sensor in which a permanent magnet, permanent magnet excitation by around the magnetic core and the iron core coil. Its working principle is: when the engine cylinder block vibration,Car Temperature Sensoris about 7kHz and the engine to produce resonance, strong magnetic material core permeability changes, resulting in a permanent magnet flux density through the core also change, so as to generate the induced electromotive force in winding around the core, and the electrical signal input ECU. Piezoelectric type knock sensor using the effect of piezoelectric crystal or ceramic polycrystals and work, but also the use of piezo resistance effect of the doped silicon. The sensor housing is provided with a piezoelectric element, counterweight block and wire etc.. Its working principle is: when the engine cylinder block vibration and vibration transmitted to the casing of the sensor, relative movement between the shell and the counterweight, variation of piezoelectric element is clamped in between the pressure occurs, resulting in voltage. ECU detects the voltage, and according to the size of its value judgment of knock intensity.

Tension sensor known as resistance strain sensor

Tension sensor known as resistance strain Cooling Temperature Sensor , part of the load cell series, is a physical signal into a measurable electrical output of the device , which uses two passes some tension power transmission , in its structure containing force-sensitive force transfer device and the two parts , the pressure sensitive device comprising a piezoelectric film , the piezoelectric sheet gasket, the latter comprising a substrate portion and the edge portion of the force transmission , characterized in that the two force transmitting portion are respectively fixed on both ends of , together with the working surface between the ends of the transverse clamping force-sensitive device , the side of the piezoelectric sheet gasket pressure in the central region of the piezoelectric film , the substrate portion is the other side of the piezoelectric sheet edge portion of the force transmission room and close the piezoelectric film, one of its purposes is to be made to replace the rod hook scales weighbridges . The actual working environment is essential for the correct selection of tension Coolant Temperature Sensor , it is not only related to the force sensor can work as well as its safety and service life , and even the whole scale reliability and security .

What is the working principle of the anti explosion sensor

For the use of sensors in flammable and explosive occasions, in order to avoid the occurrence of explosion, usually with explosion-proof requirements of the product. There are three main sensor explosion-proof methods, respectively, is to control the explosive gas explosion detonated, control limitations and control source. The working principle of the three methods do briefly introduce: 1, control and explosive gasThe working principle is the box body burst in a sealed compartment, with clean air or inert gas does not contain explosive gases, and keep the inside pressure is slightly higher than the tank pressure, the sensor is installed in the box. Representative for the positive pressure explosion-proof method Exp. 2, control the explosion limitThe working principle is according to Exd standard, Crank Position Sensors housing design for flameproof standard housing, according to the shell explosion-proof standard instrument design, according to the standard design, manufacture and assembly of severely all management process, in the attack the shell explosion not to excite the shell of gas explosion risk.
Isolation design and manufacture standard proof explosion-proof measures extremely severe, and operating procedures, and repair of the assembly connection is also very strict. Electrical equipment, the way of determining the flameproof instrument are very strict, the operation must be off, but many cases is the most useful method. 3, ignition control source principle is applied safety gate isolation wiring, processing from Cooling Temp Sensor is in electric power distribution, will supply the field sensor energy limited in both cannot occur enough to detonate the spark, and can safely confined to surface temperature rise within the instrument. According to the national standards of international norms and China, when the peace gate safe area at one side of the connecting device to attack any obstacle, essence safety explosion-proof measures to ensure that explosion risk on site safety need to remind you to consider in the purchase of Cooling Temperature Sensor for the use of different occasions and configuration, choose according to need the intrinsically safe type, flameproof type sensors and instrumentation also required, Ex explosion-proof certification from suppliers.

Capacitance weighing sensor's faults

No matter what the sensor has its own advantages and disadvantages, the weighing sensor is the same, it is mainly used to quality signals into electrical signals, the advantages of capacitance sensor is low power consumption, low cost, what are the disadvantages of it, we come to understand in detail. Disadvantages: high output impedance, low load capacity
Capacitance Cooling Temperature Sensor capacity by the electrode geometry restriction very difficult to do, generally tens to hundreds of micro method, even only a few micro method. Therefore, the output impedance capacitive weighing sensor is high, so the load capacity is poor, vulnerable to outside interference produced unstable phenomenon, serious and even unable to work. We must take shielding measures properly, to design and the use of inconvenience. Capacitance sensor also requires insulation resistance value is extremely high, otherwise the insulation performance of part as bypass resistance and affect the instrument, so we should also pay special attention to the surrounding environment such as temperature, cleanliness, etc.. If the use of high frequency power supply, can reduce the output capacitance weighing sensor resistance, but the high frequency amplifier, sensor than low frequency complex, and the effect of parasitic capacitance, is not easy to ensure the stability of the work. Two shortcomings: the output characteristics of output characteristics of nonlinear capacitance weighing sensor is nonlinear, although the use of differential type to improve, but can not be completely eliminated.Engine Coolant Temperature Sensor for other types of only ignores the edge effect of electric field, the output characteristics is linear. Additional capacitance or the edge effect will be directly superimposed sensor capacitor, the output characteristics of nonlinear. Disadvantages: three parasitic capacitance effect of initial capacitor capacitance weighing sensor is small, and the lead capacitance, electronic circuit connected with the sensor and the electronic circuit of the stray capacitance and inside Coolant Temperature Sensor plate and the surrounding conductors capacitors and other so-called missing large parasitic capacitance, not only reduces the sensitivity of the sensor, and the capacitance is often random variation the instrument, work is not stable, influence the accuracy of measurement. So the cable selection, installation, connection method has strict requirements. For example, with good shielding property, its small distributed capacitance of high frequency electric wire as the lead, lead is thick and short, to ensure the instrument stray capacitance is small and stable and so on, otherwise it can not guarantee the high measurement precision. It should be pointed out that, along with the material, technology, electronic technology, especially the rapid development of technology, the capacitance weighing sensor has been developing and constantly overcome shortcomings. The capacitance sensor is becoming a high sensitivity, high precision, low pressure sensor in dynamic, and some special measurement has a promising.

How to choose the flow sensor

Flow sensor how to choose ? Information technology is a major force in the computer, communications technology, then there is a sensor , the sensor market promising, with advances in technology , increased levels of automation , our special attention to development of sensors . Test procedures and standards are flow sensor flow meter can accurately measure of protection. In many areas of the economy , the flow of accurate measurements have become very important , for example: environmental monitoring , health care , security , and trade settlement and so on. Why do you want to develop a Engine Temperature Sensor ? Now , product type flow sensor has been increasing, and almost every year there will be a number of new sensors for your choice . These sensors have their own economic and technical characteristics. Therefore, consumers should be generous to accept their presence , so you can successfully promote the great advances in technology . However, the new sensors are not necessarily mature technology , a lot of new products out of the technology was not mature enough , but not to promote technological progress, so that either improve them or let them social outcasts . Some flow sensor is not sufficient in many occasion in experiments conducted in the laboratory, but only some of the experiments on the market . In fact, these sensors , there are still many unknown factors, but does not have the national conditions of some of the technical regulations . Therefore, Positioning Sensor should be prohibited extensive promotion and application , otherwise , it brings the community is definitely a bad influence. According to the nature of the flow sensor standard classification , can be divided into the following categories . Method Standard : Engine Water Temperature Sensorcalculation method, detection methods , test methods and performance assessment methods, etc. ; basic standards : Some basic parameters of the sensor specifications , models, naming, and in the measurement process jargon ; product standard : it provides sensor technology requirements, acceptance of rules , test methods and product categories , in addition , there are proper installation and use requirements, etc. There are some standard that only the correct installation and use of technology, which is the product of the nature of the standard product applications .

Why do you want to develop a standard sensor

Why do you want to develop a standard sensor ?Now, the type of product flow sensor has been increasing, and almost every year there will be a number of new sensors for your choice . These sensors have their own economic and technical characteristics. Therefore, consumers should be generous to accept their presence , so you can successfully promote the great advances in technology . However, the new sensors are not necessarily mature technology , a lot of new products out of the technology was not mature enough , but not to promote technological progress, so that either improve them or let them social outcasts . Some flow sensor is not sufficient in many occasion in experiments conducted in the laboratory, but only some of the experiments on the market . In fact, Crankshaft Positioning Sensor , there are still many unknown factors, but does not have the national conditions of some of the technical regulations . Therefore, such sensors should be prohibited extensive promotion and application , otherwise , it brings the community is definitely a bad influence. According to the nature of Crankshaft Sensors standard classification , can be divided into the following categories . Method Standard : Some Camshaft Position Sensor calculation method, detection methods , test methods and performance assessment methods, etc. ; basic standards : Some basic parameters of the sensor specifications , models, naming, and in the measurement process jargon ; product standard : it provides sensor technology requirements, acceptance of rules , test methods and product categories , in addition , there are proper installation and use requirements, etc. There are some standard that only the correct installation and use of technology, which is the product of the nature of the standard product applications .

Speed ​​sensor is a sensor measuring the speed of the object

Speed ​​sensor is to measure the speed of an object 's sensor, which is very useful in the field of robotics , incremental displacement per unit time is speed . Including line speed and angular speed , corresponding to the wire speed sensor and an angular velocity sensor , we are collectively referred to as the speed sensor. Digital speed sensor performance are: ( 1 ) number of pulses and resolution. Digital speed sensor output is a pulse signal , the number of output pulses per revolution Shaft Position Sensor resolution. ( 2 ) frequency modulation. Constant when the sensor is rotated, the frequency modulation is offset relative to the center frequency swing . ( 3 ) frequency response. Sensor output pulses are frequency dependent , above a certain frequency response , the sensor output pulse waveform deterioration , the error is too large, the sensor malfunction . Typically , the maximum frequency response of Engine Water Temperature Sensor is large, can meet the requirements. ( 4 ) the moment of inertia . Moment of inertia of Coolant Temperature Sensor dynamic characteristics of the system have a greater impact, and starting the drive motor directly affects the output of the sensor , therefore , the rotational inertia of the sensor should meet the dynamic requirements of the drive system .

The performance of all kinds of different digital sensors , should be based on different applications

The performance of all kinds of different digital sensors , should be based on different applications , use of different digital speed sensors. Several major applications are presented . 1 , analog DC motor speed control DC motor speed control analog feedback with analog voltage and frequency in two ways. The former DC tachometer generator as a Engine Coolant Sensor , because the DC tachometer generator inherent defect, so that people consider using other types of speed sensor as a speed feedback . Wherein the speed feedback element is a magnetic sensor via digital speed F / V conversion , and filtered into a DC level back to the comparing circuit for controlling the rotational speed . The speed control method is not only simple , reliable, and low cost.
2, the DC motor incremental motion control with high precision for complex control applications requires the use of incremental motion control methods to meet system requirements. Incremental motion control only controls the speed of movement , but also for positioning control and frequent starts and stops acceleration and deceleration control . The speed feedback system with digital Coolant Temperature Sensor output digital signal that can achieve these various control requirements. Incremental movement of the DC motor speed control system in the encoder sensor digital Camshaft Position Sensor. Speed ​​digital speed sensor output signal is fed to the comparison circuit and a regulating circuit , to meet the fast high-precision servo control, and requirements for wide speed control , which is often used in modern incremental movement speed feedback method . 3, the phase lock servo motor speed control system is controlled by the speed feedback to regulate due to mechanical loads or changes in the environment caused by such speed deviation . This method of control is to regulate the nature of the case of a difference , speed accuracy is not high, although the number may be used to improve the accuracy of incremental control , but still can not meet the high precision speed control requirements. The lock-in technique for speed control , can achieve synchronous motor control is achieved without droop . Lock-in technique to compose for servo controlling the phase lock servo control system, which phase lock loop is determined by the reference frequency generator , an encoder , a phase frequency comparator , a low pass filter, amplifier and DC motors and other components.

Contact type temperature sensor and the measured object detecting portion has a good touch , also known as a thermometer

In recent years, the continuous development of science and technology , China's science and technology into the automation, digitization of the new field , which is used to place the temperature sensor a lot more . With the low-temperature technology in the defense engineering , space technology, metallurgy, electronics, food , pharmaceutical and petrochemical sectors and the wide application of superconducting technology research, measuring temperatures below 120K cryogenic thermometers have been developed , such as low temperature gas thermometer , steam pressure thermometer, acoustic thermometer, paramagnetic salt thermometer , quantum thermometer , low thermal resistance and low-temperature thermocouple and so on. Low temperature thermometer temperature sensing element requires small size , high accuracy , repeatability and stability. Porous silica glass using carburizing carburizing sintered glass thermal resistance thermometer is a temperature sensing element , for measuring the range of 1.6 ~ 300K temperature. Conductors of two different materials , such as connected to each other at a certain point , the connection point of heating in their unheated parts of the potential difference occurs . Pressure switch the value of this potential difference is not heated and the temperature of the parts of the measuring point , and the material on the two conductors . This phenomenon can be in a wide temperature range occurs , if the potential difference accurately measure , measure the unheated parts of the ambient temperature , heat spots can accurately know the temperature. Since it must have two conductors of different materials , so called " thermocouple ." Thermocouples made ​​of different materials used in different temperature ranges , they are also different sensitivity . The sensitivity of the thermocouple hot spot temperature is added 1 ℃ , the output variation of the potential difference . For most metal thermocouples supporting material is concerned, this value is about 5 to 40 microvolts / ℃ between . Crankshaft Positioning Sensor has its own advantages and disadvantages , which sensitivity is relatively low, the interference signal susceptible to environmental impact, but also susceptible to temperature drift of the preamplifier , therefore not suitable for measuring small changes in temperature. Since the thermocouple temperature sensor independent of the thickness of the material sensitivity , a very thin material can be made ​​of a temperature sensor . Also due to the production of metal thermocouple material has good ductility , this subtle temperature measuring element has a high response rate, can be measured rapidly changing process . Temperature sensor is a wide variety of the most commonly used variety of Cooling Temperature Sensor as a modern form of the temperature sensor was very small, so it is more widely used in various fields of production practices , but also for our life to provide a myriad of convenience and functionality . There are four main types of temperature sensors : thermocouples , thermistors , resistance temperature detector (RTD) and IC temperature sensor. IC temperature sensor also includes analog and digital outputs of two types. Contact type temperature sensor and the measured object detecting portion has a good touch , also known as a thermometer .

Summary of metal thermal resistance sensor applications

Thermal resistance meter is a metal thermal resistance typical applications of the sensor . RTD juice flow is based on the physics inside the medium made ​​of heat conduction phenomena . If the temperature T1 of the thermal resistance at temperature T2 into the medium , provided the thermal resistance in contact with the medium surface area A, the thermal resistance of the heat dissipation Q can be expressed in: Q = KA (T1-T2), formula , K is the thermal conductivity , or heat transfer coefficient . Experiments show that , K and medium density , viscosity, average flow rate parameters. When other parameters are constant , K- only medium is proportional to the average velocity . By measuring the thermal resistance of the heat dissipation Q can be measured the average velocity or flow medium . Thermistor sensor has a small size, fast response, high sensitivity , so it is widely used in many fields . Camshaft Position Sensor in industrial applications is very wide, depending on the product model, its scope is also not the same line , specifically the following aspects: Thermistor Temperature : As a thermistor temperature measurement sensors are generally relatively simple structure , the price cheaper . No outside protective layer thermistor can only be applied in a dry place ; sealed thermistor afraid of moisture erosion, can be used in a relatively harsh environment . Since the resistance of the thermistor sensor is large, so the connecting wires and the contact resistance of the resistance can be ignored , so Engine Coolant Temperature Sensor at the temperature up to several kilometers of distance measurement applications, multi-use bridge measurement circuit . The principle can also be used as the use of other temperature measurement and control circuit. Thermistor for temperature compensation of the sensor : ThermistorShaft Position Sensor in a certain range to compensate for certain components humidity . For example, moving coil meter moving coil header by the copper wire around the system . Temperature increases , the resistance increases, causing the temperature errors. And can therefore be of the moving coil circuit will be negative temperature coefficient thermistor manganese copper and then with the resistor in parallel with the series compensation components , in which to offset the error caused by temperature changes . In the transistor circuit , logarithmic amplifier , it is also composed of a thermistor compensation circuit used . Compensation due to temperature drift errors . Thermistor sensor overheat protection: thermal protection of direct indirect protection to protect profits . The small current case, the thermistor sensor can directly load string person , to protect the device to prevent overheating damage , for large current applications , can be used for the relay , transistor circuit protection. In either case, the thermal resistance of the device to be protected are close together , so that heat exchange between the full , the event of overheating , the protective effect of the thermistor . For example , the stator winding of the motor thermistor embedded in the mutant and in series with the relay . When the motor is overloaded, the stator current increases , causing fever . When the temperature is higher than point mutations , the current in the circuit can be within a few tens of milliamperes is mutated to tens of milliamps , the relay, in order to achieve thermal protection. Thermistor sensor for liquid level measurement : NTC thermistor sensor to put some heating current , its surface temperature will be higher than the surrounding air temperature, at which point it 's less resistance . When the liquid and higher than its installation height, it would take away the heat of the liquid , so the temperature drops , the resistance increased. Determine its resistance changes , you can know whether the liquid level is below the set value . Oil level in the tank car Automotive Temperature Sensors is produced using the above principle . Thermistor in the car is also used to measure the oil , the cooling water mixed with other .

Rocket technology sensor applications

Rocket launch is like a dragon is never caught not come, in fact, on the rocket in order to ensure safe flight of astronauts to provide accurate input data , the rocket on the various types of sensors , converters play an important role in sensor in the end what kind of role play it , and today China sensors trading network came to tell you about it. Various types of Automobile Temperature Sensor on the rocket , mostly installed inside the key parts of the rocket , they perceived the arrow on the physical changes responsible for the physical quantity conversion converter to achieve the transmission signal supplied to the control system of the rocket and ground control center as a basis to judge , like a change in both eyes fixed targets for the command center to provide a basis to predict . Speaking of rockets internal sensor , manifold variety. Working principle of a capacitive , resistive , optical type , indicators measured pressure, displacement , strain, physical monitoring the acceleration , position, temperature , noise, vibration , etc. aspects. Wide range of Camshaft Position Sensorin the rocket world, there are several categories is particularly important, it is a direct monitoring data reflect the status of the rocket is safe . Acceleration sensor lifesaving escape criterion for the rocket escape system provides important parameters , when the rocket a serious failure , endangering the safety of astronauts , it will show the acceleration deviation from the design value , the sensor will sense this change the first time , and issued signal initiates escape procedures to help astronauts quickly out of the woods . Using the system with level Automotive Temperature Sensors for measuring the remaining amount of propellant level measurement , real time, continuously , accurately provide information on the remaining amount of liquid propellant , controls the engine adjusting valve or open or closed , monitoring the flow of propellant mixing ratio of the engine keep tank oxidant , the mass ratio of the combustion agent is within the optimal range . Vibration and noise is the rocket invisible killer , though does not seem to explode so violently cruel, but the astronauts of the body is also very large destructive . In order to ensure the rocket during flight vibration and noise generated by the human body can not exceed acceptable levels , improve ride comfort of astronauts , rockets also set up a special monitoring vibration and noise of the sensor. Rumbling avalanche of orange flame , daring and took away all eyes , a small sensor on the huge rocket body seem insignificant , but they are protecting the safety of the astronauts unsung heroes in the thousands of degrees of broiled high stick to their posts , so vacated became an astronaut flying dragon tame car.