传感器是一种检测装置，能感受到被测量的信息，并能将检测感受到的信息，按一定规律变换成为电信号或其他所需形式的信息输出，以满足信息的传输、处理、存储、Show, record and control requirements.It is the primary part of automatic detection and automatic control.The sensor is usually composed of sensitive elements and conversion elements. The existence and development of the sensor allows the object to have sensory such as touch, taste and smell, and make the object slowly survive.
Sensor Technology
I. Technical features of sensor 1. The Chinese sensor industry is at a critical stage from the development of traditional types to new sensors. It reflects the general trend of new sensors to miniature, multifunctional, digital, intelligent, systematic, and networked development.EssenceSensor technology has gone through many years of development. The development of its technology can be roughly divided into three generations: the first generation is a structural sensor, which uses the changes in structural parameters to feel and transform signal.The second generation is a solid sensor developed in the 1970s. This sensor is composed of semiconductor, electronics, magnetic materials and other solid elements. It is made of certain characteristics of materials.Such as: using thermoelectric effects, Hall effects, and light sensitivity effects, they are made into thermocouple sensors, Hall sensors, and light sensors.The third -generation sensor is a smart sensor that has just developed in the future. It is a product of combining miniature computer technology and detection technology, making the sensor have certain artificial intelligence.
Sensor size
The size of the sensor is actually the area of ??the sensitive device, which includes CCD and CMOS here.The larger the area of ??the sensor device, the larger the CCD/CMOS area, the more photons captured, the better the sensitivity performance, and the higher the signal -to -noise ratio.The larger the sensor size, the larger the light sensing area, and the better the imaging effect.1/1.8 -inch 3 -megapixel camera effect is usually better than the 1/2.7 -inch 4 -megapixel camera (the latters light sensing area is only 55%of the former).The increase in sensor pixels of the same size is a good thing, but this will also cause the sensitivity area of ??a single pixel to shrink and the possibility of lack of exposure.Digital cameras with a large sensor size have a higher price.The size of the sensitivity device directly affects the size of the digital camera.Ultra -thin, ultra -light digital cameras are generally small in size, and the more professional digital cameras, the larger the sensor size.
sensor type
1. According to its purpose, the sensor can be classified as: pressure sensitivity and force sensitivity sensor, position sensor, liquid sensor, energy consumption sensor, speed sensor, thermist sensor, acceleration sensor, ray radiation sensor, vibration sensor, wet sensor, magnetic sensor, magnetismSensitors, sensitive sensors, vacuum sensors, biosensors, etc.信 2. Taking its output signal as a standard, the sensor can be divided into: analog sensor -converting the measured non -electrical quantity into an analog electrical signal.Digital sensors -convert the measured non -electrical quantity into digital output signals (including direct and indirect conversion).Digital sensor -convert the measured semaphore to the output of frequency signals or short cycle signals (including direct or indirect conversion).
Sensor principles and applications
1. The working principle provides a ± 15V power supply to the sensor. The crystal oscillator in the excitement circuit generates a 400Hz square wave. After the TDA2030 power amplifier, it generates AC excitement power supply.In the class coil, the obtained AC power supply obtains a DC power supply of ± 5V through the rectifier filter circuit on the axis. The power supply is the working power supply of the calculation amplifier AD822; the high -precision voltage voltage voltage power supply consisting of the benchmark power AD589 and the double op amp 822 generates ± 4.5Vs precision DC power supply, which is used as a power supply of a bridge and a working power supply for the amplifier and the V/F converter.When the elastic axis is twisted, the MV -level strain signal obtained by the strain bridge detection is enlarged into a strong signal of 1.5V ± 1V through the instrument AD620, and then transformed into a frequency signal through the V/F converter LM131.The rotating primary coil is transmitted to the static secondary coil, and then the frequency signal that is directly proportional to the elastic axis can be obtained through the signal processing circuit filtering and shaping on the shell.The secondary instrument or frequency meter display can also be directly sent to computer processing.Because the rotary transformer movement only has a gap between a few millimeters between the static ring, and the part of the sensor shaft is sealed inside the metal shell to form an effective shielding, so it has a strong anti-interference ability.

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