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What kinds of sensors are there, please?
The sensor is a detection device, can feel the measured information, and can feel the information, according to the law must transform into electrical signals or other information in the form of output required to meet the information transmission, processing, storage, display, record and control requirements, including the characteristics of the sensor. Miniaturization, digitization, intelligent, multi-functional, system and network, it is the most important link for realizing automatic detection and automatic control of the existence and development of the sensor, makes the object a sense of touch, taste and smell and other senses, let the body slowly become alive. The following virtuous collection network explains the classification of the sensors, the main functions, the principle of selection, the composition and the principle of the work.
Classification of sensors
There are many classifications of sensors, but there are two commonly used classification methods, one is the physical quantity according to the measured amount, and the other is based on the sensor's working principle. The sensors which are divided according to the measured physical quantities include: temperature sensor, humidity sensor, pressure sensor, displacement sensor, flow sensor, liquid level sensor, force sensor, acceleration sensor, torque sensor and so on.
1. Electrical sensors
Electrical sensor is a widely applied sensor in non electrical measurement technology. There are commonly used sensors, such as resistive sensors, capacitive sensors, inductive sensors, magnetoelectric sensors and eddy current sensors.
2. Magnetic sensor
The magnetic sensor is made by some physical effect of ferromagnetic material, mainly used for displacement, torque and other parameters is based on the piezoresistive effect, semiconductor photoelectric effect, magnetoelectric effect, semiconductor in contact with the gas generating material change principle, measurement is mainly used for temperature and humidity, pressure, acceleration, magnetic field and harmful gas.
3. Photoelectric sensor
Photoelectric sensor occupies an important position in the technology of electric measurement and automatic control. It is made of photoelectric effect and optical principle of optoelectronic devices. It is mainly used to measure the parameters of light intensity, light flux, displacement, and concentration.
4. Electric potential sensor
The electric potential sensor is made by the principle of thermoelectric effect, photoelectric effect and Holzer effect. It is mainly used for the measurement of temperature, magnetic flux, current, speed, light intensity and thermal radiation.
5. Charge sensor
The charge sensor is made of the principle of piezoelectric effect, which is mainly used for the measurement of force and acceleration.
6, semiconductor sensor
Semiconductor sensors are made by the principles of semiconductor piezoresistive effect, internal photoelectric effect, magnetoelectric effect, semiconductor and gas contact, and so on. They are mainly used for measuring temperature, humidity, pressure, acceleration, magnetic field and harmful gas.
7, resonant sensor
A resonant sensor is made by changing the intrinsic parameters of electricity or machinery to change the resonant frequency. It is mainly used to measure the pressure.
8. Electrochemical sensor
Electrochemical sensors are made on the basis of ionic conductivity. According to their different electrical properties, electrochemical sensors can be divided into potential sensors, conductive sensors, electric sensors, polarographic sensors and electrolytic sensors. Electrochemical sensors are mainly used for the analysis of gases, liquids or solid components dissolved in liquids, the pH, conductivity and redox potential of liquids.