1. According to the use of pressure and force sensor, position sensor, liquid level sensor, energy consumption sensor, speed sensor, acceleration sensor, ray radiation sensor, thermal sensor. 2. According to the principle of vibration sensor, humidity sensor, magnetic sensor, gas sensor, vacuum sensor, biosensor, etc. 3. Simulate the sensor according to the output signal: convert the measured non-electrical quantity into an analog electrical signal. Digital sensor: Converts the measured non-electrical quantity into a digital output signal (including direct and indirect conversion). Pseudo digital sensor: The output of the measured semaphore into a frequency signal or a short-period signal (including direct or indirect conversion). Switch sensor: When a measured signal reaches a certain threshold, the sensor outputs a set low or high level signal accordingly. 4. According to its manufacturing process The integrated sensor is manufactured using standard process technology for the production of silicon-based semiconductor integrated circuits. Typically, part of the circuit used for the initial processing of the signal under test is also integrated on the same chip. Thin film sensors are formed by depositing a thin film of the corresponding sensitive material on a dielectric substrate (substrate). When the hybrid process is used, part of the circuit can also be manufactured on this substrate. The thick film sensor is made of a slurry of the corresponding material coated on a ceramic substrate, which is usually made of Al2O3, and then heat treated to form the thick film. Ceramic sensors are produced by standard ceramic processes or some variant of them (sol, gel, etc.). After the appropriate preparatory operation is completed, the formed components are sintered at high temperatures. There are many common characteristics between the two processes of thick film and ceramic sensor, and in some respects, the thick film process can be considered as a variant of the ceramic process. Each process technology has its own advantages and disadvantages. Due to the low capital investment required for research, development and production, as well as the high stability of sensor parameters, the use of ceramic and thick film sensors is more reasonable. 5. According to the measurement object, the physical sensor is made by using the characteristics of significant changes in some physical properties of the substance being measured. Chemical sensors are made of sensitive elements that can convert chemical quantities such as composition and concentration of chemical substances into electrical quantities. Biosensors are sensors that use the characteristics of various organisms or biological substances to detect and identify chemical components in organisms. 6. According to its composition, the basic type sensor: it is the most basic single conversion device. Combined sensor: It is a sensor composed of different individual conversion devices. Application sensor: It is a sensor composed of a basic sensor or a combined sensor and other mechanisms. 7. According to the form of action, it can be divided into active and passive sensors. The active sensor has an action type and a reaction type, which can emit a certain detection signal to the tested object, and can detect the change of the detection signal in the tested object, or the signal is formed by the detection signal in the tested object. The mode of detecting the change of the detection signal is called the action type, and the mode of detecting the response and forming the signal is called the reaction type. Radar and radio frequency range detectors are examples of action, while photoacoustic effect analysis devices and laser analyzers are examples of reaction. Passive sensors only receive signals generated by the measured object itself, such as infrared radiation thermometers and infrared camera devices.
Sensor technology is equivalent to the \"ear\" of the Internet of Things, which is mainly responsible for accepting the \"sound\" of objects and the environment. Sensors are divided into pressure sensitive and force sensitive sensors, position sensors, liquid level sensors, energy consumption sensors, speed sensors, acceleration sensors, ray radiation sensors, thermal sensors, etc.
Pressure sensor - Temperature and humidity sensor - temperature sensor - flow sensor - liquid level sensor - ultrasonic sensor - immersion sensor - illumination sensor - differential pressure transmitter - acceleration sensor - displacement sensor - weighing sensor