Sensor is a kind of detection device that can sense the measured information, and can convert the sensed information into electrical signals or other required forms of information output according to certain rules to meet the requirements of information transmission, processing, storage, display, recording and control. This is the first step to realize automatic detection and automatic control.

Sensors are classified as follows:

1. According to the purpose

Pressure and force sensors, position sensors, liquid level sensors, energy consumption sensors, speed sensors, acceleration sensors, radiation sensors, thermal sensors.

2. According to this principle

Vibration sensor, humidity sensor, magnetic sensor, gas sensor, vacuum sensor, biosensor, etc.

3. Press the output signal

Analog sensor: converts the measured non-electric quantity into analog electric signal.

Digital sensor: converts the measured non-electric quantity into a digital output signal.

Pseudo-digital sensor: converts the measured signal amount into a frequency signal or a short-period signal for output.

Switch sensor: When the measured signal reaches a certain threshold, the sensor outputs a set low-level or high-level signal accordingly.

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