Main classification and selection principles of sensors 1

A sensor (English name: transducer/sensor) is a device used to detect and measure specific physical or chemical quantities, widely used in industrial automation, environmental monitoring, medical instruments, consumer electronics, and other fields. Sensors can be classified into various types according to different classification criteria, including functional principles, measured physical quantities, and sensor component materials.diode

1、 Classified by functional principle:

1. Resistance type sensor: detects signals based on changes in resistance, such as strain gauges, CD74AC138E thermistors, etc.

2. Capacitive sensors: use capacitance changes for signal detection, such as proximity switches, touch sensors, etc.diode

3. Inductive sensors: detect signals through induction phenomena, such as inductors, Hall elements, etc.diode

4. Photoelectric sensor: uses photoelectric effect for signal detection, such as photoelectric switches, photoelectric encoders, etc.