传感器是将非电学物理量(如位移、速度、压力、温度、湿度、流量、声强、光照强度等)转化成易于测量、传输、处理的电学物理量(如电压、电流、电阻、电容等)的一种元件,即非电学物理量→传感器→电学量;他是感知、获取和检测信息的窗口,是自动控制设备中不可缺少的元件,自动控制系统获取的信息都要通过传感器将其转化为容易传输和处理的电信号。传感器根据其转换的信号来可分:力电传感器,热电传感器,光电传感器,根据其利用的元件可分为:电容式传感器、电阻式传感器等。电阻应变式传感器在检测中的得到广泛应用。 Sensors convert non-electrical physical quantities such as displacement, velocity, pressure, temperature, humidity, flow, sound intensity, light intensity, etc. into electrical physical quantities (such as voltage, current, resistance, capacitance, etc.) that are easy to measure, A component, that is, non-electrical physical quantity → sensor → electrical quantity; he is a window of perception, access and detection of information is an indispensable component of automatic control equipment, automatic control system to obtain the information through the sensor to convert it to easy Transmission and processing of electrical signals. Sensors can be divided according to their converted signals: force sensors, thermoelectric sensors, photoelectric sensors, according to the use of the components can be divided into: capacitive sensors, resistive sensors. Resistance strain sensor in the detection of widely used.