Do you know the types of pressure sensors?

　　Piezoresistive pressure sensor

　　Piezoresistive pressure sensor is a type of sensor based on the variation of resistance value with pressure. In such sensors, elastic elements (such as metal films or wires) will deform with the pressure applied to them, thereby changing the resistance value. Piezoresistive sensors have the advantages of simplicity and low cost, making them suitable for applications that require lower precision, such as pressure switches in household appliances.

　　Capacitive pressure sensor

　　The capacitive pressure sensor utilizes the principle that the distance between the two plates of a capacitor is slightly changed due to external forces. When external forces act on the sensor, the distance between the two plates of the capacitor will change slightly, thereby changing the capacitance value. The advantages of this sensor are high sensitivity and good linearity, making it suitable for applications with high precision requirements, such as automotive engine control systems and medical equipment.

　　Piezoelectric pressure sensor

　　Piezoelectric pressure sensors utilize the piezoelectric effect, which is the phenomenon where a substance generates an electric charge when subjected to mechanical compression. This type of sensor is usually composed of piezoelectric crystals, which generate charges when subjected to pressure, thereby achieving pressure measurement. Piezoelectric pressure sensors have the characteristics of high sensitivity, high frequency response, and stability, making them suitable for applications that require high precision and fast response, such as in the aerospace and scientific research fields.

　　Liquid static pressure sensor

　　Liquid static pressure sensor is a sensor that uses the principle of liquid pressure transmission to measure pressure. The basic principle is to transfer the measured pressure through the liquid to the sensitive components inside the sensor (such as the pressure sensor chip), thereby achieving pressure measurement. This type of sensor is suitable for situations where liquid pressure needs to be measured, such as water pressure monitoring systems, liquid flow control systems, etc.

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