Devices that can measure pressure and provide remote electrical signals are collectively referred to as pressure sensors. The pressure sensor is an important part of the pressure detection instrument, and its structure is varied, the common types are strain type, piezoresistive type, capacitive type, piezoelectric type, vibration frequency pressure sensor and so on. In addition, there are photoelectric, optical fiber, ultrasonic pressure sensors and so on. The pressure sensor can directly convert the measured pressure into various forms of electrical signals, which is convenient to meet the requirements of centralized detection and control of the automation system, so it is widely used in industrial production.