SENSOR-5 common pressure sensor working principle introduction

The most commonly used one of the pressure sensors is a kind of application in the fields of industry, electronics, chemical industry, medical, military, petroleum and so on. There are many types of pressure sensors, which can be divided into piezoresistive pressure sensors, ceramic pressure sensors, diffused silicon pressure sensors, etc. Today, Xiaobian will introduce the working principle of common pressure sensors for everyone, hope to help everyone.

1. Piezoresistive force sensor:
The strain gauge is one of the main components of the piezoresistive strain sensor. The working principle of the metal resistance strain gauge is a phenomenon in which the strain resistance adsorbed on the base material changes with the mechanical deformation, which is commonly called the resistance strain effect.

2, ceramic pressure sensor:
The ceramic pressure sensor is based on the piezoresistive effect. The pressure acts directly on the front surface of the ceramic diaphragm to cause a slight deformation of the diaphragm. The thick film resistor is printed on the back side of the ceramic diaphragm and connected into a Wheatstone bridge due to the varistor. The piezoresistive effect causes the bridge to generate a highly linear voltage signal proportional to the pressure, which is proportional to the excitation voltage. The standard signal is calibrated to 2.0/3.0/3.3mv/v depending on the pressure range. The strain gauge sensor is compatible.

3. Diffused silicon pressure sensor:
The working principle of the diffused silicon pressure sensor is also based on the piezoresistive effect. Using the principle of piezoresistive effect, the pressure of the measured medium acts directly on the diaphragm of the sensor (stainless steel or ceramic), so that the diaphragm produces a micro-displacement proportional to the pressure of the medium. The resistance value of the sensor is changed, the change is detected by an electronic circuit, and a standard measurement signal corresponding to the pressure is converted and output.

4, sapphire pressure sensor:
Using strain-resistive operation, silicon-sapphire is used as a semiconductor sensor with unparalleled metrology. Therefore, semiconductor sensitive components made of silicon-sapphire are insensitive to temperature changes, and have excellent operating characteristics even under high temperature conditions; sapphire has strong radiation resistance; in addition, silicon-sapphire semiconductor sensitive components, Pn drift.

5. Piezoelectric pressure sensor: The piezoelectric effect is the main working principle of the piezoelectric sensor. The piezoelectric sensor cannot be used for static measurement, because the electric charge after external force is saved only when the loop has an infinite input impedance. . This is not the case, so this determines that the piezoelectric sensor can only measure dynamic stresses.