How Pressure Sensors Work

1. Piezoresistive pressure sensor

Resistance strain gauge is one of the main components of piezoresistive strain sensor.The working principle of metal resistance strain gauge is the phenomenon that the strain resistance adsorbed on the matrix material changes with mechanical deformation, which is commonly known as resistance strain effect.

2. Ceramic pressure sensor

Ceramic pressure sensor based on piezoresistive effect, directly in front of the ceramic membrane surface, make the diaphragm produces tiny deformation, thick film resistors printed on the back of the ceramic diaphragm, connected into a wheatstone bridge, as a result of the varistor piezoresistive effect, make the bridge produces a is proportional to the pressure of the highly linear, and the excitation voltage is proportional to the voltage signal and standard signal according to the different calibration of pressure range for 2.0/3.0/3.3 mV/V, etc., can be compatible and strain sensor.

3. Diffused silicon pressure sensor:

Diffusion silicon pressure sensor working principle is based on the piezoresistive effect, using the piezoresistive effect principle, the pressure of the measured medium directly effect on the sensor diaphragm (stainless steel or ceramic), make the diaphragm produces the micro displacement is proportional to the medium pressure, the sensor resistance change, use of electronic circuit to detect the change, and the transformation output of a standard measurement signal corresponding to the pressure.

4. Sapphire pressure sensor:

Based on the principle of strain resistance, silicon – sapphire is used as semiconductor sensitive element.Therefore, semiconductor sensitive elements made of silicon-sapphire are not sensitive to temperature changes. Even at high temperature, they also have good working characteristics.Sapphire has strong radiation resistance;In addition, silicon – sapphire semiconductor sensor, no p-n drift.

5. Piezoelectric pressure sensor:

Piezoelectric effect is the main working principle of piezoelectric sensor, piezoelectric sensor can not be used for static measurement, because the charge after external force action, only when the loop has infinite input impedance is preserved.This is not the case, so the piezoelectric sensor can only measure dynamic stress.

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