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The pressure sensor belongs to a more commonly used pressure sensor, in industry, electronics, chemical, medical, military, petroleum and other fields have certain applications. There are many kinds of pressure sensors, which can be divided into piezoresistive pressure sensors, ceramic pressure sensors, diffusion silicon pressure sensors and so on. Today, Xiaobian will introduce the working principle of common pressure sensors for you, hoping to help you.

1, piezoresistive force sensor: resistance strain gauge is one of the main components of piezoresistive strain sensor. The working principle of metal resistance strain gauge is 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 membrane, connected into a wheatstone bridge, due to the piezoresistive effect of pressure-sensitive resistance, make the bridge produces a is proportional to the pressure of the highly linear, and the excitation voltage is proportional to the voltage signal, The standard signal is calibrated to 2.0/3.0/3.3mv/v according to the different pressure range, which can be compatible with the strain sensor.

3, diffusion 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 convert to output a standard measurement signal corresponding to this pressure.

4, sapphire pressure sensor: the use of strain resistance working principle, using silicon - sapphire as a semiconductor sensitive element, with unparalleled metering characteristics. Therefore, the semiconductor sensor made of silicon and sapphire is not sensitive to temperature changes, and has good working characteristics even under high temperature conditions. 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 the action of external force, only in the loop with infinite input impedance can be saved. This is not the case, so the piezoelectric sensor can only measure dynamic stresses.