Working Principle of Pressure Sensor

1. Piezoresistive force sensor: The resistance strain gauge is one of the main components of a piezoresistive strain sensor. The working principle of the metal resistance strain gauge is the phenomenon that the strain resistance changes with mechanical deformation due to adsorption on the base material, which is commonly known as resistance strain effect.

2, Ceramic pressure sensor: ceramic pressure sensor based on the piezoresistive effect, the pressure directly on the front surface of the ceramic diaphragm, so that the diaphragm produces a slight deformation, thick film resistors printed on the back of the ceramic diaphragm, connected into a Wheatstone The bridge, due to the piezoresistive effect of the varistor, causes the bridge to generate a highly linear voltage proportional to the pressure and a voltage signal proportional to the excitation voltage. The standard signal is calibrated to 2.0/3.0/3.3mV depending on the pressure range. /V, etc., can be compatible with strain gauge sensors.

3, Diffusion silicon pressure sensor: diffusion silicon pressure sensor working principle is based on the piezoresistive effect, the use of piezoresistive effect principle, the pressure of the measured medium directly on the sensor diaphragm (stainless steel or ceramic), so that the diaphragm and the media Pressure is proportional to the micro-displacement, so that the resistance of the sensor changes, the use of electronic circuits to detect this change, and convert a standard measurement signal corresponding to this pressure.

4, Sapphire pressure sensor: the use of strain-resistance working principle, the use of silicon – sapphire as a semiconductor sensor, with unparalleled measurement characteristics. Therefore, silicon-sapphire semiconductor sensing devices are not sensitive to temperature changes, and have good operating characteristics even under high temperature conditions; sapphire has extremely strong radiation resistance characteristics; in addition, silicon-sapphire semiconductor sensing devices, no Pn drift.

5.Piezoelectric pressure sensor: Piezoelectric effect is the main working principle of piezoelectric sensor. Piezoelectric sensor cannot be used for static measurement, because the charge after external force is only saved when the circuit has infinite input impedance. . The actual situation is not like this, so this determines that the piezoelectric sensor can only measure the dynamic stress.

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