How the pressure sensor works

1. Piezoresistive pressure sensor. Resistance strain gauge is one of the main components of piezoresistive strain sensor. The working principle of the metal resistance strain gauge is that the strain resistance adsorbed on the base material changes with mechanical deformation, which is usually called the resistance strain effect.

2. Ceramic pressure sensor. The ceramic pressure sensor is based on the piezoresistive effect, where the pressure directly acts on the front surface of the ceramic film, causing the film to deform slightly. The thick film resistor is printed on the back of the ceramic film and connected to form a Wheatstone bridge. Due to the piezoresistive effect of the varistor, the bridge produces a high linearity proportional to the pressure. The voltage signal is also proportional to the excitation voltage. The standard signal is calibrated to 2.0/3.0/3.3mV/V according to the pressure range and is compatible with strain sensors.

3. Diffused silicon pressure sensor: The working principle of the diffused silicon pressure sensor is also based on the resistance effect. Using the principle of resistance effect, the pressure of the measured medium directly acts on the sensor film (stainless steel or ceramic), so that the film generates a micro displacement proportional to the pressure of the medium, changes the resistance value of the sensor, detects the change with an electronic line, and converts the standard measurement signal of the corresponding pressure.

4. Sapphire pressure sensor: The working principle of strain resistance, silicon sapphire as a semiconductor sensitive element, with unparalleled measurement characteristics. Therefore, the semiconductor sensitive element made of silicon sapphire is not sensitive to temperature changes and has good working characteristics even under high temperature conditions. Sapphire has strong anti-radiation properties; In addition, the silicon sapphire semiconductor sensor has no p-n drift.

5. Piezoelectric pressure sensor: Piezoelectric effect is the main working principle of piezoelectric sensor. Piezoelectric sensors cannot be used for static measurements because the charge after external force can only be preserved when the circuit has infinite input impedance. This is not the case in practice, so piezoelectric sensors can only measure dynamic stresses. Application: Pressure sensor is mainly used in: booster cylinder, supercharger, gas-liquid booster cylinder, gas-liquid supercharger, press, compressor, air conditioning refrigeration equipment and other fields.