The principle and application of the pressure sensor

1, the diffusion silicon pressure sensor is introduced the working principle of the measured medium pressure direct effects on the sensor diaphragm ( Stainless steel or ceramic) , make diaphragm micro displacement is proportional to the medium pressure, the sensor's resistance to change, and use electronic circuit to detect the change, and the transformation output of a standard measurement signal corresponding to the pressure.

2, there are many types of strain gauge pressure sensor on mechanical sensor, such as resistance strain gauge pressure sensors, semiconductor strain gauge pressure sensors, piezoresistive pressure sensor, inductance type pressure sensors and capacitive pressure sensor, resonant pressure sensors and capacitive acceleration sensor and so on. But the most widely used is a piezoresistive pressure sensor, it has a very low price and high accuracy and good linear characteristic.

pressure sensor in the main use of piezoelectric material consists of quartz, sodium potassium tartrate and phosphate. Of silica is a kind of quartz is the crystal eye, piezoelectric effect is found in the crystal, within certain limits of temperature, the piezoelectric properties have always existed, but after the temperature exceeds the range, the piezoelectric properties completely disappear, The high temperature, that is, the Curie point) 。 Due to the changes with the change of pressure power plant small ( That is to say, the piezoelectric coefficient is low) So quartz gradually replaced by other piezoelectric crystal. And sodium potassium tartrate has great sensitivity and piezoelectric piezoelectric coefficient, but it can only be in the environment of the greenhouse and the humidity is low. Two melamine phosphate belongs to artificial crystal, able to bear high temperature and high humidity, so has been widely used.

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key words: thermal resistance, thermocouple, thermal resistance, platinum resistance, PT100, PT1000, pressure sensor and digital temperature sensor