Application fields of pressure sensors
Pressure sensor is one of the most common sensors in industrial practice, and the pressure sensors we usually use are mainly made of piezoelectric effect. Such sensors are also called piezoelectric sensors. We know that the crystals are anisotropic and the crystals are isotropic. Some crystals of medium, when along a certain direction by mechanical force deformation, produces polarization effect; when the mechanical force is removed, will return to the neutral state, when it is under pressure, some crystals may produce electricity effect, this is the so-called polarization effect. Scientists have developed a pressure sensor based on this effect. Piezoelectric materials mainly used in piezoelectric sensors include quartz, potassium tartrate, sodium salt and phosphoric acid two hydrogen amine. The quartz (silica) is a kind of natural crystal, piezoelectric effect in the crystal is found in, in a certain temperature range, the piezoelectric properties has always been there, but after the temperature exceeds this range, the piezoelectric properties disappear completely (the high temperature is the so-called "Curie point").
