Principles and Applications of Piezoelectric pressure sensors

Mainly used in the piezoelectric transducer comprises a piezoelectric material are quartz, potassium sodium tartrate , and ammonium dihydrogen phosphate . Where quartz ( silicon dioxide) is a natural crystal , the piezoelectric effect is found in the crystal , and in a certain temperature range, the piezoelectric properties have been present,Engine Coolant Temperature Sensor temperature exceeds this range , the piezoelectric properties completely disappearance ( this temperature is called the " Curie point" ) . As with slight changes in stress field change ( it said piezoelectric coefficient is relatively low ) , so the quartz piezoelectric crystals gradually being replaced by another . The piezoelectric potassium sodium tartrate has great sensitivity and the piezoelectric coefficients , but it is only at a relatively low temperature and humidity environment, it can be applied . Ammonium dihydrogen phosphate crystals are artificial , can withstand high temperatures and high humidity , so has been widely used. Are also used in the polycrystalline piezoelectric effect , the piezoelectric ceramic such as the present , including barium titanate piezoelectric ceramic , PZT, niobate -based piezoelectric ceramics , lead magnesium niobate piezoelectric ceramic and so on.