The principle of piezoelectric pressure sensor

Main use of piezoelectric materials in piezoelectric pressure sensor consists of quartz, sodium potassium tartrate and ammonium dihydrogen phosphate. The quartz ( Silicon dioxide) Is a kind of natural crystal, the 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 is called the Curie point) 。 Due to the changes as the change of stress field of tiny ( Also say, piezoelectric coefficient is low) , so is gradually replaced by other piezoelectric crystal quartz. And sodium potassium tartrate has great sensitivity and piezoelectric piezoelectric coefficient, but it can only be at room temperature and low humidity environment to the application.

pressure sensor are mainly offset error, error, linear error and hysteresis error sensitivity, reasonable for error compensation is the key to the application of pressure sensor

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