It takes advantage of piezoelectricity effect,so it also called piezoelectricity sensor.This piezoelectricity effect elements is used in muti-crystal, like piezoelectricity ceramic,including PZT etc.

• 在现在压电效应也应用在多晶体上，比如现在的压电陶瓷，包括钛酸钡压电陶瓷、铌酸盐系压电陶瓷、铌镁酸铅压电陶瓷等等。