| 2. | Also , for material showing pyroelectric properties , electric charges will appear under the effect of temperature . according to these proprieties , a piezoelectric element is an electromechanical transducer ( energy converter ) . at present , most of the piezoelectric material is film or ceramic cylinder 聚偏氟乙烯( pvdf )作为一种压电材料,具有很强的压电效应和热释电效应,也是目前在压电高分子材料中研究的较为系统、应用最广泛的高聚物。 |