一种可提高压电复合材料d_(33)和d_h值的新型结构传感器

A sensor with new construction for raising d_(33) and d_h of the piezoelectric composite material

原理分析和实验结果证明了：通过一种含有空腔的金属电极与压电复合材料的界面作用，改变了应力的作用方式。提高了山。值（从12．0—27．SPC／N提高到33．6—106PC／N）；并使数值符号相反的山。和d31均对dh值起加大作用，从而dh值可由复合材料的小于27pC／N提高到41pC／N以上，这种新型结构可显著提高压电复合材料力敏器件的灵敏度和机械强度，使之有望在水声等诸多领域广泛应用。

A principle analysis and experiments have proved that using the interfacial action between a metal electrode with cavity and a piezoelectric composite film can change the action of the stress, raise the value of d33 from (12.o--27.8pC/N) to (33.6-106pC/N), make d33 and d31 with opposite signs to add up in their contributions to dh 3 which can thus be raised from < 27pC/N to > 41pC/N. The new construction increases the piezoelectric sensitivity and the mechanical strength of the piezoelectric composite film as a force sensing element and can be expected to be applied widely in underwateracoustics, electroacoustics,etc.