背衬对埋入混凝土中压电陶瓷激励声能的影响

压电埋入式混凝土敏感模块是利用在混凝土中埋入的压电陶瓷形成的一种复合式智能单元.该敏感模块可以对混凝土结构的健康状况进行检测.为了提高埋入混凝土中的压电陶瓷所激励声能的效率从而提高检测的准确性,提出了一种在压电陶瓷圆片一侧用硅橡胶层和金属背衬的方法,该方法能将压电陶瓷双侧的声能集中到一侧从而充分利用声信号能量提高声激励...

Backing for the influence of the energy of acoustic signal of the piezoelectric sensor embedded in concrete

piezoelectric embedded concrete module is a combination of the piezoelectric materials and the concrete. Such module can be used to monitor the health of the concrete structure. In order to enhance the acoustic signal created by the embedded piezoelectric materials, this paper used metal backings combined with the embedded piezoelectric ceramic disc. This method allows the receiver on the axial direction of the embedded piezoelectric ceramic discs received acoustic signal with 10 times more energy. We got a characteristic curve of the energy of the relative increment of acoustic signal changes as the product of backing thickness and acoustic excitation frequency. The power spectrum of acoustic signal analysis also showed that the metal backing does not change the peak frequency and frequency bandwidth range of the acoustic signal power spectrum.