含金属芯压电纤维传感Lamb波方向性研究

摘要

Metal-core piezoelectric ceramic fiber (MPF) is a new type of piezoelectric ceramic device. The calculating principle of Lamb wave energy factor based on wavelet transform is introduced. MPF is used as sensor of Lamb wave. The directivity of MPF sensing Lamb wave is researched using amplitude and wavelet transform energy factor method respectively. Results show that MPF has high directivity to sense Lamb wave, the directivity characterized by wavelet transformation energy factor shows more clear in comparison with amplitude.%含金属芯压电纤维(MPF)是一种新型压电功能器件.阐述了基于小波变换的Lamb波能量因子计算原理,把MPF作为Lamb波传感器,分别采用幅值和小波变换能量因子的方法对MPF传感Lamb波的方向性进行了研究.研究结果表明:MPF对Lamb波的传感表现出很强的方向性.相比采用幅值表征的结果,采用能量因子进行传感方向性表征更能体现出MPF对Lamb波的方向性传感特性.