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前言超声波传感元件在医疗诊断和工业设备领域被广泛应用。特别是在无损检测方面,超声波探测法检测灵敏度高、适用范围广,所以应用最普遍。在这种采用超声波的设备中,超声波的产生及检测手段,大部分是使用压电元件。对于利用压电元件的超声波收发信法(电致伸缩法)来说,为了把超声波传递给被检测材料,在超声波收发信元件和被检测物之间必须通过水、油等接触媒质产生声的耦合。这样极大地限制了它的使用和
Foreword Ultrasonic sensor components are widely used in medical diagnostics and industrial equipment. Especially in non-destructive testing, ultrasonic detection detection sensitivity, wide range of applications, so the most common application. In this kind of equipment that uses the ultrasonic wave, the ultrasonic wave is produced and examined mostly, mostly use the piezoelectric element. In the ultrasonic transmission / reception method (electrostrictive method) using a piezoelectric element, in order to transmit the ultrasonic wave to the material to be detected, it is necessary to generate an acoustic wave between the ultrasonic wave transceiver element and the object under test by a contact medium such as water and oil coupling. This greatly limits its use and