Department of Materials Science and Engineering, University of California, Los Angeles, CA 90095, USA.
Department of Mechanical Engineering, Aoyama Gakuin University, Sagamihara 252-5258, Japan.
Sensors (Basel). 2021 Jun 27;21(13):4396. doi: 10.3390/s21134396.
In all ultrasonic material evaluation methods, transducers and sensors play a key role of mechanoelectrical conversion. Their transduction characteristics must be known quantitatively in designing and implementing successful structural health monitoring (SHM) systems. Yet, their calibration and verification have lagged behind most other aspects of SHM system development. This study aims to extend recent advances in quantifying the transmission and receiving sensitivities to normally incident longitudinal waves of ultrasonic transducers and acoustic emission sensors. This paper covers extending the range of detection to lower frequencies, expanding to areal and multiple sensing methods and examining transducer loading effects. Using the refined transmission characteristics, the receiving sensitivities of transducers and sensors were reexamined under the conditions representing their actual usage. Results confirm that the interfacial wave transmission is governed by wave propagation theory and that the receiving sensitivity of resonant acoustic emission sensors peaks at antiresonance.
在所有超声材料评估方法中，换能器和传感器在机电转换中起着关键作用。在设计和实施成功的结构健康监测 (SHM) 系统时，必须定量了解它们的换能特性。然而，它们的校准和验证已经落后于 SHM 系统开发的大多数其他方面。本研究旨在扩展最近在量化超声换能器和声发射传感器对法向入射纵波的传输和接收灵敏度方面的进展。本文涵盖了将检测范围扩展到更低的频率，扩展到面状和多种传感方法，并研究了换能器加载效应。利用改进后的传输特性，在代表实际使用情况的条件下重新检查了换能器和传感器的接收灵敏度。结果证实，界面波的传输受波动传播理论的控制，而共振声发射传感器的接收灵敏度在反共振处达到峰值。
