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Characterization and optimization of an ultrasonic piezo-optical ring sensor

机译：超声压电环形传感器的特性与优化

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摘要

A resonant piezo-optical ring sensor with both piezoelectric and fiber Bragg grating (FBG) sensing elements was assessed for ultrasonic wave detection. The ring sensor is an existing device that has been shown experimentally to exhibit a number of sensing features: omnidirectionality, mode selectivity, and frequency tunability. The present study uses finite element modeling to understand these features as a means to characterize and optimize the sensor. A combined vibration-wave propagation modeling approach was used, where the vibrational modeling provided a basis for understanding sensing features, and the wave propagation modeling provided predictive power for sensor performance. The sensor features corresponded to the fundamental vibrational mode of the sensor, particularly to the base motion of this mode. The vibrational modeling was also used to guide sensor optimization, with an emphasis on the FBG and piezoelectric sensing elements. It was found that sensor symmetry and nodes of extraneous resonance modes could be exploited to provide a single-resonance response. A series of pitch-catch guided wave experiments were performed on a thin aluminum plate to assess the optimized sensor configuration. Tuning curves showed a single-frequency response to a Lamb wave and mechanical filtering away from the dominant frequency; the sensor capability for mechanical amplification of a Lamb wave and mechanical amplification of a pencil-lead-break acoustic emission event were also demonstrated.
机译：评估了具有压电和光纤布拉格光栅（FBG）感应元件的共振压电环形传感器，用于超声波检测。环形传感器是现有设备，已通过实验证明具有多种传感功能：全向性，模式选择性和频率可调性。本研究使用有限元建模来理解这些功能，以表征和优化传感器。使用了组合的振动波传播建模方法，其中振动建模为理解传感特征提供了基础，而波传播建模则为传感器性能提供了预测能力。传感器特征对应于传感器的基本振动模式，特别是该模式的基本运动。振动建模还用于指导传感器优化，重点是FBG和压电传感元件。发现可以利用传感器的对称性和外部谐振模式的节点来提供单谐振响应。在一块薄铝板上进行了一系列俯仰捕捉导波实验，以评估优化的传感器配置。调谐曲线显示出对兰姆波的单频响应，并远离主导频率进行机械滤波。还展示了对Lamb波进行机械放大和对铅笔芯断线声发射事件进行机械放大的传感器功能。

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