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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Large-area ultrasonic gap profile measurements using two-dimensional PVDF 'blanket array' transducers
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Large-area ultrasonic gap profile measurements using two-dimensional PVDF 'blanket array' transducers

机译：使用二维PVDF“毛毯阵列”换能器进行大面积超声间隙轮廓测量

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摘要

A technique is described for utilizing two-dimensional ultrasonic transducer arrays to accurately measure the spacing (i.e., the gap profile) between large-area mating surfaces. The acoustic measurement theory for pulse-echo and pitch-catch gap profile measurements is derived from a generalized KLM model representation of ultrasonic transducers located within the gap between two mating structures. Expressions for the ultrasonically measured gap spacing are derived in terms of the thicknesses and longitudinal acoustic velocities of the constituent layers of the transducer element(s), adhesive layers(s), and gap medium. Extremely thin PVDF two-dimensional arrays were fabricated and adhered to the inside of a precision gap profile device for demonstrating the measurement technique. Two-dimensional gap profile measurements were made to /spl plusmn/0.001" accuracy for a variety of gap profiles in the range of 0-0.200" thickness. Gap profile measurements were made with both liquid and air as the gap medium and the results show potential for measuring otherwise inaccessible gap profiles between structures.
机译：描述了一种利用二维超声换能器阵列来准确测量大面积配合表面之间的间隔（即，间隙轮廓）的技术。用于脉冲回波和音高捕获间隙轮廓测量的声学测量理论是从位于两个配合结构之间的间隙中的超声换能器的广义KLM模型表示得出的。根据换能器元件，粘合剂层和间隙介质的组成层的厚度和纵向声速，得出超声测量的间隙间距的表达式。制造了极薄的PVDF二维阵列，并将其粘附到精密间隙轮廓仪的内部，以演示测量技术。对厚度范围为0-0.200“的各种间隙轮廓，进行了/ spl plusmn / 0.001”精度的二维间隙轮廓测量。使用液体和空气作为间隙介质进行间隙轮廓测量，结果显示了测量否则无法访问的结构之间间隙轮廓的潜力。

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