Enhancement of SAW laser probe measurements by signal processing

1999 IEEE Ultrasonics Symposium. Proceedings. International Symposium (Cat. No.99CH37027) Pub Date : 1999-10-17 DOI:10.1109/ULTSYM.1999.849389

H. Engan, A. Rønnekleiv

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引用次数: 25

Abstract

Many different types of the SAW laser probe have been used for several years to characterize SAW devices as well as inherent properties of particular materials. Our laser probe is of a modified knife-edge type. Operating with a linear response, it has a high dynamic range. The probe provides full phasor information of the detected signal, and directional properties of the detection process makes it possible to determine the surface tilt components in two spatially orthogonal directions. We first sum up the basic characteristics of the probe. We show several examples where we take advantage of these features combined with signal processing techniques such as the fast Fourier transform. This enables us to concentrate on distinct properties of the devices under test. We thus exploit the spatial frequency domain and, in the basic detection process, the directions of the wavecrests, to enhance measurements of particular properties. Examples include results obtained from measurements on a selection of components containing various structures.

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用信号处理增强SAW激光探头测量

许多不同类型的SAW激光探头已经使用了几年来表征SAW器件以及特定材料的固有特性。我们的激光探头是改良的刀口型。它具有线性响应，具有高动态范围。探头提供被检测信号的完整相量信息，并且检测过程的方向性使得可以确定两个空间正交方向上的表面倾斜分量。我们首先总结了探头的基本特性。我们展示了几个例子，其中我们利用这些特征与信号处理技术相结合，如快速傅里叶变换。这使我们能够专注于被测设备的不同特性。因此，我们利用空间频域，在基本的检测过程中，利用波峰的方向，来增强对特定特性的测量。例子包括对含有各种结构的选定部件进行测量得到的结果。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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1999 IEEE Ultrasonics Symposium. Proceedings. International Symposium (Cat. No.99CH37027)

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