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首页> 外文期刊>Applied optics >Simple, all-optical, noncontact, depth-selective, narrowband surface acoustic wave measurement system for evaluating the Rayleigh velocity of small samples or areas
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Simple, all-optical, noncontact, depth-selective, narrowband surface acoustic wave measurement system for evaluating the Rayleigh velocity of small samples or areas

机译：简单，全光，非接触，深度选择，窄带表面声波测量系统，用于评估小样本或区域的瑞利速度

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In this paper a new ultrasonic testing system is described that utilizes noncontact optical methods to generate and detect surface acoustic waves (SAWs) and has significant applications in the nondestructive evaluation of surface material. A narrowband SAW is generated with a new and straightforward grating mask image projection method that provides fast switching and a controllable frequency band, and hence control of the penetration depth of the ultrasonic wave. A narrowband SAW with center frequency above 30 MHz, and hence better depth resolution, is generated. The detection of the SAW is performed with a simplified design of an optical fiber interferometer that has good sensitivity and manoeuvrability without requiring additional auxiliary components. The novel combination of these two optical techniques permits the measurement of small samples that are otherwise difficult to measure, especially nondestructively. A model was constructed to simulate the temporal characteristics of the generated narrowband SAW and showed good agreement with experiment. Measurements on an aluminum sample and an extracted human incisor demonstrate the system's performance.
机译：本文介绍了一种新的超声测试系统，该系统利用非接触光学方法生成和检测表面声波（SAW），并在表面材料的无损评估中具有重要的应用。窄带声表面波是通过一种新型，直接的光栅掩模图像投影方法生成的，该方法可提供快速切换和可控制的频带，从而可控制超声波的穿透深度。产生了中心频率高于30 MHz的窄带声表面波，因此具有更好的深度分辨率。 SAW的检测是通过简化设计的光纤干涉仪进行的，该干涉仪具有良好的灵敏度和可操作性，而无需其他辅助组件。这两种光学技术的新颖结合使得可以测量难以测量的小样本，尤其是无损测量。建立了一个模型来模拟所产生的窄带声表面波的时间特性，并与实验吻合良好。对铝样品和提取的人类门牙的测量证明了该系统的性能。

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