Spatial Frequency Domain Technique: An Approach for Analyzing the Scanning Laser Acoustic Microscope Interferogram Images

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引用次数: 12

Abstract

Abstmf-An acoustic interferogram of equal phase wavefronts is produced with the scanning laser acoustic microscope. The interferogram contains information about the ultrasonic velocity distribution of the specimen under investigation. Through appropriate signal processing, the information can be transformed into a one-dimensional velocity map. This has been done quite successfully in the spatial domain, where the specimen is relatively homogeneous. For heterogeneous specimens, the spatial domain technique often fails. A new technique has been developed to reduce the interferograms to a one-dimensional velocity map. This approach operates in the spatial frequency domain and appears to be more reliable for heterogeneous specimens than the spatial domain approach. The theory and implementation of the spatial frequency domain technique (SFDT) are reported, and the two techniques are compared with each other. SFDT utilizes a smaller pixel size than the spatial domain technique. In addition SFDT is faster and more noise tolerant. The extension of the SFDT to produce two-dimensional velocity distribution images is also reported.
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空间频域技术:一种扫描激光声显微镜干涉图图像分析方法
摘要:利用扫描激光声显微镜产生了等相位波前的声干涉图。干涉图包含了被测试样的超声速度分布信息。通过适当的信号处理,可以将信息转换成一维速度图。这已经做了相当成功的空间领域,其中的标本是相对均匀的。对于非均质试样,空间域技术往往失效。提出了一种将干涉图简化为一维速度图的新技术。这种方法在空间频域操作,似乎比空间域方法更可靠的异质标本。介绍了空间频域技术(SFDT)的原理和实现,并对两种技术进行了比较。SFDT利用比空间域技术更小的像素尺寸。此外,SFDT更快,更耐噪。本文还报道了SFDT的扩展,以产生二维速度分布图像。
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