Wave Analysis for the Acoustic Microscope
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Begun in 1973, the Review of Progress in Quantitative Nondestructive Evaluation (QNDE) is the premier international NDE meeting designed to provide an interface between research and early engineering through the presentation of current ideas and results focused on facilitating a rapid transfer to engineering development.
This site provides free, public access to papers presented at the annual QNDE conference between 1983 and 1999, and abstracts for papers presented at the conference since 2001.
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Abstract
The acoustic microscope, which utilizes focused ultrasound at hundreds of megahertz or even a few gigahertz, can have comparable wavelength and therefore resolution with the optical microscope since the velocity of ultrasound is five orders lower than that of light in fluid media [1, 2]. Since the appearance of the first acoustic microscope [3], extensive research has been devoted to its applications in the nondestructive testing of materials. With this instrument high contrast micrographs can be obtained which contain unique information not available in other imaging tools and the elastic properties of optically opaque materials can be determined. It is particularly suitable for detecting surface and subsurface defects in metal and ceramic materials and for examining integrated circuits and biological cells.