Scanning Heterodyne Micro-Interferometer for High Resolution Contour Mapping
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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
Previous studies [1] described a sample scanning heterodyne interferometer which produced contour plots of parameters derived from ultrasonic time domain waveform measurements. Subsequent studies [2] described an alternative design that produced similar contour plots by scanning the image of a stationary sample. This enhancement eliminated the need to continuously realign the system, and increased resolution by providing a stable sample plane. This paper describes a further enhanced system that uses a large aperture, long distance microscope to produce a magnified image with higher resolution than previously obtainable. This image scanning micro-interferometer has been developed for imaging small static and dynamic displacements with high resolution and is particularly useful for studying interfaces in fiber reinforced composites.