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Proceedings Paper

Phase-Locked Image Acquisition In Thermography
Author(s): P. K. Kuo; T. Ahmed; Huijia Jin; R. L. Thomas
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Paper Abstract

Phase-locked detection is a very useful instrumentation technique. It can be used whenever the desired signal is phase-coherent with another reference signal. Very frequently, the reference signal is, or can be derived from, the periodic external stimulus which is responsible for the signal in the first place. Typically the use of a lock-in amplifier can improve the signal-to-noise ratio by several orders of magnitude. We describe a successful implementation of an infrared imaging system in which the images are phase-locked with the periodic thermal radiation used as source of illumination and we also report the application of this phase-locked infrared imaging technique to the detection of microcracks in Cu foils deposited on polyimide substrates.

Paper Details

Date Published: 21 March 1989
PDF: 7 pages
Proc. SPIE 1004, Automated Inspection and High-Speed Vision Architectures II, (21 March 1989); doi: 10.1117/12.948970
Show Author Affiliations
P. K. Kuo, Wayne State University (United States)
T. Ahmed, Wayne State University (United States)
Huijia Jin, Wayne State University (United States)
R. L. Thomas, Wayne State University (United States)

Published in SPIE Proceedings Vol. 1004:
Automated Inspection and High-Speed Vision Architectures II
Michael J. W. Chen, Editor(s)

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