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Proceedings Paper

Two-color laser speckle shift strain measurement system
Author(s): Meg L. Tuma; Michael J. Krasowski; Lawrence G. Oberle; Lawrence C. Greer; Daniel C. Spina; John P. Barranger
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Paper Abstract

A two color laser speckle shift strain measurement system based on the technique of Yamaguchi was designed. The dual wavelength light output from an Argon Ion laser was coupled into two separate single-mode optical fibers (patchcords). The output of the patchcords is incident on the test specimen (here a structural fiber). Strain on the fiber, in one direction, is produced using an Instron 4502. Shifting interference patterns or speckle patterns will be detected at real-time rats using 2 CCD cameras with image processing performed by a hardware correlator. Strain detected in fibers with diameters from 21 microns to 143 microns is expected to be resolved to 15 pe. This system was designed to be compact and robust and does not require surface preparation of the structural fibers.

Paper Details

Date Published: 17 July 1996
PDF: 9 pages
Proc. SPIE 2860, Laser Interferometry VIII: Techniques and Analysis, (17 July 1996); doi: 10.1117/12.276335
Show Author Affiliations
Meg L. Tuma, NASA Lewis Research Ctr. (United States)
Michael J. Krasowski, NASA Lewis Research Ctr. (United States)
Lawrence G. Oberle, NASA Lewis Research Ctr. (United States)
Lawrence C. Greer, NASA Lewis Research Ctr. (United States)
Daniel C. Spina, NASA Lewis Research Ctr. (United States)
John P. Barranger, NASA Lewis Research Ctr. (United States)


Published in SPIE Proceedings Vol. 2860:
Laser Interferometry VIII: Techniques and Analysis
Malgorzata Kujawinska; Ryszard J. Pryputniewicz; Mitsuo Takeda, Editor(s)

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