Two-color laser speckle shift strain measurement system

Meg L. Tuma; Michael J. Krasowski; Lawrence G. Oberle; Lawrence C. Greer III; Daniel C. Spina; John P. Barranger

doi:10.1117/12.276335

17 July 1996 Two-color laser speckle shift strain measurement system

Meg L. Tuma, Michael J. Krasowski, Lawrence G. Oberle, Lawrence C. Greer III, Daniel C. Spina, John P. Barranger

Proceedings Volume 2860, Laser Interferometry VIII: Techniques and Analysis; (1996) https://doi.org/10.1117/12.276335
Event: SPIE's 1996 International Symposium on Optical Science, Engineering, and Instrumentation, 1996, Denver, CO, United States

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.

Citation Download Citation

Meg L. Tuma, Michael J. Krasowski, Lawrence G. Oberle, Lawrence C. Greer III, Daniel C. Spina, and John P. Barranger "Two-color laser speckle shift strain measurement system", Proc. SPIE 2860, Laser Interferometry VIII: Techniques and Analysis, (17 July 1996); https://doi.org/10.1117/12.276335

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