Real-time two-color laser speckle-shift strain measurement system

Meg L. Tuma; Lawrence C. Greer III; Michael J. Krasowski; Lawrence G. Oberle; Kristie A. Elam; Daniel C. Spina

doi:10.1117/12.312951

30 June 1998 Real-time two-color laser speckle-shift strain measurement system

Meg L. Tuma, Lawrence C. Greer III, Michael J. Krasowski, Lawrence G. Oberle, Kristie A. Elam, Daniel C. Spina

Proceedings Volume 3478, Laser Interferometry IX: Techniques and Analysis; (1998) https://doi.org/10.1117/12.312951
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1998, San Diego, CA, United States

Abstract

A real-time two-color laser speckle-shift strain measurement system based on Yamaguchi's technique was designed, built, and tested at room temperature. This non-contact 1D system detects surface strain in a structural fiber as it is pulled in a tensile test machine. Interference or speckle patterns from the laser illuminated fiber test specimen are recorded. As the fiber is pulled, its speckle patterns shift in proportion to the strain, translation, and rotation components of the sample deformation. Shifting speckle patterns are detected at real-time rates using 2 linear CCD arrays with image processing performed by a hardware correlator. Surface strain detected in fibers with diameters on the order of 100 micrometers can be resolved to 19 microstrain. This system was designed to be compact and robust and generally does not require surface preparation of the structural fibers.

Citation Download Citation

Meg L. Tuma, Lawrence C. Greer III, Michael J. Krasowski, Lawrence G. Oberle, Kristie A. Elam, and Daniel C. Spina "Real-time two-color laser speckle-shift strain measurement system", Proc. SPIE 3478, Laser Interferometry IX: Techniques and Analysis, (30 June 1998); https://doi.org/10.1117/12.312951

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KEYWORDS

Speckle pattern

Speckle

Optical correlators

Charge-coupled devices

Structured optical fibers

Fiber lasers

Silicon carbide

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