Optical Strain Measurement System Development

Christian T. Lant; Walid Qaqish

doi:10.1117/12.941693

17 February 1987 Optical Strain Measurement System Development

Christian T. Lant, Walid Qaqish

Proceedings Volume 0814, Photomechanics and Speckle Metrology; (1987) https://doi.org/10.1117/12.941693
Event: 31st Annual Technical Symposium on Optical and Optoelectronic Applied Sciences and Engineering, 1987, San Diego, CA, United States

Abstract

A laser speckle, differential strain measurement system has been built and tested for future applications in hostile environments. One-dimensional electronic correlation of speckle pattern movement allows a quasi-real time measure of strain. The system has been used successfully to measure uniaxial strain reaching into plastic deformation of a test specimen, at temperatures ranging to 450°C. A resolution of 16 microstrain is given by the photodiode array sensor pitch and the specimen to sensor separation. The strain meas-urement error is estimated to be ±18 microstrain ±0.3 percent of the strain reading. The upper temperature limit of the gauge is determined by air density perturbations causing decorrelation of the reference and shifted speckle patterns, and may be improved by limiting convective flow in the immediate vicinity of the test specimen.

Citation Download Citation

Christian T. Lant and Walid Qaqish "Optical Strain Measurement System Development", Proc. SPIE 0814, Photomechanics and Speckle Metrology, (17 February 1987); https://doi.org/10.1117/12.941693

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