Statistical Analysis Of Shearography

Qiang Fang; Jiabi Chen; Yushan Tan

doi:10.1117/12.941678

17 February 1987 Statistical Analysis Of Shearography

Qiang Fang, Jiabi Chen, Yushan Tan

Proceedings Volume 0814, Photomechanics and Speckle Metrology; (1987) https://doi.org/10.1117/12.941678
Event: 31st Annual Technical Symposium on Optical and Optoelectronic Applied Sciences and Engineering, 1987, San Diego, CA, United States

Abstract

Based on the principle of wave and statistical optics, shearography is analysed thoroughly. The auto-correlation function of the transmittance of the specklegram, which is the essence of speckle interference, is calculated. The ensamble average intensity distribution of the output fringe speckle field of the filtering system is derived. We have shown that, if some conditions are satisfied by the system parameters, better contrast of the fringe field will be obtained, but it still is a function of in-plane deformation fields and the system parameters. In addtion, we have found that the out-of-plane deformation gradient is measurable only when the in-plane deformation value is smaller than a value determined by system parameters.

Citation Download Citation

Qiang Fang, Jiabi Chen, and Yushan Tan "Statistical Analysis Of Shearography", Proc. SPIE 0814, Photomechanics and Speckle Metrology, (17 February 1987); https://doi.org/10.1117/12.941678

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