17 February 1987 Statistical Analysis Of Shearography
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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.
© (1987) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Qiang Fang, Qiang Fang, Jiabi Chen, Jiabi Chen, Yushan Tan, Yushan Tan, } "Statistical Analysis Of Shearography", Proc. SPIE 0814, Photomechanics and Speckle Metrology, (17 February 1987); doi: 10.1117/12.941678; https://doi.org/10.1117/12.941678

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