A spectral analysis of a crossed grating marked on the surface of a specimen and recorded by a C.C.D. camera is presented. The procedure is based on the use of a bidimensional F.F.T algorithm coupled with an interpolation process. It leads to the accurate determination of frequencies. Numerical simulations indicate that the strain sensitivity is of the same order than the sensitivity given by a strain gage technique.
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Fabrice J. Bremand, Alexis Lagarde, "Strain measurements on soft materials application to cloth and papers," Proc. SPIE 1554, Second International Conference on Photomechanics and Speckle Metrology, (1 December 1991);