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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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Fourier transforms
Cameras
Diffraction
Moire patterns
Holographic interferometry
Mechanics
Diffraction gratings
