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Calculation of the contrast of moire deflectometric fringes

In a moire deflectometric phase object measuring system the contrast of the moire fringes formed by the first grating (G1) image and the second grating (G2) degrates and it causes some measurement errors in the system because of the diffraction effect of G1. This paper analyzes and measures the contrast degradation of the image of G1 directly. The complex amplitude, intensity, and contrast expressions of the G1 images with varied distance to the grating are also formulated and it is concluded that the determinative factors affecting the contrast of the grating image, in other words, the moire deflectometric fringes, are the black-white ratio of grating and the distance between the image and the grating.