Patent ID: 7961333
Filing Date: 2011-06-14
Classification: G01J,G01N

Abstract:
1. Method for the electronic scanning of the intensity distribution of an optical interference pattern with a linear image sensor, which presets a fixed scanning frequency by its pixel width, the interference pattern resulting from the superimposing of two time partly coherent beams impinging under a random preset angle α with respect to one another and having interference fringes with a carrier frequency higher than the scanning frequency and a slowly variable amplitude modulation with respect to the pixel width, characterized in that an optical grating is so positioned in the optical path of the first of the two impinging beams and the image sensor in the diffraction pattern of the grating that at the position of image sensor at least one beam emanating from the grating in the direction of a secondary diffraction order and the second incident beam not influenced by the grating interfere and the beams include an angle β at the position of the image sensor which is smaller than α.