Abstract: The design of a new detecting instrument for moire fringe speciality by using CCD is introduced. The structure of the new instrument is completely open and the process of detecting is intuitionistic. This instrument can be used to detect all the characteristics of moire fringe. This paper primarily focuses on the structure and the measuring theory of the instrument. The moved number of moire fringe which is caused by relative shift of the gratings is nice, and the width of molte fringe which is caused by the bias angel of the gratings is verified to closely consistent with theoretical result.

Key words: moire fringe, CCD, exposed structure