System calibration technique of profilometry by projected grating

In this paper, comprehensive analysis is performed aiming at the problem of inferior precision and bad maneuverability during system calibration of automatic profilometry by projected grating. Based on it, a new system construction is proposed and the object phase relation is derived. Because of without parallel and perpendicular restricted conditions in the conventional system construction, the CCD camera and the projecting device can be located arbitrarily. By importing the camera calibration technique, a convenient and practical calibration method is proposed. The new system and calibration method have been applied to the experiment, and the results prove that the system has better maneuverability and higher accuracy than the conventional method.