Curved surface detection method based on phase deflection

Abstract

The invention discloses a curved surface detection method based on phase deflection, and belongs to the technical field of optical detection. Comprising the following steps: constructing a plurality of CCD cameras and display screens, and then fixing a to-be-detected curved surface on a fixing station; the display screen moves to a preset position under the traction of the movement device, and the display screen plays sine or cosine fringes moving according to a preset phase according to the shooting frequency of the CCD camera; recording an image of the reflection fringes of the curved surface to be tested through a CCD camera; phase unwrapping is carried out by using a phase shifting method; the phase distribution is converted into position coordinate distribution, position coordinates are converted into inclination angle distribution, and finally the inclination angle distribution is synthesized into three-dimensional surface distribution. Distortion images on the two sides of the curved glass to be detected are obtained from the same angle through the multiple CCD cameras, data of the curved glass are obtained more comprehensively, and then a large-area detected object is accurately measured at a time through image splicing.

Description

technical field [0001] The invention belongs to the technical field of optical detection, in particular to a curved surface detection method based on phase deflection. Background technique [0002] In the field of glass detection, especially the detection of automobile glass, such as automobile sunroof, its surface is three-dimensional curved glass. In order to ensure that qualified automobile sunroof can be produced, it is necessary to have testing equipment to detect it after the sunroof is produced. Therefore, the detection process is different from the use of high-definition cameras or laser sensors for detection. [0003] The existing curved surface inspection methods mostly use contact inspection methods. By fixing the car sunroof and then passing through several lifting columns, the positions of several points on the car glass are obtained. If all meet the design requirements, it is considered to be a synthetic product. . Obviously, the above measuring device can on...

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Problems solved by technology

Obviously, the above measurement device can only be used to detect whether the surface shape of the automobile glass meets the design requirements, and cannot obtain the distribution of the surface data of the automobile glass

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