Three-dimensional shape vision measuring method and system for large component surface

Abstract

The invention provides a three-dimensional shape vision measuring method and system for a large component surface. The system comprises an image acquiring system, a controller, a computer, a three-dimensional optical measuring head, and a plurality of plane targets, wherein the plane targets are distributed around a measured objected; the three-dimensional optical measuring head and the plane targets are connected with the controller and the image acquiring system; the controller and the image acquiring system are connected with the computer; the three-dimensional optical measuring head comprises a grating binocular vision sensor and a wide-field camera, wherein the grating binocular vision sensor is used for measuring the three-dimensional shape of different sub regions of the large component surface; and the wide-field camera is used for measuring the plane targets; the computer uses the plane targets measured by the wide-field camera as medium, so that the three-dimensional shape data of different sub regions is integrated to a global coordinate system. The plane targets are used as medium, marks are not needed to be pasted on the measured object, and the global integrating device is not needed; simultaneously, the positions of the plane targets can be flexibly arranged according to the shape of the measured object without a measuring dead angle.

Description

technical field [0001] The invention relates to the technical field of three-dimensional topography visual measurement, in particular to a method and system for visual measurement of three-dimensional topography on the surface of large components. Background technique [0002] The measurement of the three-dimensional topography of the surface of large components is the basic support technology for modern reverse engineering and product digital design and manufacturing. It is widely used in many fields, especially in the manufacturing industry, such as the shape measurement of automobiles, aircraft, ships, and spacecraft, and the measurement of large molds. , measurement of large mechanical components such as seamless steel pipes, installation of large antennas and deformation monitoring, etc. Therefore, the study of the three-dimensional topography measurement method on the surface of large components is of great significance to ensure the smooth development and production o...

AI Technical Summary

Problems solved by technology

The three-coordinate measuring machine is a general-purpose equipment for three-coordinate measurement. It has good measurement accuracy. The main disadvantage is that the measurement efficiency is low and the measurement range is small, generally within 1 to 2 meters.

The principle of this method is simple, and it can realize the visual measurement of the three-dimensional topography of the entire large-scale component surface, but there are limitations such as the difficulty of global calibration of multiple visual sensors on site, and the measurement accuracy of the system after global calibration is easily affected by the strong vibration environment on site.

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