Measurement method of reflective surface parts based on optical vision and conoscopic polarization group sum

Abstract

The invention is applicable to the technical field of curved-surface part measurement, and provides a reflective curved-surface part measuring method based on a combination of light vision and conoscopic polarization. The reflective curved-surface part measuring method comprises the steps of: A, carrying out modeling; b, performing modeling analysis; c, respectively measuring a polyhedral standardblock by using a surface structured light vision sensor and a conoscopic polarization holographic sensor, so as to determine corresponding point sets of point cloud data P1 and P2; d, geometrically processing the point cloud data obtained in the step C by using a point cloud processing assembly, performing influence overlapping comparison on three-dimensional modeling in the steps A, B and C, andconducting confirmation comparison on modeling data in the steps by adopting a coordinate system rotation method; and measuring a complex curved-surface part by using a method of combining surface structured light with conoscopic polarization holography, synthesizing the obtained three-dimensional point cloud data under the same coordinate, and finally acquiring complete three-dimensional point cloud data of the part. Therefore, the reflective curved-surface part measuring method can realize effective measurement of the reflective curved-surface part, and can improve the measurement efficiency and measurement precision.

Description

technical field [0001] The invention relates to the technical field of curved surface parts measurement, in particular to a method for measuring reflective curved surface parts based on optical vision and conoscopic polarization group sum. Background technique [0002] Due to the large change in surface reflectivity of parts with complex curved surfaces, it is difficult to measure them. The existing technology cannot achieve the purpose of high-precision and high-efficiency non-coating measurement at the same time. With the rapid development of electronic technology and computer technology, surface structured light vision non-contact measurement technology has achieved unprecedented development. The measurement accuracy of structured light measurement technology based on computer vision can reach 0.025mm, and the measurement speed can exceed one million points per second. When performing optical non-contact measurement, problems such as mutual reflection, directional reflec...

AI Technical Summary

Problems solved by technology

But the disadvantages of doing this are: 1) additional measurement process: a long preparation time is required before measurement, and the coating will be removed after measurement; 2) the cost of measurement is increased; 3) the accuracy of measurement results is affected (coating Thickness is about 0.01-0.04mm); ④Chemical substances pollute the environment and affect the physical and mental health of measuring personnel; ⑤The most important thing is that some parts with high surface performance requirements (such as aeroengines with high-performance surface blades) Its surface is sprayed with any chemical substance

[0003] In summary, there are obviously inconveniences and defects in the actual use of the existing technology, so it is necessary to improve

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