A method of obtaining accurate 3D data by using 2D line laser scanner

Abstract

The invention provides a method for obtaining three-dimensional accurate data by adopting a two-dimensional linear laser scanner and belongs to the field of reverse engineering and three-dimensional measurement. According to the method, a two-dimensional local coordinate system is established based on the linear laser scanner, a high-precision electrically controlled movable platform is adopted toprovide third-dimensional coordinates, and dimension raising of two-dimensional position information to three-dimensional position information of measured workpieces is achieved. For correcting three-dimensional coordinate deviations caused by clamp installing errors and manufacturing errors, a space angle compensation method is adopted to calculate a converting torque between a theoretical measurement coordinate system and an actual measurement coordinate system, thus measurement errors brought by angle deviations are eliminated, and accurate reestablishment of three-dimensional informationis achieved. The problem of high-precision measurement in the machining process of aerospace parts is effectively solved by adopting the method, the method is flexible, efficient and good in robustness, and integral measurement of non-contact and high-precision machining process is achieved.

Description

technical field [0001] The invention belongs to the field of reverse engineering and three-dimensional measurement, in particular to a method for obtaining three-dimensional accurate data by using a two-dimensional line laser scanner. Background technique [0002] Large-scale aerospace equipment has extremely high requirements on the machining accuracy of workpieces, and high-precision measuring equipment is required to obtain accurate three-dimensional data and provide geometric parameter basis for precision machining. In the process of precision machining, it is necessary to accurately measure the geometric dimensions of the workpiece, and it is also necessary to detect the finished or semi-finished workpiece after processing. Due to the complex environment, high precision requirements, high efficiency requirements, and large measurement range in the process of processing large parts, the precision measurement of processed workpieces has become a difficult problem. [000...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art. For online detection of the processing process or the detection of processed products, the line laser scanner acquires the two-dimensional position information of the measured piece, that is, the X-axis and Z-axis position information, which is not necessary. The Y-axis position information cannot form accurate three-dimensional information

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