Two-dimensional laser galvanometer scanning system based on binocular stereo vision and calibration method

Abstract

The invention discloses a two-dimensional laser galvanometer scanning system based on binocular stereo vision, comprising a laser galvanometer system and a calibration device. The calibration device is composed of a linear displacement system and a binocular stereo vision system. The invention further discloses a calibration method of the two-dimensional laser galvanometer scanning system based on binocular stereo vision. The laser galvanometer system is calibrated by building a mapping relationship between specific input digital signals and the direction and position vectors of laser beams corresponding to the signals under a binocular system coordinate system with the aid of an artificial neural network algorithm. The calibration method needs no complex galvanometer system physical parameter modeling process. The calibration result is highly precise and reliable. Moreover, the calibration method can be used in various practical applications based on a galvanometer system, such as laser positioning projection and object surface three-dimensional shape measurement.

Description

technical field [0001] The invention belongs to the technical field of galvanometer scanning system calibration, and specifically refers to a two-dimensional laser galvanometer scanning system and a calibration method based on binocular stereo vision. Background technique [0002] With the continuous development of laser scanning galvanometer manufacturing technology, the positioning accuracy, repeatability and scanning speed of the galvanometer have been greatly improved, so the laser galvanometer is widely used in many fields, such as laser processing, laser projection , laser three-dimensional measurement, laser medical cosmetology, etc. Usually, the laser galvanometer scanning system needs to be calibrated before it is used, that is, to establish the relationship between the deflection of the galvanometer scanning head and the coordinates of the spot formed by the laser beam on the surface of the scanned object. At present, most galvanometer system calibration methods a...

AI Technical Summary

Problems solved by technology

Because the actual structure of the galvanometer scanning system is relatively complex and there are many sources of errors, it is often difficult for the physical model of the galvanometer to fully express various error factors, resulting in low calibration accuracy

In order to fully express the geometric relationship in the galvanometer and various possible error factors, the established galvanometer system model will contain more physical parameters, and too many parameters will make the final model parameter optimization solution process It is easy to fall into a local optimal solution, thus affecting the reliability of the calibration results

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