A calibration device and method for a laser triangulation system

Abstract

The invention discloses a calibration device for a laser triangulation measurement system, which comprises a turntable, a thimble and a calibration cylinder; the calibration cylinder is fixedly placed above the turntable, and the thimble is pressed against the upper surface of the calibration cylinder. The invention also discloses a calibration method using the above-mentioned calibration device. A calibration cylinder with a slit and a checkerboard calibration plate is used as a tool to collect and calculate slit images, calibration plate images, and laser images in real time through six steps, and judge Whether the system calibration meets the preset requirements. Finally, the imaging plane of the camera is parallel to the reference plane, and the intersection line between the laser and the reference plane intersects and is perpendicular to the optical axis of the lens. The method of the invention is simple and effective, easy for operators to master, and has high adjustment accuracy, can effectively ensure the accuracy of a laser triangulation measurement system, and has good application prospects in the field of non-contact three-dimensional high-precision measurement.

Description

technical field [0001] The invention relates to a calibration device and method in the field of measurement, in particular to a calibration device and method for a laser triangulation measurement system. Background technique [0002] Triangulation technology has the characteristics of non-contact, high measurement accuracy, and fast dynamic response, and has a very wide range of applications in the field of high-precision three-dimensional measurement. In order to ensure the measurement accuracy of the triangulation method, the in-line laser, the camera and the datum must strictly satisfy a known geometric relationship. To achieve this goal, the previous technology mainly uses two methods. The first method is to use a fixed mechanical device, that is, the relationship between the in-line laser, the camera and the reference plane is fixed. The disadvantage of this method is that the mechanical position cannot be adjusted according to the size of the measured object, the meas...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the mechanical position cannot be adjusted according to the size of the measured object, the measurement range is small, and the flexibility is poor

The second method is to use an adjustable mechanical device. The disadvantage of this method is that the adjustment device may introduce mechanical errors.

In addition, the above two methods have a common problem, that is, when the mechanical device is worn or loosened, the original geometric relationship cannot be satisfied, and the measurement accuracy will inevitably decrease.

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