Apparatus and method for calibration of laser triangulation system

Abstract

Disclosed in the invention is an apparatus for calibration of a laser triangulation system. The apparatus comprises a rotating platform, a top pin and a calibration cylinder; the calibration cylinder is fixedly arranged above the rotating platform; and the top pin is compressed at the upper surface of the calibration cylinder. In addition, the invention also discloses a calibration method for using the calibration apparatus. The calibration cylinder with a slit and checkerboard calibration boards is used as a tool; and on the basis of six steps, a slit image, a calibration board image and a laser image are collected and calculated in real time and whether the system calibration meets the preset requirement is determined. And at last, an imaging plane of a camera is in parallel with a reference plane; and an intersecting line of the laser and the reference plane is intersected with and is perpendicular to an optical axis of a lens. The provided method is simple and effective and can be mastered by an operator easily. Moreover, the adjustment precision is high; accuracy of the laser triangulation system can be effectively ensured; and thus the method and the apparatus have the good application prospects in the non-contact three-dimensional high-precision measurement field.

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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