A laser beam on-site calibration method and device

Abstract

The invention provides a laser beam on-site calibration method, specifically: leveling the calibration plate, the calibration plate has three through holes, and the connecting lines between two through holes are vertical; using a laser displacement sensor to emit a laser beam to the calibration plate And imaging; drive the laser displacement sensor to move a certain distance in the Y-axis direction of the machine tool, and then emit the laser beam to the calibration plate and image; drive the laser displacement sensor to move a certain distance in the Z-axis direction of the machine tool, and then emit the laser beam to the calibration plate and image; according to Calculate the deflection angle between the laser beam and the spindle of the machine tool based on the positional relationship of the three holes on the three images. The present invention also provides a device for realizing the above method, including a calibration plate, a leveling device, a CCD camera and a processor. The invention drives the laser displacement sensor through the movement of each axis of the machine tool, uses a CCD camera to capture the image of the laser beam spot on the calibration plate, and accurately measures the azimuth characteristics of the laser beam through digital image analysis to compensate the later measurement results.

Description

technical field [0001] The invention relates to the technical field of calibrating the direction characteristic of a laser beam, and more specifically, the invention relates to a laser beam on-site calibrating method and device. Background technique [0002] As a non-contact measurement technology, laser measurement technology has greatly improved its measurement accuracy and efficiency compared with traditional non-contact probes, and is more and more widely used in the detection field. The principle of laser measurement is to use the laser displacement sensor to emit a beam of laser light on the surface of the measured object, and measure the distance from the object to the laser displacement sensor by receiving the reflected light. [0003] For the measurement of some large free-form surface parts, such as large propeller blades, turbine runner chambers and other parts, the existing machine tool equipment is often used, and then the laser displacement sensor is equipped t...

AI Technical Summary

Problems solved by technology

[0003] For the measurement of some large free-form surface parts, such as large propeller blades, water turbine runner chambers, etc., the existing machine tool equipment is often used to detect the shape of the part with a laser displacement sensor. During the detection process, the laser The laser emitted by the displacement sensor is as coaxial as possible with the spindle axis of the machine tool, but due to installation errors or positioning errors of the machine tool itself, there will be a certain deviation between the actual direction of the laser beam and the spindle axis, and this deviation will affect the final measurement results. There is a large error, so there is an urgent need for a deviation that can accurately calibrate the direction of the laser beam to compensate for the later measurement results, so as to ensure the measurement accuracy

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