Calibration Method of Beam Direction of Point Laser Measuring Probe on Three Coordinate Measuring Machine
A three-coordinate measuring machine and three-coordinate measurement technology, which are applied to measuring devices, optical devices, instruments, etc., can solve the problems of low measurement accuracy and low efficiency, reduce motion errors and laser probe reading errors, and ensure convergence. Correctness, improved robustness, and the effect of speed of calibration
Active Publication Date: 2020-11-17
SHANGHAI JIAOTONG UNIV
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The invention has low measurement accuracy and low efficiency
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[0029] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.
[0030] Please refer to figure 1 as shown, figure 1 The flow chart of the method for calibrating the beam direction of the point laser probe on the three-coordinate measuring machine provided by the embodiment of the present invention.
[0031] Because the calibration of the initial value only needs to obtain a rough result, in order to reduce the number of movements as much as possible to save time, this embodiment uses a three-coordinate measuring machine to move twice at a fixed distance along the X,...
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The invention relates to a light beam direction calibration method for a point laser probe of a three-coordinate measuring machine in the field of non-contact measurement. The method is divided into two parts of initial value calibration and optimization calibration, wherein the initial value calibration stage is of controlling the three-coordinate measuring machine to respectively move for M1, M2and M3 times along three axes of X, Y and Z so as to measure M1 + M2 + M3 + 1 points including an initial position in a standard ball, and calculating the initial estimation direction of the laser beam and the initial estimation position of the center of the standard ball in the coordinate system of the three-coordinate measuring machine; and the optimization calibration stage is of controlling the three-coordinate measuring machine to scan and measure a large number of point clouds on the surface of the standard ball, and using an optimization method to optimize the laser beam estimation direction obtained at the initial value calibration stage so as to obtain an accurate direction of the laser beam in the measurement coordinate system of the three-coordinate measuring machine. Accordingto the method in the invention, at the optimization calibration stage, a more accurate laser beam direction can be obtained by adopting a scanning type measurement mode.
Description
technical field [0001] The invention relates to the field of non-contact measurement, in particular to a method for calibrating the beam direction of a point laser measuring head on a three-coordinate measuring machine. Background technique [0002] Efficient and high-precision measurement of complex curved surface parts is an urgent need in the field of intelligent manufacturing. Traditional high-precision measurement equipment such as three-coordinate measuring machines are widely used in industrial precision measurement due to their mature technology, high precision, and good versatility. . However, the contact probe equipped with the traditional three-coordinate measuring machine has the disadvantages of slow speed, low flexibility, and wear and tear. Non-contact optical probe has become a new trend. [0003] Optical probes can be mainly divided into point laser probes, line laser probes, and surface laser probes. Although the measurement efficiency of point laser prob...
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IPC IPC(8): G01B11/00
CPCG01B11/007
Inventor 朱利民沈毅君张旭
Owner SHANGHAI JIAOTONG UNIV