在机测量线激光传感器安装位姿的全局标定
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TH74 TN249

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国家自然科学基金(51975372,52105524)项目资助


Global position calibration of 2D laser profiler for on-machine measurement
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    摘要:

    针对三轴数控机床激光测头安装位姿误差造成测量误差且不易调整和校准的问题,提出了一种在机测量线激光传感器 安装位姿标定方法。 建立了线激光在机测量系统的数学模型,通过机床运动带动线激光测头对标定基准点的空间位置进行测 量,基于手眼标定原理给出了关于测头安装位姿参数的线性求解算法,完成了对测头安装误差的全局标定。 考虑了机床定位误 差对于标定结果精度的影响,采用蒙特卡洛模拟进行了误差分析。 采用半径为 35 mm 的圆孔进行测量验证,实验结果表明,标 定后圆孔测量误差为 0. 051 6 mm,测量精度提高了约 96% ,实验结果验证了该标定方法的有效性和可行性。

    Abstract:

    The installation pose error of the laser probe mounted on a three-axis CNC machine tool is not easy to adjust, which may result in measurement error. In this article, a posture calibration method of the laser probe for on-machine measurement (OMM) is proposed. A mathematical model based on the laser line profiler for OMM is formulated, the spatial pose of the calibration reference point is measured by the laser probe, and the linear algorithm to obtain the pose parameters of the probe installation is derived based on the handeye calibration. Considering the influence of the positioning errors of the machine tool on the accuracy of the calibration, an error analysis is implemented by using Monte Carlo simulation. Experimental results show that when measuring a circular hole with a radius of 35 mm, the measurement error of the circular hole after calibration is 0. 051 6 mm, and the measurement accuracy is improved by approximately 96% , which validate the effectiveness and feasibility of the proposed calibration method.

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李津容,葛广言,冯晓冰,杜正春.在机测量线激光传感器安装位姿的全局标定[J].仪器仪表学报,2022,43(9):158-165

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  • 在线发布日期: 2023-02-06
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