Angular error compensation for laser tracker
Angular error compensation for laser tracker
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DOI：
10.3788/ope.20142209.2299
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
卢荣胜 Lu Rong-sheng;李万红 Li Wan-hong;劳达宝 Lao Da-bao;周维虎 Zhou Wei-hu;丁功明 Ding Gong-ming
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作者：
卢荣胜 Lu Rong-sheng;李万红 Li Wan-hong;劳达宝 Lao Da-bao;周维虎 Zhou Wei-hu;丁功明 Ding Gong-ming
针对激光跟踪器测角精度直接影响仪器测量精度的问题，提出了一种基于自准直器和多镜多面体相结合的激光跟踪器金属圆光栅测角误差的离散标定方法。研究了基于谐波分析的误差补偿方法。然后，根据幅值较大且相位基本不变的谐波分量建立补偿模型，克服了最小二乘法的不收敛问题。分析了角度测量误差的不确定度。分析结果表明，水平角度测量精度从1.60“降至0.90”，补偿后的垂直角从4.89“提高到0.91”，精度分别提高了44%和81%，从弧秒尺度到弧下秒尺度，有效地补偿了激光跟踪器的谐和垂直轴系统的测角误差，也为其他测角系统的误差补偿提供了参考。
As the angle measurement accuracy for a laser tracker affects the instrument measurement accuracy directly,a discrete calibration method for the angle measurement errors of a metal circular grating in the laser tracker was proposed based on an autocollimator combined with a multi-mirror polyhedron.The error compensation method based on harmonic analysis was studied.Then,a compensation model was built up on the basis of the harmonic wave components whose amplitudes are large and phases remain essentially constant,by which the no convergence from least square method was overcome.Futhermore,the calibration uncertainty of angle measurement errors was analyzed.The analysis results show that the horizontal angle measurement accuracy is reduced from 1.60″to0.90″,and the vertical angle from 4.89″to 0.91″after compensation.The accuracy is improved by44%and 81% respectively,and has been from an arc second scale to a sub-arc second scale.The results indicate that the proposed method effectively compensates angle measurement errors forharmonic and vertical axis systems of the laser tracker,and also provides a reference for other error compensation of angle measuring systems.