通过简单长度测量和双面系统测试测量激光跟踪仪水平角度编码器的尺度误差。

IF 1.5 4区 工程技术
B Muralikrishnan, C Blackburn, D Sawyer, S Phillips, R Bridges
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引用次数: 31

摘要

本文描述了一种估计激光跟踪仪水平角编码器标度误差的方法。该方法不需要昂贵的仪器,如旋转台或甚至校准的工件。在两个安装在跟踪器高度上的目标之间实现了一个未校准但稳定的长度。跟踪器从不同的方位位置测量这两个目标之间的距离(例如,间隔为20°/ 360°)。每个目标的正面和背面都要测量。从这些数据可以估计出低阶谐波标度误差,然后可以用来校正编码器的误差图,以提高跟踪器的角度测量精度。我们已经在本文中对二阶谐波进行了证明。补偿偶阶谐波很重要,因为它们的影响不能通过平均正面和背面测量来消除,而奇阶谐波可以通过平均来消除。我们测试了来自三家不同制造商的六台追踪器。其中两个跟踪器是在撰写本文时引入的新模型。对于两家厂商生产的较老的跟踪器,在距跟踪器7 m处放置的7.75 m水平长度的长度误差在校正误差图之前为±65 μm。在修正二阶比例尺误差后,它们减小到±25 μm以下。来自同一制造商的较新的跟踪器没有显示此错误。来自第三家制造商的旧跟踪器也没有显示此错误。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Measuring Scale Errors in a Laser Tracker's Horizontal Angle Encoder Through Simple Length Measurement and Two-Face System Tests.

Measuring Scale Errors in a Laser Tracker's Horizontal Angle Encoder Through Simple Length Measurement and Two-Face System Tests.

Measuring Scale Errors in a Laser Tracker's Horizontal Angle Encoder Through Simple Length Measurement and Two-Face System Tests.

Measuring Scale Errors in a Laser Tracker's Horizontal Angle Encoder Through Simple Length Measurement and Two-Face System Tests.

We describe a method to estimate the scale errors in the horizontal angle encoder of a laser tracker in this paper. The method does not require expensive instrumentation such as a rotary stage or even a calibrated artifact. An uncalibrated but stable length is realized between two targets mounted on stands that are at tracker height. The tracker measures the distance between these two targets from different azimuthal positions (say, in intervals of 20° over 360°). Each target is measured in both front face and back face. Low order harmonic scale errors can be estimated from this data and may then be used to correct the encoder's error map to improve the tracker's angle measurement accuracy. We have demonstrated this for the second order harmonic in this paper. It is important to compensate for even order harmonics as their influence cannot be removed by averaging front face and back face measurements whereas odd orders can be removed by averaging. We tested six trackers from three different manufacturers. Two of those trackers are newer models introduced at the time of writing of this paper. For older trackers from two manufacturers, the length errors in a 7.75 m horizontal length placed 7 m away from a tracker were of the order of ± 65 μm before correcting the error map. They reduced to less than ± 25 μm after correcting the error map for second order scale errors. Newer trackers from the same manufacturers did not show this error. An older tracker from a third manufacturer also did not show this error.

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来源期刊
自引率
33.30%
发文量
10
期刊介绍: The Journal of Research of the National Institute of Standards and Technology is the flagship publication of the National Institute of Standards and Technology. It has been published under various titles and forms since 1904, with its roots as Scientific Papers issued as the Bulletin of the Bureau of Standards. In 1928, the Scientific Papers were combined with Technologic Papers, which reported results of investigations of material and methods of testing. This new publication was titled the Bureau of Standards Journal of Research. The Journal of Research of NIST reports NIST research and development in metrology and related fields of physical science, engineering, applied mathematics, statistics, biotechnology, information technology.
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