A Transit Tilt and Offset Errors Calibration Method for Improving Laser Tracker Measurement Accuracy Based on the Telecentric Measurement System
Laser trackers are instruments used to measure the three-dimensional coordinates of objects with high precision. It is necessary to study calibration methods to identify geometric errors of laser trackers so as to compensate for errors and improve measurement accuracy. Among the offsets, tilts, and...
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MDPI AG
2024-03-01
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| Online Access: | https://www.mdpi.com/2076-3417/14/6/2251 |
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| author | Shan Wang Zili Zhang Dengfeng Dong Tianci Feng Qifan Qiu Fanchang Meng Guoming Wang Chengjun Cui Rongyi Ji Yingling Pan Tao Gong Weihu Zhou |
| author_facet | Shan Wang Zili Zhang Dengfeng Dong Tianci Feng Qifan Qiu Fanchang Meng Guoming Wang Chengjun Cui Rongyi Ji Yingling Pan Tao Gong Weihu Zhou |
| author_sort | Shan Wang |
| collection | DOAJ |
| description | Laser trackers are instruments used to measure the three-dimensional coordinates of objects with high precision. It is necessary to study calibration methods to identify geometric errors of laser trackers so as to compensate for errors and improve measurement accuracy. Among the offsets, tilts, and eccentricity errors in the system, the transit tilt and offset errors play important roles and have an essential effect on the measurement accuracy, which need to be calibrated and compensated for. Current methods for detecting geometric errors between the transit and standing axes are complex and time-consuming. In this paper, a fast and novel calibration method is proposed, which can be easily operated with high precision. Two test rods are coaxially mounted on the ends of the transit axis to extend the hidden transit axis. Then, a telecentric measurement system is used to record the projection images of the test rods and identify the position of the transit axis. The transit offset and tilt errors were thus obtained by comparing the central axis positions of the two test rods before and after the standing axis rotated 180 degrees. Moreover, a numerical analysis method was proposed based on the least square circle fitting method to calibrate the installation eccentricity errors of the test rods. Experimental results verify that the measurement accuracy of the laser tracker can be improved after error compensation using the calibrated transit offset and tilt errors. The measurement error of the laser tracker can be reduced from 161 µm to about 73 µm after compensation at a distance of 5 m, while the error can be decreased from 143 µm to about 108 µm at a distance of 10 m. |
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| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-04-24T18:35:48Z |
| publishDate | 2024-03-01 |
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| series | Applied Sciences |
| spelling | doaj.art-8e0bfe8026514be886db7bb69f51aa222024-03-27T13:19:06ZengMDPI AGApplied Sciences2076-34172024-03-01146225110.3390/app14062251A Transit Tilt and Offset Errors Calibration Method for Improving Laser Tracker Measurement Accuracy Based on the Telecentric Measurement SystemShan Wang0Zili Zhang1Dengfeng Dong2Tianci Feng3Qifan Qiu4Fanchang Meng5Guoming Wang6Chengjun Cui7Rongyi Ji8Yingling Pan9Tao Gong10Weihu Zhou11Institute of Microelectronics of the Chinese Academy of Sciences, Beijing 100029, ChinaInstitute of Microelectronics of the Chinese Academy of Sciences, Beijing 100029, ChinaInstitute of Microelectronics of the Chinese Academy of Sciences, Beijing 100029, ChinaSchool of Instrument and Optoelectronic Engineering, Beihang University, Beijing 100191, ChinaSchool of Automation Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, ChinaInstitute of Microelectronics of the Chinese Academy of Sciences, Beijing 100029, ChinaInstitute of Microelectronics of the Chinese Academy of Sciences, Beijing 100029, ChinaInstitute of Microelectronics of the Chinese Academy of Sciences, Beijing 100029, ChinaInstitute of Microelectronics of the Chinese Academy of Sciences, Beijing 100029, ChinaInstitute of Microelectronics of the Chinese Academy of Sciences, Beijing 100029, ChinaInstitute of Microelectronics of the Chinese Academy of Sciences, Beijing 100029, ChinaInstitute of Microelectronics of the Chinese Academy of Sciences, Beijing 100029, ChinaLaser trackers are instruments used to measure the three-dimensional coordinates of objects with high precision. It is necessary to study calibration methods to identify geometric errors of laser trackers so as to compensate for errors and improve measurement accuracy. Among the offsets, tilts, and eccentricity errors in the system, the transit tilt and offset errors play important roles and have an essential effect on the measurement accuracy, which need to be calibrated and compensated for. Current methods for detecting geometric errors between the transit and standing axes are complex and time-consuming. In this paper, a fast and novel calibration method is proposed, which can be easily operated with high precision. Two test rods are coaxially mounted on the ends of the transit axis to extend the hidden transit axis. Then, a telecentric measurement system is used to record the projection images of the test rods and identify the position of the transit axis. The transit offset and tilt errors were thus obtained by comparing the central axis positions of the two test rods before and after the standing axis rotated 180 degrees. Moreover, a numerical analysis method was proposed based on the least square circle fitting method to calibrate the installation eccentricity errors of the test rods. Experimental results verify that the measurement accuracy of the laser tracker can be improved after error compensation using the calibrated transit offset and tilt errors. The measurement error of the laser tracker can be reduced from 161 µm to about 73 µm after compensation at a distance of 5 m, while the error can be decreased from 143 µm to about 108 µm at a distance of 10 m.https://www.mdpi.com/2076-3417/14/6/2251transit offset errortransit tilt errorlaser trackercalibration method |
| spellingShingle | Shan Wang Zili Zhang Dengfeng Dong Tianci Feng Qifan Qiu Fanchang Meng Guoming Wang Chengjun Cui Rongyi Ji Yingling Pan Tao Gong Weihu Zhou A Transit Tilt and Offset Errors Calibration Method for Improving Laser Tracker Measurement Accuracy Based on the Telecentric Measurement System Applied Sciences transit offset error transit tilt error laser tracker calibration method |
| title | A Transit Tilt and Offset Errors Calibration Method for Improving Laser Tracker Measurement Accuracy Based on the Telecentric Measurement System |
| title_full | A Transit Tilt and Offset Errors Calibration Method for Improving Laser Tracker Measurement Accuracy Based on the Telecentric Measurement System |
| title_fullStr | A Transit Tilt and Offset Errors Calibration Method for Improving Laser Tracker Measurement Accuracy Based on the Telecentric Measurement System |
| title_full_unstemmed | A Transit Tilt and Offset Errors Calibration Method for Improving Laser Tracker Measurement Accuracy Based on the Telecentric Measurement System |
| title_short | A Transit Tilt and Offset Errors Calibration Method for Improving Laser Tracker Measurement Accuracy Based on the Telecentric Measurement System |
| title_sort | transit tilt and offset errors calibration method for improving laser tracker measurement accuracy based on the telecentric measurement system |
| topic | transit offset error transit tilt error laser tracker calibration method |
| url | https://www.mdpi.com/2076-3417/14/6/2251 |
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