Multiple Iterations of Bundle Adjustment for the Position Measurement of Fiber Tips on LAMOST
In the astronomical observation process of multi-object fiber spectroscopic telescope, the position measurement of fiber tips on the focal plane is difficult and critical, and is directly related to subsequent observation and ultimate data quality. The fibers should precisely align with the celestia...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Sciendo
2014-08-01
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| Series: | Measurement Science Review |
| Subjects: | |
| Online Access: | https://doi.org/10.2478/msr-2014-0026 |
| _version_ | 1818726413605273600 |
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| author | Feng Mingchi Gu Yonggang Jin Yi Zhai Chao |
| author_facet | Feng Mingchi Gu Yonggang Jin Yi Zhai Chao |
| author_sort | Feng Mingchi |
| collection | DOAJ |
| description | In the astronomical observation process of multi-object fiber spectroscopic telescope, the position measurement of fiber tips on the focal plane is difficult and critical, and is directly related to subsequent observation and ultimate data quality. The fibers should precisely align with the celestial target. Hence, the precise coordinates of the fiber tips are obligatory for tracking the celestial target. The accurate movement trajectories of the fiber tips on the focal surface of the telescope are the critical problem for the control of the fiber positioning mechanism. According to the special structure of the LAMOST telescope and the composition of the initial position error, this paper aims at developing a high precision and robust measurement method based on multiple iterations of bundle adjustment with a few control points. The measurement theory of the proposed methodology has been analyzed, and the measurement accuracy has been evaluated. The experimental results indicate that the new method is more accurate and more reliable than the polynomial fitting method. The maximum position error of the novel measurement algorithm of fiber tips with simulated and real data is 65.3 μm, and most of the position errors conform to the accuracy requirement (40 μm). |
| first_indexed | 2024-12-17T21:57:49Z |
| format | Article |
| id | doaj.art-03de64e43c0e4c1296715eb1f1a5ef70 |
| institution | Directory Open Access Journal |
| issn | 1335-8871 |
| language | English |
| last_indexed | 2024-12-17T21:57:49Z |
| publishDate | 2014-08-01 |
| publisher | Sciendo |
| record_format | Article |
| series | Measurement Science Review |
| spelling | doaj.art-03de64e43c0e4c1296715eb1f1a5ef702022-12-21T21:31:03ZengSciendoMeasurement Science Review1335-88712014-08-0114419019710.2478/msr-2014-0026msr-2014-0026Multiple Iterations of Bundle Adjustment for the Position Measurement of Fiber Tips on LAMOSTFeng Mingchi0Gu Yonggang1Jin Yi2Zhai Chao3Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, 230027, Hefei, ChinaExperimental Center of Engineering and Material Sciences, University of Science and Technology of China, 230027, Hefei, ChinaExperimental Center of Engineering and Material Sciences, University of Science and Technology of China, 230027, Hefei, ChinaExperimental Center of Engineering and Material Sciences, University of Science and Technology of China, 230027, Hefei, ChinaIn the astronomical observation process of multi-object fiber spectroscopic telescope, the position measurement of fiber tips on the focal plane is difficult and critical, and is directly related to subsequent observation and ultimate data quality. The fibers should precisely align with the celestial target. Hence, the precise coordinates of the fiber tips are obligatory for tracking the celestial target. The accurate movement trajectories of the fiber tips on the focal surface of the telescope are the critical problem for the control of the fiber positioning mechanism. According to the special structure of the LAMOST telescope and the composition of the initial position error, this paper aims at developing a high precision and robust measurement method based on multiple iterations of bundle adjustment with a few control points. The measurement theory of the proposed methodology has been analyzed, and the measurement accuracy has been evaluated. The experimental results indicate that the new method is more accurate and more reliable than the polynomial fitting method. The maximum position error of the novel measurement algorithm of fiber tips with simulated and real data is 65.3 μm, and most of the position errors conform to the accuracy requirement (40 μm).https://doi.org/10.2478/msr-2014-0026bundle adjustmentlamostmultiple iterationsposition errorposition measurement |
| spellingShingle | Feng Mingchi Gu Yonggang Jin Yi Zhai Chao Multiple Iterations of Bundle Adjustment for the Position Measurement of Fiber Tips on LAMOST Measurement Science Review bundle adjustment lamost multiple iterations position error position measurement |
| title | Multiple Iterations of Bundle Adjustment for the Position Measurement of Fiber Tips on LAMOST |
| title_full | Multiple Iterations of Bundle Adjustment for the Position Measurement of Fiber Tips on LAMOST |
| title_fullStr | Multiple Iterations of Bundle Adjustment for the Position Measurement of Fiber Tips on LAMOST |
| title_full_unstemmed | Multiple Iterations of Bundle Adjustment for the Position Measurement of Fiber Tips on LAMOST |
| title_short | Multiple Iterations of Bundle Adjustment for the Position Measurement of Fiber Tips on LAMOST |
| title_sort | multiple iterations of bundle adjustment for the position measurement of fiber tips on lamost |
| topic | bundle adjustment lamost multiple iterations position error position measurement |
| url | https://doi.org/10.2478/msr-2014-0026 |
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