Research on the wire absolute position measurement technology of high accuracy in particle accelerator

doi:10.13474/j.cnki.11-2246.2019.0283

Abstract

Abstract: The vibration wire technique is recommended for accurate pre-alignment of the magnets on one same unit in particle accelerator. However, the position of vibration wire represented the magnetic center should figure out for the relative alignment between the different units. In order to obtain the absolute position of the wire, the method for getting the points and lines position by the close-range photogrametry technique is studied in this paper. The images are taken on multi-stations by single camera, and the calibration plate used for providing control points is taken to self-calibrate the camera by bundle adjustment method. It also puts forward a way to express the spatial line by two points and this makes the line resolving by bundle adjustment went easier. A test is carried out to measure the position of the line which is simulated by the two points on calibration plate, and the result showes that the accuracy of line position is better than 5 μm as compared with the theoretical values provided by the calibration plate. These confirm the correctness of the theory and method in this paper, and lays a foundation for the wire absolute position measurement with high accuracy.

Key words: photogrametry, spatial line, calibration plate, camera calibration, bundle adjustment

CLC Number:

P258

LIANG Jing, LUO Mingcheng, WANG Tong, DONG Lan, LUO Tao, KE Zhiyong, WANG Xiaolong. Research on the wire absolute position measurement technology of high accuracy in particle accelerator[J]. 测绘通报, 2019, 0(9): 44-50.

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