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| A Detection Method for Positioning Accuracy of 3D Phantom System in Situ Based on Refraction Compensation of Laser Tracker |
| JI Zhen-chao1,LI Jia-fu2,DU Hua2,ZHU Xiao-ping2,ZHANG Hui2,YU Jing1 |
1. 中国计量大学 计量测试工程学院,浙江 杭州 310018
2. 中国计量科学研究院,北京 100029 |
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Abstract A detection method of the positioning accuracy of medical 3D phantom based on laser tracker refraction compensation is proposed, and the model of ADM and IFM ranging error compensation and space position coordinates solution of target ball is established, and theoretical model verification experiment and contrast experiment of 3D phantom positioning accuracy detection are carried out, and the high precision measurement of laser tracker in glass media is realized. The experimental results show that the average deviation of X, Y, and Z coordinates is respectively reduced from 3.410mm, 0.407mm, 1.732mm to 0.022mm, 0.015mm, 0.035mm, and the average deviation of the distance between adjacent points is reduced from 0.266mm to 0.017mm before and after compensation, which is equivalent to the measurement accuracy of the laser tracker in the air. On this basis, taking the suspension detection method without glass shielding as the reference, the positioning errors measured by the two methods are basically consistent. Finally, using Monte Carlo method, the standard uncertainty of the distance error between adjacent points is 0.012mm, which can meet the detection requirement.
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Received: 07 April 2021
Published: 14 October 2022
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2022, Vol. 43 
