A simple roll measurement method based on a rectangular-prism

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• 作者：Yusheng Zhai ; Qibo Feng ; ^{qbfeng@bjtu.edu.cn} ; Bin Zhang
• 关键词：Roll measurement ; Rectangular prism ; Laser collimation
• 刊名：Optics and Laser Technology
• 出版年：2012
• 出版时间：June 2012
• 年：2012
• 卷：44
• 期：4
• 页码：839-843
• 全文大小：504 K

文摘

A novel roll measurement method based on a rectangular-prism is presented. A collimated beam is normally incident upon a rectangular-prism with splitting film, and it is divided into two parts, the reflected and the transmitted beams. The displacements of the reflected and the transmitted beams are measured by two quadrant photoelectric detectors QD₁ and QD₂, respectively. The displacement change in the y-axis caused by roll can be measured with differential measurements from two quadrant photoelectric detectors. Theoretic analyses show that the crosstalk of straightness errors and yaw errors are avoided, and the crosstalk of the pitch ¦Á can be neglected by adopting differential measurements because the direction changes of the reflected and the transmitted beams are both double the changes of pitch. In this way, the stability for the roll measurement can be greatly enhanced. The systemic model is established and the feasibility of such a system is verified by theoretical analysis and experiments. The resolution of 0.3?and measurement accuracy of 2?can be obtained by the set-up measurement system.