High Precision Position Measurement Method for Laguerre-Gaussian Beams Using a Quadrant Detector

Autor: Qian Li, Jiabin Wu, Yunshan Chen, Jingyuan Wang, Shijie Gao, Zhiyong Wu
Jazyk: angličtina
Rok vydání: 2018
Předmět:
Zdroj: Sensors, Vol 18, Iss 11, p 4007 (2018)
Druh dokumentu: article
ISSN: 1424-8220
94814864
DOI: 10.3390/s18114007
Popis: In this paper, we propose a new method to improve the position measurement accuracy for Laguerre-Gaussian beams on a quadrant detector (QD). First, the error effects of the detector diameter and the gap size are taken into account, and the position error compensation factor is introduced into the conventional formula. Then, in order to reduce the number of parameters, the concept of effective radius is proposed. Thus, a new analytical expression is obtained with a best fit using the least square method. It is verified by simulation that this approach can reduce the maximum error by 97.4% when the beam radius is 0.95 mm; meanwhile, the root mean square errors under different radii are all less than 0.004 mm. The results of simulation show that the new method could effectively improve the accuracy of the QD measurement for different radii. Therefore, the new method would have a good prospect in the engineering practice of beam position measurements.
Databáze: Directory of Open Access Journals
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