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A Method for Improving the Detection Accuracy of the Spot Position of the Four-Quadrant Detector in a Free Space Optical Communication System
Wang, Xuan1,2,3; Su, Xiuqin1; Liu, Guizhong2; Han, Junfeng1,3; Wang, Kaidi1; Zhu, Wenhua1,3
作者部门光电跟踪与测量技术研究室
2020-12
发表期刊SENSORS
ISSN1424-8220
卷号20期号:24
产权排序1
摘要

In a free space optical communication system, the beacon light will lose most of its energy after long-distance transmission, and the background light from the universe will strongly interfere with it. The four-quadrant detector (4QD) has been widely used in optical communication systems as a high-precision spot position detection sensor. However, if the light signal falling on the 4QD is too weak, the electrical signal of the output position will be very weak, and it will easily be affected by or even submerged in noise. To solve this problem, we propose a method for improving the spot position detection accuracy. First, we analyzed the solution relationship between the actual position of the spot and the output signal of the 4QD, with a Gaussian spot as the incident light model. The output current signal of the detector was then transimpedance-amplified by an analog circuit and the output voltage signal with noise was digitally filtered. An error compensation factor and the gap size of the detector were introduced into the traditional spot position detection model. High-precision spot position information for the 4QD in a complex environment was then obtained using the improved spot position detection model. Experimental results show that the maximum spot position detection error for this method was only 0.0277 mm, and the root mean square error was 0.0065 mm, when the 4QD was in a high background noise environment. The spot position detection accuracy was significantly improved compared with traditional detection algorithms. Real-time detection can therefore be achieved in practical applications.

关键词quadrant detectors Gaussian spot high background noise
DOI10.3390/s20247164
收录类别SCI
语种英语
WOS记录号WOS:000603200300001
出版者MDPI
引用统计
被引频次:5[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.opt.ac.cn/handle/181661/94254
专题光电跟踪与测量技术研究室
通讯作者Wang, Xuan
作者单位1.Chinese Acad Sci, Xian Inst Opt & Precis Mech, Xian 710119, Peoples R China
2.Xi An Jiao Tong Univ, Sch Elect & Informat Engn, Xian 710049, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式
GB/T 7714
Wang, Xuan,Su, Xiuqin,Liu, Guizhong,et al. A Method for Improving the Detection Accuracy of the Spot Position of the Four-Quadrant Detector in a Free Space Optical Communication System[J]. SENSORS,2020,20(24).
APA Wang, Xuan,Su, Xiuqin,Liu, Guizhong,Han, Junfeng,Wang, Kaidi,&Zhu, Wenhua.(2020).A Method for Improving the Detection Accuracy of the Spot Position of the Four-Quadrant Detector in a Free Space Optical Communication System.SENSORS,20(24).
MLA Wang, Xuan,et al."A Method for Improving the Detection Accuracy of the Spot Position of the Four-Quadrant Detector in a Free Space Optical Communication System".SENSORS 20.24(2020).
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