Experiments and error analysis of laser ranging based on frequency-sweep polarization modulation

Shuyuan Gao; Rongyi Ji; Yao Li; Zhi Cheng; Weihu Zhou

doi:10.1117/12.2247821

24 November 2016 Experiments and error analysis of laser ranging based on frequency-sweep polarization modulation

Shuyuan Gao, Rongyi Ji, Yao Li, Zhi Cheng, Weihu Zhou

Proceedings Volume 10023, Optical Metrology and Inspection for Industrial Applications IV; 1002322 (2016) https://doi.org/10.1117/12.2247821
Event: SPIE/COS Photonics Asia, 2016, Beijing, China

Abstract

Frequency-sweep polarization modulation ranging uses a polarization-modulated laser beam to determine the distance to the target, the modulation frequency is swept and frequency values are measured when transmitted and received signals are in phase, thus the distance can be calculated through these values. This method gets much higher theoretical measuring accuracy than phase difference method because of the prevention of phase measurement. However, actual accuracy of the system is limited since additional phase retardation occurs in the measuring optical path when optical elements are imperfectly processed and installed. In this paper, working principle of frequency sweep polarization modulation ranging method is analyzed, transmission model of polarization state in light path is built based on the theory of Jones Matrix, additional phase retardation of λ/4 wave plate and PBS, their impact on measuring performance is analyzed. Theoretical results show that wave plate’s azimuth error dominates the limitation of ranging accuracy. According to the system design index, element tolerance and error correcting method of system is proposed, ranging system is built and ranging experiment is performed. Experiential results show that with proposed tolerance, the system can satisfy the accuracy requirement. The present work has a guide value for further research about system design and error distribution.

Citation Download Citation

Shuyuan Gao, Rongyi Ji, Yao Li, Zhi Cheng, and Weihu Zhou "Experiments and error analysis of laser ranging based on frequency-sweep polarization modulation", Proc. SPIE 10023, Optical Metrology and Inspection for Industrial Applications IV, 1002322 (24 November 2016); https://doi.org/10.1117/12.2247821

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