Infrared and Laser Engineering, Volume. 50, Issue 5, 20200437(2021)
Phase ambiguity and unwrapping of phase-sensitive optical time-domain reflectometer
Figures & Tables(9)
Fig. 3. Quadrant distribution diagram of , and in the period of , 和 在 周期内象限分布图
Fig. 4. (a) 200 curves of direct phase demodulation result; (b) Phase curves of eliminating initial phase interference; (c) Phase curves after first unwrapping; (d) Distance-time curves of phase difference
Fig. 5. (a) Distance-time curves of phase difference after second unwrapping; (b) Phase vs time curves of phase confusion position before and after second unwrapping; (c) Phase difference curves; (d) Phase vs time curves of before and after second unwrapping at 4 804 m
Fig. 6. (a)-(c) When 10, 800, 1500 Hz disturbance signals act respectively, phase vs time curves of before and after second unwrapping; (d) Spectrum diagram of system demodulation
Table 1. Specific implementation comparison table of value range expansion
View tableView in ArticleTable 1. Specific implementation comparison table of value range expansion
Region number in Fig.3 $\sin (\phi (t))$ $\cos (\phi (t))$ $\phi (t) \in ( - \pi ,\pi )$ ① <0 <0 $\arctan (Q/I) - \pi $ ② <0 >0 $\arctan (Q/I)$ ③ >0 >0 $\arctan (Q/I)$ ④ >0 <0 $\arctan (Q/I) + \pi $
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Miao Yu, Mingyang Sun, Yaolu Zhang, Yutong He, Zhifeng Zheng. Phase ambiguity and unwrapping of phase-sensitive optical time-domain reflectometer[J]. Infrared and Laser Engineering, 2021, 50(5): 20200437
Paper Information
Category: Optical communication and sensing
Received: Oct. 1, 2020
Accepted: --
Published Online: Aug. 13, 2021
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