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
- Infrared and Laser Engineering
- Vol. 50, Issue 5, 20200437 (2021)
Fig. 1. Sensing principle diagram of
传感原理图
Fig. 2. Experiment setup
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
Fig. 7. Phase change amplitude vs PZT driving voltage curve
Fig. 8. Phase difference response curves at 5 305 m and 9 815 m
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Table 1. Specific implementation comparison table of value range expansion
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