Zhongjie Ren, Ke Cui, Jianxin Li, Rihong Zhu, Shaokun Deng. Michelson-Interferometer-Based All-Fiber Optical Perimeter Security System by Utilizing Binary Rectangular Pulse Phase Modulation[J]. Acta Optica Sinica, 2017, 37(12): 1206004
- Acta Optica Sinica
- Vol. 37, Issue 12, 1206004 (2017)
Fig. 1. Model of Michelson interferometer
Fig. 2. Specific structure of monitoring area
Fig. 3. Principle of phase demodulation
Fig. 4. (a) φm(t); (b) φm(t-τ); (c) Δφm; (d) relationship between output light intensity and the reference pulse
Fig. 5. Structure of FPGA-based interrogator controller
Fig. 6. Principle of time domain LC
Fig. 7. Overall structure of system prototype
Fig. 8. Scheme of data processing
Fig. 9. Photograph of monitoring area
Fig. 10. Demodulated signal in normal environment
Fig. 11. Phase changes under various external disturbances. (a) Kicking; (b) climbing; (c) knocking with iron bar; (d) digging holes
Fig. 12. Phase change under the interference of rains and snows
Fig. 13. Phase signal changes induced by different events
Fig. 14. NLC changes induced by different events
Fig. 15. Monitoring results in 2 min
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