Muping Song, Cong Yin, Yan Lu, Weiji Zhu, Ying Wu, Shouwang Zhuang. Four-Channel Detecting Phase Demodulation φ -OTDR Based on 3×3 Michelson Interferometer[J]. Acta Optica Sinica, 2018, 38(8): 0806001
- Acta Optica Sinica
- Vol. 38, Issue 8, 0806001 (2018)
Fig. 1. Sensing principle of four-channel detecting phase demodulation φ-OTDR based on 3×3 Michelson interferometer
Fig. 2. Scattering model of optical pulse
Fig. 3. Model of phase difference
Fig. 4. Diagram of demodulation principle
Fig. 5. Four-channel detecting phase demodulation system
Fig. 6. (a) Acquired three-channel signals E1, E2, E3 at 56 m; (b) comparison of E0 and calculated M, N
Fig. 7. Demodulation results under the unbalanced length of (a) 20 m, (b) 30 m, (c) 40 m, (d) 50 m
Fig. 8. Mean-subtracted signal of amplitude detection
Fig. 9. Relationship between demodulated phase and driven voltage of PZT
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