Interference fading suppression method for φ-OTDR based on time-distance dual-domain phase differential
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Summary
This summary is machine-generated.A novel time-distance dual-domain phase differential (TDPD) method enhances phase-sensitive optical time-domain reflectometry (φ-OTDR) systems. TDPD effectively mitigates interference fading, improving signal-to-noise ratio for accurate vibration detection in optical fibers.
Area Of Science
- Optical Engineering
- Signal Processing
- Fiber Optic Sensing
Background
- Phase-sensitive optical time-domain reflectometry (φ-OTDR) systems are susceptible to interference fading.
- Fading, caused by phase randomness and environmental factors, degrades measurement accuracy.
- Existing methods struggle to address both noise- and vibration-induced fading simultaneously.
Purpose Of The Study
- To introduce a novel time-distance dual-domain phase differential (TDPD) method.
- To reconstruct constructive interference conditions in fading regions of φ-OTDR.
- To enhance the robustness and accuracy of phase demodulation in φ-OTDR systems.
Main Methods
- The time-distance dual-domain phase differential (TDPD) method utilizes distance-domain vector superposition to suppress noise-dominated fading.
- Time-domain differential phase processing eliminates vibration-induced fading by reducing inter-wave phase differences.
- Temporal-neighboring phase unwrapping and integration recover the original phase waveform.
Main Results
- Experimental validation on a 10 km fiber demonstrated accurate phase measurements for various vibrations (10 Hz, chirp, 0.1 Hz).
- The TDPD method achieved a signal-to-noise ratio (SNR) improvement of over 40 dB in vibration regions compared to conventional techniques.
- Simultaneous mitigation of both noise- and vibration-affected fading was successfully demonstrated.
Conclusions
- The TDPD method provides a reliable solution for precise phase demodulation in φ-OTDR.
- This cost-effective and computationally efficient framework significantly improves SNR and measurement accuracy.
- TDPD addresses key limitations in current φ-OTDR systems, enabling more robust fiber optic sensing.
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