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Self-Mixing Demodulation for Coherent Phase-Sensitive OTDR System.

Haijun He¹, Li-Yang Shao², Zonglei Li³

¹Center for Information Photonics & Communications, School of Information Science and Technology, Southwest Jiaotong University, Chengdu 610031, China. haijhe@163.com.

Sensors (Basel, Switzerland)

|May 18, 2016

Summary

This summary is machine-generated.

A new self-mixing demodulation method for coherent phase-sensitive optical time domain reflectometry (Ф-OTDR) enables real-time monitoring. This advancement achieves precise intrusion detection over long distances with high spatial resolution and broadband measurement capabilities.

Keywords:

fiber optics sensors optical time domain reflectometry remote sensing and sensors scattering measurement

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Area of Science:

Photonics and Optical Sensing
Fiber Optic Sensing Technology

Background:

Coherent phase-sensitive optical time domain reflectometry (Ф-OTDR) is crucial for simultaneous intrusion detection and localization.
Existing Ф-OTDR demodulation schemes struggle with real-time monitoring demands despite long-distance capabilities.

Purpose of the Study:

To introduce a novel, simple, and effective self-mixing demodulation method for coherent Ф-OTDR.
To overcome limitations of current methods and enable real-time monitoring.

Main Methods:

A self-mixing demodulation scheme was developed to process the beat signal in coherent Ф-OTDR.
The method eliminates the need for a local electrical oscillator and frequency locked loop.
Experiments were conducted on a 42.5 km fiber with induced vibrations.

Main Results:

Achieved a spatial resolution of 10 m.
Demonstrated a frequency response range from 8 Hz to 980 Hz.
Obtained precise localization with a signal-to-noise ratio of 21.4 dB.

Conclusions:

The self-mixing scheme effectively demodulates coherent Ф-OTDR signals.
This method enables real-time monitoring with high precision and broadband capabilities.
The technique offers a practical solution for advanced fiber optic sensing.