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Related Experiment Video

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A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings

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Optimized localization algorithm of dual-Sagnac structure-based fiber optic distributed vibration sensing system.

Fei Teng, Duo Yi, Xueming Hong

|May 14, 2021

Summary

This summary is machine-generated.

This study introduces an optimized algorithm for fiber optic distributed vibration sensing systems. The new method enhances vibration localization accuracy, even with low signal-noise-ratio, and enables cost-effective multi-point sensing.

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Area of Science:

Optoelectronics
Fiber Optic Sensing
Signal Processing

Background:

Fiber optic distributed vibration sensing (DVS) systems are crucial for monitoring.
Traditional localization algorithms struggle with low signal-to-noise ratios (SNR) and multi-point scenarios.
Existing interferometric DVS systems often cannot retrieve multi-parameter vibration data.

Purpose of the Study:

To propose an optimized localization algorithm for dual-Sagnac structure-based fiber optic DVS.
To improve localization accuracy, especially for low SNR signals.
To enable cost-effective multi-point vibration localization and multi-parameter retrieval.

Main Methods:

Utilizing a dual-Sagnac structure for fiber optic distributed vibration sensing.
Applying the spectrum peak ratio of interference signals in the frequency domain for localization.
Employing a continuous low-coherence light source for multi-point sensing.
Developing a method for simultaneous retrieval of vibration position, frequency, and amplitude.

Main Results:

Achieved significantly improved localization accuracy for low SNR interference signals.
Successfully enabled multi-point vibration localization, reducing system costs.
Demonstrated simultaneous retrieval of vibration position, frequency, and amplitude.
Experimental maximum localization errors were 0.18% (single-point), 0.22% (multi-point, single-frequency), and 0.36% (multi-point, multi-frequency).

Conclusions:

The proposed optimized algorithm enhances the performance of fiber optic DVS systems.
The algorithm offers high-accuracy localization for various vibration scenarios, including complex multi-point and multi-frequency vibrations.
This advancement provides a cost-effective solution for advanced vibration monitoring applications.