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Fiber Optic Impact Location System Based on a Tracking Tandem Low-Coherence Interferometer.

Petr Volkov1, Andrey Lukyanov1, Alexander Goryunov1

  • 1The Institute for Physics of Microstructures RAS, Academicheskaya Str. 7, 603087 Afonino, Nizhny Novgorod Region, Russia.

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Summary
This summary is machine-generated.

This study introduces a novel fiber-optic sensor (FOS) method using a tandem interferometer to detect minute fluctuations. It achieves high sensitivity and accurate 2D acoustic signal localization, compensating for environmental drifts.

Keywords:
Fabry–Pérot interferometeracoustic emissionfiber optic sensor

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Area of Science:

  • Optics and Photonics
  • Sensor Technology
  • Signal Processing

Background:

  • Fiber-optic sensors (FOS) are crucial for various monitoring applications.
  • Existing FOS methods face challenges with temperature and deformation drifts, limiting sensitivity.
  • Accurate detection of small-length fluctuations is essential for advanced sensing.

Purpose of the Study:

  • To develop a robust method for detecting small-length fluctuations in FOS.
  • To compensate for temperature and deformation drifts in FOS systems.
  • To demonstrate high sensitivity and precise localization capabilities of the proposed FOS method.

Main Methods:

  • Implementation of a tracking tandem low-coherence interferometer.
  • Development of signal processing algorithms, including the time reversal method.
  • Experimental validation using 2D acoustic signal localization.

Main Results:

  • Achieved high sensitivity of 2 nm within a 200 kHz frequency range.
  • Demonstrated constant high sensitivity across a wide frequency band.
  • Accurate 2D localization of acoustic impact points with approximately 2 cm accuracy using a single sensor.

Conclusions:

  • The proposed tandem interferometer method effectively detects small-length fluctuations in FOS.
  • The system successfully compensates for environmental drifts, ensuring reliable sensor performance.
  • The method offers a promising solution for precise 2D acoustic signal localization with minimal sensors.