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Raman Spectroscopy Instrumentation: Overview01:26

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Related Experiment Video

Updated: Jul 5, 2025

Implementation of a Reference Interferometer for Nanodetection
16:11

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Low-Coherence Homodyne Interferometer for Sub-Megahertz Fiber Optic Sensor Readout.

Petr Volkov1, Andrey Lukyanov1, Alexander Goryunov1

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

Sensors (Basel, Switzerland)
|January 23, 2024
PubMed
Summary
This summary is machine-generated.

This study introduces a novel method for fiber optic sensor readouts using active homodyne demodulation and low-coherence interferometry. The technique achieves high sensitivity and stability for precise acoustic signal detection.

Keywords:
fiber optic sensorhomodyne demodulationlow-coherence interferometry

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Area of Science:

  • Optoelectronics and Sensor Technology
  • Interferometry
  • Fiber Optics

Background:

  • Interferometric fiber optic sensors offer high sensitivity but often face challenges in demodulation stability and bandwidth.
  • Active homodyne demodulation and low-coherence interferometry are established techniques with distinct advantages for signal processing.

Purpose of the Study:

  • To develop an advanced readout method for interferometric fiber optic sensors.
  • To enhance sensor performance by integrating active homodyne demodulation with low-coherence interferometry.
  • To achieve high sensitivity, stability, and a wide frequency band in sensor measurements.

Main Methods:

  • A tandem low-coherence interferometer was employed to modulate the reference interferometer independently of the sensing element.
  • Active homodyne demodulation was utilized for signal processing.
  • A fiber Michelson interferometer served as the sensing element for acoustic signal detection.

Main Results:

  • The proposed method demonstrated high sensitivity, achieving up to 0.1 nm (RMS).
  • The system maintained high stability across measurements.
  • A wide frequency band capability was achieved, demonstrated within a 5 kHz range.
  • Successful detection of acoustic signals was confirmed.

Conclusions:

  • The integration of active homodyne demodulation and low-coherence interferometry provides a robust method for fiber optic sensor readouts.
  • The technique significantly enhances sensitivity, stability, and operational bandwidth.
  • This approach is effective for precise acoustic signal detection using fiber optic sensors.