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Sub-nano resolution fiber-optic static strain sensor using a sideband interrogation technique.

Qingwen Liu1, Tomochika Tokunaga, Zuyuan He

  • 1Department of Electrical Engineering and Information Systems, The University of Tokyo, Tokyo, Japan.

Optics Letters
|February 3, 2012
PubMed
Summary
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We developed a new fiber-optic sensor using a novel sideband interrogation technique to measure minute static strain. This ultra-highly sensitive system achieves a resolution of 0.8 nε, ideal for geophysical research.

Area of Science:

  • Optoelectronics
  • Fiber Optics Sensing
  • Geophysical Instrumentation

Background:

  • Accurate measurement of static strain is crucial for geophysical applications.
  • Existing fiber-optic sensors face limitations in sensitivity and resolution for detecting subtle strain changes.
  • Optical resonators offer potential for high-precision measurements but require advanced interrogation techniques.

Purpose of the Study:

  • To propose and demonstrate a novel sideband interrogation technique for measuring resonance frequency differences in optical resonators.
  • To develop an ultra-highly sensitive fiber-optic static strain sensor system.
  • To achieve a high static strain resolution suitable for geophysical research.

Main Methods:

  • A novel sideband interrogation technique utilizing multiplex radio frequency intensity and phase modulation.

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Last Updated: May 25, 2026

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  • Development of a fiber-optic static strain sensor system employing a pair of identical fiber Fabry-Perot interferometers.
  • Implementation of a cross-correlation data processing algorithm for enhanced signal analysis.

    • Main Results:

    • Experimental demonstration of the novel sideband interrogation technique.
    • Successful construction of an ultra-highly sensitive fiber-optic static strain sensor.
    • Achieved a static strain resolution as low as 0.8 nε.

    Conclusions:

    • The proposed sideband interrogation technique enables precise measurement of resonance frequency differences.
    • The developed fiber-optic static strain sensor system exhibits ultra-high sensitivity and resolution.
    • The sensor system is a valuable tool for advanced geophysical research applications requiring precise strain monitoring.