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Tunable Fabry-Perot-resonator-based fiber-optic white-light interferometric sensor array.

Libo Yuan1, Jun Yang

  • 1Photonics Research Center, College of Science, Harbin Engineering University, Harbin, China. lbyuan@vip.sina.com

Optics Letters
|August 19, 2008
PubMed
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A novel fiber-optic sensing system uses a tunable Fabry-Perot resonator for absolute length measurements in remote sensor arrays. This system is ideal for monitoring strain distribution and deformation in smart structures.

Area of Science:

  • Optoelectronics
  • Fiber Optics
  • Sensor Technology

Background:

  • Quasi-distributed sensing systems are crucial for structural health monitoring.
  • Existing systems face challenges in absolute length measurement and multiplexing.
  • Fabry-Perot resonators offer precise optical measurements.

Purpose of the Study:

  • To propose and demonstrate a tunable Fabry-Perot-resonator-based fiber-optic white-light interferometric sensing system.
  • To enable absolute length measurement in a remote reflective sensor array.
  • To evaluate the multiplexing potential for strain distribution measurement.

Main Methods:

  • Utilized a tunable Fabry-Perot resonator within a white-light interferometric system.
  • Developed a quasi-distributed sensing architecture with a reflective sensor array.

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  • Analyzed sensor reflective signal characteristics and intensity-number relationships.

    • Main Results:

    • Successfully demonstrated a four-sensor array system.
    • Established the relationship between light signal intensities and the number of sensors.
    • Validated the system's capability for absolute length measurement.

    Conclusions:

    • The proposed fiber-optic sensing system effectively enables absolute length measurement.
    • The system shows significant potential for strain distribution and deformation sensing in smart structures.
    • The analysis provides a basis for optimizing multiplexing in quasi-distributed fiber-optic sensor networks.