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Highly sensitive long-period fiber-grating strain sensor with low temperature sensitivity.

Yi-Ping Wang1, Limin Xiao, D N Wang

  • 1Department of Electrical Engineering, Hong Kong Polytechnic University, Hong Kong, China.

Optics Letters
|November 14, 2006
PubMed
Summary

A novel fiber-grating sensor demonstrates high strain sensitivity and low temperature sensitivity. This innovation minimizes temperature-induced strain errors without needing compensation, enhancing sensor accuracy.

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Area of Science:

  • Photonics
  • Fiber Optics
  • Sensor Technology

Background:

  • Fiber-grating sensors are crucial for measuring physical parameters.
  • Cross-sensitivity between strain and temperature often limits sensor accuracy.
  • Large-mode-area photonic crystal fibers offer unique sensing properties.

Purpose of the Study:

  • To fabricate a long-period fiber-grating sensor with high strain sensitivity.
  • To achieve low temperature sensitivity in the fabricated sensor.
  • To minimize temperature-induced strain errors without active compensation.

Main Methods:

  • Fabrication of a long-period fiber grating using a focused CO(2) laser.
  • Periodic groove carving on a large-mode-area photonic crystal fiber.

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  • Characterization of sensor response to strain and temperature variations.

    • Main Results:

    • Achieved high strain sensitivity of -7.6 pm/microepsilon.
    • Observed low temperature sensitivity of 3.91 pm/ degrees C.
    • Demonstrated a low temperature-induced strain error of 0.5 microepsilon/ degrees C without compensation.

    Conclusions:

    • The developed fiber-grating sensor effectively reduces strain-temperature cross-sensitivity.
    • The sensor's performance allows for accurate strain measurement even in fluctuating temperatures.
    • This technology offers a robust and uncompensated solution for strain sensing applications.