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Fiber Bragg grating temperature sensor with controllable sensitivity.

J Jung1, H Nam, B Lee

  • 1School of Electrical Engineering, Seoul National University, Kwanak-Gu Shinlim-Dong, Seoul 151-742, Korea.

Applied Optics
|March 6, 2008
PubMed
Summary
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Researchers developed a fiber Bragg grating (FBG) sensor with adjustable sensitivity. By integrating metal strips with varying thermal expansion, they enhanced temperature sensitivity significantly compared to standard FBG sensors.

Area of Science:

  • Optoelectronics
  • Materials Science
  • Sensor Technology

Background:

  • Fiber Bragg Grating (FBG) sensors are widely used for measuring physical parameters.
  • Enhancing the sensitivity of FBG sensors, particularly to temperature, is crucial for advanced applications.
  • Controlling the sensitivity of FBG sensors often requires complex fabrication or additional components.

Purpose of the Study:

  • To demonstrate a novel method for controlling the temperature sensitivity of FBG sensors.
  • To improve the temperature sensitivity of FBG sensors by integrating dissimilar materials.
  • To provide a simple and effective approach for tunable FBG sensor sensitivity.

Main Methods:

  • A fiber Bragg grating (FBG) sensor was constructed by bonding two metal strips with different thermal expansion coefficients to the FBG.

Related Experiment Videos

  • The lengths of the metal strips were systematically varied to investigate their effect on sensor sensitivity.
  • The temperature response of the modified FBG sensor was experimentally characterized.

    • Main Results:

    • The integrated metal strips allowed for controllable adjustment of the FBG sensor's temperature sensitivity.
    • The temperature sensitivity of the modified FBG sensor was successfully enhanced by up to 3.3 times compared to a bare FBG.
    • The sensor design offers a straightforward way to tune sensitivity by altering the geometry of the metal strips.

    Conclusions:

    • A fiber Bragg grating (FBG) sensor with tunable temperature sensitivity has been successfully demonstrated.
    • The proposed method using dissimilar metal strips offers a simple and effective way to enhance FBG sensor performance.
    • This technique has potential applications in various fields requiring high-sensitivity temperature monitoring.