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Humidity insensitive TOPAS polymer fiber Bragg grating sensor.

Wu Yuan1, Lutful Khan, David J Webb

  • 1DTU Fotonik, Dept. of Photonics Engineering, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark.

Optics Express
|October 15, 2011
PubMed
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Researchers developed a humidity-insensitive polymer optical fiber Bragg grating (FBG) using TOPAS. This new FBG technology significantly reduces humidity effects, improving sensing applications compared to traditional PMMA FBGs.

Area of Science:

  • Materials Science
  • Optical Engineering
  • Sensor Technology

Background:

  • Polymer optical fiber Bragg gratings (FBGs) are widely used in sensing applications.
  • Conventional poly (methyl methacrylate) (PMMA) FBGs exhibit significant sensitivity to humidity, limiting their performance in certain environments.
  • There is a need for humidity-insensitive optical fiber sensors.

Purpose of the Study:

  • To experimentally demonstrate a humidity-insensitive polymer optical fiber Bragg grating (FBG).
  • To record the first FBG in a TOPAS polymer optical fiber within the critical 850 nm spectral region.
  • To compare the humidity sensitivity of TOPAS FBGs with conventional PMMA FBGs.

Main Methods:

  • Fabrication of FBGs in single-mode microstructured polymer optical fibers made of TOPAS and PMMA.

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  • Recording FBGs with resonance wavelengths around 850 nm and 1550 nm.
  • Characterization of FBG performance under varying humidity conditions.

    • Main Results:

    • Successful experimental demonstration of a humidity-insensitive polymer optical fiber Bragg grating (FBG).
    • First FBG recorded in TOPAS polymer optical fiber in the 850 nm spectral region.
    • TOPAS FBGs showed over 50 times lower humidity sensitivity compared to PMMA FBGs at both 850 nm and 1550 nm.

    Conclusions:

    • TOPAS polymer optical fiber Bragg gratings offer a significant solution to the humidity sensitivity problem.
    • These humidity-insensitive FBGs are highly promising for advanced sensing applications.
    • The development opens new possibilities for reliable optical fiber sensing in diverse environmental conditions.