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Method for measuring liquid phase diffusion based on tilted fiber Bragg grating.

Biqiang Jiang1, Jianlin Zhao, Chuan Qin

  • 1Shaanxi Key Laboratory of Optical Information Technology, Ministry of Education, School of Science, Northwestern Polytechnical University, Xi’an 710072, China.

Optics Letters
|November 4, 2011
PubMed
Summary
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This study introduces a novel method using tilted fiber Bragg gratings (TFBGs) to measure liquid diffusion. The technique enables remote and distributed concentration monitoring in challenging environments.

Area of Science:

  • Optics and Photonics
  • Materials Science
  • Chemical Engineering

Background:

  • Liquid phase diffusion is crucial in many chemical and industrial processes.
  • Accurate measurement of diffusion is essential for process optimization and control.
  • Traditional methods for diffusion measurement can be complex and limited in hostile environments.

Purpose of the Study:

  • To develop and demonstrate a novel, remote, and distributed method for measuring liquid phase diffusion.
  • To utilize tilted fiber Bragg gratings (TFBGs) for sensing diffusion processes.
  • To establish a calibration for relating spectral measurements to glycerol concentration.

Main Methods:

  • Employing a tilted fiber Bragg grating (TFBG) sensor.
  • Monitoring transmission spectra at various points within the diffusion zone.

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  • Calculating the normalized area of cladding mode envelopes.
  • Using experimental calibration formulas to determine glycerol concentration.

    • Main Results:

    • Successfully demonstrated the proposed method for measuring liquid phase diffusion.
    • Obtained glycerol concentration distribution curves based on spectral analysis.
    • Validated the correlation between normalized spectral area and glycerol concentration.

    Conclusions:

    • The TFBG-based method provides a convenient way to measure liquid phase diffusion.
    • The all-fiber structure allows for remote and distributed sensing.
    • This technique is suitable for monitoring diffusion in hostile environments.