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Differential strain measurement using multiplexed fiber Bragg grating sensors.

Peter G LoPresti1, Dilip Jali, Christopher Shrock

  • 1Department of Electrical Engineering, University of Tulsa, 600 South College Avenue, Tulsa, Oklahoma 74104-3189, USA. pgl@ohm.ee.utulsa.edu

ISA Transactions
|April 22, 2004
PubMed
Summary

Differential measurement using fiber Bragg gratings improves strain resolution by 34% despite noise. This technique, combined with spatial demultiplexing, offers high-resolution sensing and shows promise for oil-water boundary detection.

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Area of Science:

  • Optical sensing technologies
  • Fiber optic sensors
  • Strain measurement

Background:

  • Fiber Bragg gratings (FBGs) are widely used for strain sensing.
  • Absolute wavelength measurements can be susceptible to noise, limiting strain resolution.
  • Accurate strain measurement is crucial in various industrial applications.

Purpose of the Study:

  • To investigate differential measurement of strain using FBGs.
  • To evaluate the effectiveness of spatial demultiplexing for high-resolution FBG sensing.
  • To apply and assess the differential FBG technique for oil-water boundary detection.

Main Methods:

  • Implementing differential measurement of Bragg wavelengths from FBGs.
  • Utilizing spatial demultiplexing to identify individual gratings.

Related Experiment Videos

  • Comparing differential strain measurements against absolute measurements.
  • Testing the differential technique in an oil-water boundary detection scenario.

    • Main Results:

    • Differential measurement improved strain resolution by an average of 34% compared to absolute measurements.
    • Spatial demultiplexing enabled high-resolution sensing without explicit wavelength calculation.
    • The differential method demonstrated temperature dependency.
    • Preliminary results for oil-water boundary detection were promising.

    Conclusions:

    • Differential measurement offers a significant improvement in strain resolution for FBG sensors, especially in noisy environments.
    • Spatial demultiplexing is a viable method for enhancing FBG sensing capabilities.
    • Further research is needed to address the temperature dependency of the differential method.
    • The differential FBG technique shows potential for practical applications like interface detection in production columns.