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Time-division-multiplexed optical fibre strain-sensor using subcarrier interferometry

Time-division-multiplexed optical fibre strain-sensor using subcarrier interferometry

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Published

A high-resolution quasi-distributed strain sensor employing subcarrier interferometry and time-division multiplexing is reported. The system tracks a null in the subcarrier frequency response of a fibre network containing reflective discontinuities. Time gating selects the sensing section. A resolution better than 20 µm over 5 m lengths of fibre has been obtained.

Inspec keywords: strain sensors; light interferometry; time division multiplexing; subcarrier multiplexing; fibre optic sensors

Other keywords: 20 micron; time gating; subcarrier interferometry; frequency response; high-resolution quasi-distributed sensor; fibre network; optical fibre strain-sensor; time-division-multiplexing; reflective discontinuities; 5 m

Subjects: Measurement of mechanical variables; Fibre optic sensors; fibre gyros; Optical interferometry; Fibre optic sensors; Mechanical variables measurement

References

    1. 1)
      • C.E. Lee , R.A. Atkins , H.F. Taylor . Reflectively tapped optical fibre transversal filters. Electron. Lett. , 11 , 596 - 598
    2. 2)
      • Wade, C.A., Dakin, J.P., Croft, J., Wright, J.: `Optical fibre displacement sensor based on electrical subcarrier interferometryusing a Mach-Zehnder configuration', Conf. Fibre Optic Sensors, 1985, 586SPIE, Cannes, France, .
    3. 3)
      • J. Nakayama , K. Lizuka , J. Nielsen . Optical fiber fault locator by the step frequency method. Appl. Opt. , 3 , 440 - 443
    4. 4)
      • R.I. Macdonald . Frequency domain optical reflectometer. Appl. Opt. , 10 , 1840 - 1844
    5. 5)
      • Davis, M.A., Kersey, A.D., Berkoff, T.A., Bellemore, D.G.: `Subcarrier based path-integrating strain sensor array utilising fiberBragg gratings', Conf. Distributed and Multiplexed Fibre Optic Sensors, 1994, 2294, SPIE, San Diego, CA, USA, p. 93–99.
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