Instantaneous fringe-order identification using dual broadband sources with widely spaced wavelengths

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Instantaneous fringe-order identification using dual broadband sources with widely spaced wavelengths

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© The Institution of Electrical Engineers
Published

A new fringe-order identification technique for interferometric optical fibre sensors is described using dual broadband optical sources coupled with white-light interferometry. Compared with previous work, this technique enables the central (zero-order) fringe to be directly identified through its dominant amplitude, and does not require digitisation and its associated computing power. Therefore, it is suitable for coherence multiplexed quasidistributed sensors and for monitoring quickly varying measurands.

Inspec keywords: light interferometry; fibre optic sensors

Other keywords: interferometric optical fibre sensors; optical sources; white-light interferometry; dual broadband sources; fringe-order identification technique; quickly varying measurands; dominant amplitude; coherence multiplexed quasidistributed sensors

Subjects: Fibre optics; Optical interferometry; Fibre optic sensors; Fibre optic sensors; fibre gyros

References

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      • S. Chen , A.W. Palmer , K.T.V. Grattan , B.T. Meggitt . Digital processing techniques for electronically-scanned optical-fibre white-light interferometry. Appl. Opt. , 28 , 6003 - 6010
    2. 2)
      • Lefevre, H.C.: `White-light interferometry for optical fibre sensors', Proc. 7th Optical Fibre Sensors Conf., December 1990, Sydney, Australia, p. 345–352, ISBN 0909 394 245.
    3. 3)
      • S. Chen , A.W. Palmer , K.T.V. Grattan , B.T. Meggitt . An extrinsic optical-fibre interferometric sensor that uses multimode optical fibre: system and sensing head design for low noise operation. Opt. Lett. , 10 , 701 - 703
    4. 4)
      • Berkoff, T.A., Kersey, A.D.: `Dual wavelength interrogation of a fiber interferometer using a broadband source and fiber gratings', PD8, Post Deadline Proc. OFS'8, January 1992, Monterey.
    5. 5)
      • S. Chen , I.P. Giles . Optical coherence domain polarimetry: Intensity and interferometric type for quasi-distributed optical fibre sensors, SPIE Proc..
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