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Fringe order identification in optical fibre white-light interferometry using centroid algorithm method

Fringe order identification in optical fibre white-light interferometry using centroid algorithm method

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A special digital signal processing technique based on a centroid algorithm is presented. It is used to identify the central fringe from the output fringe pattern produced by an optical fibre white-light interferometer system to achieve a large-dynamic-range and absolute phase measurement. A computer simulation and subsequent experimental verification have shown that this technqiue is capable of sustaining a high operating noise level.

Inspec keywords: optical fibres; fibre optic sensors; light interferometry; phase measurement; signal processing; identification

Other keywords: fringe order identification; output fringe pattern; centroid algorithm method; computer simulation; optical fibre; digital signal processing; absolute phase measurement; white-light interferometry; dynamic-range; adaptive filtering

Subjects: Signal processing and detection; Fibre optic sensors; Optical interferometry; Fibre optics; Fibre optic sensors; fibre gyros

References

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      • Lefevre, H.C.: `White-light interferometry for optical fibre sensors', Proc. OFS'7, Sydney, Australia, Pub. IREE, p. 345–352, 0-909-384-24-5.
    2. 2)
      • Chen, S., Meggitt, B.T., Rogers, A.J.: `Large-dynamic range electronically-scanned “white-light” interferometer with optical fibre Young's structure', Proc. Int. Conf. on Optical Fibre Sensors, March 1991, The Hague, 1511, p. 67–77, SPIE Proceedings.
    3. 3)
      • Y. Ning , K.T.V. Grattan , B.T. Meggitt , A.W. Palmer . Characteristics of laser diodes for interferometric use. Appl. Opt. , 17 , 3657 - 3661
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      • S. Chen , B.T. Meggitt , A.J. Rogers . A novel electronic scanner for coherence multiplexing in a quasidistributcd pressure sensor. Electron. Lett. , 17 , 1367 - 1369
    5. 5)
      • Bosselman, TH., Ulrich, R.: `High-accuracy fiber-optic reflectometer for fluids', Proc. OFS'7, December 1990, Sydney, Australia, Pub. IREE, p. 353–356, 0-909-384-24-5.
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Erratum: Fringe order identification in optical fibre white-light interferometry using centroid algorithm method
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