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Evanescent wave methane detection using optical fibres

Evanescent wave methane detection using optical fibres

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The optical detection of methane gas usually requires an open cell with light propagating through it as the detection system This implies the need for precise and, therefore, often expensive and delicate alignment optics. The Letter reports, for the first time, the use of a continuous optical fibre link as the absorption system, thereby obviating the need entirely for precision optics. The system uses a suitably designed section of D-fibre as the interaction mechanism. Initial experimental results indicate that resolutions in the region of 100 parts per million of methane should be achievable.

References

    1. 1)
      • Stewart, G., Muhammad, F.A., and Culshaw, B.: ‘Sensitivity improvement for evanescent wave gas sensors’, to be published in Sensors and Actuators.
    2. 2)
      • H. Tai , H. Tanaka , T. Yoshino . Fiber-optic evanescent-wave methane-gas sensor using optical absorption for the 3.392μm line of a He-Ne laser. Opt. Lett. , 6 , 437 - 439
    3. 3)
      • F.A. Muhammad , G. Stewart . Polarised finite difference analysis of D-fibre and application for chemical sensing. Int. J. Optoelectron. , 6 , 705 - 721
    4. 4)
      • J.P. Dakin , C.A. Wade , D. Pinchbeck , J.S. Wykes . A novel optical fibre methane sensor. J. Optical Sensors , 4 , 261 - 267
    5. 5)
      • C.A. Millar , B.J. Ainslie , M.C. Brierley , S.P. Craig . Fabrication and characterisation of D-fibres with a range of accurately controlled core/flat distances. Electron. Lett. , 6 , 322 - 323
    6. 6)
      • Stewart, G., Muhammad, F.A., Jin, W.: `Improvement in the sensitivity of evanescent wave gas sensors', Proc. Ist European Conference on Optical Chemical Sensors and Biosensors, 12–15 April 1992, Graz, Austria, p. 160.
    7. 7)
      • F.A. Muhammad , G. Stewart . D-shaped optical fibre design for methane gas sensing. Electron. Lett. , 13 , 1205 - 1206
    8. 8)
      • G. Stewart , J. Norris , D.F. Clark , B. Culshaw . Evanescent wave chemical sensors—a theoretical evaluation. Int. J. Optoelectron. , 34 , 227 - 238
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