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Discrimination between strain and temperature effects using dual-wavelength fibre grating sensors

Discrimination between strain and temperature effects using dual-wavelength fibre grating sensors

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The spectral behaviour of two superimposed fibre gratings having different Bragg wavelengths (850 and 1300 nm) with respect to strain and temperature has been studied. The results show that the ratio of sensitivity at two Bragg wavelengths is dependent on strain and temperature, which can be used for simultaneous measurement of these parameters using a single sensing element.

Inspec keywords: sensitivity; strain gauges; diffraction gratings; fibre optic sensors

Other keywords: spectral behaviour; superimposed fibre gratings; Bragg wavelengths; temperature effects; 850 to 1300 nm; fibre optic sensors; strain effects; dual-wavelength fibre grating sensors; single sensing element

Subjects: Mechanical variables measurement; Fibre optic sensors; fibre gyros; Fibre optic sensors; Gratings, echelles; Fibre optics; Mechanical measurement methods and techniques for solids

References

    1. 1)
      • F. Farahi , D. J. Webb , J. D. C. Jones , D. A. Jackson . Simultaneous measurement of temperature and strain: cross-sensitivityconsiderations. J. Lightwave Technol. , 138 - 142
    2. 2)
      • M. G. Xu , J.-L. Archambault , L. Reekie , J. P. Dakin . Thermally-compensated bending gauge using surface-mounted fibre gratings. Int. J. Optoelectron.
    3. 3)
      • Flavin, D. A., McBride, R., Jones, J. D. C.: `Simultaneous measurement of temperature and strain by dispersive Fouriertransform spectroscopy', Proc. OFS'93, 1993, Florence, Italy, p. 333–336.
    4. 4)
      • Culshaw, B., Michie, C.: `Fibre optic strain and temperature measurement in composite materials- A review of the OSTIC programme', Proc. Int. Symp. on Advanced materials for lightwave structures,ESTEC, 1992, Noordwijk, The Netherlands, p. 393–398.
    5. 5)
      • Morey, W. W., Meltz, G., Welss, J. M.: `Evaluation of a fiber Bragg grating hydrostatic pressure sensor', PD-4.4, Proc. OFS'8, 1992, Monterey, USA, Postdeadline Paper.
    6. 6)
      • Morey, W. W., Meltz, G., Glenn, W. H.: `Fibre optic Bragg grating sensors', Proc. SPIE, 1989, 1169, p. 98–107.
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