Temperature-insensitive strain measurement by broad-band interferometry

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Temperature-insensitive strain measurement by broad-band interferometry

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We report a technique for temperature-insensitive strain measurement by broad-band interferometry. Changes in group delay and dispersion in a Mach-Zehnder interferometer are measured by dispersive Fourier transform spectroscopy (DFTS). These measurements give values for strain and temperature via a well-conditioned matrix transformation, so that strain measurements are independent of temperature change. The technique can be used for remote interrogation of sensors by tandem interferometry. (6 pages)

Inspec keywords: strain measurement; strain sensors; Fourier transform spectroscopy; light interferometry; Mach-Zehnder interferometers; fibre optic sensors

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

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