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Simultaneous independent temperature and strain measurement using in-fibre Bragg grating sensors

Simultaneous independent temperature and strain measurement using in-fibre Bragg grating sensors

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Published

A new technique for the simultaneous, independent measurement of temperature and strain using in-fibre Bragg grating sensors is proposed and demonstrated. Two Bragg gratings with closely spaced centre wavelengths are written either side of a splice between two fibres of different diameter. The gratings show similar temperature sensitivities but different strain responses to an applied stress. Maximum errors of ±17 µɛ and ±1° are reported over 2500 µɛ and 120°C measurement ranges.

Inspec keywords: temperature measurement; diffraction gratings; fibre optic sensors; strain measurement

Other keywords: temperature measurement; temperature sensitivities; in-fibre Bragg grating sensors; strain measurement; closely spaced centre wavelengths; strain responses

Subjects: Fibre optic sensors; Mechanical variables measurement; Thermometry; Gratings, echelles; Thermal variables measurement; Fibre optic sensors; fibre gyros; Measurement of mechanical variables; Mechanical instruments, equipment, and techniques

References

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