Discrimination between strain and temperature effects using first and second-order diffraction from a long period grating


We study the effects of temperature and strain on the spectra of the first and second-order diffraction attenuation bands of a single long-period grating (LPG) in step-index fibre. The primary and second-order attenuation bands had comparable strength with the second-order bands appearing in the visible and near-infra red parts of the spectrum. Using first and second-order diffraction to the eighth cladding mode a sensitivity matrix was obtained with limiting accuracy given by cross-sensitivity of ~1.19% of the measurement. The sensing scheme presented as a limiting temperature and strain resolution of ±0.7 °C and ~±25 µ.

Uncontrolled Keywords: long-period fibre grating, strain and temperature sensing, second-order diffraction
Published Date: 2002-10-01
Authors: Allsop, Thomas D.P.
Zhang, Lin
Webb, David J.
Bennion, Ian


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