The interrogation and multiplexing of long period grating curvature sensors using a Bragg grating based, derivative spectroscopy technique

Abstract

A long period grating is interrogated with a fibre Bragg grating using a derivative spectroscopy technique. A quasi-linear relationship between the output of the sensing scheme and the curvature experienced by the long period grating is demonstrated, with a sensitivity of 5.05 m and with an average curvature resolution of 2.9 × 10-2 m-1. In addition, the feasibility of multiplexing an in-line series of long period gratings with this interrogation scheme is demonstrated with two pairs of fibre Bragg gratings and long period gratings. With this arrangement the cross-talk error between channels was less than ± 2.4 × 10-3 m-1.

Uncontrolled Keywords: long period grating, fibre Bragg grating, derivative spectroscopy technique, sensing scheme, curvature experienced
Published Date: 2004
Authors: Allsop, Thomas D.P.
Earthrowl, T.
Reeves, R.
Webb, David J.
Bennion, Ian

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