Tilted Fibre Bragg Gratings and Phase Sensitive-Optical Low Coherence Interferometry for refractometry and liquid level sensing

A. Obaton (1) , G. Laffont (2) , C. Wang (1) , A. Allard (1) , P. Ferdinand (2)

1 LNE - Laboratoire National de Métrologie et d'Essais [Trappes]
2 LCFO - Laboratoire Capteurs Fibres Optiques

A set-up based on an interferometric technique and including tilted Fibre Bragg Gratings has been used to provide refractive index and liquid level measurements. Such gratings have been investigated using the well-known Phase Sensitive-Optical Low Coherence Interferometry technique. This combination provides very promising refractometry sensing results, as the relative uncertainty on measurement is lower than 0.04% in the range 1.37–1.40 and shows a clear potential in liquid level sensing.

Keywords: Interferometry; Refractometry; Optical fibre sensor; Tilted Fibre Bragg Grating; Liquid level sensor; Optical Fiber Sensor; Tilted Fiber Bragg Grating

Domains: Engineering Sciences [physics]; Optics / Photonic; Physics [physics]; Physics [physics]; Instrumentation and Detectors [physics.ins-det]

A. Obaton, G. Laffont, C. Wang, A. Allard, P. Ferdinand. Tilted Fibre Bragg Gratings and Phase Sensitive-Optical Low Coherence Interferometry for refractometry and liquid level sensing. Sensors and Actuators A: Physical , 2013, 189, pp.451-458. ⟨10.1016/j.sna.2012.10.020⟩. ⟨cea-01815552⟩