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Sensors 2002, 2(6), 195-204; doi:10.3390/s20600195

Chemical detection in liquid media with a refractometric sensor based on a multimode optical fibre

1
Unité de Recherche de Physique des Semiconducteurs, IPEST, La Marsa, 2070 Tunis, Tunisia
2
IFOS, Ecole Centrale de Lyon, 36 Avenue Guy de Collongue, 69131 Ecully, France
3
Institute of Radio Engineering and Electronics, Academy of Sciences of the Czech Republic, Chaberska 57, 182 51 Prague 8, Czech Republic
*
Author to whom correspondence should be addressed.
Received: 10 May 2002 / Accepted: 30 May 2002 / Published: 20 June 2002
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Abstract

In this paper the physical basis for the design of an optical fibre sensor suited for aqueous medium and gas phase based on the excitation of an evanescent wave at the core/cladding interface is developed. The detection based on the refractive index changes (between 1.41 and 1.45) of the infinite dielectric medium which can be an electrolyte or a sol-gel polymer deposited on the uncladed part of the fibre. Refractive indices of absorbent and volatile compounds such as fuel and unleaded gas were determined. Using a xerogel sensing layer as optical cladding, toluene detection in water was performed. The observed sensitivity is linear and the detection limit is 1% (in volume) toluene in water. View Full-Text
Keywords: Optical fibre; Refractometer; Fuel control; Toluene detection Optical fibre; Refractometer; Fuel control; Toluene detection
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MDPI and ACS Style

Cherif, K.; Hleli, S.; Abdelghani, A.; Jaffrezic-Renault, N.; Matejec, V. Chemical detection in liquid media with a refractometric sensor based on a multimode optical fibre. Sensors 2002, 2, 195-204.

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