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

Sensors

K. Cherif¹  S. Hleli¹  A. Abdelghani¹  N. Jaffrezic-Renault² 

[1] Unité de Recherche de Physique des Semiconducteurs, IPEST, La Marsa, 2070 Tunis, Tunisia. Tel: [phone]. Fax: [phone].;IFOS, Ecole Centrale de Lyon, 36 Avenue Guy de Collongue, 69131 Ecully, France

关键词: Optical fibre;    Refractometer;    Fuel control;    Toluene detection;   

DOI  :  10.3390/s20600195

来源: mdpi

【 摘 要 】

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.

【 授权许可】

Unknown   
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