Design of an optical sensor array for hydrocarbon monitoring |
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Authors: | F Prudenzano L Mescia L A Allegretti G Calò A D’Orazio M De Sario T Palmisano and V Petruzzelli |
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Institution: | (1) Dipartimento di Elettrotecnica ed Elettronica, Politecnico di Bari, Via E. Orabona, 4-70125 Bari, Italy;(2) Dipartimento di Ingegneria Civile e Ambientale, Politecnico di Bari, Via E. Orabona, 4-70125 Bari, Italy;(3) Dipartimento di Ingegneria dell'Ambiente e per lo Sviluppo Sostenibile, Politecnico di Bari, Via E. Orabona, 4-70125 Bari, Italy |
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Abstract: | Evanescent field optical sensors are accurately designed for hydrocarbon monitoring in water. Various kinds of waveguide sensors
are optimized by considering a polydimethylsiloxane polymeric overlay as sensor region. The simulation results suggest that
the selection of a suitable waveguide cross section can enhance the sensor performance. In particular, the hollow waveguide
sensor exhibits very intriguing performance, the absorbance being quite linear with respect to the contaminant concentration.
For the toluene pollution the absorbance exhibits a slope STEA = 2.52 ×10-2 ppm-1{S_{\rm TE}^{A} =2.52 \times 10^{-2}\,{\rm ppm}^{-1}} for a waveguide reference length L = 1.18 mm. In order to simultaneously detect different pollutants in water such as toluene, benzene, chlorobenzene and ethilbenzene,
an array of four miniaturized hollow waveguide sensors is designed. |
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