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Proceedings Paper

Multiplexed optical fiber sensor system for use in monitoring ventilation in a highway tunnel
Author(s): Rosly Abdul Rahman; Ramli Abu Hassan; Brian Culshaw; Deepak G. Uttamchandani
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Paper Abstract

In this paper, the design of an optical fiber system for the monitoring of ventilation in a high way tunnel is presented. It employs a star topology for the sensing of dust and CO, at four levels of concentrations, 1.0-4.0 mg/cm3 and 100-400 ppm, respectively. A wavelength demultiplexer (employing an interference filter) is used for distinguishing between the signals from the dust/CO subsystems. A time division multiplexing scheme utilizing a single pulse technique is employed in detecting the dust signals. In the CO subsystem, a switching protocol permits the detection of the optical PCM signals from the sensors. A wind speed/dual direction sensor is spatially multiplexed with the above subsystems. A fiber optic system with eight sensor lines representing the dust/CO subsystems together with a single wind sensor line has been proposed. A laboratory model with four sensor lines has been constructed, and results from preliminary evaluation of the system are given.

Paper Details

Date Published: 15 September 1995
PDF: 6 pages
Proc. SPIE 2507, Distributed and Multiplexed Fiber Optic Sensors V, (15 September 1995); doi: 10.1117/12.219608
Show Author Affiliations
Rosly Abdul Rahman, Univ. Teknologi Malaysia (Malaysia)
Ramli Abu Hassan, Univ. Teknologi Malaysia (Malaysia)
Brian Culshaw, Univ. of Strathclyde (United Kingdom)
Deepak G. Uttamchandani, Univ. of Strathclyde (United Kingdom)

Published in SPIE Proceedings Vol. 2507:
Distributed and Multiplexed Fiber Optic Sensors V
John P. Dakin; Alan D. Kersey, Editor(s)

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