15 September 1995 Multiplexed optical fiber sensor system for use in monitoring ventilation in a highway tunnel
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Proceedings Volume 2507, Distributed and Multiplexed Fiber Optic Sensors V; (1995) https://doi.org/10.1117/12.219608
Event: European Symposium on Optics for Environmental and Public Safety, 1995, Munich, Germany
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.
© (1995) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Rosly Abdul Rahman, Rosly Abdul Rahman, Ramli Abu Hassan, Ramli Abu Hassan, Brian Culshaw, Brian Culshaw, Deepak G. Uttamchandani, Deepak G. Uttamchandani, } "Multiplexed optical fiber sensor system for use in monitoring ventilation in a highway tunnel", Proc. SPIE 2507, Distributed and Multiplexed Fiber Optic Sensors V, (15 September 1995); doi: 10.1117/12.219608; https://doi.org/10.1117/12.219608
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