Multiplexed optical fiber sensor system for use in monitoring ventilation in a highway tunnel

Rosly Abdul Rahman; Ramli Abu Hassan; Brian Culshaw; Deepak G. Uttamchandani

doi:10.1117/12.219608

15 September 1995 Multiplexed optical fiber sensor system for use in monitoring ventilation in a highway tunnel

Rosly Abdul Rahman, Ramli Abu Hassan, Brian Culshaw, Deepak G. Uttamchandani

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.

Citation Download Citation

Rosly Abdul Rahman, Ramli Abu Hassan, Brian Culshaw, and 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); https://doi.org/10.1117/12.219608

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KEYWORDS

Sensors

Signal detection

Optical fibers

Multiplexing

Switching

Fiber optics sensors

Demultiplexers

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