17 February 1997 Optical fiber sensors for monitoring visibility
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Accurate and reliable detection, discrimination, and quantitative measurement of visibility conditions will be crucial in the implementation of weather advisory schemes for Intelligent Transportation Systems. Increasing the amount of information about inclement weather to the motorist can greatly increase the levels of safety and mobility, reduce congestion, and enhance overall economic productivity. Typically, the number of visibility sensors that are deployed along the highway is limited due to their high-cost. Poor visibility conditions, however, are not uniform along the length of the highway, and it is therefore important that a larger number of low-cost and reliable sensors are deployed. Optical fiber sensors which possess unique advantages as compared to conventional electrical sensors may provide an interesting alternative to this problem.
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Vivek Arya, Vivek Arya, Paul Grems Duncan, Paul Grems Duncan, Marten J. de Vries, Marten J. de Vries, Richard O. Claus, Richard O. Claus, "Optical fiber sensors for monitoring visibility", Proc. SPIE 2902, Transportation Sensors and Controls: Collision Avoidance, Traffic Management, and ITS, (17 February 1997); doi: 10.1117/12.267147; https://doi.org/10.1117/12.267147

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