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Barrales Guadarrama, R.; Mocholí Salcedo, A.; Rodríguez Rodríguez, M.; Barrales Guadarrame, VR.; Vázquez Cerón, ER. (2013). A new forward-scatter visibility sensor based on a universal frequency-to-digital converter. Instrumentation Science and Technology. 41:445-462. doi:10.1080/10739149.2013.780250. ACCEPTED MANUSCRIPT ACCEPTED MANUSCRIPT AbstractTraffic delays attributable to weather conditions may cause an increase in fuel consumption and then an increase in CO 2 emissions to the environment. Visibility reduction in roads due to dense fog is a main cause of traffic accidents and possible environmental pollution, hence the importance of deploying fog warning systems. In this paper, we present a forward-scatter visibility sensor that uses a quasi-digital photodetector and a universal frequency-to-digital converter instead of a conventional analog-to-digital converter as data acquisition system. This feature has allowed the design of a low cost, robust and simple sensor-to-microcontroller interface as demanded by Intelligent Transportation Systems (ITS) applications. An optical system to limit light interference is proposed. The visibilimeter was calibrated from a self-calibrated transmissometer using the same frequency-to-digital technique. This new instrument is capable of a 41 to 662.5 m visibility range detection and to transmit the information wirelessly to a 100 m distance.

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