A VISIBILIMETER BASED ON A UNIVERSAL FREQUENCY-TO-DIGITAL CONVERTER

Autores UPV
Año
CONGRESO A VISIBILIMETER BASED ON A UNIVERSAL FREQUENCY-TO-DIGITAL CONVERTER

Abstract

In this paper, we present a forward-scatter visibilimeter that uses a quasi-digital photodetector and an universal frequency-to-digital converter instead of a conven-tional analog-to-digital converter as data acquisition system. This feature has al-lowed the design of a low cost, robust and simple sensor-to-microcontroller inter-face as demanded by Intelligent Transportation Systems (ITS) applications. An optical system to limit light interference is proposed. The visibilimeter was cali-brated from a self-calibrated transmissometer using the same frequency-to-digital technique. This new instrument is capable of 41.24 to 662.5 m visibility range de-tection and to transmit the information wirelessly to a 100 m distance.