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Journal of Sensors
Volume 2014, Article ID 543530, 9 pages
http://dx.doi.org/10.1155/2014/543530
Research Article

Rain Sensor with Stacked Light Waveguide Having Tilted Air Gap

Department of Information and Telecommunication Engineering, Incheon National University, Incheon 406-772, Republic of Korea

Received 1 April 2014; Revised 4 June 2014; Accepted 5 June 2014; Published 26 June 2014

Academic Editor: Marco Consales

Copyright © 2014 Kyoo Nam Choi. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Vehicle sensor to detect rain drop on and above waveguide utilizing light deflection and scattering was realized, keeping wide sensing coverage and sensitivity to detect mist accumulation. Proposed sensor structure under stacked light wave guide consisted of light blocking fixture surrounding photodetector and adjacent light source. Tilted air gap between stacked light waveguide and light blocking fixture played major role to increase sensitivity and to enhance linearity. This sensor structure eliminated complex collimating optics, while keeping wide sensing coverage using simple geometry. Detection algorithm based on time-to-intensity transformation process was used to convert raining intensity into countable raining process. Experimental result inside simulated rain chamber showed distinct different response between light rain and normal rain. Application as automobile rain sensor is expected.