A LOW COST FOG DETECTOR DEVELOPED FOR USE ON ROADS
A FOG DETECTOR OF THE SPLIT BEAM TRANSMISSOMETER TYPE IS DESCRIBED. TWO LIGHT BEAMS, DERIVED FROM A SINGLE MODULATED SOLID STATE SOURCE, ARE DETECTED AT THE ENDS OF TWO SEPARATE PATHS, ONE ENCLOSED AND ONE THROUGH THE ATMOSPHERE. THE OUTPUTS FROM THE DETECTORS ARE SWITCHED AND COMBINED IN SUCH A WAY THAT THE FINAL OUTPUT IS A DIRECT MEASURE OF THE ATTENUATION UNDERGONE BY THE FOG PATH BEAM, AND IS FREE FROM ZERO DRIFT, THE EFFECTS OF AMBIENT LIGHT ADMITTED INTO THE APPARATUS, AND PHOTO-DETECTOR LEAKAGE CURRENTS. /AUTHOR/
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Corporate Authors:
Transport and Road Research Laboratory (TRRL)
Wokingham, Berkshire United Kingdom -
Authors:
- Jeffery, D J
- Publication Date: 1972
Media Info
- Pagination: 24 p.
Subject/Index Terms
Filing Info
- Accession Number: 00222018
- Record Type: Publication
- Source Agency: National Technical Information Service
- Files: TRIS
- Created Date: Jul 17 1973 12:00AM