An infrared based electronic sensing and control system (costing $8,500) is described which involves sensors mounted 10 ft above ground. These measure backscatter and atmospheric attenuation to sense the reduced visibility. When visibility is reduced to less than 1,000 ft at one or more sensors, flashing warning signs are turned on at either side of the affected roadway interval. The sensors employ transistor and integrated circuitry to measure the backscatter and absorption of near infrared light energy. The sensor units are maintained at constant temperature to mimimize effects of snow and ice. The system powered at 110 volts can be adapted to use for dust detection or other phenomena that affect driver vision.

  • Corporate Authors:

    Dun Donnelley Publishing Corporation

    222 South Riverside Plaza
    Chicago, IL  United States  60606
  • Publication Date: 1973-5

Media Info

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Filing Info

  • Accession Number: 00260479
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Oct 11 1974 12:00AM