Fog detection by laser beam is being tested as a research project by the New Jersey Turnpike Authority. Fog is a frequent problem on the heavily traveled road, which crosses low-lying and marshy land. The first piece of laser equipment to be tested, made by International Laser Systems, Inc., Orlando, Fla., is expected to be placed about Jan. 15, along the meadowland route of the Turnpike. The system is also designed to detect snow, smoke, and blowing dust. The laser device would transmit data on visual range by cable to the turnpike headquarters, where the motorist could be alerted by the radio-controlled electric weather signs. The road already has changeable electric speed limit signs. Two other companies will each provide the turnpike with a system and all three will be evaluated. The laser instrument, called the Model VS-1 Visibility Sensor, measures the transmission of a laser beam through the atmosphere, using an eye-safe laser and an optical receiver. A built-in telescope on the transmitter allows an installer to sight quickly on the receiver. The receiver can then be quickly aligned by means of an integral strength indicator. The transmitter and receiver each stand 4 ft. high and are sealed against weather, dust, and vandalism. Self-contained heaters keep the windows clear during fog or snow. The laser transmitter emits a beam of light through the space being monitored to a receiver 250 ft. away. The unit being tested by the turnpike costs 3,200 dollars. /Article/

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    McGraw-Hill, Incorporated

    330 West 42nd Street
    New York, NY  United States  10036
  • Publication Date: 1974-12

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  • Accession Number: 00265256
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jan 16 1975 12:00AM