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    Atmospheric Propagation Effects on a Laser Ship Mast Detector

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    Author
    Curtis, Harold O.
    Issue Date
    1975-10
    
    Metadata
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    Rights
    Copyright © International Foundation for Telemetering
    Collection Information
    Proceedings from the International Telemetering Conference are made available by the International Foundation for Telemetering and the University of Arizona Libraries. Visit http://www.telemetry.org/index.php/contact-us if you have questions about items in this collection.
    Publisher
    International Foundation for Telemetering
    Journal
    International Telemetering Conference Proceedings
    Abstract
    The performance of a laser gate ship mast detector is evaluated. The laser gate consists of transmitting optics and laser on one side of a shipping channel and receiving optics and detector on the other side of the channel. Expressions relating the probability of detection and the false alarm rate to laser power, noise, visibility or atmospheric attenuation of the beam are developed. Finally, at power levels meeting safety standards and for useful probabilities of detection and false alarm rates, the visibilities which limit system performance are determined as a function of laser gate path length. The gate, at visible wave lengths, will function at visibilities only slightly less than the path length. In the next step, the expected performance of the laser gate using a CO₂ laser radiating at 10.6μ in the infrared is analyzed. The extinction coefficient, which is only a fraction of that in the visible case, is estimated for poor visibility conditions (RVR = 1,000 ft.) from a combination of attenuation measurements relating attenuation to total water content and meterological results relating visibility to total water content. Then, for the infrared system, the same arguments as above are invoked and, in this case, it is shown that the infrared system will provide the required performance at much longer path lengths.
    Sponsors
    International Foundation for Telemetering
    ISSN
    0884-5123
    0074-9079
    Additional Links
    http://www.telemetry.org/
    Collections
    International Telemetering Conference Proceedings, Volume 11 (1975)

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