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Mid-range-UV-communications

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Mid range UV communications

Details

Inventors: Geller, Myer; Evanoff, Jr., George A.;
Assignee: The United States of America as represented by the Secretary of the Navy (Washington, DC)
Primary Examiner: Tarcza; Thomas H.
Assistant Examiner: Cain; David
Attorney, Agent or Firm: Fendelman; Harvey, Keough; Thomas Glenn

Mid-range communications are improved with a transmitter having an elongate omni-directionally radiating tube of UV energy that are focussed by a compound parabolic reflector to within a designated azimuth and/or elevation. The configuration of the reflector gives a broad beam directivity over a receiver target area to the exclusion of other bearings and elevations such that selected receiving stations can be designated between moving or unstable communication platforms, such as aircraft or ships. Because scattering occurs at angles larger than the direct beam, the requirement for accurate tracking mechanisms is further relaxed. Furthermore, these extra scattered photons increase the link distance. The need for very small divergence transmitters, like lasers, is eliminated permitting inexpensive, efficient UV lamps to be used with compound reflectors as transmitter sources.

DETAILED DESCRIPTION The present invention is directed to providing an apparatus for directing a UV beam of controlled divergence to assure mid-range communications in the solar-blind region of the ultraviolet spectrum.
An omni-directionally UV source, radiating in the tens of watts level, is contained at the convergence area of a parabolic reflector so that a UV beam of preselected divergence is transmitted in a controlled divergence beam.
A prime object of the invention is to provide for an apparatus for directing a controlled divergence beam of an omni-directional UV source.
Yet another object of the invention is to provide a UV communication system having the capability for selectively communicating with a receiver at a desired elevation and/or azimuth.
These and other objects of the invention will become more readily apparent from the ensuing specification and drawings when taken in conjunction with the appended claims.

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