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20 November 1985 Design, Development, And Testing Of Two Prototype Maritime Laser Aids To Navigation
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Proceedings Volume 0540, Southwest Conf on Optics '85; (1985)
Event: 1985 Albuquerque Conferences on Optics, 1985, Albuquerque, United States
Under contract to the U.S. Coast Guard, Loral EOS (formerly Xerox EOS) designed and developed two prototype aids to navigation utilizing lasers as light sources. One prototype utilizes a Helium-Neon laser, beam expander, and rotating double-faceted reflector to provide a red flashing signal over a 3600 azimuthal field. The second unit utilizes a Helium-Neon and a Helium-Cadmium laser to provide dual-color signal information to guide mariners down a fairway or channel with great lateral precision. Two raw laser beams are expanded and passed through beamsplitters to produce four separate beams. Two beams are stationary and illuminate the starboard and port sides of the channel. The other two beams are directed onto counterrotating reflectors, producing time-coded, dual-color flashes that provide off-axis information to the mariner. Loral and Coast Guard personnel conducted extensive field tests of the units, identifying and overcoming mechanical and thermal problems. Tests involving several observers at long ranges indicated that "speckle" effects significantly enhanced signal conspicuity.
© (1985) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Paul F. Jacobs, Timothy S. Winslow, James D. Campbell, and Louis Reynolds "Design, Development, And Testing Of Two Prototype Maritime Laser Aids To Navigation", Proc. SPIE 0540, Southwest Conf on Optics '85, (20 November 1985);

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