UNDERWATER COMMUNICATION BY SCATTERED LIGHT
Abstract
Omnidirectional underwater voice communication by means of scattered light at ranges of 1,000 yards or more in clear ocean water appears to be possible with commercially available lamps and phototubes. Longer ranges, up to 1,750 yards, are possible with the same components if they are used in a 20 degree directional system. Still longer ranges are possible with more intense light sources. Technical evidence is presented in support of these possibilities and engineering equations are provided for the design of such optical communication systems. The equations show that scattered light penetrates ocean water much further than does non-scattered light, primarily because the attenuation coefficient for scattered light is (typically) about one-third of the attenuation coefficient for non-scattered light. Experimental data on the long-range propagation of scattered light from underwater sources is interpreted and extrapolated for engineering purposes. Data concerning the long-range transmission of polarized scattered light by natural waters is presented, and the role of polarization as a means for establishing multiple voice communication channels is discussed. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1963
- Accession Number
- AD0600917
Entities
People
- S. Q. Duntley