Accession Number : AD0509730

Title :   Some Preliminary Measurements on the Transmission of Light Signals from a Submarine to an Aircraft.

Descriptive Note : Interim rept.,

Corporate Author : NAVAL RESEARCH LAB WASHINGTON D C

Personal Author(s) : Stamm,G. L. ; Plymale,W. S. , Jr

Report Date : 19 JUN 1957

Pagination or Media Count : 17

Abstract : How refraction at the sea surface would affect the peripherally detected light rays and the light-pulse beam is shown. Had the sea been perfectly smooth, the peripherally detected rays emitted upward from the submerged transmitter would have been incident at the sea surface at an angle of about 41 degrees. This angle is very close to the critical angle of approximately 48 degrees for sea water where all the light would have been reflected back into the sea. The procedure followed, and the difficulties encountered, in coordinating the movements of the submarine and the aircraft are discussed. Possible improvements of both the experimental procedure and the equipment are suggested. One major source of experimental error might be eliminated by having the position of the submerged submarine defined by a light so that positive visual location by the aircraft pilot could be assured.

Descriptors :   (*SIGNAL LIGHTS, UNDERWATER TO AIR), OPTICAL COMMUNICATIONS, SUBMARINES, AIRPLANES, PATROL AIRCRAFT, SEA WATER, UNDERWATER LIGHTS, LIGHT TRANSMISSION, VISUAL SIGNALS, PERFORMANCE(HUMAN), HUMAN FACTORS ENGINEERING

Subject Categories : Non-radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE