Accession Number : AD0628991

Title :   SUBMARINE ILLUMINATION AND TELEVISION IN HARBOR WATER.

Descriptive Note : Final technical rept., Apr 63-Jun 65,

Corporate Author : NAVAL CIVIL ENGINEERING LAB PORT HUENEME CALIF

Personal Author(s) : Hitchcock,R. D.

Report Date : FEB 1966

Pagination or Media Count : 87

Abstract : A submersible closed-circuit television system was used to conduct a quantitative study of submarine illumination and vision in harbor water. The television camera is attached to a spread-U structure which holds a target jig and a pair of incandescent-light assemblies. The light assemblies are equipped with remotely controllable polarizers and employ 1,000-watt quartz-iodide lamps. Observations of various types of targets were made during daylight hours and at night. The effects of color filtering, polarization filtering, and off-axis illumination on detection range and resolution for the vidicon TV camera were determined. Theoretical calculations were confirmed. In harbor water with an attenuation length around 5 feet, color or polarization filtering provides no improvement in contrast or resolution. The seeing range for a vidicon camera, in this type of water, is generally less than 10 feet. The best resolution obtainable was 1/4 inch at 8.7 feet. A history and analysis of the performance of the underwater television system is included. Results are given of an experimental study of methods of constructing underwater lamp assemblies using tungsten-iodide bulbs. (Author)

Descriptors :   (*TELEVISION EQUIPMENT, SUBMARINES), (*SUBMARINES, TELEVISION EQUIPMENT), (*UNDERWATER, TELEVISION EQUIPMENT), (*HARBORS, UNDERWATER OBJECT LOCATORS), DETECTION, VISIBILITY, ILLUMINATION, LIGHTING EQUIPMENT, OPTICAL FILTERS, SUBMARINES, OPTICAL DETECTION

Subject Categories : Marine Engineering
      Optical Detection and Detectors
      Non-radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE