Underwater Visual Communication
U.S. Naval Medical Research Laboratory, 1960 - Underwater light - 18 pages
A preliminary survey was made of the value of using light in the blue range as a means for underwater communication. A discussion of the many factors involved is presented, as well as five examples of the combination of factors of transmission, emission, and sensitivity for a single layer of Continental Slope sea water of 66-foot depth, two types of illumination source, and sensitivity in daylight and in semi-darkness. There are certain advantages in using light from the blue and blue-green portion of the spectrum. These advantages increase as the absolute amount of blue light emitted by the source is increased, the distance the light must travel through the water is increased, and the lower the general illumination in the water happens to be.
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16 February 20 meters 60-5 UNDERWATER VISUAL 600 Wavelength absolute amount absorbed least Absorption of Light advantage increasing amount of blue amount of light blue and blue-green blue light emitted blue range blue-green portion blue-green region Continental Slope Daylight Fluorescent Lamp depth different wavelengths Dimmick distance the light distance through water emission factors of transmission fectiveness filter Force Medical Officer illumination source incandescent layer Light by Sea light must travel light source light transmitted means for underwater MEDICAL RESEARCH LABORATORY MEMORANDUM REPORT 60-5 Memorandum request meters of water NAVAL MEDICAL RESEARCH Ph.D Photopic Visibility Curve REPORT 60-5 UNDERWATER Scotopic Visibility selective transmission semi-darkness sensitivity in daylight show examples Slope sea water source is increased spectrum Submarine Transmission through 20 travel is increased Tungsten Source 2800 types of illumination underwater communication UNDERWATER VISUAL COMMUNICATION Visibility Curve 400 vision Visual Signal water is increased Wavelength 490 Wavelength 700 Figure Wavelength Figure