Spectral Transmission of Light through Seawater
Pacific-Sierra Research Corporation Warminster United States
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Proper design of a Lidar system for use in undersea warfare requires knowledge of the spectral transmission characteristics of seawater in the selection of laser wavelengths. In 1968 and 1974, N. G. Jerlov published spectral transmittance data for ten different types of seawater. In this technical memorandum, Jerlovs data are reworked and converted to graphs of attenuation length and attenuation coefficient as a functions of wavelength to permit interpolation of these functions for candidate Lidar wavelengths of 455, 486, 517, and 532 nm. For the clearest waters Jerlov types I, IA, IB, and II the two shorter wavelengths are preferred. The more turbid waters are somewhat more transparent at the longer wavelengths.