Measurement of Absorption Coefficients of Water in the Visible Spectral Region (Phase I and II).

摘要

The attenuation coefficient of deionized filtered water was measured in the wave-length regions 418-640nm and 660-695nm. A tunable dye laser provided a source of quasimonochromatic electromagnetic radiation. The data were collected by use of a split laser beam, a reference and sample cell,detector,dual channel boxcar integrator, A-D converter and 9820Hewlett-Packard calculator. Rayleigh scattering coefficients for local density fluctuations within the liquid were computed in the region 418-640nm attenuation coefficient,thus providing the sum of the absorption coefficient and the scattering coefficients caused by microscopic particles suspended in the liquid. Values obtained for attenuation coefficients were compared with attenuation coefficients or absorption coefficients from previous investigations of ocean water,deionized filtered water,and distilled water. Specific comparisons of attenuation coefficients were made with absorption coefficient data obtained by adiabatic laser calorimetry. Attenuation coefficients in the region 660-695nm are presented graphically.