A RECORDING GONIOMETRIC SPECTROPHOTOMETER
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Date
1952
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Publisher
Ohio State University
Abstract
For complex samples, the amount of radiation that is deviated by the sample from the direction of the direct beam is not readily calculated. This ``scattering'' also increases the effective optical path length within the sample, and in general absorbance is not directly proportional to sample thickness. To calculate radiation transfer through such a sample, it is necessary to know some ``scattering function'' as well as absorptivity for all wavelengths considered. An instrument has been constructed that allows a detector to be automatically scanned in circular arcs about the vertical axis through a sample, and manually moved in 10"" steps from the horizontal plane of the sample and direct beam to a position perpendicular to this plane. Part of the reflected scatter can be measured, with some three-eighth of the sphere about the sample being covered. This instrument will be described, together with certain calibration problems and preliminary data on the visible and near infrared scattering of human skin.
Description
Author Institution: Department of Physiology, Cornell University Medical College