Information transfer using thin transparent membranes.
Using a first order expression for the angular flux distribution of energy emitted by a phosphor, we are able to calculate the modulation transfer function of thin transparent membranes that are used for transferring images from the phosphor to photosensitive materials, such as photographic emulsions or photocathodes, where the phosphor and photographic emulsions or photocathodes are on opposite sides of the membrane. The loss in information in going through the membrane is due to the scattering and diffusion of light. This loss is shown to depend upon the angular distribution of light emitted by the phosphor, the degree of optical contact between the phosphor and membrane, the membrane thickness, and the ratio of the indexes of refraction of the membrane and phosphor. The results appear to be in good agreement with experiment.
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