Modulation transfer function of photographic emulsion: the small-angle approximation in radiative transfer theory.
The modulation transfer function (MTF) of photographic emulsion can be conveniently represented by an expression derived from the theory of radiative transfer. Small-angle scattering is assumed to simplify the transfer equation and a Gaussian model is used to represent the forward lobe of the scattering phase function. The MTF depends on such variables as emulsion thickness, crystal size and concentration, relative refractive index, and the wavelength of incident light. The experimental results show that the Gaussian model adequately represents the phase function and also that useful MTF predictions are possible in the spatial frequency bandwidth 0-40 cycles/mm for AgBr crystals in a gelatin matrix.
Benke
K K
KK
McKellar
B H
BH