Abstract
DETratMINATION OF GRAIN SIZE DISTRIBUTION IN A SILVER EMULSIONAN APPLIED PROBLEM IN INVERSE OPTICSaJ. WANG and J.-Q. WANGInstitute of Modern OpticsNankai University, Tianjin, China1. INTRODUCTIONIn addition to the extensively- studied problems in inverse optics, such as inverse scatteringand phase reconstruction, there are some other problems that may be included in this field of study,the determination of grain size distribution in a silver emulsion is one of these.A microdensitometer is needed for the determination. The statistical properties of the emulsiontransmittance T(x,y) are derived from that of the combined transmittance Ta(x,y) of the emulsionwith the aperture function of the microdensitometer.2. PRINCIPLEFor a uniformly exposed and developed emulsion, the emulsion transmittance T(x,y) is the smoothrandom process of (x,y). When the emulsion transmittance is measured by a photodetector (say,microdensitometer) with the aperture function of
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