Equipment for measurement of the granularity of photographic materials

摘要

The realized equipment for measurement of the granularity of black-and-white and colour photographic materials is based on low-speed rotation of the optically transmitting granularity sample and microphotometrical scanning of its image. The obtained electrical analogous signal is amplified and converted to the digital form by an analog-to-digital convertor and then processed by a special computer system. It is a modern digital-microphotometrical rotational granulometer with originally designed mechanical sample stage and electronical processing system which is useful for the laboratory practice. Its outputs consist of random optical transmittance data of the granularity sample under measurement, their mean value and dispersion.