The development chamber for an infrared, in-process densitometer, which will monitor and display a characteristic curve of a standard sensitometric strip during development, was designed. The monitoring radiation is to be emitted by a sequentially pulsed array of IR diodes (RCA SG1009A) and detected by an array of solid state detectors (UDT-450 Photodiode/Amplifier combination). The output of the detectors, corresponding to IR transmission, is to be scanned, electronically converted into density, and displayed. Electronic scanning assures that processes with subminute total development time can be monitored. Optical losses of the system were estimated, and a model of the optical system was built and tested. It was shown that the densitometer will be capable of monitoring in-process infrared transmittance corresponding to dry white light neutral density of at least 3.0. Technical drawings of the development chamber assembly and working drawings of the chamber components were prepared. The hydraulic flow of a processing solution was studied, including the specifying of a pump with suitable characteristics.

Library of Congress Subject Headings

Photographic optics; Photographic sensitometry; Photographic emulsions

Publication Date


Document Type


Department, Program, or Center

School of Photographic Arts and Sciences (CIAS)


Carson, John

Advisor/Committee Member

Schumann, G. W.


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