This project was to design and operate an infrared scanning densitometer to monitor the growth of the characteristic curve of a film during development. An aparatus was constructed which enabled us to pass repeatedly, a sensitometric strip through a beam of radiation during development. This radiation was focused on the film plane of the development container. The spot on the film plane was relayed, after transmission through the sample, to a photomultiplier tube. The response of the tube was displayed an oscilloscope and this was photographed. We were able to obtain a trace of the characteristic curve of a fully processed snesitometric strip in the above manner. However, we were unable to obtain the characteristic curve of a test strip during development even with the antihalation dyes removed. We believe that if more time were available we would go to radiation of higher Intensity and longer wavelength, with an appropriate change in photomultiplier tube. It is our opinion that with these changes we would have had success.

Library of Congress Subject Headings

Photographic sensitometry

Publication Date


Document Type

Senior Project

Student Type


Department, Program, or Center

School of Photographic Arts and Sciences (CIAS)


Schumann, G. W.


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