Abstract

The possibility of using photo-multipliers for the detection of the change in light intensity due to the absorption of free radicals in chemical reactions has been investigated. A discussion of the sensitivity of photo-tubes considers the effects of the random fluctuations of the photoelectric current, and the limitations due to the dark current and the fatigue of the tube. A balanced direct current circuit using two photo-multipliers is described. With this circuit, it is possible to detect a change of light intensity of 1 part in 10,000.

© 1950 Optical Society of America

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