Abstract

A multiplier photo-tube is used in connection with a constant-deviation monochromator to determine the spectral energy distribution for sources having low brightness. The amplification in the tube itself gives high sensitivity without the use of multi-stage amplifier circuits, and slit widths can be made narrow enough to give accurate results for spectral distribution curves generally encountered. The spectral characteristics of two samples of fluorescent cloth are determined first, by using the photoelectric method and, secondly, by the use of a spectrograph with panchromatic plates. A comparison of the two methods is made, and the results are shown graphically by plotting the spectral distribution curves obtained in each case. The convenience, and sensitivity of the photoelectric method gives a marked advantage over the spectrographic method which requires long photographic exposures, and consequent density evaluations.

© 1947 Optical Society of America

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J. Opt. Soc. Am. 37(7) 554-557 (1947)

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