Abstract

Some properties of electron multiplier photo-tubes are investigated. The use of these tubes in quantitative spectrographic analysis is discussed, and a scheme for reducing the effect of the dark current is described. A sharply tuned electronic filter passing only the 120-cycle component of the signal is used to increase the signal to noise ratio. An amplifier circuit for measuring the intensity ratios of spectral lines is shown, and results from the application of this circuit to the analysis of chromium in steel are tabulated.

© 1947 Optical Society of America

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