A vacuum spectroscopic light source was developed which furnished a constant intensity emission line spectrum. Reproducibility was achieved by controlling with an oscilloscope the spark breakdown potential and the number of breakdowns per cycle of the applied high voltage. The gas composition in the source was found to be critically important. The constancy was checked photometrically and found to be about 2 percent.
© 1952 Optical Society of AmericaFull Article | PDF Article
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