Abstract
MOST methods of heterochromatic photometry currently employed are based on dual optical systems, consisting of two beams of light which pass through appropriate filters and fall on two photo-cells. We have developed a method which uses a single beam of light and which appears to have certain advantages over these dual systems. The method has been developed primarily for internal standard flame photometry; but the principles may be of interest to workers in other fields. We wished to compare accurately the intensity of sodium radiation emitted from a flame with the intensity of lithium radiation emitted simultaneously. The wave-lengths involved were approximately 5900 A. and 6700 A.
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WALSH, E., WOLFF, H. Heterochromatic Photometry using Rotating Filters and a Colour Wedge. Nature 167, 683–684 (1951). https://doi.org/10.1038/167683b0
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DOI: https://doi.org/10.1038/167683b0
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