Abstract

The intensity of the astigmatic spectral image formed by a concave grating is a maximum at the center and drops off to zero at the ends of the line. Inasmuch as the intensity distribution can be known from the value of the astigmatism factor, G. H. Dieke has suggested using such an image as a means for calibrating a photographic plate in intensity measurements. It has been the purpose of this investigation to develop the method in detail, to apply it to the calculation of relative intensities, and to compare the results with those obtained from one or another of the standard methods now in use. Under proper conditions the astigmatism method has the great advantage of simplicity, and it was found to yield results which compare favorably with those obtained by other means.

© 1938 Optical Society of America

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