Abstract

The transmission of the birefringent filter is derived, and it is shown that the addition of a second rotating Polaroid to the conventional birefringent filter enables one to calibrate the birefringent photometer using a continuous source. The introduction of the second rotating Polaroid allows one to measure separately the line emission and the continuum in a spectral region where a single line is superimposed on a continuous background.

© 1965 Optical Society of America

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