The airglow continuum in the immediate vicinity of the strong line emissions of the airglow is measured by introducing a second rotating polarizer to the birefringent filter. The results are compared with those obtained by other workers using different techniques. It is shown that the method would be useful for the study of the continuum in the immediate vicinity of the airglow.
B. S. Dandekar, "Measurements of the Airglow Continuum with a Birefringent Filter Photometer," Appl. Opt. 5, 835-838 (1966)