The Birefringent Filter
MAY 01, 1949
DOI: 10.1063/1.3066514
The birefringent filter, invented in 1933 by Bernard Lyot, and independently in 1938 by Yngve Öhman, has been widely used in observing solar limb emission line phenomena which are ordinarily invisible because of the background of atmospheric and instrumental scattered light.
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© 1949 American Institute of Physics
