(under subclass 321) Subject matter in which two beams of visible radiation are polarized and vary in intensity cyclically with time, and the two beams are out of phase with each other; and wherein the optical member is of the magneto-optical type, a controlled vibrating mirror, a wedge, or an iris.
(1) Note. Integrating spheres are generally part of the combination claimed.
(2) Note. Included in the combination claimed is an indicator or recorder to note the change necessary to cause equal brightness in each path.
SEE OR SEARCH THIS CLASS, SUBCLASS:
236, for integrating spheres, per se.
323+, for spectrophotometers with beam modulation, per se.
367+, for polarimeters generally which may involve plural beams and servo equalization of the light intensities of both beams.
SEE OR SEARCH CLASS 250, Radiant Energy,
228, for photo-electric optical or prephotocell systems which include integrating spheres.
