| 摘要 |
A device which eliminates unwanted light rays and permits passage of desired light rays. For the purposes of this specification, the desired light rays are those which originate on a first side of a material capable of effecting light passage, and which pass through the material to a second side. Undesirable light rays are those originating on the second side of the material, which pass through the material to the second side of the material. The material, in the embodiment illustrated, is a beam splitter intended to present a desired scene to an observer. The preferred embodiment includes a linear polarizer and a quarter wave retarder which impart an elliptical polarization to the undesired light rays. The polarizer and the retarder are arranged with respect to one another and to the beam splitter so that undesired light passing through the polarizer, retarder, and the beam splitter, and which is reflected back through the beam splitter to the polarizer will return, after reflection, with the same ellipticity but with orthogonal orientation. A method for determining the ratio components of light polarization when light is transmitted through a material, reflected and returned through the same material.
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