Narrow band rejection filter utilizing a liquid crystal cell

Details Narrow band rejection filter utilizing a liquid crystal cell Narrow band rejection filter utilizing a liquid crystal cell

1981-06-01

1984-04-24

Corbin, John K.

G02F 1137

Patent

active

044444699

ABSTRACT:
There is disclosed a method and apparatus for implementing a narrow band rejection filter utilizing a liquid crystal cell. A liquid crystal cell is positioned in the path of a light beam between a pair of crossed or parallel polarizers with the optical axis of the cell at a 45.degree. angle to the optical axes of the polarizers. A voltage is applied to the cell to tune the cell to reject a given wavelength and to pass other wavelengths. In order to reject the given wavelength and pass all other wavelengths, the order of the cell is stepped to maintain rejection of a fixed wavelength and the detected signal from the light passing through the cell is averaged.

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patent: 4272195 (1981-06-01), Kaye
Scheffer, "Liquid Crystal Color Displays", Nonemissive Electrooptic Displays 1975.
Armitage, D. "Liquid Crystal Voltage Controlled Retardation Display", vol. 19, No. 13, Jul. 1, 1980.

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