Abstract
An electrically addressed, liquid crystal, fourier plane filter capable of real time optical image processing is described. The filter consists of two parts, a wedge filter having forty 9° segments and a ring filter having twenty concentric rings in a one inch diameter active area. Transmission of the filter in the off (transparent) state exceeds fifty percent. By using polarizing optics, contrast as high as 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">4</sup> :1 can be achieved at voltages compatible with FET switching technology. A phenomenological model for the dynamic scattering will be presented for this special case.
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