Liquid crystal device for calibration and testing of optical...

Details Liquid crystal device for calibration and testing of optical... Liquid crystal device for calibration and testing of optical...

G - Physics

01

J

G01J 1/02 (2006.01) G01N 21/27 (2006.01)

Patent

CA 2072742

2072742 9108452 PCTABS00005 A device and method for optical calibration of an optical instrument (12) that measures optical characteristics along an optical path. A controllable shutter (18) having electrically alterable optical characteristics is placed across the optical path of the instrument (12). An electrical control (36 and 38) is connected to the shutter for selectively providing a variable voltage to the shutter to electrically alter optical characteristics of the shutter in a controlled manner so that the optical characteristics of the shutter correspond to selected optical characteristics.

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