Liquid crystal device for calibration and testing of optical ins

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

1989-11-29

1991-07-09

McGraw, Vincent P.

Optics: measuring and testing

Standard

2502521, 350330, G01J 102, G01D 1800, G02F 113

Patent

active

050300059

ABSTRACT:
A device and method for optical calibration of an optical instrument that measures optical characteristics along an optical path. A controllable shutter having electrically alterable optical characteristics is placed across the optical path of the instrument. An electrical control 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.

REFERENCES:
patent: 4435047 (1985-03-01), Fergason
patent: 4595292 (1986-06-01), Amodeo et al.

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