Optics: measuring and testing – Refraction testing – Prism engaging specimen
Patent
1973-04-27
1977-10-11
Evans, F. L.
Optics: measuring and testing
Refraction testing
Prism engaging specimen
356210, G01J 350, G01N 2148
Patent
active
040532356
ABSTRACT:
A digital reflection densitometer system comprises a power supply unit and a digital reflection densitometer instrument which is connected to the power supply unit by means of an electrical cable. The instrument is manually positionable over a surface and includes a housing which is supported on a foot. The foot is adapted for engagement with the surface and includes target apparatus for designating a predetermined area of the surface. The housing is normally pivotally separated from the foot by a spring and is manually pivotable to an operating position adjacent the foot.
A plurality of lamps are mounted in the housing for illuminating the predetermined area of the surface when the housing is in the operating position. Light reflected from the predetermined area is directed through an optical system to a light sensitive apparatus comprising a planar silicon sensor. The output of the planar silicon sensor is directed through an operational amplifier and a logarithmic amplifier to a digital volt meter which actuates a digital display device mounted in the housing of the instrument to provide a visual digital readout indicative of the output of the planar silicon sensor. The instrument further includes apparatus for selectively positioning any one of a plurality of filters in the path of light passing through the optical system to the planar silicon sensor, and for simultaneously adjusting the gain of the operational amplifier and the sensitivity of the digital volt meter to compensate for differences between the filters.
REFERENCES:
patent: 2311101 (1943-02-01), Tuttle et al.
patent: 3367230 (1968-02-01), Williams
patent: 3473878 (1969-10-01), Schweitzer
patent: 3504981 (1970-04-01), Malvin
patent: 3572944 (1971-03-01), Hanline et al.
patent: 3715163 (1973-02-01), Mitchell
patent: 3734630 (1973-05-01), McIntosh et al.
patent: 3771877 (1973-11-01), Rosencranz
Cox James R.
Hampton Perry Dwaine
Cosar Corporation
Evans F. L.
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