Optics: measuring and testing – Photometers – Modulating
Patent
1998-03-11
1999-08-10
Font, Frank G.
Optics: measuring and testing
Photometers
Modulating
356213, 356214, G01J 134, G01J 136, G01J 100, G01J 160
Patent
active
059367245
ABSTRACT:
A flicker photometer has beam generating means (1, 8 and 4) for generating two beams of light of different colors. Light from the beams is viewed at the viewing means, and the intensity of light of one beam relative to that of the other beam can be adjusted by adjustment means comprising an attenuating filter (20) which is movably mounted in the path of one beam. Movement of the filter relative to the beam alters the degree to which the beam is attenuated, and is achieved using an electric motor (22). The motor provides a relatively easy means of adjusting the filter position, and can be used to provide coarse and fine adjustments in response to suitable signals from an optical encoder. The motor also enables the filter, along with the beam generating means, to be mounted on a movable table for use in enabling the photometer to accommodate both short and long-sighted subjects.
REFERENCES:
patent: 2471249 (1949-05-01), Stearns
patent: 3787124 (1974-01-01), Lowy et al.
patent: 3811781 (1974-05-01), Lowy
patent: 3819256 (1974-06-01), Bellows et al.
patent: 4515165 (1985-05-01), Carroll
Bone Richard Andrew
Huang Wenlue
Landrum John Thomas
Orta Carlos Manuel
Font Frank G.
Punnoose Roy M.
The Howard Foundation
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