Optics: measuring and testing – Photometers – Light absorbing
Patent
1975-02-04
1976-03-09
Smith, Alfred E.
Optics: measuring and testing
Photometers
Light absorbing
356244, 356103, G01J 140, G01N 2106
Patent
active
039428990
ABSTRACT:
A flat sandwich composite plate of nested wedge-shaped sheets of highly transparent and gray neutral density filter glasses is enclosed in a frame. A bracket on the frame mounts it on the carriage of an optical instrument which measures the light scattering characteristics of a series of samples traversed on a carriage past a photometering station. A surface of the composite plate has a mat finish which scatters the light passing through it. The density and thickness of the filter glass are arranged to cover a predetermined range of light scatter corresponding to that caused by the range of samples which the optical instrument can accurately measure. An appended flat section of filter glass provides light scatter characteristics corresponding to an auxiliary sample characteristic. The transmittance of the appended section is adjusted by a movable leaf and notched adjusting segments. The mat surface is obtained by frosting a surface of the filter glass by blasting or grinding with 9 micron grit. The neutral density filter glass has a flat spectrum characteristic obtained by doping with carbon.
REFERENCES:
patent: 1419725 (1922-06-01), Fisher
patent: 2244507 (1941-06-01), Thomas
patent: 2682801 (1954-06-01), Davidson et al.
patent: 3381572 (1968-07-01), Tvwiner
patent: 3418484 (1968-12-01), Harmon
patent: 3627424 (1971-12-01), Dorman et al.
patent: 3832532 (1974-08-01), Praglin et al.
Henry Jon W.
Pfizer Inc.
Smith Alfred E.
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