Optics: measuring and testing – Of light reflection – By comparison
Patent
1980-02-19
1981-11-10
Evans, F. L.
Optics: measuring and testing
Of light reflection
By comparison
356243, G01N 2157
Patent
active
042994977
ABSTRACT:
A portable instrument quantitatively determining the distinctness of image of a sample paint film by providing comparison of the film with several standard films of known distinctness of image is provided. The instrument displays the sample and one of the standards within an enclosed casing while an image forming pattern is projected simultaneously on both by a light source within the instrument. By changing the standard which is displayed, an observer compares the distinctness of image of the sample with the known values of several standards until a match is found.
REFERENCES:
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patent: 2799203 (1957-07-01), Kerr
patent: 2830490 (1958-04-01), Pellegrini
patent: 3396627 (1968-08-01), Rouy et al.
Hunter, Research Paper RP 958, Part of Journal of Research of the National Bureau of Standards, vol 18, Jan. 1937, pp. 19-39.
Harrison, Proceedings, Porcelain Enamel Institute Form, PPEFA, vol. 23, 1961, pp. 154-163.
General Motors Engineering Standards, Materials and Processes, GM 9101-P, pp. W-65.201 and W-65.202, Jan. 1977.
E. I. Du Pont de Nemours and Company
Evans F. L.
Levin Gary H.
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