Reflectance measuring apparatus for making contactless measureme

Details Reflectance measuring apparatus for making contactless measureme Reflectance measuring apparatus for making contactless measureme

1986-07-23

1988-07-12

McGraw, Vincent P.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrophotometer

356328, 356446, 356429, G01J 336, G01J 342, G01N 2186, G01N 2147

Patent

active

047566191

ABSTRACT:
A reflectance measuring apparatus for contactless measurement is described, in which the result of measurement is not dependent on the distance from the test object within a predetermined range. This is attained by disposing the light source in the focus of a condenser, and by providing that the measuring area is smaller than the core region inside the irradiated area on the surface of the test object.

REFERENCES:
patent: 3718399 (1973-02-01), Kalman
patent: 3743430 (1973-07-01), Riggs
patent: 3973849 (1976-08-01), Jackson et al.
patent: 4003660 (1977-01-01), Christie Jr. et al.
patent: 4076421 (1978-02-01), Kishner
patent: 4093385 (1978-06-01), Noboru
patent: 4319847 (1982-03-01), Howarth
patent: 4449821 (1984-05-01), Lee
patent: 4568191 (1986-02-01), Barry

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