Apparatus for measuring the photometric and colorimetrics charac

Details Apparatus for measuring the photometric and colorimetrics charac Apparatus for measuring the photometric and colorimetrics charac

1997-05-30

1999-03-09

Font, Frank G.

Optics: measuring and testing

By polarized light examination

With light attenuation

356372, 356371, 356 73, G01B 1124

Patent

active

058808450

ABSTRACT:
Apparatus comprising a measurement lens (2) forming the image of the Fourier transform (102) of the elementary area (101) in its image focal plane (Fi), a transfer lens (3) forming the image of the elementary area on a sensor (4) formed by detectors (4i,j), a diaphragm (5) for defining the aperture of the elementary area (101), and a processing circuit (6).
The lens (2) producing the Fourier transform is associated with a field lens (10), the combination of these two means (2, 10) and of the circular aperture of diameter (d) which is defined by the diaphragm (5) making it possible, for any light beam having an angle of incidence .theta. and an angle of azimuth .psi., to select a measurement area of elliptical shape on the object (1) analyzed.

REFERENCES:
patent: 3572885 (1971-03-01), Reinheimer et al.
patent: 4512640 (1985-04-01), Nihoshi
patent: 4870263 (1989-09-01), Deutsch
patent: 5106183 (1992-04-01), Yoder, Jr.
patent: 5182614 (1993-01-01), Lill
patent: 5477332 (1995-12-01), Stone et al.

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