Rectangular impinging beam

Details Rectangular impinging beam Rectangular impinging beam

1981-02-20

1988-04-12

McGraw, Vincent P.

Optics: measuring and testing

By shade or color

With color transmitting filter

356419, G01J 351

Patent

active

047370343

ABSTRACT:
An optical analysis system employs a rectangular beam of light passing through interference filters to analyze the constituents of a test sample moving through the beam. A plurality of interference filters are moved successively through the beam between the source of the beam and the sample and are tilted about an axis as they are moved, thereby transmitting a range of wavelengths to the sample. Skew rays of light in the beam strike the filters at different angles from the angles at which rays parallel to the axis of the beam strike the filters and so transmit wavelengths different from those of rays parallel to the axis of the beam. The angle deviation is greatest for the skew light rays which are skewed from the axis of the beam in a plane perpendicular to the tilt axis of the filters. Thus, the shorter dimension of the rectangular beam is arranged to be perpendicular to the tilt axis of the filters.

REFERENCES:
patent: 3885879 (1975-05-01), Louder et al.
patent: 4040747 (1977-08-01), Webster
patent: 4082464 (1978-04-01), Johnson
patent: 4084909 (1978-04-01), Mathisen
patent: 4154533 (1979-05-01), Levine
patent: 4400086 (1983-08-01), Webster

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