Optical analysis system having rotating filters

Details Optical analysis system having rotating filters Optical analysis system having rotating filters

1976-10-07

1978-04-04

Evans, F. L.

Optics: measuring and testing

Refraction testing

Prism engaging specimen

356189, 356201, 356209, 350315, 350318, G01J 350

Patent

active

040824640

ABSTRACT:
In an optical analysis system, six interference filters are mounted on a wheel on a cylindrical locus. The wheel rotates to move the filters in sequence through a beam of light and to vary the angle of incidence of the light to the filters as the filters move through the beam of light so that the wavelength passed by the filters is swept through a range of values. The intensity of light reflected from or transmitted through a test sample is detected to provide an indication of the reflective or transmissive optical density of the test sample at specific wavelengths. The angular position of each of the filters on the wheel is adjustable to make the range of light wavelengths transmitted by each filter adjustable.

REFERENCES:
patent: 2406318 (1946-10-01), Brace
patent: 2483875 (1949-10-01), Boyer
patent: 3457002 (1969-07-01), Magrath
patent: 3492478 (1970-01-01), Smith
patent: 3776642 (1973-12-01), Anson et al.
patent: 3819276 (1974-01-01), Kiess et al.
patent: 3861788 (1975-01-01), Webster

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