Optical analyzing instrument with equal wavelength increment ind

Details Optical analyzing instrument with equal wavelength increment ind Optical analyzing instrument with equal wavelength increment ind

1981-03-30

1984-04-17

Evans, F. L.

Optics: measuring and testing

By shade or color

With color transmitting filter

250231SE, 250339, 350315, G01J 350

Patent

active

044431082

ABSTRACT:
In an instrument adapted particularly for analyzing agricultural products, such as grain, interference filters are rotated successively through an infrared wide wavelength band beam of light, which irradiates a sample of the product. Each of the interference filters operates to transmit a narrow wavelength band of light, the center frequency of which is scanned through a range of values as the angle of incidence of the beam of light to the interference filter varies as the filter rotates through the beam of light. An optical track is provided which rotates with the assembly of interference filters to generate pulses from index markings in the optical track. The markings in the optical track are spaced so that one pulse is generated for each angstrom of variation of the center frequency transmitted through an interference filter. The pulses are counted in the counter and the counts in the counter are used to control the selection of intensities reflected from the sample to be used in the analysis of the sample.

REFERENCES:
patent: 3385160 (1968-05-01), Dawson et al.
patent: 4082464 (1978-04-01), Johnson, Jr.
Angus, UV Group Bulletin, No. 8, Part 1, Jun. 1980, pp. 53-60.
Angus, Optical Spectra, vol. 14, No. 8, Aug. 1980, pp. 49-52.

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