Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1991-08-06
1993-08-31
Hannaher, Constantine
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
250341, 2503601, G01N 2135, G01N 2147
Patent
active
052411788
ABSTRACT:
Apparatus for quantitative analysis of a material sample, such as whole grain, as a function of optical characteristics thereof includes a light source and a solid state detector of silicon or other suitable construction. A material sample is positioned between the light source and the detector, and light energy is focused through the sample onto the detector at a plurality of preselected wavelengths in the near-infrared range of 800-1100 nm. Illumination wavelength is selectively controlled by an opaque disc having a central axis and a plurality of apertures around the periphery at uniform radius from the disc axis. A plurality of filter elements are carried by the disc over respective ones of the peripheral apertures and have transmission characteristics corresponding to the plurality of preselected wavelengths. The filter elements are carried in a continuous circumferential array around the disc periphery, with the array including at least one opaque section for chopping light energy incident on the detector. The disc is rotated about its axis in a continuous motion so that each filter element in turn intersects light energy transmitted through the sample. Analysis electronics is responsive to light energy incident on the detector at the plurality of preselected wavelengths to indicate a preselected characteristic of the material sample.
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Roche et al., "Tilt Tunable Ultra Narrow-Band Filters For High Resolution Infrared Photometry" Applied Optics vol. 14, No. 3, Mar., 1975 pp. 765-770.
Beyer Jim
Hannaher Constantine
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