Spectrophotometer arrangement with multi-detector readhead

Details Spectrophotometer arrangement with multi-detector readhead Spectrophotometer arrangement with multi-detector readhead

1994-06-30

1995-12-19

Evans, F. L.

Optics: measuring and testing

By shade or color

Trichromatic examination

356407, 356409, 250226, G01N 2125

Patent

active

054773261

ABSTRACT:
A photometer readhead is used to measure concentrations within a test sample of preselected color-developed analytes having different characteristic absorption bands. The photometer readhead comprises an artificial light source for illuminating the test sample, a plurality of light-emitting diodes for detecting light transmitted through or reflected from the test sample, and a housing assembly for enclosing and supporting the plurality of light-emitting diodes. The plurality of light-emitting diodes have spectral responses encompassing respective ones of the different characteristic absorption bands of the preselected color-developed analytes. The plurality of light-emitting diodes preferably include a first light-emitting diode having a spectral response in red portion of the visible light spectrum; a second light-emitting diode having a spectral response in the blue portion of the visible light spectrum, a third light-emitting diode having a spectral response in the green portion of the visible light spectrum, and a fourth light-emitting diode having a spectral response in the infrared light spectrum.

REFERENCES:
patent: 4834541 (1989-05-01), Yamaba
Mims III, Forest M., "Sun Photometer With Light-Emitting Diodes As Spectrally Selective Detectors", Applied Optics, vol. 31, No. 33, Nov. 20, 1992.

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