Multi-detector readhead for a photometer

Details Multi-detector readhead for a photometer Multi-detector readhead for a photometer

G - Physics

01

N

G01N 21/31 (2006.01) G01J 1/42 (2006.01) G01N 21/25 (2006.01)

Patent

CA 2146845

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 transmitted diodes have spectral responses encompassing respective ones of the different characteristic absorption bands of the preselected color-developed analytes. Theplurality of light-emitting diodes preferably include a first light-emitting diode having a spectral response in the 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.

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