Apparatus for determining the diffuse reflectivity of a...

Details Apparatus for determining the diffuse reflectivity of a... Apparatus for determining the diffuse reflectivity of a...

G - Physics

01

N

73/57, 73/0.5

G01N 21/17 (2006.01) G01N 21/47 (2006.01) G01J 1/16 (2006.01) G01J 1/36 (2006.01)

Patent

CA 1224640

Abstract of the Disclosure The present invention relates to an apparatus for determining the diffuse reflectivity of a sample surface of small dimensions, especially of the test field of a test strip for determining the substances contained in a body fluid. The apparatus has a semiconductor light emitter, especially a light-emitting diode, for the emission of visible or infrared light to the sample surface, a measuring receiver for receiving the light diffusely reflected by the sample surface and producing an electrical signal corresponding thereto, an evaluating means including an electronic circuit for converting the receiver signal to a value corresponding to the diffuse reflectivity, and a reference channel using the light from the same emitter for the calibration of the apparatus and for the elimination of errors of measurement caused by variations of the emitter or of other electronic components.

475302

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