Patent · US Expired

Apparatus for determining the diffuse reflectivity of a sample surface of small dimensions

US4676653A · kind A · utility

95Cited by

8References

15Claims

0Family size

Assignee

Boehringer Mannheim GmbH · DE

Inventors

Werner Strohmeier · Weilheim, DE
Dieter Knoll · Frankfurt (Oder), DE
Erich Handler · Starnberg, DE

Key dates

Filing date	Aug 27, 1984
Grant date	Jun 30, 1987
Priority date	—
Expiry date	Aug 27, 2004

Classification

Technology area (CPC G)Physics
CPC primaryG01N2201/062
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.