Method and apparatus for determining the concentration of a...

Details Method and apparatus for determining the concentration of a... Method and apparatus for determining the concentration of a...

2009-06-19

2011-10-25

Stafira, Michael P (Department: 2886)

Optics: measuring and testing

Of light reflection

C356S448000

Reexamination Certificate

active

08045172

ABSTRACT:
In a method for determining the concentration of at least one substance in a liquid the liquid is applied onto a test strip containing at least one test zone, wherein an optical sensor arrangement is moved step-by-step in a first direction over the surface of the test strip while the test trip is at the same time irradiated with light of a predetermined wave length and wherein in each step the radiation reflected from the surface of the test strip is measured, and wherein in each measurement step the test strip surface is irradiated alternately with light of at least two different wave lengths and the irradiation is measured at the same time and the difference between the measurement signals obtained in each measurement step using irradiation light of different wave lengths is analyzed.

REFERENCES:
patent: 5449898 (1995-09-01), Dosmann
patent: 7499154 (2009-03-01), Stock et al.

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