System for analyzing sample liquids containing a position...

Optics: measuring and testing – Of light reflection – With diffusion

Reexamination Certificate

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C422S082050

Reexamination Certificate

active

06906802

ABSTRACT:
System for analyzing sample liquids by evaluating test elements with an analytical unit (20) in which a test element (10) to be analyzed is positioned by a holder (21, 22, 120, 140) in an analytical position relative to the analytical unit and the system additionally comprises a position control unit to check whether an analytical area of the test element is correctly positioned relative to the analytical unit wherein the position control unit comprises a light source (30, 2) to irradiate an area of the test element and preferably the analytical area (11), a detector (31, 131) to detect light reflected from the area and an evaluation unit, and the light source and detector are positioned relative to one another in such a manner that the light intensity of specularly reflected radiation at the detector when the test element is correctly positioned is different from a light intensity when it is incorrectly positioned and the evaluation unit recognizes any faulty positioning on the basis of the light intensity at the detector.In addition the invention concerns a method for sample analysis using a position control unit to check whether a test element is correctly positioned relative to an evaluation optics.

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Beckmann, Petr et al, “The Scattering of Electromagnetic Waves from Rough Surfaces”, Pergamon Press, Oxford London, New York, Paris, 1963 . (3 pgs).
European Search Report for European Application No. 01128869.3-1524-, Apr. 5, 2003, 4 pages.

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