Patent ID: 7630084
Filing Date: 2009-12-08
Classification: A61B,G01N

Abstract:
1. An optical measuring device for detecting an analyte in an analysis liquid disposed on a test carrier which has an optical evaluation zone, the device comprising: a first signal generator for generating a first control signal having a first frequency and a first intensity, a second signal generator for generating a second control signal having a second frequency and a second intensity, a light source for illuminating the optical evaluation zone using a light control signal based on the first and second control signals; a light sensor for receiving light from the optical evaluation zone and for converting the received light into a measuring signal; a first frequency-selective amplifier, to which the measuring signal and the first control signal are fed and having an output for outputting a first output signal, a second frequency-selective amplifier, to which the measuring signal and the second control signal are fed and having an output for outputting a second output signal, an evaluation unit, to which the first output signal and the second output signal are fed, the evaluation unit being configured to compare the first output signal and the second output signal and to derive information about interference of the measuring signal based on the comparison.