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US 2008/0259339 A1Published application
System and method for acquiring and evaluating optical signals
AssigneeRoche Diagnostics Operations, Inc.
InventorsFrederic Wehowski, Bern Rosicke, Stefan Kalveram
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Abstract
A system and method for measuring and evaluating optical signals for detecting an analyte in an analysis liquid.
Claims21
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.
4 more elements
A method for measuring and evaluating photometric signals for detecting an analyte in an analysis liquid, comprising the following steps:
- illuminating an optical evaluation zone of a test carrier by a powered light source,
- receiving the light remitted from the optical evaluation zone by a light sensor,
- converting the light received by the light sensor into a measuring signal,
- generating a first control signal having a first frequency and a first intensity,
- generating a second control signal having a second frequency and a second intensity,
- generating a light control signal from the first control signal and the second control signal for activating the light source,
- feeding the measuring signal received from the light sensor to a first frequency-selective amplifier and to a second frequency-selective amplifier,
- feeding the first control signal to the first frequency-selective amplifier and feeding the second control signal to the second frequency-selective amplifier,
- feeding a first output signal of the first frequency-selective amplifier and a second output signal of the second frequency-selective amplifier to an evaluation unit,
- comparing the first output signal to the second output signal in the evaluation unit, and
- determining information about the measuring signal from the result of the comparison.
8 more elements
Dependencies are inferred from the claim text.