Patent ID: 11860095
Assignee: RADIOMETER MEDICAL APS
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A method of detecting a contaminant in a measurement chamber of a sample analyzer, wherein the sample analyzer comprises an optical sensor with a sensor layer comprising a luminophor, wherein the sensor layer has a sensor surface forming an interface to a fluid sample present in the measurement chamber, the method comprising:
filling the measurement chamber with the fluid sample;
applying a stimulus to the luminophor in the sensor layer;
detecting luminescence emitted from the luminophor in the sensor layer in response to the stimulus as a function of time;
obtaining a time sequence of measurement values for the detected luminescence;
based on the time sequence, determining an actual value of a first parameter and an actual value of a second parameter, wherein one of the first and second parameters is sensitive to a change in refractive index across the interface between the sensor layer and the measurement chamber, and wherein the other one of the first and second parameters is not sensitive to said change in refractive index across the interface between the sensor layer and the measurement chamber; and
providing feedback on a contamination state based on the actual value of the first parameter and the actual value of the second parameter.