Patent ID: 8797028

Claim:
A sensor device for determining an amount of target particles at a contact surface of a sample chamber in which a sample with said target particles can be provided, comprising: a sensor element for detecting the target particles in the sample chamber and for providing at least one sensor signal; and an evaluation unit for directly or indirectly determining the amount of target particles in a first zone immediately at the contact surface and in a second zone a distance away from the contact surface based on the at least one sensor signal, wherein the contact surface comprises binding sites for specifically binding the target particles, wherein the sensor element provides at least two sensor signals that are in a different way sensitive for the amount of target particles in the first zone and the second zone, respectively, and wherein a first sensor signal of the at least two sensor signals is measured with a sensitivity which is higher in the first zone than in the second zone, and a second sensor signal of the at least two sensor signals is measured with a sensitivity which is lower in the first zone than in the second zone.