| 摘要 |
The invention relates to a magnetic sensor device comprising excitation wires (11, 13) for generating a magnetic field (B) in a sample chamber (1) and a magnetic sensor element (12), for example a GMR element, for sensing magnetic fields generated by magnetic particles (2) in the sample chamber. The device further comprises a reference field generator consisting of a linear conductor (14) and a planar conductor (15) between which the magnetic sensor element (12) is disposed. The magnetic reference field (B<SUB>ref</SUB>) generated by said conductors (14, 15) does not penetrate into the sample chamber (1) but reaches only the magnetic sensor element (12). Components of the sensor signal which are due to the magnetic reference field (B<SUB>ref</SUB>) can therefore be separated and used to calculate the sensor gain. This value can for example be used for an auto-calibration of the device during a measurement. |
