| 摘要 |
A magnetic sensor device (20) for determining the presence and/or amount of target moieties in a sample fluid is provided. The magnetic sensor device comprises:—a sensor chamber (12) having a sensor surface (120), the sensor surface comprising a plurality of binding sites (121) adapted for binding magnetic or magnetizable objects; and—a magnetic field generating means (26) adapted for generating a magnetic field for inducing a movement of magnetic or magnetizable objects along the sensor surface (120), the magnetic fields having a magnetic field gradient across the sensor surface (120). The magnetic field gradient generated by the magnetic field generating means (26) in each of the centres of the plurality of binding sites (121) is substantially identical.
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