| 摘要 |
<p>Disclosed is a magnetometer (100) for measuring an external magnetic field. The magnetometer is comprised of at least one core (102), at least one excitation coil (106a, 106b) and at least one pick-up coil (104). The core (102) has a magnetoresistance property measurable in response to the external magnetic field. The at least one excitation coil (106a, 106b) is near or around the core (102) or at least one of the cores (102). The excitation coil (106a, 106b) is configured to be driven by an alternating current to partially saturate a magnetisation of the core (102) during part of the AC cycle. The at least one pick-up coil (104) is near or around at least a portion of the core (102) and the excitation coil (106a, 106b). The pick-up coil (104) is configured to carry a signal induced in the presence of the external magnetic field. The induced signal is measurable in response to the external magnetic field.</p> |
