摘要 |
<p>The purpose of the present invention is to provide a magnetic sensor device capable of preventing false detection caused by a magnetic field generated by a magnetic sensor affecting a conducting body that is outside the sensor. Specifically, a magnetic excitation coil (20) and a detection coil (30) are disposed, in a magnetic sensor device (10), to be facing and to sandwich a specimen placement space (40). A magnetic sensor element (12), comprising the magnetic excitation coil (20) and the detection coil (30), is accommodated in a sensor case (11). The sensor case (11) comprises an outer case (17) made from a non-magnetic conducting metal. The outer case (17) covers the entire perimeter of the magnetic excitation coil (20) and the detection coil (30) excluding the side on the periphery of the magnetic excitation coil (20) facing the detection coil (30) and the side on the periphery of the detection coil (30) facing the magnetic excitation coil (20). Moreover, the inner face of the outer case (17) is provided with a magnetic shield portion (18) made of a magnetic metal.</p> |