Magnetic shielding apparatus and magnetic shielding method
A technology of magnetic shielding and shielding cover, applied in shielding devices, magnetic/electric field shielding, measuring devices, etc., can solve the problems of not considering the magnetization component of the magnetic shielding cover and the magnetic field gradient created by the magnetic shielding cover
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[0055] figure 1 It is an overview perspective view of the magnetic shielding device 100 according to this embodiment. The magnetic shielding device 100 is used to shield the magnetic measurement device to block external magnetic fields such as geomagnetism when measuring a weak current from a living body as a magnetic force, for example.
[0056] The magnetic shielding device 100 has: a passive shield 11, external coils 12A, 12B that correct the internal magnetic field of the passive shield 11, a first magnetic sensor 14A, a second magnetic sensor 14B, and a passive shield 11 Internal coils 13A, 13B, and control unit 20 (refer to figure 2 ). Here, the external coils 12A and 12B are an example of the "first coil" according to the invention, and the internal coils 13A and 13B are an example of the "second coil" according to the invention.
[0057] The passive shield cover 11 has a cylindrical shape in which the inside is a cavity, and the axial direction thereof is arranged on a pe...
Deformed example 1
[0143] Configuration example of magnetic sensor
[0144] The configuration of the first magnetic sensor 14A etc. for measuring the magnetic field strength is not limited to figure 2 The configuration shown. Several configurations of the first magnetic sensor 14A and the like will be described below.
[0145] Image 6 It is an overview diagram showing the magnetic shielding device 200 of the second arrangement example. In this example, only one external coil 12A is driven and the other external coil 12B is not driven. Therefore, the control of the inflow magnetic field gradient executed by the control circuit 17 can be simplified.
[0146] Figure 7 It is an overview diagram showing the magnetic shielding device 300 of the third arrangement example. In this example, two sets of magnetic sensors are provided: a magnetic sensor that measures the inflow magnetic field flowing into the passive shield 11 and a magnetic sensor that measures the magnetic field of the internal space 110. ...
Deformed example 2
[0153] The cross-sectional shape of the passive shield cover 11 in the X direction is not limited to the shape described in the foregoing embodiment. For example, it may be a polygonal shape or a circular shape, or a shape obtained by combining a straight line and a curved line on the outer periphery. Specifically, the cross-sectional shape of the passive shield cover 11 can be a quadrilateral, a pentagon, a hexagon, a heptagon, an octagon, or the like if it is a polygon in addition to a circle or an ellipse.
[0154] In addition, the passive shield cover 11 does not need to have the openings 11A, 11B, or may be provided with only one of the openings 11A, 11B. Alternatively, the openings 11A and 11B may be covered with a cover or the like. The shape of the passive shielding cover 11 has a degree of freedom, so that the magnetic shielding device 100 can be applied to various magnetic measuring devices.
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