Open-type magnetic field shielding device capable of adjusting at full frequency band
A shielding device and full frequency band technology, applied in the direction of magnetic/electric field shielding, active shielding, electrical components, etc., can solve the problems that the magnetic field regulator cannot be adjusted, unfavorable engineering practice, large volume ratio, etc., and achieve the effect that is beneficial to engineering practice
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Embodiment 1
[0019] Such as figure 1 As shown, this embodiment discloses a magnetic field shielding device, including: a magnetic field detection coil 1, a magnetic field detection coil 2, a magnetic field detection probe 3, a drive circuit 4, a magnetic field adjustment coil 5, and a sample stage 6 in addition to Shield the magnetic field7.
[0020] The magnetic field detection coil 1 is responsible for monitoring the change of the environmental magnetic field. The magnetic field detection coil 1 receives the signal detected by the magnetic field detection probe 3. The magnetic field detection coil will generate a voltage signal of U=dΦ / dt. The voltage signal of the detection coil is amplified by the drive circuit and then driven The magnetic field adjusting coil 5 cancels the external magnetic field 7 . In Embodiment 1, in order to obtain a shimming area as large as possible, the magnetic field adjustment coil 5 adopting a Helmholtz structure coil is a separate coil group structure, whi...
Embodiment 2
[0026] In embodiment 1, a single-directional magnetic field shielding structure is provided, and in embodiment 2, an open full-band magnetic field shielding device capable of shielding three-directional magnetic fields is provided. It uses three sets of orthogonal Helmholtz coils to form a magnetic field adjustment coil group, such as image 3 shown. Corresponding magnetic field detection coils, the magnetic field detection coils also need to be matched, which will not be repeated here.
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