There are very few sources of DC field, large magnets and the earths DC field are the two most common.
For some purposes such as Electron-Microscopy equipment the disturbance of the earth’s magnetic field via ferrous movement is to be avoided by proximity or shielding.
Magnetic resonance Imaging (MRI) can create up to 7Tesla and beyond at the MRI core, luckily the DC field decays rapidly from source.
The controlled area for an MRI is and field greater than 5 gauss, the 5g line from an MRI magnet can be some distance from the magnet and can imping on rooms/areas outside the MRI suit into uncontrolled/public areas, in this case DC shielding is required.
The process of magnetic energy flowing easier in the shield medium compared to free air is called ‘magnetic reluctance’.
Global EMC have:
Researched two methods of DC shielding each suited to special applications.
Experience in MRI shielding.
Experience in Electron-Microscopy for DC~3KHz field benign environments.
About Global EMC
Global EMC UK Ltd has 30 years experience in RFI / EMI / EMC and are specialists in shielding / RF / Microwave absorber applications. Continual development of shielded
rooms (Faraday cages) and anechoic chambers has bought us to the forefront of shielded chamber and anechoic test chamber technology. Read More >