VACOSHIELD - Mastering Magnetic Shielding
MSRs are used for shielding applications that are very sensitive to magnetic sources of interference. Our VACOSHIELD® rooms are a proven solution that has become an industry standard.
What distinguishes VACOSHIELD?
- Modular MSR system with short lead times
- Fast setup within two weeks
- Low weight MSR for flexible installation
- Experienced assembly teams for world-wide installations
- Degaussing-prepared MSR
- Reliable and user-friendly pneumatic doors provide comfortable access
- Warranty on MSR products and shielding factors
- On-site modifications and MSR relocation
- Very high typical shielding factors at very low frequencies, determined under practical acceptance conditions
- Outstanding shielding also of time-varying magnetic fields by means of a high-performance conductive shell
- Bespoke MSRs
Shielding weakly variable magnetic fields is difficult. The most effective way is to divert the magnetic flux around a cabin. This only works with so-called soft magnetic materials, such as the newly developed VACOPERM HP, which has outstanding magnetic conductivity (permeability).
The diagram on the right illustrates that the higher the permeability and the thicker the wall thickness of a shield, the better the shielding performance. The larger the shielding enclosure, the lower the shielding factor.
Each soft magnetic material has a saturation-dependent course of the permeability μr. The permeability of 80 % NiFe material in shielded rooms depends on its magnetic flux saturation. The initial permeability, already high at low magnetic fields, increases with modulation up to a maximum, then decreases significantly as the material saturates.
These properties directly affect the shielding factor, which also depends on the modulation. Therefore, the shielding factor must be defined with precise measurement conditions to ensure the MSR performance in real applications.
The shielding factor of a MSR depends significantly on the amplitude of the magnetic interference fields. Common customer applications require a high attenuation with small interference field.
VAC’s test procedure is specifying a magnetic flux density of 1 μTRMS as the reference value in the center of the MSR. This test provides customers with the necessary information about how well even weak interference fields can be shielded. At higher flux densities the typical shielding values are larger by factors, see figure.
The graphic shows an example of the typical specified shielding factor of a VACOSHIELD MSR (3 x 4 m) compared to typical values as determined by ASTM 698.
Shielding weakly variable magnetic fields is difficult. The most effective way is to divert the magnetic flux around a cabin. This only works with so-called soft magnetic materials, such as the newly developed VACOPERM HP, which has outstanding magnetic conductivity (permeability).
The diagram on the right illustrates that the higher the permeability and the thicker the wall thickness of a shield, the better the shielding performance. The larger the shielding enclosure, the lower the shielding factor.
Each soft magnetic material has a saturation-dependent course of the permeability μr. The permeability of 80 % NiFe material in shielded rooms depends on its magnetic flux saturation. The initial permeability, already high at low magnetic fields, increases with modulation up to a maximum, then decreases significantly as the material saturates.
These properties directly affect the shielding factor, which also depends on the modulation. Therefore, the shielding factor must be defined with precise measurement conditions to ensure the MSR performance in real applications.
The shielding factor of a MSR depends significantly on the amplitude of the magnetic interference fields. Common customer applications require a high attenuation with small interference field.
VAC’s test procedure is specifying a magnetic flux density of 1 μTRMS as the reference value in the center of the MSR. This test provides customers with the necessary information about how well even weak interference fields can be shielded. At higher flux densities the typical shielding values are larger by factors, see figure.
The graphic shows an example of the typical specified shielding factor of a VACOSHIELD MSR (3 x 4 m) compared to typical values as determined by ASTM 698.
Our Services
- Necessary MSR size and shielding performance
- On-site requirements and conditions
- Tender and legal requirement
- Project timeline
- Site survey service
- Dimensioning and simulation of MSR with analytical calculation models and FEM simulation (Ansys Maxwell 3D) with reliable prediction of shielding performance
- Active Compensation consulting
- Degaussing using pre-installed coils
- Preselection of top-quality strip material batches and adapted annealing process
- Short lead times for VACOSHIELD
- Fast setup within two weeks for standard MSR
- Experienced assembly teams for worldwide installation
- Direct support from a well-established and reliable supplier
- On-site modificaions and MSR moves possible
- Necessary MSR size and shielding performance
- On-site requirements and conditions
- Tender and legal requirement
- Project timeline
- Site survey service
- Dimensioning and simulation of MSR with analytical calculation models and FEM simulation (Ansys Maxwell 3D) with reliable prediction of shielding performance
- Active Compensation consulting
- Degaussing using pre-installed coils
- Preselection of top-quality strip material batches and adapted annealing process
- Short lead times for VACOSHIELD
- Fast setup within two weeks for standard MSR
- Experienced assembly teams for worldwide installation
- Direct support from a well-established and reliable supplier
- On-site modificaions and MSR moves possible
Downloads
Contact Us Think Global - Act Local
We are looking forward to support you.
