Magnetic shield with holes
Magnetic shield with holes
(OP)
Hi,
I have to shield a scientific instrument from an external magnetic field of 500G with a Supra50 tube of about 45mm OD and which is effectively closed at either end. I also have to put some 6mm radial holes in the shield tube to pump out the air. I can calculate the required tube wall thickness OK but I don't know what effect the 6mm holes will have on the shielding of the instrument and I can't find a reference on the web. Can anybody point me in the direction of a good source on shield design (with holes) or enlighten me regarding the significance of the 6mm holes.
Thanks in advance.
I have to shield a scientific instrument from an external magnetic field of 500G with a Supra50 tube of about 45mm OD and which is effectively closed at either end. I also have to put some 6mm radial holes in the shield tube to pump out the air. I can calculate the required tube wall thickness OK but I don't know what effect the 6mm holes will have on the shielding of the instrument and I can't find a reference on the web. Can anybody point me in the direction of a good source on shield design (with holes) or enlighten me regarding the significance of the 6mm holes.
Thanks in advance.





RE: Magnetic shield with holes
RE: Magnetic shield with holes
RE: Magnetic shield with holes
Solution is to have more small holes if you can rather than larger ones, and provide a flux shunt(s) to minimise the flux density near the holes.