I have a related question to my first one below to refine my first question.
Does anyone here know of an existing (probably medical) product that uses
unusual shielding techniques to avoid immunity problems when exposed to high
amplitude DC and AC magnetic fields such as in MRI tests. By unusual, I mean
things like non-metallic shields or exotic materials we do not normally use.
In many medical tests, most shielding materials are not usable because of eddy
current heating or disruption of the field used in the test. I am looking for
material in existing products that does not heat up in strong fields and does
not disrupt the field itself much outside of the shield. A reference to a
supplier of such materials would good. I am not even sure if this is possible,
especially the lack of disruption of the field outside of the shielded
circuit/apparatus (any academics out there want to weigh in on this?).
An academic question might be: Can one shield a circuit or apparatus to a very
strong magnetic field (DC and/or time varying) without significantly affecting
the field outside of the shielded part? Doesn't seem possible to me.
Doug
Doug Smith wrote:
I have a question (as opposed to the usual article post). Can anyone
point me
to some resources online concerning shielding methods applied to medical
implants that shield both high amplitude DC as well as AC magnetic fields such
as found in MRI machines. I have been searching around Google finding only
standard EMI shield solutions. References to currently existing produces would
be great.
Doug
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