Active shielding for measurements of ultra- weak and low frequency magnetic signals Project by Grzegorz Wyszyński Supervisor: prof. dr hab. Kazimierz Bodek.

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Presentation transcript:

Active shielding for measurements of ultra- weak and low frequency magnetic signals Project by Grzegorz Wyszyński Supervisor: prof. dr hab. Kazimierz Bodek

Magnetic field noise

Magnetocardiography (MCG)

Magnetocardiography

Magnetoencephalography (MEG)

How to shield the magnetic noise? B=0 COMPUTERCOMPUTER CURRENT SOURCE

Current active compensation systems

1st idea – additional coils

My idea:

My solution:

How good are the compensation systems?

Comparison – more distant source

Improving spherical coil system

Improving spherical coils

Summary Active magnetic shielding is a crucial part in many new medical diagnostic tools. It is also crucial for many experiments Commonly used systems are based on Helmholtz like coils Coil system proposed by us is based on decomposition of magnetic field into orthogonal multipoles Such systems gives 100 times better results