MAGNETIC NOISE REDUCING DEVICE USING SQUID

摘要

A magnetic noise reducing device can effectively produce a practically noiseless space that can reduce environmental magnetic noise harmful for measuring biomagnetism with a high magnetism damping factor in low frequency range. The magnetic noise reducing device comprises a SQUID flux meter and a pair of noise canceling coils as minimum components, the feedback current I produced by the SQUID flux meter being supplied to the noise canceling coils, the magnetic flux detecting coil of the SQUID flux meter being arranged within a specific central space defined by the noise canceling coils for effective reduction of magnetic noise within that space.