| 摘要 |
PROBLEM TO BE SOLVED: To realize a magnetic shielding device which is excellent in responsibility and magnetic noise shielding efficiency. SOLUTION: A magnetic sensor (reference SQUID) 4 is installed at a position adjacent to a measuring magnetic sensor 3 inside a magnetic shielding room 1, an arithmetic unit 8 which calculates an output negatively fed back to a coil 5 on the basis of the output of the magnetic sensor 4 is provided, the coil 5 installed inside the magnetic shielding room 1 is so structured as to generate a magnetic field of certain magnitude corresponding to the output of the arithmetic unit 8, whereby a magnetic field which compensates environmental magnetic noises is restrained from being affected by material of high-permeability which forms the magnetic shielding room 1. |
