| 摘要 |
PURPOSE:To provide a functional superconducting magnetic shield requiring no detecting coil, improving the magnetic flux transmission rate, and increasing the signal magnetic flux inputted to a SQUID in a SQUID fluxmeter operated in a general magnetic shield room having the magnetic shielding rate of about 1/1000. CONSTITUTION:Two superconducting envelope bodies, e.g. circular rings, 11, 12 surrounded with the preset space on the plane or the curved surface by superconductors and surrounding two spaces having the same area respectively are connected by a superconducting connecting wire 13 so that the coil winding direction is made the same direction to form one superconducting closed loop as a whole. The so-called coupling type SQUID fluxmeter directly detecting the magnetic field with a SQUID ring is arranged in close contact with one of the superconducting envelope bodies, e.g. 12. The signal magnetic flux inputted to the direct coupling type SQUID fluxmeter is increased to about 50 times that of the conventional one. |
