To perform an easy and stable superconductive connection, improve he reliability and reduce the manufacturing cost by forming a coil by use of a NbTi wire, and connecting it to a SQUID (superconducting quantum interference device) by a superconductive connecting material showing superconductive characteristic at least at liquid helium temperature.
A single-channel dc-SQUID fluxmeter has a detecting part 11 and a drive circuit 12. The detecting part 11 is dipped in a flask containing liquid helium, and placed in superconductive state. The detecting part has a SQUID 21 as superconductive ring, and a detecting coil 22 for detecting a feeble magnetic field generated by a living body. SQUID 21 has a magnetic flux input coil 21a and a feedback coil 21b integrally formed thereon, and a wiring for forming the detecting coil 22 is superconductively connected to the magnetic flux input coil 21a. The detecting coil 22 can be wound by various types of method, and as the wiring material of the detecting coil 21, a NbTi wire is used.
TAKADA YOICHI
OYU SHIGEHARU
TAKAHASHI KATSUO
