Magnetic sensor having a superconducting quantum interference device and a pickup coil wound on a tubular resinous bobbin with embedded high thermal conductivity material

A magnetic sensor comprising:

• a SQUID which is in the superconducting state on a level of cryogenic temperature;
• a tubular resinous bobbin (34) having plural wires (35), each coated with a resinous film and made of non-magnetic material with high thermal conductivity and having plural wires (36), each made of non-conductive material such as glass fiber, both of the plural wires (35), (36) being embedded in the body of the resinous bobbin (34) and netted in a grid pattern in such a manner that the wires (35) made of non-magnetic material with high thermal conductivity extend substantially in an axial direction of the bobbin (34);
• and
• a magnetic-flux input circuit (32) which is connected to the SQUID and has a pick-up coil (33) wound around the tubular resinous bobbin (34).

A magnetic sensor comprising:

• a SQUID which is in the superconducting state on a level of cryogenic temperature;
• a tubular bobbin (34) having a resinous body (37) and plural wires (35), which are made of non-magnetic material with high thermal conductivity and which are embedded in the resinous body (37) with set spaces left respectively in a circumferential direction of the bobbin (34) so as to extend substantially in an axial direction of the bobbin (34);
• and
• a magnetic-flux input circuit (32) which is connected to the SQUID and has a pick-up coil (33) wound around the tubular resinous bobbin (34).

A magnetic sensor comprising:

• a SQUID which is in the superconducting state on a level of cryogenic temperature;
• a tubular bobbin (34) having a wall part (34a) made of three layers formed of a high thermally-conductive resin layer (38) which is so formed that resin is mixed with non-magnetic material with high thermal conductivity, and two fiber reinforced resin layers (39), (39) which are respectively embedded inside and outside the high thermally-conductive resin layer (38) and each includes non-conductive material such as glass fiber;
• and
• a magnetic-flux input circuit (32) which is connected to the SQUID and has a pick-up coil (33) which is connected to the SQUID and has a pick-up coil (33) wound around the tubular resinous bobbin (34).