| 摘要 |
PURPOSE:To enable an easy measurement of the absolute value of a magnetic flux with a high sensitivity without rotating a magnetic flux measuring sensor by winding a superconductive wire with a superconduction transition temperature on a rod body comprising metal with a low superconduction transition temperature. CONSTITUTION:A rod body 10 of a magnetic flux measuring sensor comprises a metal body with the superconduction transition temperature of T1 while a metal wire 20 is T2 in the superconduction transition temperature. This metal wire 20 insulatedly covered is wound in a proper number of turns. The sensor and squid element 40 are both housed into a Dewar bottle 60 which is filled with a liquid helium 70 to maintain the sensor and the element 40 at a very low temperature. Then, the absolute temperature of the sensor is kept below the transition temperature of the rod body 10 to make the magnetic flux zero inside the rod body 10 and then, shifted to the temperature intermediately between the transition temperatures of the rod body 10 and the metal wire 20 to measure the magnetic flux. In this manner, the absolute value of the magnetic flux can be measured easily with a high sensitivity without rotating the magnetic flux measuring sensor. |
