SQUID MAGNETOMETER

• Main Author: TAKAHATA MITSUHIRO
• Format: Patent
• Language: English
• Published: 19.06.1991
• Subjects: MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; TESTING

PURPOSE:To simplify work by connecting a compensating coil to a pickup coil and fusing a superconducting wire of the compensating coil with the use of a heat source provided with a switch installed externally. CONSTITUTION:For instance, if the sensitivity of a magnetometer is needed to lower down to one-tenth, a switch of a heat source corresponding to a first compensating coil (20muH) 3a is turned on. When the switch is turned on, the heat source heats to fuse a superconducting wire corresponding to a second compensating coil. Thereby flowing current corresponding to input magnetic flux phiin is allowed to flow in an input coil 2 through the second coil 3a as a current path. In this case, since the input current sensitivity as a squid element is constant, the magnetic flux detecting sensitivity decreases with the decrease of input current. In other words, the sensitivity decreases down to the degree of one-tenth compared with the normal detecting sensitivity. If the detecting sensitivity is needed to lower down to one hundredth, a switch of a heat source corresponding to the compensating coil 3b is turned on. As a result, the magnetic flux sensitivity can be changed by very simple work.