SQUID MAGNETOMETER
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...
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Main Author | |
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Format | Patent |
Language | English |
Published |
19.06.1991
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Subjects | |
Online Access | Get full text |
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Summary: | 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. |
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Bibliography: | Application Number: JP19890284331 |