发明名称 |
Squid magnetometer including a flux-gate chopper using a mechanically vibrating superconducting mirror |
摘要 |
An apparatus for measuring magnetic fields that change at extremely low frequency contains a SQUID magnetometer having a super-conducting flux transformer for inductively coupling the measuring signal into a direct current SQUID sensor. Quasi-static magnetic fields that have frequencies far below 1 Hz are detected. The flux transformer has two inductively coupled windings. At least one winding is arranged on a first carrier element (chip) that enclose a common coupling hole. A second carrier element (counter chip) is attached to the first carrier element. A super-conducting oscillating diaphragm is positioned opposite the coupling hole. The mutual inductance of the windings is modulated with this super-conducting vibrating diaphragm through appropriate changes of the effective size of the coupling hole with a frequency that lies in a characteristic frequency range for low-level noise operation of the SQUID.
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申请公布号 |
US4804915(A) |
申请公布日期 |
1989.02.14 |
申请号 |
US19880151432 |
申请日期 |
1988.02.02 |
申请人 |
SIEMENS AKTIENGESELLSCHAFT |
发明人 |
HOENIG, ECKHARDT |
分类号 |
G01R33/035 |
主分类号 |
G01R33/035 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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