发明名称 |
Circuit for detecting AC magnetic field due to magnetic resonance with a variable resistance for noise suppression |
摘要 |
In a signal detecting circuit of, for example, an NMR apparatus, a signal transmission path transmits an AC magnetic flux signal to be superposed on a DC magnetic field whose strength does not change with time during a period of signal detection. The signal transmission path comprises a superconducting closed loop including a receiving coil receiving the AC magnetic flux signal, an input coil applying the received AC magnetic flux signal as an input to a flux meter, and a variable resistor replacing part of the superconducting closed loop and having its resistance value changed in relation to a change in the strength of the DC magnetic field.
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申请公布号 |
US4875010(A) |
申请公布日期 |
1989.10.17 |
申请号 |
US19880174424 |
申请日期 |
1988.03.28 |
申请人 |
HITACHI, LTD. |
发明人 |
YOKOSAWA, KOICHI;YAMAMOTO, ETSUJI;NAKANE, HIDEAKI;YABUSAKI, MASAO;OGURA, YUKIKO |
分类号 |
A61B5/055;A61B10/00;G01R33/035;G01R33/32;G01R33/36 |
主分类号 |
A61B5/055 |
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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