发明名称 |
Q-factor switching method and apparatus for detecting nuclear quadrupole and nuclear magnetic resonance signals |
摘要 |
A probe ( 80 ) for irradiating a sample with RF energy during transmitting periods and detecting an NQR or NMR signal from a substance contained within the sample during receiving periods. The probe ( 80 ) comprises a variable impedance unit ( 20 ) for changing the Q-factor of the probe and a probe coil. The probe ( 80 ) is responsive to powerful RF pulses applied thereto to excite an RF magnetic field in the probe coil during the transmitting periods. The variable impedance unit ( 20 ) is controllable to provide a Q-factor for the probe ( 80 ) at: (i) an optimal level during a prescribed transmitting period of an RF pulse for irradiating the sample with said RF energy; (ii) a minimal level during a prescribed recovery period immediately following said transmitting period to rapidly dampen transient signals from the probe; and (iii) a maximal level during a prescribed receiving period for detecting an NQR or NMR signal from the target substance if present, immediately following the recovery period. A method for detecting an NQR or NMR signal within a sample using the probe ( 80 ) is also described.
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申请公布号 |
US2007040556(A1) |
申请公布日期 |
2007.02.22 |
申请号 |
US20060438439 |
申请日期 |
2006.05.23 |
申请人 |
QRSCIENCES PTY.LTD. |
发明人 |
RUDAKOV TARAS N.;MIKHALTSEVITCH VASSILI T.;CHISHOLM WARRICK P.;FLEXMAN JOHN H.;HAYES PETER A. |
分类号 |
G01V3/00;G01R33/36;G01R33/44;G01V3/14 |
主分类号 |
G01V3/00 |
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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