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1. 发明授权

US5814992A NMR probe head with cryogenically cooled preampifiers 失效
标题翻译： NMR探针头与低温冷却前置放大器
公开(公告)号：US5814992A
公开(公告)日：1998-09-29
申请号：US754057
申请日：1996-12-03
申请人： Max Erick Busse-Grawitz , Walter Roeck
发明人： Max Erick Busse-Grawitz , Walter Roeck
IPC分类号： G01R33/32 , G01R33/34 , G01R33/36 , G01R33/3815 , G01N3/00
CPC分类号： G01R33/34 , G01R33/34023
摘要： A nuclear magnetic resonance (NMR) probe head for use in a room temperature bore of a superconducting NMR magnet cryostat for investigation of generally room temperature samples comprises a radio frequency (RF) receiving coil, a receiving coil preamplifier connected to the receiving coil, at least one additional coil and cryogenic means connected to the RF receiving coil, to the receiving coil preamplifier, and to the at least one additional coil for keeping the RF receiving coil, the preamplifier and the additional coil at a cryogenic temperature. The apparatus is improved in that at least one additional preamplifier is connected to the additional coil and to the cryogenic means the cryogenic means keeping the additional preamplifier at a cryogenic temperature. The apparatus exhibits improved performance and increased flexibility.
摘要翻译：用于一般室温样品研究的超导NMR磁体低温恒温器的室温孔中的核磁共振（NMR）探针头包括射频（RF）接收线圈，连接到接收线圈的接收线圈前置放大器，连接到RF接收线圈，接收线圈前置放大器和至少一个附加线圈的至少一个附加线圈和低温装置，用于将RF接收线圈，前置放大器和附加线圈保持在低温温度。该装置的改进在于至少一个附加前置放大器连接到附加线圈，而低温装置将保持附加前置放大器的低温装置连接在低温温度。该装置表现出改进的性能和增加的灵活性。

2. 发明授权

US5552710A Method and automatic auxiliary device for tuning of an NMR receiving coil 失效
标题翻译：用于调谐NMR接收线圈的方法和自动辅助装置
公开(公告)号：US5552710A
公开(公告)日：1996-09-03
申请号：US499856
申请日：1995-07-10
申请人： Max E. Busse-Grawitz , Enrico Malacarne , Walter Roeck
发明人： Max E. Busse-Grawitz , Enrico Malacarne , Walter Roeck
IPC分类号： G01R33/36 , G01V3/00 , G01V3/14
CPC分类号： G01R33/3628
摘要： A method for tuning of the probe head impedance (Z.sub.x) of an NMR receiver coil having a receiver circuit for an NMR signal with which, by means of an RF tuning signal (3), the probe head impedance (Z.sub.x) is tuned via a first reference signal produced with real reference resistance (R.sub.0) at one location M2 within the receiver circuit is characterized in that a reference impedance (Z.sub.0) is matched at an arbitrary location in the path of the RF tuning signal (3) in the receiver circuit (10; 11) in such a fashion that a second reference signal corresponding to the first reference signal at location M2 occurs at location M2 and that subsequently, the probe head impedance (Z.sub.x) is tuned to the second reference signal at location M2. In this fashion, in the path of the NMR signal at the input to the preamplifier, the number of necessary diodes, RF chokes and other components, which can lead to signal losses, is minimized. Furthermore, in the path of the NMR signal at the input to the preamplifier during normal operating conditions, all diodes which are located here are in a non-conducting state and there are no diodes in series with the path of the NMR signal.
摘要翻译：一种用于调谐具有用于NMR信号的接收器电路的NMR接收器线圈的探针头阻抗（Zx）的方法，借助于RF调谐信号（3），探针头阻抗（Zx）经由在接收机电路内的一个位置M2处用实参考电阻（R0）产生的第一参考信号的特征在于，在接收机电路中的RF调谐信号（3）的路径中的任意位置匹配参考阻抗（Z0）（10; 11），使得在位置M2处对应于第一参考信号的第二参考信号发生在位置M2处，并且随后在位置M2将探头头部阻抗（Zx）调谐到第二参考信号。以这种方式，在前置放大器的输入处的NMR信号的路径中，可以导致信号损耗的必需二极管，RF扼流圈和其它分量的数量被最小化。此外，在正常工作条件下在前置放大器的输入端的NMR信号的路径中，位于此处的所有二极管处于非导通状态，并且没有与NMR信号的路径串联的二极管。

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