公开(公告)号：US3858112A

公开(公告)日：1974-12-31

申请号：US39916973

申请日：1973-09-20

申请人： NIPPON ELECTRIC VARIAN LTD

发明人： SATOH Y ,  FUNAKI H

IPC分类号： G01R33/36 ,  G01N27/78

CPC分类号： G01R33/3621

摘要： A receiver circuit for a nuclear magnetic resonance analyser includes a resonance circuit and an amplifier circuit. The resonance circuit includes a receiving coil for detecting nuclear magnetic resonance signals of two different frequencies and a crystal resonator connected in series with the receiving coil. The crystal resonator being chosen so that it is substantially inductive at the lower of the two frequencies and is substantially capacitive at the higher of the two frequencies. The output impedance of the resonance circuit is matched to the input impedance of an amplifier circuit to which it is attached at the two different frequencies. By use of this circuit signals of the two different frequencies may be amplified by a single amplifier.

摘要翻译： 用于核磁共振分析仪的接收器电路包括谐振电路和放大器电路。 谐振电路包括用于检测两个不同频率的核磁共振信号的接收线圈和与接收线圈串联连接的晶体谐振器。 选择晶体谐振器使得其在两个频率的较低处基本上是电感的，并且在两个频率的较高处基本上是电容性的。 谐振电路的输出阻抗与其在两个不同频率处连接的放大器电路的输入阻抗匹配。 通过使用该电路，两个不同频率的信号可以由单个放大器放大。