The function blocks of the low field NMR circuit system are analyzed at first. Then the signal amplitude is calculated. The antenna interface and the preamplifier are studied in detail at last.

本文首先对低场磁共振电路系统的各个功能模块进行了分析，并估算了低场磁共振的信号幅值，然后重点对天线接口和前置放大两个电路模块进行了分析研究。

youdao

The white Gaussian noise was successfully separated from noise signal in low-field pulse NMR system and its parameters were estimated by using this method.

采用该方法从实际低场脉冲核磁共振系统噪声信号中分离出高斯白噪声并对其进行了参数估计。

youdao