一、引言迄今为止所叙述的核磁共振磁强计系统中公认的自动磁场跟踪法(例如 Jung 等人1972,Verkhovskii 等人1975,Kurashor 等人1975)都是由在自动频率控制回路中包含核磁共振振荡器所组成的。谐振位置的误差信号由弱磁场 I. INTRODUCTION The accepted methods of automatic magnetic field tracking in NMR magnetometer systems so far described (eg, Jung et al., 1972, Verkhovskii et al., 1975, Kurashor et al., 1975) are all based on the inclusion of magnetic resonance in an automatic frequency control loop Oscillator consisting of. The error signal at the resonant position consists of a weak magnetic field