Stabilizer for stabilizing NMR magnetic field and method of the same

摘要

An NMR apparatus provided with a lock device having improved monotonicity without reducing a control range. The lock detector (20) performs complex detection of a detection signal and outputs to the lock corrector (22) an absorption signal SA which is a real number component of the detection signal and a dispersion signal SD which is an imaginary number component of the detection signal; the lock corrector (22) obtains a value SC by multiplying together SD/(SD 2 + SA 2 ) and a value G, and the lock power supply (24) performs adjustment so that a current flowing through the lock coil (26) is proportional to SC. Different constants G are selectively used according to the value of SD/(SD 2 + SA 2 ).