CORRECTION CIRCUIT FOR A STATIC MAGNETIC FIELD OF AN NMR APPARATUS AND NMR APPARATUS FOR UTILIZING THE SAME

摘要

In the NMR apparatus the resonant conditions may be kept constant by adjusting the strength of the static magnetic field. The echo signal that is induced under the specific conditions is processed so as to obtain the deviation of the resonant frequency in the correction circuit. The shift of the given static magnetic field is calculated based upon the deviation of the resonant frequency. The DC energizing current for the HO power supply is varied based upon the magnetic field shift so as to maintain the NMR phenomenon at the desirable resonant conditions.