| 摘要 |
PURPOSE:To obtain a nuclear magnetic rsonator with a mgnetic field stabilization circuit which permits the closing of a feedback loop in the magnetic stabilization circuit (magnetic field lock) with a simple operation. CONSTITUTION:A D/A converter 16 generates a reference voltage for the center value and the sweep range of the magnetic field for the sweeping thereof and after it is amplified with a sweep amplifier 14, a specific current flows through a sweep coil 3 to effect the shift and the sweep of the magnetic field. Generally, a resonance signal which is detected with a detector 12 lags in the time after the setting of the reference voltage with the D/A converter 16 and when read with a data processor 19 in the sweeping of the magnetic field, it is deviated from a true resonator A even by sweeping in either positive or negative direction as illustrated. Therefore, a resonance magnetic field is detected by positive sweeping of the magnetic field and then, again by the negative sweep thereof. Then, the average value of the two magnetic values are calculated to determine the true resonance magnetic field so that a DC magnetic field will be set with the D/A converter 16 to form a feedback loop with the closing of a relay 5. |
