Abstract
A proton-resonance magnetic field stabilizer using a frequency stabilizer was designed and constructed. The frequency of an RF oscillator is stabilized by means of a new frequency stabilizer which consists of a frequency counter, a thumb rotary switch, a BCD subtractor, a DA converter and a varicap located in the tank circuit of the oscillator. The frequency stability of <1 × 10−6/h was obtained in this system. The magnetic field stabilizer consists of mainly the RF oscillator, a preamplifier, a selective band amplifier, a phase sensitive detector, a DC voltage amplifier, a DC power amplifier, a stabilization coil and an LF oscillator. This system was simplified by the use of many integrated circuits and IC power packs. The stability of this magnetic field stabilizer was measured to be <2 × 10−6/h.
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