NUCLEUS MAGNETIC RESONANCE SYSTEM

摘要

In a circuit generating a frequency signal for modulation used for getting the resonance signal of a basic material in a nucleus magnetic resonance system adopting a lock system which stabilizes the strength of a direct-current magnetic field the frequency signal for modulation is obtained by dividing a high frequency signal of a basic frequency source (1) by means of a variable frequency divider (15) rather than, as known, by a voltage control oscillator in which the signal is characterized by its instability. This frequency signal for modulation is led to a modulator (14) and modulates the high frequency signal from the basic signal source (1). The modulated high frequency signal being led to a prove (4), the resonance signal of the basic signal material is formed. The divider (15) is equipped with a changing switch (16) for changing the frequency dividing ratio so that the frequency signal for modulation is adjusted in accordance with various basic materials.