NUCLEAR MAGNETIC RESONATOR

PURPOSE:To achieve the shortening of measuring time by preventing the generation of a ghost peak by a new type quadrature detection to obtain a correct magnetic resonance spectrum of a nucleus observed. CONSTITUTION:Nuclear magnetic resonance signals are detected by single analog receiving systems 2, 5, 8 and 9 and measuring data is subjected to an A/D conversion to be sent to a processor 12. The frequency of a transmission signal for resonance excitation is set in a nuclear magnetic resonance spectrum distribution area while the frequency of a reference signal for detecting the resonance signals to be off the spectrum distribution area. In the rear stage of the analog receiving systems, one or both of a frequency difference and a phase difference of the transmission signal for resonance excitation and the reference signal for detection are corrected digitally based on a sine value and a cosine value determined with a phase generator 11 to perform a digital computation of a complex number with the nuclear magnetic resonance signals given a phase difference of 90 deg..