| 摘要 |
An impulse resonance spectrometer is provided, wherein high frequency energy in the shape of pulses is applied to a sample material located in a polarizing magnetic field, to detect a nuclear magnetic resonance signal from the sample material. The spectrometer includes a first oscillator which oscillates at a first high frequency for generating a first frequency signal corresponding to a main signal of the nuclear magnetic resonance signal. A nuclear magnetic resonance signal measuring device measures the difference between frequencies of the main signal and a subsidiary signal of the nuclear magnetic resonance signal detected from the sample material by applying the output of the first oscillator to the sample material. A second oscillator in the form of a phase-locked loop oscillates to produce an output corresponding to the frequency signal from the nuclear magnetic resonance signal measuring device, and a mixer modulates the first oscillator output with the output of the second oscillator and oscillates at a second high frequency for applying to the sample material a second frequency signal corresponding to the subsidiary signal.
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