| 摘要 |
<p>In an NMR spectrometer, the amplitude of specific components are found substantially independent of magnetic field inhomogeneity. After excitation by pulsed transmitter (21), frequency difference extractor (13) receives the signal and produces a signal (14) representing the difference between a desired spectroscopic component and a reference component such as that of the water line. Signal (14) and known difference frequencies stored at (17) are mixed by multiplier (15). The desired spectroscopic component may be obtained by filtering signal (22).</p> |
