Method and apparatus for the compensation of undesirable sidebands in nuclear magnetic resonance spectra

摘要

The frequency of rotation ( omega m) and the phase of the movement of rotation of the specimen (10) are detected with the aid of a light sensor (12) and supplied to a compensation generator (18). This generator generates modulation signals (44 and 43) in each case for modulating the amplitude and phase of the nuclear signal detected from the specimen by means of an amplitude modulator (13) and a phase modulator (14), the frequency of modulation being equal to an integral multiple including the simple frequency of rotation ( omega m) of the specimen. The additional frequency components produced by the modulation of the nuclear signal are superimposed on the sidebands caused by the rotation of the specimen (10) in the static magnetic field (B0), as a result of which the sidebands are eliminated. IMAGE