PULSE MODULATED FOURIER TRANSFORM MAGNETIC RESONANCE SPECTROMETER UTILIZING QUADRATURE PHASE DETECTION AND HIGH PASS FILTER TO ELIMINATE UNDESIRED STRONG RESONANCE LINES

摘要

A magnetic resonance spectrometer, for example a pulse modulated Fourier transform spectrometer system, wherein the carrier frequency is positioned on an undesired output resonance line, the receiver circuitry of the system including a quadrature phase detection stage in which the resonance lines falling on the positive and negative frequency side of the zero frequency position in the output spectrum corresponding to the carrier frequency component may be distinguished, the receiver circuitry including a high pass filter positioned between the quadrature phase detector stage and the analog to digital converter for removing all frequency components near the zero component from the signal transmitted to the analog to digital converter, whereby the strong undesired resonance line is eliminated from the output spectrum.