G - Physics – 01 – N
Patent
G - Physics
01
N
324/1
G01N 22/00 (2006.01) G01R 33/46 (2006.01) G01R 33/36 (2006.01)
Patent
CA 1042074
APPLICATION FOR PATENT of RICHARD R. ERNST for FOURIER TRANSFORM NMR SPECTROSCOPY EMPLOYING A PHASE MODULATED RF CARRIER ABSTRACT OF THE DISCLOSURE A nuclear magnetic resonance Fourier transform spectrometer includes a pulse modulated rf transmitter for delivering a train of radio frequency pulses having a pulse width pulse repetition rate to generate Fourier side bands to cover the spectral lines of the sample to be analyzed for exciting resonance of different resonance lines, if any, within the sample. Resonance of the sample is scanned in between successive transmitted pulses to obtain a multiplicity of successive time displaced components which are sampled and stored in a multiplicity of memory channels of a computer for time averaging thereof. The time averaged signal components are periodically read out and Fourier trans- formed to obtain a time averaged spectrum of the sample under analysis. Anomalous phase and intensity effects in the detected spectral lines are avoided by periodically shifting the phase of the pulse modulated carrier signal from one phase to another of at least three different relative phases in accordance with a predetermined sequence.
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