Difference between revisions of "Fourier Transform"
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Revision as of 09:38, 15 April 2021
Fourier Transform does mathematically what our ears do physically: resolve a signal into component frequencies. FT is a method to determine the simple wave components of a mixed wave. The method is theoretically based on calculus, but is actually carried out computationally using numerical analysis.
The signal output from an NMR instrument is called a Free Induction Decay (FID) and looks like the image on the left, which is intensity of the signal versus time. A fourier transform algorithm is applied to the signal which converts it to intensity versus frequency and looks like the image on the right:
A simple file output of the FID from the instrument is a 2d matrix of data with 2 columns and as many rows as requested for the resolution in the experimental parameters.
