Friday, November 30, 2007
Throwing Away Noise to Improve Your Data
It is no surprise that the Fourier transform of noise is noise, so getting rid of noise in you FID will get rid of it from your spectrum as well. If your FID decays long before the acquisition time is over then you have collected unnecessary noise and your spectrum will have a lower than necessary signal-to-noise ratio. You can throw away the noise and replace it with null points before carrying out the Fourier transform. This is shown in the figure below where the improvement in the signal-to-noise ratio is obvious.A better idea is to save spectrometer time, make the acquisition time shorter and avoid collecting the noise in the first place.