Improved determination of FID signal parameters in low-field NMR

摘要: In this work, novel methods are suggested for assessing signal parameters of the free induction decay (FID) in nuclear magnetic resonance (NMR) experiments. The FID was recorded a microtesla field and analysed to determine its relaxation time, amplitude, Larmor frequency phase. challenge posed by narrow line width, whose related effects were investigated through simulations, also. developed give new view on estimation as well lower higher fields. It is shown that transverse time sample can be accurately determined domain other means than Lorentz peak half width. Also, with some realistic approximations, simple functional form power spectrum shape proposed. As inspection instead absorption dispersion Lorentzians advantageous sense waveform independent automatic efficient presented work incorporate an integral exponential fit, fit two ways When there sufficiently many data points peak, provides quick, accurate way determining FID. measurements however, width led establishing more applicable method which based temporally moving window.