NMR Signals Alignment Method for Spectrum Accumulation in Portable Device

Nuclear magnetic resonance spectroscopy is a technique for the identification and the quantification of chemical molecules in a sample that has been perfectly established for decades. The transition from laboratory NMR to portable NMR for in-field measurements present a quite high number of technological challenges. One of them is the synchronization between signals emitted and received by the device during NMR measurement. With the use of on-the-shelf hardware, such as software defined radio which drastically reduces development costs, distortion might be introduced due to latencies between several Free Induction Decay (FID) recordings, preventing direct FID accumulation for NMR spectrums improvement. The aim of this paper is to study a software method that compensates the latencies, thus enabling NMR signal accumulation. This technique has been tested in simulation and has proved effective even when signal-to-noise ratios are below 0 dB.