Towards a Model-Based Field-Frequency Lock for NMR

G. Galuppini, C. Toffanin, D. M. Raimondo, A. Provera, Y. Xia, R. Rolfi, G. Ferrante, L. Magni

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)
2 Downloads (Pure)


Nuclear Magnetic Resonance (NMR) relaxometry is a powerful technique that allows to investigate the properties of materials. More advanced NMR relaxometry techniques such as Fast Field-Cycling (FFC) require the magnetic field to reach any desired value in a very short time (few milliseconds) and field oscillations to stay within few ppms. Such specifications call for the introduction of a suitable Field Frequency Lock (FFL) system. FFL relies on an indirect measure of the magnetic field which can be obtained by performing a parallel NMR experiment with a known sample. In this paper we propose a PID controller to guarantee field fluctuations to stay below the desired level and short settling time. The tuning of the controller is based on a mathematical description of the entire process, which is validated by performing real experiments. Numerical simulations show promising results that we expect to be confirmed by real experiments.

Original languageEnglish
Pages (from-to)13020-13025
Number of pages6
Issue number1
Early online date18 Oct 2017
Publication statusPublished - 2017


  • Bloch Equations
  • Field-Frequency Lock
  • LS
  • NMR
  • PID


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