MoreSpin

Aim of the project MoreSpin (Mobile Magnetic Resonance Sensor with supraconducting coil for prepolarization in the near surface soil) is to develop a mobile NMR instrument for detecting and mapping near-surface (2m) soil physical parameters. Supraconducting prepolarization coils and adiabadic excitation pulses will significantly improve signal quality.

Project objectives

Moisture stored in near surface soils is key for a manifold of ecological processes. The soil, being the interface between the atmosphere and the lithosphere, plays a crucial role for the transport of water and the dissolved substances therein. At present, there are no suitable direct methods to determine soil moisture content at the required spatial and temporal length and time scales. Not only are direct methods on the km scale disproportionately involved, furthermore, the only available geophysical methods on this length scale are indirect methods and therefore highly ambiguous. One nondestructive geophysical surface method that is well established is surface nuclear magnetic resonance or magnetic resonance sounding (MRS). However, standard MRS is not suitable to map (km scale) the near surface soil physical properties due to its lack of sensitivity in the first 2 m and the usually high expenditure of time needed for conducting measurements.
At this point, the developments of the MoreSpin project come into play. By using a superconducting coil for prepolarization (Px) together with adiabatic excitation pulses the near surface sensitivity is greatly increased. Furthermore, we aim to develop measurement strategies based on compact B-field receivers that a allow a detailed spatial resolution of the soil parameters in question.

MoreSpin Phase I is already completed. Results can be found here.

MoreSpin Phase II is on-going. Current results can be found here.

Publications

  • Feasibility study on prepolarized surface nuclear magnetic resonance for soil moisture measurements. - Vadose Zone Journal , 000(0): 000-015.
    2021, HILLER, T., COSTABEL, S., RADIC, T., DLUGOSCH, R. & MÜLLER-PETKE, M.
  • Utilizing pre-polarization to enhance SNMR signals - effect of imperfect switch-off. - Geophysical Journal International, 222 (2): 815-826.
    2020, HILLER, T., DLUGOSCH, R. & MÜLLER-PETKE, M.
  • First Measurements of Surface Nuclear Magnetic Resonance Signals Without an Oscillating Excitation Pulse-Exploiting Non-Adiabatic Prepolarization Switch Off. - Geophysical Research Letters, 48 (23), e2021GL095371.
    2021, HILLER T, COSTABEL S, DLUGOSCH R, MÜLLER-PETKE M
  • Enabling surface nuclear magnetic resonance at high noise environments using a pre-polarization pulse. - Geophysical Journal International, 212 (2), 1463–1467.
    2018, LIN, T., YANG, Y.,TENG,F., MÜLLER-PETKE, M.
  • Non-remote reference noise cancellation-using reference data in the presence of surface-NMR signals. - Journal of Applied Geophysics, 177, 104040.
    2020, MÜLLER-PETKE, M.

Team

Project management

Prof. Dr. Mike Müller-Petke
 

Project scientist

Phase I Dr. Thomas Hiller
Phase II Dr. Tobias Splith

Funding

Phase I

Grant no. MU 3318/4-1

Duration

01.01.2018-31.12.2020

Phase I

Grant no. MU 3318/8-1

Duration

01.01.2022-31.12.2024