Hardware development

Coils

Our portable magnetic resonance instruments can be used outside the laboratory as each application has its own probe (sensor or magnet field/RF transducer unit). Each probe must be developed for a particular use, and the signal-to-noise ratios optimised in unfavourable circumstances.

These challenging parameters have led to the investment of considerable effort to design tailored magnetic fields based on wire arrays and discrete cylindrical permanent magnets. All this research supports magritek.

Earth's field NMR (EFNMR)

Temperature-stabilised Halbach probe

This research underpins the Terranova spectrometer developed by magritek. In particular, we have developed new imaging capability on this instrument, as well as enhancing its use as an analytical tool for materials and food research.

A PhD project by Meghan Halse made considerable use of the magritek Terranova. New hardware for Dynamic Nuclear Polarisation techniques was developed to considerably increase the signal-to-noise ratio. The use of a copper shielding box also dramatically decreased the sensitivity to external noise. These improvements led to new spectroscopy experiments at Earth’s field.

Permanent Magnet NMR

We are developing permanent magnet arrays, which optimise the field profiles needed for one-sided NMR experiments. Because permanent magnets exhibit individual variability, actual field distributions must be measured.

A three axis field mapper using a three axis hall probe enable the complete characterisation of individual magnets as well as the measuring and verification of completed designs.

Hallbach-based permanent magnet arrays have also been used for Antarctic sea-ice study.

Hyperpolarised Gas NMR

Hyperpolarisation equipment

Following visits from Professor Thomas Meersmann and Dr Galina Pavlovskaya (see News page), a hyper-polarisation apparatus was commissioned in our lab. An optical pumping setup allows the hyper-polarisation of 129Xe gas. This will be used for further exploration of porous media and for signal enhancement at low fields.