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ISU researchers have developed a new non-resonant NMR pulse generating circuit that improves the response of the applied oscillating magnetic field, reducing ringdown time and improving probe signal-to-noise ratio.  The pulse generation circuit features high pulse rate for increased bandwidth and high amplitude for improved instrument signal level.

The circuit has been demonstrated to generate pulsed magnetic fields in the 1 to 5 MHz frequency range at current levels of 10 A.  The circuit improves detection of magnetic resonance in the presence of low level static magnetic fields, improving sensitivity of portable NMR instruments.

Benchtop and portable NMR spectroscopes have been commercially available in recent years.  These devices are useful for a multitude of applications, including chemical analysis, medical imaging, monitoring of chemical reactions, process control, food science, teaching, environmental sensing, energy exploration and explosives detection. Small high-power magnets generate a static magnetic field, combined with a portable sensor that generates a pulsed magnetic field and detector.  Physical limitations of small permanent magnets are accompanied with associated limits in the strength of static magnetic fields that can be generated.  Improvements in the circuit that generates the pulsed magnetic field offer greater instrument bandwidth and increased signal amplitude.  These provide improved instrument signal-to-noise ratio.  The improved pulse generation circuit enables improved instrument sensitivity and will also reduce the cost of portable NMR spectroscopes.

• Improved instrument sensitivity, expanding capability of portable NMR spectroscopes

• Lower instrument cost

• Can be integrated with existing benchtop instrument designs

Benchtop and portable NMR spectroscopy