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Nuclear Magnetic Resonance

Nuclear Magnetic Resonance (NMR) is the most precise technology in magnetic field measurement.

There are two fundamental methods of detecting the Nuclear Magnetic Resonance. The continuous-wave approach is like tuning a radio: we slowly adjust the frequency until we “tune in” the resonance. To be able to detect it, we must cross and re-cross the resonance, which means we must modulate either the frequency or the magnetic field.

The pulsed-wave approach, on the other hand, is like ringing a bell: we strike the sample with a broad-band pulse, and the sample absorbs and reradiates at the Larmor frequency. The pulsed mode approach requires modern, fast-switching electronics, but it is more straightforward and generally delivers greater precision.

Built on pulsed-wave NMR detection and advanced signal processing, our new generation of magnetometers are faster, more precise and more robust than legacy continuous-wave NMR detectors.

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With its many advantages including improved precision, high fields, inhomogeneous fields, rapid measurement and shorter search time, the PT2026 NMR magnetometer opens a host of new application areas.


Introduced 25 years ago, Metrolab’s NMR magnetic field cameras revolutionized field mapping for MRI magnets. Our cameras reduced acquisition times from hours to minutes, positioning errors to a fraction of a millimetre, and rendered negligible human and drift errors.

Market leader

With more than 1700 Metrolab Precision Teslameters shipped, NMR magnetometry has become an everyday tool for physicists, engineers and technicians throughout the world. The most common applications include research, magnet manufacturing and testing, and standards and calibration. Some accelerator and spectroscopy manufacturers build the Metrolab’s Precision Teslameters right into their products.

About Metrolab

Established in 1985, Metrolab Technology SA is a Swiss company based in Geneva. We are the global market leader for the development and manufacture of precision magnetometers, which are used to measure high-intensity magnetic fields to a very high degree of precision.

 Shimming to ensure spatial field uniformity
“A primary consideration in building an NMR magnet is to achieve the spatial field uniformity required for high resolution spectroscopy. An as-built magnet, whether HTS or LTS, will rarely achieve the desired level of bare-magnet uniformity and so the magnetic field around the sample zone is mapped and corrected (“shimmed”), in the case of an HTS magnet by careful placement of  ferromagnetic elements in the bore of the magnet. The process is iterated until the desired field profile is achieved, typically yielding a field error of no more than a few parts per million, ppm.
This level of resolution in a high background field places significant demands on the mapping tool and since the most precise technology to measure magnetic fields is NMR itself, we employ Metrolab’s MFC2046 NMR magnetic field camera for the task. A small probe array, MFC9146, consisting of an array of NMR sensors is used to map the surface of the target cylindrical volume, allowing rapid and accurate measurement of the local field and providing a dependable basis for the critical shimming operation.”
Donald Pooke, CTO at HTS-110, Lower Hutt, New-Zealand.