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Measurements of Soil Water Potential and Conductivity based on a Simple Evaporation Experiment using a Hydraulic Property Analyzer

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Relaxation in water from different sources in Rome: Field testing a portable, center-field relaxometer.

M Augustine¹, K O Strætkvern², M Nguyen¹

¹Department of Chemistry, University of California, Davis, CA 95616, USA.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)

|July 13, 2026

Summary

Miniature nuclear magnetic resonance (NMR) relaxometers show promise but require controlled environments. Field testing revealed that the reproducibility of these portable devices is highly temperature-dependent, necessitating stable conditions for accurate measurements.

Keywords:

Low field Portable NMR Relaxometry Water relaxation

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Area of Science:

Nuclear Magnetic Resonance (NMR) Spectroscopy
Materials Science
Geophysics

Background:

The development of miniaturized nuclear magnetic resonance (NMR) instruments, including tabletop and mobile relaxometers, has advanced significantly since the 1970s.
Portable center-field NMR relaxometers are currently under development for various applications, including well logging and nondestructive materials testing.
Field testing of a commercial miniature center-field relaxometer was conducted to evaluate its performance and reproducibility.

Purpose of the Study:

To field-test a commercial miniature center-field NMR relaxometer.
To assess the reproducibility of transverse ¹H water relaxation measurements obtained with the device.
To compare measurements taken under local field conditions with those under controlled laboratory settings.

Main Methods:

Transverse ¹H NMR relaxation decays were measured from various sources using a miniature center-field relaxometer at a 20 MHz Larmor frequency.
Measurements were performed locally in Rome, Italy, immediately after sampling.
Subsequent measurements were conducted under controlled laboratory conditions in Davis, California, USA, to assess reproducibility.

Main Results:

The miniature NMR relaxometer demonstrated functionality in field testing.
Reproducibility of the measurements was found to be highly dependent on temperature.
Accurate and reproducible results require well-controlled environmental conditions.

Conclusions:

The tested miniature NMR relaxometer is functional but exhibits significant temperature-dependent variability.
Environmental factors, particularly temperature, must be carefully controlled for reliable performance.
Further development is needed to enhance the reproducibility of portable NMR relaxometers for widespread field applications.