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NMR hand-held moisture sensor.

P J Prado1

  • 1Quantum Magnetics, Inc., 7740 Kenamar Court, San Diego, California 92121, USA. Pablo.prado@qm.com

Magnetic Resonance Imaging
|July 11, 2001
PubMed
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A new hand-held Nuclear Magnetic Resonance (NMR) sensor enables in-situ material testing. This portable NMR tool shows promise for assessing wood moisture and cement hydration in real-world conditions.

Area of Science:

  • Materials Science
  • Analytical Chemistry
  • Physics

Background:

  • In-situ material assessment is crucial for quality control and structural integrity.
  • Nuclear Magnetic Resonance (NMR) offers non-destructive analysis capabilities.
  • Portable NMR sensors can expand the applicability of NMR techniques to field environments.

Purpose of the Study:

  • To present an open magnet design for a hand-held NMR sensor head.
  • To demonstrate the utility of this portable NMR sensor for in-situ material assessment.
  • To validate the sensor's performance in characterizing wood moisture content and cement hydration.

Main Methods:

  • Developed an open magnet design for a hand-held NMR sensor.
  • Utilized millimeter-scale 3D magnetic field modeling to optimize magnet positioning.

Related Experiment Videos

  • Employed a low Q-factor circuit for spin-echo sequences with short echo times.
  • Conducted tests on wood moisture content and cement hydration.

    • Main Results:

    • The hand-held NMR sensor head was successfully designed and constructed.
    • The magnetic field distribution was effectively adjusted using modeled magnet positioning.
    • The sensor demonstrated potential for in-situ wood moisture content analysis.
    • The sensor showed promise for monitoring cement hydration processes.

    Conclusions:

    • The presented hand-held NMR sensor is a viable tool for in-situ material assessment.
    • The open magnet design and optimized field distribution are key to its functionality.
    • This portable NMR technology can be applied to diverse material testing scenarios.