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The quadrupole mass analyzer consists of four cylindrical metal rods arranged in a diamond carrying a DC voltage and a radio-frequency AC voltage. The motion of ions through the quadrupole depends on the field strength, causing only ions of a certain m/z to resonate successfully and strike the detector at a given field strength. Though the transmission rate for these analyzers is high, the exact elemental composition of the sample is not determined because of low resolution; however, they are...
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A compact and mobile stray-field NMR sensor.

Belal M K Alnajjar1, Jürgen Frick2, Bernhard Blümich3

  • 1Institute of Smart Sensors, University of Stuttgart, Stuttgart, Germany.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|November 26, 2024
PubMed
Summary
This summary is machine-generated.

We developed a compact, single-sided stray field sensor for Nuclear Magnetic Resonance (NMR) relaxometry. This novel sensor achieves high spatial resolution (50µm) for analyzing diverse materials.

Keywords:
Compact NMR sensorCultural heritageDepth profilingNMR magnetPermanent magnetRelaxometry

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Area of Science:

  • Magnetic Resonance Imaging
  • Materials Science
  • Sensor Technology

Background:

  • Nuclear Magnetic Resonance (NMR) relaxometry is crucial for material characterization.
  • Existing NMR systems can be bulky and lack high spatial resolution for in-situ analysis.
  • A need exists for compact, high-resolution sensors for diverse material applications.

Purpose of the Study:

  • To introduce a compact, single-sided stray field sensor for NMR relaxometry.
  • To achieve high spatial resolution and sensitivity for analyzing various materials.
  • To demonstrate the sensor's versatility and performance in practical applications.

Main Methods:

  • Designed and optimized a compact magnet (0.424T) with enhanced homogeneity using a genetic algorithm.
  • Developed a custom radiofrequency (RF) coil for maximum sensitivity and lateral selectivity (<20µs dead time).
  • Utilized 3D-printed structures and CPMG measurements for precise alignment and achieving 50µm spatial resolution.

Main Results:

  • The sensor achieved a spatial resolution of 50µm, adaptable with acquisition time.
  • Demonstrated high sensitivity and lateral selectivity suitable for micro-scale analysis.
  • Successfully applied the sensor to analyze cosmetics, elastomers, glue, and wood.

Conclusions:

  • The developed compact, single-sided stray field sensor offers high spatial resolution for NMR relaxometry.
  • The optimized design, alignment strategy, and measurement scheme provide a versatile tool for material science.
  • This technology enables detailed analysis of material properties with unprecedented resolution.