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Frequency Mixing Magnetic Detection Scanner for Imaging Magnetic Particles in Planar Samples
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A CMOS Hall sensor modeling with readout circuitry and microcontroller processing for magnetic detection.

Hua Fan1, Jiayi Zhang1, Siming Zuo2

  • 1School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 610054, China.

The Review of Scientific Instruments
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Summary
This summary is machine-generated.

This study presents a portable Hall sensor system for detecting magnetic nanoparticles. The microsystem offers improved efficiency and cost-effectiveness for rapid heavy metal analysis in air and blood.

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Area of Science:

  • Electrical Engineering
  • Materials Science
  • Biomedical Engineering

Background:

  • Magnetic field detection is crucial for analyzing magnetic nanoparticles.
  • Existing systems often lack portability and cost-efficiency for rapid analysis.
  • Hall sensor arrays offer a potential solution for sensitive magnetic field detection.

Purpose of the Study:

  • To develop a portable Hall sensor array system for magnetic field detection and analysis.
  • To enable rapid measurement of heavy metal particles (Fe, Co, Ni) in ambient air and blood.
  • To improve upon the portability, cost, and efficiency of existing magnetic particle detection systems.

Main Methods:

  • Fabrication of a Hall sensor array system using X-FAB 0.18 μm CMOS technology.
  • Utilizing magnetization of metal coils and particles with Hall sensor array characteristics for detection.
  • Integration of Hall sensors, analog front-end, analog-to-digital converter (ADC), and microcontroller unit (MCU).
  • Simulation verification using Ansoft Maxwell and COMSOL Multiphysics software.

Main Results:

  • The system can detect magnetic particles with a minimum diameter of 2 μm.
  • The proposed ADC achieved a signal-to-noise-and-distortion ratio of 70.61 dB, spurious-free dynamic range of 90.08 dB, and effective number of bits of 11.44.
  • The STM32-based microsystem integrates hardware and software for real-time magnetic field and voltage display.
  • Significant improvements in portability, cost, and efficiency compared to prior systems.

Conclusions:

  • The developed Hall sensor array system provides a complete solution for magnetic field detection and analysis.
  • The microsystem demonstrates high performance in detecting magnetic nanoparticles.
  • The system is well-suited for rapid, portable, and cost-effective analysis of heavy metals in environmental and biological samples.