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Related Concept Videos

The Hall Effect01:30

The Hall Effect

Edwin H. Hall, in the year 1879, devised an experiment that could be used to identify the polarity of the predominant charge carriers in a conducting material. From a historical perspective, this experiment was the first to demonstrate that the charge carriers in most metals are negative.
Magnetic Fields01:27

Magnetic Fields

A moving charge or a current creates a magnetic field in the surrounding space, in addition to its electric field. The magnetic field exerts a force on any other moving charge or current that is present in the field. Like an electric field, the magnetic field is also a vector field. At any position, the direction of the magnetic field is defined as the direction in which the north pole of a compass needle points.
A magnetic field is defined by the force that a charged particle experiences...
Ferromagnetism01:31

Ferromagnetism

Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
Magnetic Susceptibility and Permeability01:31

Magnetic Susceptibility and Permeability

In linear magnetic materials, like paramagnets and diamagnets, magnetization is proportional to the magnetic field intensity. The constant of proportionality, a dimensionless number, is called magnetic susceptibility. The value of the susceptibility depends on the type of material.
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Motional Emf01:22

Motional Emf

Magnetic flux depends on three factors: the strength of the magnetic field, the area through which the field lines pass, and the field's orientation with respect to the surface area. If any of these quantities vary, a corresponding variation in magnetic flux occurs. If the area through which the magnetic field lines are passing changes, then the magnetic flux also changes. This change in the area can be of two types: the flux through the rectangular loop increases as it moves into the magnetic...
Magnetic Resonance Imaging01:24

Magnetic Resonance Imaging

Magnetic resonance imaging (MRI) is a noninvasive medical imaging technique based on a phenomenon of nuclear physics discovered in the 1930s, in which matter exposed to magnetic fields and radio waves was found to emit radio signals. In 1970, a physician and researcher named Raymond Damadian noticed that malignant (cancerous) tissue gave off different signals than normal body tissue. He applied for a patent for the first MRI scanning device in clinical use by the early 1980s. The early MRI...

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Magnetic Levitation Coupled with Portable Imaging and Analysis for Disease Diagnostics
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A mobile ferromagnetic shape detection sensor using a Hall sensor array and magnetic imaging.

Norhisam Misron1, Ng Wei Shin, Suhaidi Shafie

  • 1Department of Electrical and Electronic Engineering, Faculty of Engineering, Universiti Putra Malaysia, Serdang 43400, Malaysia. norhisam@eng.upm.edu.my

Sensors (Basel, Switzerland)
|February 21, 2012
PubMed
Summary
This summary is machine-generated.

This study introduces a mobile Hall sensor array system for detecting the shape of embedded ferromagnetic materials using magnetic flux leakage. The system successfully generates magnetic images to identify various material shapes, proving its practical application.

Keywords:
Mobile Hall Sensor Arrayferromagnetic material shapemagnetic flux distributionmagnetic flux leakagemagnetic imaging

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Area of Science:

  • Applied Physics
  • Materials Science
  • Non-Destructive Testing

Background:

  • Ferromagnetic materials embedded in structures pose challenges for detection.
  • Accurate shape determination of these materials is crucial for structural integrity assessments.
  • Existing methods may be invasive or lack real-time imaging capabilities.

Purpose of the Study:

  • To develop and validate a mobile Hall sensor array system for non-invasive ferromagnetic material shape detection.
  • To utilize the principle of magnetic flux leakage for imaging embedded objects.
  • To demonstrate the system's capability in real-time shape identification.

Main Methods:

  • A mobile Hall sensor array system was designed using two permanent magnets to generate magnetic flux.
  • Magnetic flux perturbation caused by ferromagnetic materials was detected by a 1-D Hall sensor array.
  • A signal processing unit and custom software were employed to construct 2-D magnetic images from sensor data.
  • Experimental validation involved testing with various geometric shapes and actual ferromagnetic objects.

Main Results:

  • The system successfully generated magnetic images reflecting the shapes of square, round, and triangular specimens.
  • Real-time magnetic imaging of actual ferromagnetic objects confirmed the system's functionality.
  • The voltage signal and magnetic flux distribution correlated with the detected shapes.
  • The mobile Hall sensor array system demonstrated high accuracy in shape detection.

Conclusions:

  • The developed mobile Hall sensor array system is effective for non-invasive shape detection of embedded ferromagnetic materials.
  • Magnetic flux leakage imaging provides a viable method for identifying material shapes in structures.
  • The system offers a practical solution for real-world applications in structural health monitoring and material identification.