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Related Concept Videos

Local Attraction01:22

Local Attraction

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Local attraction refers to disturbances in compass readings caused by magnetic influences from nearby objects such as metal fences, buried pipes, vehicles, buildings, power lines, or natural iron ore deposits. Small items like wristwatches, steel tools, or belt buckles can also interfere with the compass by creating local magnetic fields that distort the Earth's natural magnetic field. These distortions lead to inaccurate readings, posing navigation and land surveying challenges.Local...
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Magnetic Declination01:19

Magnetic Declination

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Magnetic declination is the angle between true north, which aligns with the Earth's rotational axis, and magnetic north, which follows the direction of the Earth's magnetic field. This discrepancy exists because the magnetic poles do not coincide with the geographic poles. The value of magnetic declination depends on the observer's location on Earth and is subject to changes over time due to the dynamic nature of the Earth's magnetic field.The declination is called eastern when magnetic north...
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Magnetic Field Of A Current Loop01:16

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Consider a circular loop with a radius a, that carries a current I. The magnetic field due to the current at an arbitrary point P along the axis of the loop can be calculated using the Biot-Savart law.
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Magnetic Susceptibility and Permeability01:31

Magnetic Susceptibility and Permeability

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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.
When diamagnetic materials are placed under an external magnetic field, the moments opposite to the field are induced. Hence, the susceptibility for diamagnets has a minimal negative value of 10-5–10-6. Since...
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Diamagnetism01:26

Diamagnetism

2.4K
Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets....
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Magnetic Force On A Current-Carrying Conductor01:25

Magnetic Force On A Current-Carrying Conductor

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Moving charges experience a force in a magnetic field. Since the magnetic fields produced by moving charges are proportional to the current, a conductor carrying a current creates a magnetic field around it.
Consider a compass placed near a current-carrying wire. The wire experiences a force that aligns the needle of the compass tangentially around the wire. Thus, the current-carrying wire produces concentric circular loops of magnetic field. The magnetic field generated by a wire can be...
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Related Experiment Video

Updated: Jun 22, 2025

Frequency Mixing Magnetic Detection Scanner for Imaging Magnetic Particles in Planar Samples
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Determinants of Maximum Magnetic Anomaly Detection Distance.

Hangcheng Li1, Jiaming Luo1, Jiajun Zhang2

  • 1Sino-German College of Intelligent Manufacturing, Shenzhen Technology University, Shenzhen 518118, China.

Sensors (Basel, Switzerland)
|June 27, 2024
PubMed
Summary

Larger magnetic objects and finer sensor resolution extend magnetic anomaly detection (MAD) distance. This study quantifies this relationship, developing a formula for optimal sensor configuration and detection range estimation.

Keywords:
detection distancemagnetic anomaly detectionmagnetic objectmagnetic sensor

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Area of Science:

  • Geophysics
  • Applied Magnetism
  • Remote Sensing

Background:

  • Magnetic Anomaly Detection (MAD) is crucial for identifying submerged or concealed objects.
  • Current understanding of MAD's detection range relies on intuition rather than quantitative analysis.
  • Key factors influencing detection distance include object size, magnetization, and sensor resolution.

Purpose of the Study:

  • To quantitatively investigate the relationship between magnetic anomaly detection distance and object size/measurement resolution.
  • To develop a predictive model for maximum detectable distance in MAD.
  • To establish an empirical formula for optimizing sensor configuration and estimating detection capabilities.

Main Methods:

  • Conducted unmanned aerial vehicle-based MAD field experiments using cargo vessels and NdFeB magnets.
  • Developed and calibrated isometric finite element models based on experimental data.
  • Utilized parametric sweeping on calibrated models to generate a detectable distance map.

Main Results:

  • Established a quantitative relationship between detectable distance, object size, and measurement resolution.
  • Found that detectable distance logarithmically increases with object size and decreases with resolution.
  • Developed a three-parameter empirical formula (distance-size-resolution logarithmic relationship).

Conclusions:

  • The developed empirical formula accurately predicts MAD performance based on object size and sensor resolution.
  • This formula enables optimization of sensor configuration for specific detection tasks.
  • It aids in estimating maximum detection distances and minimum detectable object sizes.