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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.
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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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...
Magnetic Declination01:19

Magnetic Declination

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...
Compass01:23

Compass

The compass is a fundamental instrument that operates by aligning its magnetic needle with Earth's magnetic field. This alignment facilitates navigation and orientation, offering a means to determine direction relative to magnetic north. However, the magnetic needle points to magnetic north, which differs slightly from true geographic north due to magnetic declination, which is the angular deviation between these two points. Declination varies based on geographic location and shifts over time...
Magnetic Vector Potential01:15

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Optimized Setup and Protocol for Magnetic Domain Imaging with In Situ Hysteresis Measurement
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Published on: November 7, 2017

Optimizing a direct string magnetic gradiometer for geophysical exploration.

Andrew Sunderland1, Li Ju, David G Blair

  • 1School of Physics, University of Western Australia, 35 Stirling Highway, Crawley, Western Australia 6009, Australia. asund@physics.uwa.edu.au

The Review of Scientific Instruments
|November 10, 2009
PubMed
Summary

This study introduces a novel direct string magnetic gradiometer for geophysical exploration. This innovative sensor achieves high sensitivity and common mode rejection, paving the way for next-generation geophysical tools.

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Area of Science:

  • Geophysics
  • Sensor Technology
  • Instrumentation

Background:

  • Traditional magnetic gradiometers rely on differencing two magnetometers, necessitating complex balancing for common mode rejection.
  • Direct measurement of magnetic gradients offers a simplified and potentially more sensitive approach.

Purpose of the Study:

  • To present a unique magnetic gradiometer that directly measures magnetic gradients using a single string sensing element.
  • To detail the critical parameters influencing the performance of this novel magnetic gradiometer.
  • To outline the design for a next-generation sensor with enhanced sensitivity and low power consumption.

Main Methods:

  • Utilizing a single string as the sensing element to directly detect magnetic gradients.
  • Inducing second harmonic string vibrations through magnetic gradients for measurement.
  • Optimizing parameters such as current, temperature, and pressure to enhance sensitivity.
  • Investigating heat dissipation and air damping effects on sensor performance.

Main Results:

  • Achieved a sensitivity of 0.18 nT/m/√Hz by combining high current, elevated temperature, and low pressure.
  • Demonstrated inherent high common mode rejection due to the direct measurement principle.
  • Proposed a design for a next-generation sensor targeting 0.01 nT/m/√Hz sensitivity with only 1W power.
  • Outlined the potential for deploying full tensor magnetic gradiometers for airborne geophysical applications.

Conclusions:

  • The direct string magnetic gradiometer offers a significant advancement over traditional methods.
  • The developed technology shows promise for highly sensitive airborne geophysical exploration.
  • Future iterations are expected to further improve sensitivity and reduce power requirements.