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Magnetic Field Due To A Thin Straight Wire01:28

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Consider an infinitely long straight wire carrying a current I. The magnetic field at point P at a distance a from the origin can be calculated using the Biot-Savart law.
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Magnetic Field Due to Two Straight Wires01:18

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In a magnetic field, moving charges encounter a force. If a wire contains these moving charges, i.e., if the wire is carrying a current, then a force acts on the wire as well. Consider a pair of flexible leads holding a wire that is 40 cm long and 10 g in weight in a horizontal position. The wire is placed in a constant magnetic field of 0.40 T, as shown in Figure 1(a). Determine the magnitude and direction of the current flowing in the wire needed to remove the tension in the supporting leads.
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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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Quantifying the Relative Thickness of Conductive Ferromagnetic Materials Using Detector Coil-Based Pulsed Eddy Current Sensors
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PT-Level High-Sensitivity Magnetic Sensor with Amorphous Wire.

Dongfeng He1

  • 1National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan.

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|January 1, 2020
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Summary
This summary is machine-generated.

A highly sensitive amorphous wire magnetic sensor was developed, achieving picotesla-level resolution. This advancement significantly improves magnetic field detection for applications like eddy current testing.

Keywords:
FeCoSiBamorphous wireeddy current testingmagnetic sensorresonant circuit

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Area of Science:

  • Materials Science
  • Electrical Engineering
  • Physics

Background:

  • High-sensitivity magnetic sensors are crucial for various scientific and industrial applications.
  • Amorphous magnetic materials offer unique properties for sensor development.

Purpose of the Study:

  • To develop a picotesla (PT) level high-sensitivity magnetic sensor using amorphous wire.
  • To enhance the sensor's performance through a resonant circuit and evaluate its application in eddy current testing.

Main Methods:

  • Fabrication of a magnetic sensor using a (FeCoSiB) amorphous wire (0.1 mm diameter, 5 mm length) with a 30-turn coil.
  • Biasing the sensor with a 1 MHz AC and DC current.
  • Incorporation of a resonant circuit to amplify the signal.
  • Development of an eddy current testing system utilizing the magnetic sensor.

Main Results:

  • Achieved a 10-fold increase in signal amplitude (10 mV/Gauss to ~100 mV/Gauss).
  • Improved magnetic field resolution by 5 times (30 pT/√Hz to 6 pT/√Hz).
  • Successfully evaluated artificial defects in an aluminum plate using the developed eddy current testing system.

Conclusions:

  • The developed amorphous wire magnetic sensor demonstrates high sensitivity and resolution at the picotesla level.
  • The integration of a resonant circuit significantly enhances sensor performance.
  • The sensor is effective for non-destructive testing applications, such as detecting defects in materials.