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Related Concept Videos

Magnetic Field due to Moving Charges01:23

Magnetic Field due to Moving Charges

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A stationary charge creates and interacts with the electric field, while a moving charge creates a magnetic field.
Consider a point charge moving with a constant velocity. Like the electric field, the magnetic field at any point is directly proportional to the magnitude of the charge and inversely proportional to the square of the distance between the source point and the field point. However, unlike the electric field, the magnetic field is always perpendicular to the plane containing the line...
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Magnetic Vector Potential01:15

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In electrostatics, the electric field can be written as the negative gradient of the potential. In magnetostatics, the zero divergence of the magnetic field ensures that the magnetic field can be expressed as the curl of a vector potential. This potential is known as the magnetic vector potential.
Consider an ideal solenoid with n turns per unit length and radius R. If I is the current through the solenoid, the magnetic field inside the solenoid is expressed as the product of vacuum...
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Magnetic Field Due to Two Straight Wires01:18

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Consider two parallel straight wires carrying a current of 10 A and 20 A in the same direction and separated by a distance of 20 cm. Calculate the magnetic field at a point "P2", midway between the wires. Also, evaluate the magnetic field when the direction of the current is reversed in the second wire.
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Magnetic Field Lines01:19

Magnetic Field Lines

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The representation of magnetic fields by magnetic field lines is very useful in visualizing the strength and direction of the magnetic field. Each of the magnetic field lines forms a closed loop. The field lines emerge from the north pole (N), loop around to the south pole (S), and continue through the bar magnet back to the north pole.
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Two-Dimensional (2D) NMR: Overview01:12

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The 1D NMR spectrum of large and complex molecules like natural products has complicated splitting patterns and overlapping signals, which can be easily interpreted using 2-dimensional (2D) NMR. Unlike 1D NMR, 2D NMR has two frequency axes that provide the coupling information between the nucleus A and nucleus B in a molecule. The process from which 2D spectra are obtained has four steps.
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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 Resonance Derived Myocardial Strain Assessment Using Feature Tracking
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Two-Dimensional Position Tracking Using Gradient Magnetic Fields.

Xuan Thang Trinh1, Jen-Tzong Jeng2, Huu-Thang Nguyen2

  • 1Faculty of Mechanical Engineering, Hung Yen University of Technology and Education, Hungyen 160000, Vietnam.

Sensors (Basel, Switzerland)
|July 27, 2022
PubMed
Summary
This summary is machine-generated.

A novel two-dimensional (2D) magnetic position-detection system was developed. This system achieves high accuracy (0.21% error) for precise 2D position sensing over a 200 mm x 200 mm range.

Keywords:
gradient magnetic fieldsinduction coilmagnetic trackingposition tracking

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Area of Science:

  • Magnetic sensing technologies
  • Instrumentation and measurement

Background:

  • Accurate two-dimensional (2D) position sensing is crucial for various scientific and industrial applications.
  • Existing methods may face limitations in accuracy, range, or complexity.

Purpose of the Study:

  • To design and fabricate a novel 2D position-detection device.
  • To achieve high accuracy and an extended linear range for position sensing.

Main Methods:

  • Utilized a single-axis magnetic sensor (induction coil and GMR spin-valve sensor) with orthogonal gradient coils.
  • Analyzed magnetic field profiles numerically to optimize the detection area.
  • Employed a digital dual-phase lock-in detector and a linearity correction algorithm.

Main Results:

  • Achieved a mean positioning error of 0.417 mm, representing a relative error of 0.21%.
  • Demonstrated a functional working range of 200 mm × 200 mm.
  • The linearity correction algorithm significantly improved location accuracy.

Conclusions:

  • The developed 2D magnetic position-detection system shows high promise for applications demanding precise position control.
  • The system offers a viable solution for accurate tracking in a defined 2D space.