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Related Concept Videos

Magnetic Damping01:17

Magnetic Damping

883
Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...
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Atomic Nuclei: Nuclear Relaxation Processes01:23

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In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis.
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Diamagnetic Shielding of Nuclei: Local Diamagnetic Current01:14

Diamagnetic Shielding of Nuclei: Local Diamagnetic Current

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An applied magnetic field causes the electrons present in the molecule to circulate, setting up a local diamagnetic current within the molecule. The local diamagnetic current arising from circulating sigma-bonding electrons induces a magnetic field, Blocal that opposes the applied magnetic field, B0. The effective magnetic field experienced by these nuclei is given by the difference between the applied and local magnetic fields in a phenomenon called local diamagnetic shielding. Essentially,...
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Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

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The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
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Magnetic Field Of A Current Loop01:16

Magnetic Field Of A Current Loop

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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 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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Suppression of current source noise with an atomic magnetometer.

Liang Shen1, Rui Zhang2, Teng Wu2

  • 1Institute of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing 100876, China.

The Review of Scientific Instruments
|September 3, 2020
PubMed
Summary

This study presents a novel method using atomic magnetometers to suppress current noise, achieving approximately 27 dB reduction. Enhanced sensitivity and magnetic noise control can further improve this noise suppression technique.

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Area of Science:

  • Physics
  • Metrology
  • Instrumentation

Background:

  • Current source noise poses challenges in sensitive measurements.
  • Atomic magnetometers offer high sensitivity for magnetic field detection.

Purpose of the Study:

  • To introduce a novel method for suppressing current source noise using atomic magnetometers.
  • To quantify the noise-suppression performance of the proposed technique.

Main Methods:

  • Employing a lamp-pumped cesium atomic magnetometer for noise suppression.
  • Utilizing a higher-sensitivity laser-pumped cesium atomic magnetometer for noise measurement.
  • Comparing noise levels before and after suppression at a 50 mA output current.

Main Results:

  • Achieved a noise-suppression ratio of approximately 27 dB.
  • Demonstrated the feasibility of using atomic magnetometers for active noise control.
  • Identified sensitivity and ambient magnetic noise control as key factors for performance enhancement.

Conclusions:

  • The developed method effectively suppresses current source noise.
  • The technique holds potential for applications in metrology and fundamental physics.
  • Further improvements are possible through enhanced magnetometer sensitivity and magnetic noise mitigation.