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Related Concept Videos

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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Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

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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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Gyroscope: Precession01:24

Gyroscope: Precession

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Precession can be demonstrated effectively through a spinning top. If a spinning top is placed on a flat surface near the surface of the Earth at a vertical angle and is not spinning, it will fall over due to the force of gravity producing a torque acting on its center of mass. However, if the top is spinning on its axis, it precesses about the vertical direction, rather than topple over due to this torque. Precessional motion is a combination of a steady circular motion of the axis and the...
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Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
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Atomic Nuclei: Larmor Precession Frequency01:11

Atomic Nuclei: Larmor Precession Frequency

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The earth's gravitational field produces a 'twisting force' perpendicular to the angular momentum of a spinning mass (such as a spinning top) that causes the mass to 'wobble' around the gravitational field axis in a phenomenon called precession. Similarly, the magnetic moment (μ) of a spinning nucleus precesses due to an external magnetic field directed along the z-axis. The precession of the magnetic moment vector about the magnetic field is called Larmor precession,...
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NMR Spectroscopy: Spin–Spin Coupling01:08

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The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved...
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Hyperpolarized Xenon for NMR and MRI Applications
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Combined Polarization/Magnetic Modulation of a Transverse NMR Gyroscope.

Susan S Sorensen1, Thad G Walker1

  • 1Department of Physics, University of Wisconsin-Madison, Madison, WI 53706, USA.

Sensors (Basel, Switzerland)
|July 11, 2023
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Summary

This study introduces a novel hybrid modulation technique for continuous operation of spin-exchange optically pumped NMR gyroscopes. The method enables simultaneous excitation of Xenon isotopes, achieving precise rotation rate measurements with high common-field suppression.

Keywords:
NMRSEOPgyroscope

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Area of Science:

  • Atomic, Molecular, and Optical Physics
  • Quantum Sensing
  • Inertial Navigation

Background:

  • Spin-exchange optically pumped (SEOP) NMR gyroscopes offer high sensitivity for rotation sensing.
  • Continuous operation and simultaneous multi-species excitation remain challenges for SEOP gyroscopes.

Purpose of the Study:

  • To develop and demonstrate a new approach for continuous operation of a transverse SEOP NMR gyroscope.
  • To achieve simultaneous, continuous excitation and real-time measurement of multiple Xenon isotopes (¹³¹Xe and ¹²⁹Xe).

Main Methods:

  • Implementation of a hybrid modulation technique involving both applied bias field and optical pumping modulation.
  • Real-time demodulation of Xenon (Xe) precession signals using a custom least-squares fitting algorithm.
  • Utilizing ¹³¹Xe and ¹²⁹Xe for simultaneous rotation rate measurements.

Main Results:

  • Demonstrated simultaneous, continuous excitation of ¹³¹Xe and ¹²⁹Xe.
  • Achieved a common field suppression factor of approximately 1400.
  • Reported an angle random walk of 21 μHz/√Hz and bias instability of ~480 nHz after 1000 seconds.

Conclusions:

  • The hybrid modulation approach enables continuous, simultaneous multi-species operation of SEOP NMR gyroscopes.
  • The demonstrated performance metrics indicate significant advancements in gyroscope stability and accuracy.
  • This technique holds promise for improved inertial navigation and fundamental physics applications.