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Related Concept Videos

Gyroscope01:02

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A gyroscope is defined as a spinning disk in which the axis of rotation is free to assume any orientation. When spinning, the orientation of the spin axis is unaffected by the orientation of the body that encloses it. The body or vehicle enclosing the gyroscope can be moved from place to place, while the orientation of the spin axis remains the same. This makes gyroscopes very useful in navigation, especially where magnetic compasses cannot be used, such as in crewed and crewless spacecraft,...
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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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Consider an external electric field propagating through a homogeneous medium. When the electric field crosses the surface boundary of the medium, it undergoes a discontinuity. The electric field can be resolved into normal and tangential components. The amount by which the field changes at any boundary is given by the difference between the field components above and below the surface boundary.
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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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Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...
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In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
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Spin Rate Effects in a Micromachined Electrostatically Suspended Gyroscope.

Boqian Sun1, Shunyue Wang2, Yidong Tan3

  • 1Department of Precision Instrument, Tsinghua University, Beijing 100084, China. sunboqian@mail.tsinghua.edu.cn.

Sensors (Basel, Switzerland)
|November 15, 2018
PubMed
Summary

Optimizing the spin rate of microelectromechanical systems (MEMS) gyroscopes significantly enhances performance. Operating at an optimal spin rate improves angular rate sensor accuracy and stability.

Keywords:
MEMSbias instabilityelectrostatic suspensionmicromachined spinning-rotor gyroscopenoiseresolutionscale factorspin rate

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Area of Science:

  • Engineering
  • Physics
  • Materials Science

Background:

  • Spin rate is critical for high-speed spinning-rotor gyroscope performance.
  • Microelectromechanical systems (MEMS) gyroscopes offer compact angular rate sensing capabilities.

Purpose of the Study:

  • To investigate the impact of spin rate on MEMS gyroscope performance indicators.
  • To derive theoretical models for scale factor and measurement range.
  • To propose a testing strategy for analyzing spin rate effects.

Main Methods:

  • Theoretical modeling of scale factor and measurement range.
  • Experimental validation of theoretical predictions.
  • Analysis of gyroscope output noise in relation to control loop voltage.

Main Results:

  • Experimental scale factor measurements align with theoretical predictions.
  • Gyroscope output noise is proportional to the squared drive voltage of the control loop.
  • Different spin rates reveal the influence of the rotation control loop.

Conclusions:

  • Spin rate significantly affects MEMS gyroscope performance metrics.
  • An optimal spin rate can be identified to improve gyroscope performance.
  • Understanding spin rate effects is crucial for advanced angular rate sensor design.