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Related Concept Videos

Angular Momentum01:21

Angular Momentum

Angular momentum characterizes an object's rotational motion and is defined as the moment of its linear momentum about a specified point O. When a particle moves along a curved path in the x-y plane, the scalar formulation calculates the magnitude of its angular momentum, utilizing the moment arm (d), representing the perpendicular distance from point O to the line of action of the linear momentum. Despite being scalar in formulation, angular momentum is inherently a vector quantity. Its...
Angular Momentum: Single Particle01:10

Angular Momentum: Single Particle

Angular momentum is directed perpendicular to the plane of the rotation, and its magnitude depends on the choice of the origin. The perpendicular vector joining the linear momentum vector of an object to the origin is called the “lever arm.” If the lever arm and linear momentum are collinear, then the magnitude of the angular momentum is zero. Therefore, in this case, the object rotates about the origin such that it lies on the rim of the circumference defined by the lever arm magnitude.
The...
Conservation of Angular Momentum: Application01:18

Conservation of Angular Momentum: Application

A system's total angular momentum remains constant if the net external torque acting on the system is zero. Examples of such systems include a freely spinning bicycle tire that slows over time due to torque arising from friction, or the slowing of Earth's rotation over millions of years due to frictional forces exerted on tidal deformations. However in the absence of a net external torque, the angular momentum remains conserved. The conservation of angular momentum principle requires a change...
Conservation of Angular Momentum01:09

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A system's total angular momentum remains constant if the net external torque acting on the system is zero. Considering a system that consists of n tiny particles, the angular momentum of any tiny particle may change, but the system's total angular momentum would remain constant. The principle of conservation of angular momentum only considers the net external torque acting on the system. While there are internal forces exerted by different particles within the system that also produce internal...
Relation Between Moment of a Force and Angular Momentum01:21

Relation Between Moment of a Force and Angular Momentum

In the realm of spinning tops, the application of force at a distance from the center produces torque, a pivotal factor that alters the angular momentum of the top, thereby inducing its rotation. The concept of moment, akin to linear force in rotation, quantifies how a force acting upon an object initiates rotational motion. Angular momentum serves as the rotational counterpart to linear momentum, representing an object's inherent tendency to persist in its rotational state.
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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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Construction and Operation of a Light-driven Gold Nanorod Rotary Motor System
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Published on: June 30, 2018

Detection of a spinning object using light's orbital angular momentum.

Martin P J Lavery1, Fiona C Speirits, Stephen M Barnett

  • 1School of Physics and Astronomy, Scottish Universities Physics Alliance (SUPA), University of Glasgow, Glasgow, UK. martin.lavery@glasgow.ac.uk

Science (New York, N.Y.)
|August 3, 2013
PubMed
Summary

Researchers discovered a new frequency shift for detecting object rotation using light's orbital angular momentum. This method offers enhanced remote sensing capabilities for spinning bodies in various settings.

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Area of Science:

  • Optics and Photonics
  • Angular Momentum Physics

Background:

  • Linear Doppler shift is a standard method for measuring object velocity.
  • Current methods cannot detect object rotation using Doppler shift.

Purpose of the Study:

  • To develop a novel method for detecting object rotation.
  • To analyze the frequency shift induced by light's orbital angular momentum interacting with spinning objects.

Main Methods:

  • Analysis of orbital angular momentum (OAM) of scattered light.
  • Observation of frequency shifts from a spinning object.

Main Results:

  • A rotational frequency shift was observed, proportional to object rotation frequency and light's OAM.
  • The shift was detected even when the OAM vector was parallel to the observation direction.

Conclusions:

  • Orbital angular momentum of light can detect object rotation.
  • This rotational frequency shift has potential applications in remote sensing of spinning objects.