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Related Concept Videos

Projectile Motion: Example01:18

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The theory of projectile motion is very useful for players of several sports to improve their performance. For example, a javelin thrower needs to throw their javelin in such a way that it travels as far as possible. The javelin thrower takes a short run-up to increase the initial speed of the javelin. The range of a projectile is at its maximum at a 45° angle so javelin throwers try to angle their throw as close to 45° as possible.
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Drugs target macromolecules to modify ongoing cellular processes. Primary drug targets include receptors, ion channels, transporters, and enzymes.
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Related Experiment Video

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Scattering And Absorption of Light in Planetary Regoliths
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Focusing on moving targets through scattering samples.

Edward Haojiang Zhou1, Haowen Ruan1, Changhuei Yang1

  • 1Departments of Electrical Engineering and Bioengineering, California Institute of Technology, Pasadena, California 91125, USA.

Optica
|January 27, 2015
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Summary
This summary is machine-generated.

Researchers developed a new method called TRACK to focus light through scattering media using moving objects as a reference. This technique enables noninvasive imaging and particle counting in challenging environments without external guide stars.

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Area of Science:

  • Biomedical optics
  • Wave phenomena
  • Optical imaging

Background:

  • Focusing light through scattering media is crucial for biomedical applications.
  • Existing methods like wavefront shaping and optical time-reversal face challenges with noninvasive reference beacons.
  • A key challenge is achieving efficient light focusing within scattering media without external guide stars.

Purpose of the Study:

  • To introduce a novel technique for optical time-reversal focusing.
  • To demonstrate noninvasive light focusing and particle counting in scattering media.
  • To overcome limitations of current methods for focusing light through scattering environments.

Main Methods:

  • Developed Time Reversal by Analysis of Changing wavefronts from Kinetic targets (TRACK) technique.
  • Utilized the difference between time-varying scattering fields caused by moving objects.
  • Applied optical time reversal principles to reconstruct the light path.

Main Results:

  • Achieved optical time-reversal focusing using the TRACK method.
  • Demonstrated successful focusing with discretely moved objects and particles in aqueous flow.
  • Obtained a focal peak-to-background strength of 204.
  • Showcased noninvasive particle counting in a flow-cytometry setup, even behind diffusers.

Conclusions:

  • The TRACK technique enables noninvasive optical time-reversal and focusing without external guide stars.
  • This method leverages intrinsic sample characteristics for light manipulation.
  • Paves the way for advanced scattering media imaging, including underwater, atmospheric, and in vivo flow cytometry applications.