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Simultaneous Measurement of Turbulence and Particle Kinematics Using Flow Imaging Techniques
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Published on: March 12, 2019

Imaging through turbulence using compressive coherence sensing.

Ashwin A Wagadarikar1, Daniel L Marks, Kerkil Choi

  • 1Department of Electrical and Computer Engineering, Duke University, Durham, North Carolina 27708, USA.

Optics Letters
|March 19, 2010
PubMed
Summary
This summary is machine-generated.

Estimating sparse objects imaged through atmospheric turbulence is possible using a 2D slice of mutual intensity. This method, utilizing a rotational shear interferometer, bypasses exhaustive coherence function sampling for improved imaging.

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Area of Science:

  • Optical physics
  • Adaptive optics
  • Image processing

Background:

  • Turbulence causes isoplanatic distortion, affecting remote object imaging.
  • Previous methods jointly estimated distortion and object images from 4D mutual intensity.
  • Full 4D mutual intensity sampling is computationally intensive.

Purpose of the Study:

  • To demonstrate that a 2D slice of mutual intensity is sufficient for object and turbulence estimation.
  • To develop a computationally efficient method for imaging through turbulence.
  • To enable new systems for inferring object properties without exhaustive sampling.

Main Methods:

  • Utilized a rotational shear interferometer to measure a 2D slice of the 4D mutual intensity.
  • Applied decompressive inference on the 2D slice data.
  • Employed an iterative algorithm alternating between object and phase screen estimation.

Main Results:

  • Successfully estimated sparse objects imaged through turbulence using only a 2D slice of mutual intensity.
  • The iterative algorithm effectively separated object and turbulence-induced phase screen.
  • Demonstrated sufficiency of reduced data for accurate reconstruction.

Conclusions:

  • A 2D slice of mutual intensity, acquired via rotational shear interferometry, is adequate for reconstructing sparse objects through turbulence.
  • Decompressive inference offers an efficient alternative to full 4D mutual intensity analysis.
  • This technique advances the field of turbulence compensation in optical imaging.