Interactive demo · 3D turbulence from laser imaging

The solution

The panel above lays out the goal and the obstacle we face. Tomography is the answer: probe the volume from several angles with multiple lasers, reconstruct it with model based iterative reconstruction, then read off the integrated distortion over the central region.

Number of measurements7

1 3 7 11 15

Angle between adjacent beams3°

1° 2° 3°

Prior strengthmedium

none (FBP) low medium high

1 · Measurement geometry

7 laser probes crossing the volume

Geometryimg/geom_N07_a3.png

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2 · 7 distortion measurements

One line-of-sight distortion measurement per probe

Measurementsimg/views_N07_a3.png

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3 · MBIR tomographic reconstruction

Balances fit to the measurements against the prior model

Prior strength: just right

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Your reconstruction

4 · Full 3D reconstruction

MBIR estimate of the entire volume

3D reconstructionimg/recon_N07_a3_p2.png

Ground truth

True 3D volume

The real turbulent field

True volumeimg/truth_volume.png

↓isolate the central region (post-processing)

5 · Central region isolated

Same reconstruction, central region highlighted

Reconstruction with central region highlighted

Central regionimg/recon_roi_N07_a3_p2.png

True volume, region isolated

Same true field, central region highlighted

True volume with central region highlighted

Central regionimg/truth_volume_roi.png

↓integrate distortion over only the central region

6 · Central-region distortion

The integrated distortion over the central region, reconstruction vs. truth

Image percent error

Reconstruction

Recon distortionimg/dist_N07_a3_p2.png

compare
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Ground truth

True distortionimg/truth_dist.png

Estimating 3D turbulence from laser imaging