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Edge detection of high temperature plasmas

Edge detection of high temperature plasmas. Laurence Choi Sean Burke. Plasmas are all over the place. High temperature Often transient Major focus of energy research. UW has 3 major fusion expts. HSX MST Pegasus Short pulse periods Transient instabilities Equilibrium Calculations.

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Edge detection of high temperature plasmas

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  1. Edge detection of high temperature plasmas Laurence Choi Sean Burke

  2. Plasmas are all over the place • High temperature • Often transient • Major focus of energy research

  3. UW has 3 major fusion expts. • HSX • MST • Pegasus • Short pulse periods • Transient instabilities • Equilibrium Calculations

  4. Equilibria for stability, Te and Ne • Fast (>1kHz) imaging required • Mild distortion from lens • Two measurments: • Qualitative • Quantitative

  5. Qualitative • Fast measurement • Preconfigured mask • Recalibrate camera adjustments • Integrate rows • Find max ∂I/∂x

  6. Qualitative • Fiducial mark • Define coords • CS is R = 0 • Draw grid • F-th inversion?

  7. Plasma Detection Main Problems • Background (e.g.walls) • Distinguishing edges Methods used • Sobel Operator • Closing • Region Filling • Boundary Extraction

  8. Emphasize Edges • Emphasize horizontal edges using Sobel Operator:

  9. Filling in the Gaps • Fill in the gaps using the closing operation: dilation followed by erosion: A = Sobel Edges of Image B =

  10. Removing Background Noise • Region Filling • Shortcut: in every frame there are regions where we don’t care about the fidelity: paint over in white/black.

  11. Boundary Extraction • Morphological Boundary operator used to determine the edges of the plasma. Note that small anomalies still exist.

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