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Motivation to come here:

6 months at CWP: Done a lot, but not done yet Or: how to deal with black magic by Dr. Ernst Niederleithinger Senior Scientist and Deputy Division Leader at BAM( Federal Institute for Materials Research and Testing) Berlin, Germany Visiting Research Professor at Colorado School of Mines.

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Motivation to come here:

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  1. 6 months at CWP: Done a lot, but not done yetOr: how to deal with black magicbyDr. Ernst NiederleithingerSenior Scientist and Deputy Division Leader atBAM( Federal Institute for Materials Research and Testing)Berlin, GermanyVisiting Research Professor at Colorado School of Mines CWP Seminar, 2013-12-02 Niederleithinger 1

  2. Motivation to come here: But there was morethanthat! CWP Seminar, 2013-12-02 Niederleithinger 2

  3. Content • Things to be cared about in geophysics and NDT: • Events • Changes • Images • Where to go from here? CWP Seminar, 2013-12-02 Niederleithinger 3

  4. Events • Seismics: Earthquakes, fracking,…. • Concrete: Load induced cracks,… • Localization, Characterization CWP Seminar, 2013-12-02 Niederleithinger 4

  5. Events • Onetool: Time Reversal (Fink et al.) • Reciprocity • Inject time reversedsignalsatreceivers • Energy will focusatsource CWP Seminar, 2013-12-02 Niederleithinger 5

  6. Events • One tool: Time Reversal (Fink et al.) • Reciprocity • Inject time reversed signals at receivers • Energy will focus at source • Improvement?Deconvolution! CWP Seminar, 2013-12-02 Niederleithinger 6

  7. Does it really work? Experiment! CWP Seminar, 2013-12-02 Niederleithinger 7

  8. Does it really work? Experiment! CWP Seminar, 2013-12-02 Niederleithinger 8

  9. Setup: forward CWP Seminar, 2013-12-02 Niederleithinger 9

  10. Data: forward CWP Seminar, 2013-12-02 Niederleithinger 10

  11. Setup: backwards CWP Seminar, 2013-12-02 Niederleithinger 11

  12. Data: backward CWP Seminar, 2013-12-02 Niederleithinger 12

  13. Focus! CWP Seminar, 2013-12-02 Niederleithinger 13

  14. Next topic: Changes • Seismics: stress, oil/gas content,…. • Concrete: stress, degradation,…. • Both: Detect it as early as possible! • „Global“ changes: Coda Wave Interferometry • Localization? Ideas by Pacheco & Snieder, Larose, Sens-Schönfelder,…. CWP Seminar, 2013-12-02 Niederleithinger 14

  15. Simple experiments: subtle changes detected,but no localization! CWP Seminar, 2013-12-02 Niederleithinger 15

  16. Localization is possible! CWP Seminar, 2013-12-02 Niederleithinger 16

  17. Don’t believe it? Experiment! CWP Seminar, 2013-12-02 Niederleithinger 17

  18. Don’t believe it? Experiment! CWP Seminar, 2013-12-02 Niederleithinger 18

  19. Don’t believe it? Experiment! CWP Seminar, 2013-12-02 Niederleithinger 19

  20. Results (“simple” CWI) CWP Seminar, 2013-12-02 Niederleithinger 20

  21. Results (“simple” CWI) CWP Seminar, 2013-12-02 Niederleithinger 21

  22. Preliminary Results (“advanced” CWI) CWP Seminar, 2013-12-02 Niederleithinger 22

  23. Preliminary Results (“advanced” CWI) CWP Seminar, 2013-12-02 Niederleithinger 23

  24. Last but not least: Imaging • Seismics: Layers, structures, hydrocarbons • Concrete: rebars, tendons, voids, cracks,… • Both: Mapping (multiple) reflections recorded close to/at the surface to where they belong! Same math+physics! CWP Seminar, 2013-12-02 Niederleithinger 24

  25. RTM Ultrasonic black magic in TV CWP Seminar, 2013-12-02 Niederleithinger 25

  26. SAFT imaging Friese et al., SMT 2008 • Synthetic aperture focusing technique • Family of methods • Constant and multi-offset data • Direct reflections only • Phase evaluation possible (Krause et al., SF&R 2008) Main contributors to SAFT: Langenberg, Mayer, Marklein, University of Kassel CWP Seminar, 2013-12-02 Niederleithinger 26

  27. Reverse Time Migration! Sabine Müller Ernst Niederleithinger Maria Grohmann Martin Krause Thomas Bohlen Paul Sava CWP Seminar, 2013-12-02 Niederleithinger 27

  28. RTM Synthetic example 1 Model used for simulating data Velocity modelfor migration RTM result CWP Seminar, 2013-12-02 Niederleithinger 28

  29. Off to Horstwalde Foundation slab at our test site CWP Seminar, 2013-12-02 Niederleithinger 29

  30. Off to Horstwalde CWP Seminar, 2013-12-02 Niederleithinger 30

  31. Off to Horstwalde CWP Seminar, 2013-12-02 Niederleithinger 31

  32. Off to Horstwalde Simulations CWP Seminar, 2013-12-02 Niederleithinger 32

  33. Off to Horstwalde Real data CWP Seminar, 2013-12-02 Niederleithinger 33

  34. Back to the lab • Measurements: • Polyamide block,(100*60*30 cm³) • Point contact transducersin arrays of 4 • P, SHx, SHy CWP Seminar, 2013-12-02 Niederleithinger 34

  35. Back to the lab CWP Seminar, 2013-12-02 Niederleithinger 35

  36. Back to the lab CWP Seminar, 2013-12-02 Niederleithinger 36

  37. Seismic Interferometry Seismic Interferometry • Reconstruction of Greens functions • Data, where you think you don‘t have data • Gerald Schuster • Roel Snieder • Kees Wapenaar CWP Seminar, 2013-12-02 Niederleithinger 37

  38. Seismic Interferometry „Green‘s function retrieval“, „Seismic Interferometry“ Trace interpolation, synthetic example (44 sources) CWP Seminar, 2013-12-02 Niederleithinger 38

  39. Seismic Interferometry „Green‘s function retrieval“, „Seismic Interferometry“ Trace interpolation, synthetic example (44 sources) CWP Seminar, 2013-12-02 Niederleithinger 39

  40. Seismic Interferometry „Virtual Real Source“ (Behura, 2006) synthetic example (11 sources) CWP Seminar, 2013-12-02 Niederleithinger 40

  41. Back to the lab Just more black magic? Experiment! (on the way) CWP Seminar, 2013-12-02 Niederleithinger 41

  42. That will be simple. Reality is much more complicated: CWP Seminar, 2013-12-02 Niederleithinger 42

  43. Let‘s steal anotherblack magic idea: Autofocusing CWP Seminar, 2013-12-02 Niederleithinger 43

  44. Let‘s steal anotherblack magic idea: Autofocusing CWP Seminar, 2013-12-02 Niederleithinger 44

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