6 months at cwp: done a lot, but not done yet or: how to deal with black magic by dr. ernst...
TRANSCRIPT
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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 atBAM( 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:
But there was more than that!CWP Seminar, 2013-12-02 Niederleithinger 2
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Content
Things to be cared about in geophysics and NDT:
Events
Changes
Images
Where to go from here?
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Events
Seismics: Earthquakes, fracking,….
Concrete: Load induced cracks,…
Localization, Characterization
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Events
One tool: Time Reversal (Fink et al.)
Reciprocity
Inject time reversed signals at receivers
Energy will focus at source
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Events
One tool: Time Reversal (Fink et al.)
Reciprocity
Inject time reversed signals at receivers
Energy will focus at source
Improvement?Deconvolution!
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Does it really work? Experiment!
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Does it really work? Experiment!
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Setup: forward
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Data: forward
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Setup: backwards
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Data: backward
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Focus!
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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,….
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Simple experiments: subtle changes detected,but no localization!
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Localization is possible!
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Don’t believe it? Experiment!
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Don’t believe it? Experiment!
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Don’t believe it? Experiment!
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Results (“simple” CWI)
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Results (“simple” CWI)
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Preliminary Results (“advanced” CWI)
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Preliminary Results (“advanced” CWI)
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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!
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RTM
Ultrasonic black magic in TV
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SAFT imaging
Main contributors to SAFT: Langenberg, Mayer, Marklein,University of Kassel
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)
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Reverse Time Migration!
Sabine Müller Ernst Niederleithinger Maria Grohmann Martin Krause
Thomas Bohlen Paul Sava
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Synthetic example 1
RTM
Model used for simulating data
Velocity modelfor migration
RTM result
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Off to Horstwalde
Foundation slab at our test site
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Off to Horstwalde
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Off to Horstwalde
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Off to Horstwalde
Simulations
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Off to Horstwalde
Real data
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Back to the lab
Measurements:
• Polyamide block,(100*60*30 cm³)
• Point contact transducersin arrays of 4
• P, SHx, SHy
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Back to the lab
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Back to the lab
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Seismic Interferometry
Seismic Interferometry
• Reconstruction of Greens functions
• Data, where you think you don‘t have data
• Gerald Schuster• Roel Snieder
• Kees Wapenaar
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„Green‘s function retrieval“, „Seismic Interferometry“
Trace interpolation, synthetic example (44 sources)
Seismic Interferometry
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„Green‘s function retrieval“, „Seismic Interferometry“
Trace interpolation, synthetic example (44 sources)
Seismic Interferometry
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„Virtual Real Source“ (Behura, 2006)
synthetic example (11 sources)
Seismic Interferometry
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Back to the lab
Just more black magic? Experiment!
(on the way)
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That will be simple. Reality is much more complicated:
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Let‘s steal anotherblack magic idea:
Autofocusing
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Let‘s steal anotherblack magic idea:
Autofocusing
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