Seismic Scanning Tunneling Macroscope Gerard T. Schuster, Sherif M. Hanafy, and Yunsong Huang.

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Presentation transcript:

Seismic Scanning Tunneling Macroscope Gerard T. Schuster, Sherif M. Hanafy, and Yunsong Huang

Outline Introduction Motivation. Get super resolution by TRM Method. Time Reversal Mirrors (TRM) Field Test. Qademah Site Conclusions

Outline Introduction Motivation. Get super resolution by TRM Method. Time Reversal Mirrors (TRM) Field Test. Qademah Site Conclusions

Resolution Z Super Resolution ? L ΔxΔx Depth ΔxΔx Rayleigh Resolution:Abbe Resolution:

Outline Introduction Motivation. Get super resolution by TRM Method. Time Reversal Mirrors (TRM) Field Test. Qademah Site Conclusions

Motivation Motivation: Achieve super resolution IBM, 1986, Scanning Tunneling Microscope Problem: Source and receiver need to be in the near-field Solution: Use scatterer points Sample Key Idea: slight changes in sample topography lead to enormous changes in Amps, as long as stylus is within /2 of surface Scanning paths IBM

Outline Introduction Motivation. Get super resolution by TRM Method. Time Reversal Mirrors (TRM) Field Test. Qademah Site Conclusions

Time Reversal Mirrors (TRM) Image Plane

Time Reversal Mirrors (TRM) Migration Formula Image Plane Measured Data Measured Data Calculated Data TRM Profile

Point Scatterer Image Plane Target Location Trial Location

Point Scatterer S’ |s-s 0 | ~ S’ |s-s 0 | ~ /40 Near-field: super-resolutionFar-field: Rayleigh resolution

TRM Profile 1. Near Field Case, |s-s 0 | << 2. Far Field Case, |s-s 0 | =

Outline Introduction Motivation. Get super resolution by TRM Method. Time Reversal Mirrors (TRM) Field Test. Qademah Site Conclusions

Field Test X t SET 1: Raw Data X t SET 2: Raw Data + Scat. X t SET 3: Scattered Data

scatterer 24 geophones / line Rec. Line 1 Rec. Line 2 Rec. Line 3 Rec. Line 4 Rec. Line m 0.2 m 1 m 5 m 10 m 0.2 m 24 sources Rec. Line Experimental Setup

Site Photos

TRM Profiles Using SET 3 CSGs

TRM Profiles Before vs. After Scatterer SET 3 SET 1

TRM Profiles Bandpass test SET 3 SET 1

2 nd Field Experiment

Data Set # 1

Data Set # 2

Data Set # 3

TRM Profiles

Outline Introduction Motivation. Get super resolution by TRM Method. Time Reversal Mirrors (TRM) Field Test. Qademah Site Conclusions

TRM profiles have the shape of a sink curve if no scatterer in the near-field of the shot point TRM profiles have the shape of a spike if scatterer exists in the near-field of the shot point Field data shows that super resolution can be achieved if scatter points exists in the source near field S’ |s-s 0 | ~ S’ |s-s 0 | ~ /40

Points for future research What if scatter points are at the far field of both sources and receivers? Can we increase the resolution of migration images? Can we use SSP data?

Thank You Questions?