Buried-Target Detection Using Time-Reversed Acoustics

Presentation Outline

Motivation

Work to Date

Iterative Time-Reversal Process

Linear Acoustic Equation

How TR Works: Green's Functions

iTRO Backscatter

Acoustic Time Reversal vs. Optical Phase Conjugation

Model Used for Simulations

Spheres as the Target

Scattering by a Sphere: General Setup

Scattering by Sphere: Impulse Response

Time Reversal Backscattered Sphere

Scattering by Sphere: Cosine Pulse

Sediments Studied

Initial Pulses Studied

First Return

50th Return

Signal to Noise Ratio (SNR)

iTR Process and TR Windows

TR Windows: First Series

SNR for First TR Window Test

TR Window Study 2

TR Window SNRs

Sediment Effects

Conclusions

Future Possibilities for TR

Acknowledgments