Geophysical Diffraction Tomography: Theory Implementation and Results

Abstract

Geophysical diffraction tomography (GDT) is a high resolution technique for quantitative subsurface imaging. The method is based on the analysis of data acquired from the propagation of scalar waves from an array of source positions to an array of receiver positions. Images of spatial variations in refractive index are produced by a procedure which propagates the received signal backwards through a subsurface cross-section. This is conceptually similar to the elements of optical holography. An acoustic-based GDT imaging procedure has been implemented using a specially developed data acquisition system employing a source deployed on the ground surface and an array of 29 hydrophones that are emplaced in a borehole. Confirmatory field studies have demonstrated that GDT can successfully image naturally-occurring and man-made buried features.

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Document Details

Document Type
Technical Report
Publication Date
Nov 01, 1992
Accession Number
ADA460633

Entities

People

  • Alan Witten

Organizations

  • Oak Ridge National Laboratory

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Acoustic Waves
  • Computers
  • Data Acquisition
  • Data Analysis
  • Detection
  • Detectors
  • Diffraction
  • Environment
  • Environmental Protection
  • High Resolution
  • Measurement
  • Personal Computers
  • Scattering
  • Signal Processing
  • Two Dimensional
  • Wave Propagation
  • X-Ray Computed Tomography

Fields of Study

  • Physics

Readers

  • Acoustical Oceanography.
  • Geotechnical Engineering.
  • Medical Imaging.