Standoff Acoustic Shear Wave Imaging Using LFM Chirps

Abstract

Shear wave seismic-acoustic imaging incorporating laser Doppler vibrometers (LDV) has been successfully used to detect buried landmines using single tone excitation. In this paper, the use of linear frequency modulated (LFM) chirps is proposed to exploit wideband resonant behavior. This technique captures more information about complex elastic inhomogeneities while being more tolerant to noise.

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Document Details

Document Type
Technical Report
Publication Date
Mar 21, 2011
Accession Number
ADA632772

Entities

People

  • Glenwood Garner
  • Michael Steer

Organizations

  • North Carolina State University

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies
  • Sensors

DTIC Thesaurus Topics

  • Acoustics
  • Detection
  • Doppler Effect
  • Excitation
  • Frequency
  • Land Mines
  • Laser Doppler Vibrometers
  • Materials
  • Mechanical Properties
  • Modulus Of Elasticity
  • Plane Waves
  • Polystyrenes
  • Scattering
  • Secondary Waves
  • Standoff
  • Time Domain
  • Waves

Fields of Study

  • Physics

Readers

  • Acoustics.
  • Sensor Fusion and Tracking Systems.
  • Wave Propagation and Nonlinear Chaotic Dynamics.

Technology Areas

  • Directed Energy