Rayleigh Wave Velocity Measurements Using Broad Band Frequency Sources.

Abstract

Rayleigh wave velocities were measured for broad band noise excitation of ground surfaces. Two noise sources were used: a vibrator using band-passed filtered white noise and a hammer drop for impulses. The Rayleigh wave velocities were computed using Fourier analysis to determine phase differences between transducers located a fixed distance apart. Measurements with the impulsive source agreed with the vibrator measurements and showed good results for Rayleigh wave velocities over wide frequency bands. The impulsive source is recommended as a more field-expedient method for computing Rayleigh wave velocity as long as the transducers used do not saturate. Best results can be obtained using the averages of repeated impulses. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Jul 01, 1981
Accession Number
ADA102797

Entities

People

  • Otis Williams

Tags

Communities of Interest

  • Energy and Power Technologies
  • Sensors

DTIC Thesaurus Topics

  • Accuracy
  • Amplifiers
  • Data Analysis
  • Doppler Effect
  • Engineers
  • Frequency
  • Frequency Bands
  • Frequency Domain
  • Geophones
  • Instrumentation
  • Measurement
  • Rayleigh Waves
  • Recording Systems
  • Resonant Frequency
  • Surface Waves
  • Transducers
  • Waves

Fields of Study

  • Physics

Readers

  • Acoustics.
  • Combustion Dynamics and Shock Wave Physics.
  • Electromagnetic Wave Scattering and Antenna Radiation Engineering