Tests of Backscatter Coefficient Measurement Using Broadband Pulses

Jian Feng Chen, James A. Zagzebski, Ernest L. Madsen

Research output: Contribution to journalArticlepeer-review

49 Scopus citations

Abstract

An adaptation to a data reduction method is outlined for determining backscatter coefficients, η when broad bandwidth pulses are employed. The accuracy of these η values is assessed with well-characterized phantoms, which have independently calculated backscatter coefficients based on their physical properties. One phantom produces Rayleigh-like scattering, where the backscatter coefficient varies smoothly with frequency over the analysis bandwidth. A second phantom exhibits local maxima and minima in the scattering function versus frequency due to presence of millimeter sized graphite gel spheres in a gel background. The method was found to produce accurate results using time gate durations as small as 2 μs, although better accuracy is obtained for longer gate durations, particularly when the sample exhibits resonance peaks in backscatter versus frequency. Use of a Hamming window in place of a rectangular window extends the accuracy near the upper and lower limits of the frequency range.

Original languageEnglish (US)
Pages (from-to)603-607
Number of pages5
JournalIEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
Volume40
Issue number5
DOIs
StatePublished - Sep 1993

ASJC Scopus subject areas

  • Instrumentation
  • Acoustics and Ultrasonics
  • Electrical and Electronic Engineering

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