Attenuation coefficient estimation using experimental diffraction corrections with multiple interface reflections

Terence P. Lerch, Raina Cepel, Steven P. Neal

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

The ultrasonic attenuation coefficient of a fluid or solid is an acoustic parameter routinely estimated for the purpose of materials characterization and defect/disease detection. This paper describes a broadband attenuation coefficient estimation technique that combines two established estimation approaches. The key elements of these two approaches are: (1) the use of magnitude spectrum ratios of front surface, first back surface, and second back surface reflections from interfaces of materials with plate-like geometries, and (2) the use of an experimental diffraction correction approach to avoid diffraction losses. The combined estimation approach simplifies the attenuation coefficient estimation process by eliminating the need to explicitly make diffraction corrections or calculate reflection/transmission coefficients. The approach yields estimates of the attenuation coefficient, reflection coefficient, and material density. Models, experimental procedures, and signal analysis procedures, which support implementation of the approach, are presented. Attenuation coefficient and reflection coefficient estimates are presented for water and solid samples with estimates based on measurements made with multiple transducers.

Original languageEnglish
Pages (from-to)83-92
Number of pages10
JournalUltrasonics
Volume44
Issue number1
DOIs
StatePublished - Jan 2006

Keywords

  • Attenuation
  • Diffraction
  • Materials characterization
  • Nondestructive evaluation

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