A noncontact method for determining surface density of nonporous materials with the limp-wall mass law

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Abstract

Abstract A new noncontact technique for determining the surface density or mass per unit area of nonporous, homogeneous membranes and foils of sub-wavelength thicknesses is introduced. Surface densities are determined through application of the limp-wall mass law and through-transmission ultrasonic measurements of bulk waves. The ultrasonic measurements are performed with commercially-available, broadband air-coupled ultrasonic transducers. Surface densities of aluminum foil, brass shim, and plastic sheets are typically found to be within 3% of their accepted values.

Original languageEnglish
Article number5632
Pages (from-to)39-46
Number of pages8
JournalApplied Acoustics
Volume101
DOIs
StatePublished - Jan 1 2016

Keywords

  • Air-coupled ultrasound
  • Limp-wall mass law
  • Mass per unit area
  • Material characterization
  • Surface density
  • Through-transmission

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