Enhancement of acoustic imaging of polymers by cooling

Kazushi Yamanaka, Y. Nagata, T. Koda

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

A low temperature acoustic imaging technique is proposed to enhance the sensitivity of defect detection in materials with highly temperature dependent acoustic properties. An acoustic imaging device has been developed where the sample temperature is precisely controlled between 30 and -94°C using a methanol coupler. To illustrate both the feasibility and advantages of this method, a bonded structure using bisphenol ether type epoxy resin was observed; and defects and non-uniform structure not visible at ambient temperature became apparent in 25 MHz acoustic images when the sample was cooled to -30°C. From measurements of velocity and attenuation, this improvement was ascribed primarily to a decrease in the attenuation loss within the epoxy resin. The use of phased arrays and non-destructive evaluation of fibre-reinforced plastics are also discussed.

Original languageEnglish
Pages (from-to)159-165
Number of pages7
JournalUltrasonics
Volume29
Issue number2
DOIs
Publication statusPublished - 1991 Jan 1

Keywords

  • NDE
  • acoustic imaging
  • low temperature studies
  • polymers
  • sensitivity

ASJC Scopus subject areas

  • Acoustics and Ultrasonics

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