Highly-efficient and noncontact vibro-thermography via local defect resonance

Igor Solodov, Markus Rahammer, Daria Derusova, Gerd Busse

Research output: Contribution to journalArticlepeer-review

39 Citations (Scopus)

Abstract

A frequency match between the driving ultrasonic wave and characteristic frequency of a defect provides an efficient energy pumping from the wave directly into the defect (local defect resonance (LDR)). Due to a strong resonance amplification of the local vibrations, the LDR-driven defects exhibit a high-Q thermal response and enable to implement frequency-selective thermosonic imaging with an opportunity to distinguish between different defects by changing the driving frequency. The LDR-thermosonics requires much lower acoustic power to activate defects that makes it possible to avoid high-power ultrasonic instrumentation and even proceed to a remote ultrasonic thermography by using air-coupled ultrasonic excitation.

Original languageEnglish
Pages (from-to)98-111
Number of pages14
JournalQuantitative InfraRed Thermography Journal
Volume12
Issue number1
DOIs
Publication statusPublished - 2 Jan 2015

Keywords

  • infrared thermography
  • local defect resonance
  • non-destructive evaluation
  • vibrothermography

ASJC Scopus subject areas

  • Instrumentation
  • Electrical and Electronic Engineering

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