High sensitivity non-contact method for dynamic quantification of elastic waves & strains in transparent media

Rob Malkin, Daniel Robert

Research output: Contribution to journalArticle (Academic Journal)peer-review

6 Citations (Scopus)
283 Downloads (Pure)

Abstract

This paper presents time resolved quantitative evaluation of elastic stress waves in solid media by utilising an adaptation of the well-established laser Doppler vibrometry method. We show that the introduction of elastic stress waves in a transparent medium gives rise to detectable and quantifiable changes in the refractive index, which is proportional to stress. The method is tested for mechanical excitation at frequencies from 10 to 25kHz in an acrylic bar. This refractometric quantification can measure internal strains as low as 1x10-11. Additionally, finite element analysis is conducted to gauge the validity of the results. In the presented work an acrylic bar is used, this method however should be applicable to any transparent solid.
Original languageEnglish
Pages (from-to)51-57
Number of pages7
JournalMeasurment
Volume55
Early online date6 May 2014
DOIs
Publication statusPublished - Sep 2014

Keywords

  • Laser Doppler vibrometry
  • Refracto-vibrometry
  • Stress waves
  • Refractive index

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