Measurement of absolute acoustic strain by non-contact technique

Subash Jayaraman, Michael Pedrick, Bernhard R. Tittmann

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Some ultrasonic applications require non-contact techniques because the target material is not easily accessible. In such cases laser-based and air-coupled ultrasonic techniques play a major role but commonly significant transmission loss is known to occur especially at higher frequencies. Therefore, it becomes imperative to know the amount of absolute acoustic strain achieved for a given application. In this paper, we report on the use of laser-based techniques to measure absolute strain on the face of vibrating rods excited under various scenarios. These include contact and air-coupled excitation at frequencies at resonance, as well as a factor of 100 below and above the resonance. The limit of our out-of-plane displacement measurement appears to be about 5 nanometers. Strains as high as 10-6 have been obtained. The paper will describe the details of the ultrasonic techniques and some of the applications. The data are compared to theoretical and simulated strain calculations.

Original languageEnglish (US)
Title of host publicationReview of Progress in Quantitative Nondestructive Evaluation
Subtitle of host publicationVolume 25B
Number of pages7
StatePublished - Mar 6 2006
EventReview of Progress in Quantitative Nondestructive - Brunswick, ME, United States
Duration: Jul 31 2005Aug 5 2005

Publication series

NameAIP Conference Proceedings
Volume820 II
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616


OtherReview of Progress in Quantitative Nondestructive
Country/TerritoryUnited States
CityBrunswick, ME

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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