Assessment of coating layers on the accuracy of displacement measurement in laser Doppler vibrometry

Mostafa Hasanian, Cliff J. Lissenden

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

3 Scopus citations

Abstract

The Laser Doppler Vibrometer (LDV) is known to be a useful tool for measuring vibration and wave propagation for non-destructive testing (NDT). Although LDV systems have many advantages, most notably that they provide non-contact measurements, they often require surface enhancement such as reflective tape to improve the signal-to-noise ratio. While accurate for low frequencies, measured displacements from tape can be significantly different from the displacement of the substrate once the frequency exceeds a threshold value. In this study, different tapes are mounted on the surface of an aluminum block, and out-of-plane displacements are recorded for frequencies from 1 to 5 MHz. In addition, dynamic finite element modeling is conducted, where the effect of reflective tapes on measured displacements on the surface of the tape is evaluated. Results of the finite element simulations reveal that the effective stiffness and mass of the tape can contribute significantly to errors in data acquisition during experiments. As evident in the results, the discrepancy between the measured displacements at the top and the bottom of the tape is considerable at some frequencies. The wave propagation simulation also provides improved understanding of the experimental results.

Original languageEnglish (US)
Title of host publication43rd Annual Review of Progress in Quantitative Nondestructive Evaluation, Volume 36
EditorsLeonard J. Bond, Dale E. Chimenti
PublisherAmerican Institute of Physics Inc.
ISBN (Electronic)9780735414747
DOIs
StatePublished - Feb 16 2017
Event43rd Annual Review of Progress in Quantitative Nondestructive Evaluation, QNDE 2016 - Atlanta, United States
Duration: Jul 17 2016Jul 22 2016

Publication series

NameAIP Conference Proceedings
Volume1806
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Other

Other43rd Annual Review of Progress in Quantitative Nondestructive Evaluation, QNDE 2016
CountryUnited States
CityAtlanta
Period7/17/167/22/16

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Hasanian, M., & Lissenden, C. J. (2017). Assessment of coating layers on the accuracy of displacement measurement in laser Doppler vibrometry. In L. J. Bond, & D. E. Chimenti (Eds.), 43rd Annual Review of Progress in Quantitative Nondestructive Evaluation, Volume 36 [050006] (AIP Conference Proceedings; Vol. 1806). American Institute of Physics Inc.. https://doi.org/10.1063/1.4974600