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Proceedings Paper

Frescoes diagnostic using laser Doppler vibrometry and infrared thermography: experimental and numerical approaches
Author(s): Alexia Agnani; Roberto M. De Andrade; Enrico Esposito; Mara Feligiotti; Sinthya G. Tavares
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Paper Abstract

In this work laser Doppler vibrometry has been used for damage detection in frescoes. Results were compared with the ones obtained through infrared thermography, and, for both techniques, mathematical models were implemented to simulate the physical domains and conditions of the employed test sample. The limitations of each methodology are also discussed. The numerical model of the vibrometric investigations has been constructed using Finite Elements Method modeling. A new procedure based on the observation of Rayleigh waves propagation velocities allowed to acquire sample mechanical parameters. Comparison of experimental and simulated data and independent defect diameter measurement by echographic equipment, allowed to establish the confidence level and the discrepancies in the developed model. Also operational limits of the vibrometric technique have been studied by acquisition of Signal-to-Noise ratio on different areas of a sample. The Fourier equation has been used for the mathematical model employed for the numerical simulation of the thermographic investigations. Numerical technique with formularization in finite volumes has been employed and a FORTRAN code has been developed to solve the thermal problem.

Paper Details

Date Published: 21 June 2006
PDF: 11 pages
Proc. SPIE 6345, Seventh International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, 63450R (21 June 2006); doi: 10.1117/12.693082
Show Author Affiliations
Alexia Agnani, Univ. Politecnica delle Marche (Italy)
Roberto M. De Andrade, Univ. Federal de Minas Gerais (Brazil)
Enrico Esposito, Univ. Politecnica delle Marche (Italy)
Mara Feligiotti, Univ. Politecnica delle Marche (Italy)
Sinthya G. Tavares, Univ. Politecnica delle Marche (Italy)
Univ. Federal de Minas Gerais (Brazil)

Published in SPIE Proceedings Vol. 6345:
Seventh International Conference on Vibration Measurements by Laser Techniques: Advances and Applications
Enrico Primo Tomasini, Editor(s)

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