Frescoes diagnostic using laser Doppler vibrometry and infrared thermography: experimental and numerical approaches

Alexia Agnani; Roberto M. De Andrade; Enrico Esposito; Mara Feligiotti; Sinthya G. Tavares

doi:10.1117/12.693082

21 June 2006 Frescoes diagnostic using laser Doppler vibrometry and infrared thermography: experimental and numerical approaches

Alexia Agnani, Roberto M. De Andrade, Enrico Esposito, Mara Feligiotti, Sinthya G. Tavares

Author Affiliations +

Proceedings Volume 6345, Seventh International Conference on Vibration Measurements by Laser Techniques: Advances and Applications; 63450R (2006) https://doi.org/10.1117/12.693082
Event: Seventh International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, 2006, Ancona, Italy

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.

Citation Download Citation

Alexia Agnani, Roberto M. De Andrade, Enrico Esposito, Mara Feligiotti, and Sinthya G. Tavares "Frescoes diagnostic using laser Doppler vibrometry and infrared thermography: experimental and numerical approaches", Proc. SPIE 6345, Seventh International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, 63450R (21 June 2006); https://doi.org/10.1117/12.693082

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