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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 1:27 |
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Conference: Bucharest University Faculty of Physics 2021 Meeting
Section: Optics, Spectroscopy, Plasma and Lasers
Title:
Increasing Accuracy of Laser Doppler Vibrometry Method for Multilayered Objects Conservation Status Control
Authors:
Iulian Alexandru Chelmus
*
Affiliation:
National Institute for Research and Development for Optoelectronics - INOE 2000
E-mail
alexandru.chelmus@inoe.ro
Keywords:
LDV, multilayer
Abstract:
The Laser Doppler Vibrometry (LDV) method has many advantages that makes it one of the most suitable methods for investigating hidden defects or structural problems. Its non-contact, non-invasive character makes it highly applicable in cultural heritage but it is successfully used in many other fields. Laser Doppler vibrometry works by emitting a continuous laser beam on the target surface and measuring the surface vibration using Doppler displacement between the incident beam and the reflected beam.
This paper presents laboratory measurements done on multilayered objects build with known in-depth defects. This study allows increasing accuracy of future in-situ data interpretation. Every object was investigated using four different excitation signals making possible this way, by comparison, to observe which one induced vibrations better in layers and also to identify the frequencies that marks accurately the known defects in data. Also a workflow protocol that aims to increase the accuracy of acquired data and minimizing or canceling human errors is presented.
In conclusion, a future possible solution is described, which will be tested in a subsequent study, to improve further more the accuracy of the method, respectively obtaining more precise identification of areas with structural problems in multilayer objects by correlating LDV data with thermal imaging or electric resistivity. Both been known and used to identify hidden defects or structural degradations.
Acknowledgement:
This study is financed by the Ministry of Research and Innovation
through “Program Nucleu” PN 19-18.01.01: OPTRONICA VI.
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