Abstract

This work presents the optical evaluation of the vibrational behavior of a concrete beam using an unconventional optoacoustic procedure, the LPD method. In this case, the beam is an integral part of our laboratory construction in Lima; it supports part of the laboratory roof. Using our procedure, we experimentally determined the first 10 Eigen frequencies (14.4 Hz, 40 Hz, 78 Hz, etc.) of the beam, which we can explain using simple cantilever theory.

Keywords: Physics; Engineering (Structural vibrations; Resonance; Eigen frequencies; Sound excitation; Optical measurements; Laser photo deflection)

References

1. Bell A. “On the Production and Reproduction of Speech by Light”. American Journal of Science 20.118 (1880): 305-324.
2. Lopez R. “Evaluation and measurement of building vibrations using the Laser Photo Deflection technique”. Tesis de Licenciatura, UNI /FC Lima-Peru (2011).
3. Meirovitch L. “Analytical Methods in vibrations”. Prentice Hall PTR (1967).
4. Valera A, Castillo G and Mejia K. “Optical Evaluation of Vibrations in a Roof by the LPD Method”. Journal of Civil Engineering and Architecture 18 (2024): 540-544.
5. Engineering ToolBox. 2001. [online] (2025). https://www.engineeringtoolbox.com

Citation

Anibal Valera., et al. “Application of the LPD (Laser Photo Deflection) Method to the Vibrational Diagnosis of a Concrete Beam". Clareus Scientific Science and Engineering 2.5 (2025): 20-30.

Copyright

© 2025 Anibal Valera., et al. Licensee Clareus Scientific Publications. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license.