Abstract

In this paper, we present the results of the optical evaluation of the vibrational behavior of a wall (brick). The procedure used is Laser Photo Deflection (LPD), where a laser beam reflected off the sample is redirected to a deflection detector, which detects the sample's vibrations. Using various excitation alternatives, it is possible to establish definitely the first 10 Eigen vibration modes, from which a simple formation pattern based on 2 digits (n,m) can be clearly recognized, for example mode (1,1) (the fundamental mode) corresponds to 29.4 Hz and mode (2,1) to 37.3 Hz, and so on.

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

References

1. 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.
2. Valera A and Eyzaguirre C. “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.
3. A Valera and A Ortiz. “Vibration evaluation in structures using a non-conventional optical method”. Tecnia UNI, Lima-Peru 17.2 (2007): 47-54.
4. A Valera, E Romero and J Florindez. “Detection of building vibrations applying Laser Photo Deflection response”. Tecnia, UNI, Lima-Peru 18.1 (2008): 21-28.
5. Russell H. “Introduction to Partial Differential Equations”. http://people.uncw.edu/hermanr/pde1/pdebook

Citation

Anibal Valera., et al. “Application of the LPD (Laser Photo Deflection) Method to the Vibrational Diagnosis of a Brick Wall". Clareus Scientific Science and Engineering 2.7 (2025): 04-15.

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.