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Application of the LPD (Laser Photo Deflection) Method to the Vibrational Diagnosis of a Steel Bar
Aníbal Valera
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DOI:10.17265/1934-7359/2025.04.002
Facultad de Ciencias, Universidad Nacional de Ingeniería, Av. Tupac Amaru, Lima 15333, Perú
This article presents the optical evaluation of the vibrational behavior of a steel bar, by a non-conventional optoacoustic procedure, the LPD (laser photo deflection) method. On this occasion the bar is located horizontal and fixed at both ends. Through our procedure we experimentally find the first 9 Eigen frequencies (21 Hz, 60 Hz, 116 Hz...) and correlate them using the cantilever theory.
Structural vibrations, resonance, sound excitation, optical measurements, LPD.
Journal of Civil Engineering and Architecture 19 (2025) 167-172
doi: 10.17265/1934-7359/2025.04.002
[1] Timoshenko, S. 1955. Vibrations in Engineering (2nd ed.). New York: Van Nostrand.
[2] Valera, A., Melchor, M., and Tafur, V. 2023. “Optical Evaluation of Vibrations in a Concrete Column by the LPD Method.” Journal of Civil Engineering and Architecture 17: 616-20. doi: 10.17265/1934-7359/2023.12.002.
[3] Valera, A., Castillo, G., and Mejía, K. 2024. “Optical Evaluation of Vibrations in a Roof by the LPD Method.” Journal of Civil Engineering and Architecture 18: 540-4. doi: 10.17265/1934-7359/2024.11.004.
[4] ASM Handbooks. 1990. Properties and Selection: Irons, Steels, and High-Performance Alloys (Vol. 1). Novelty: ASM International. https://doi.org/10.31399/asm.hb.v01.9781627081610.