Optical Evaluation of Vibrations in a Roof by the LPD Method

In this work, we present the results of the optical evaluation of resonance vibrations in a conventional roof.On this occasion, we took advantage of having an ordinary booth near the laboratory, making it easier for us to conduct this evaluation.The roof in question has a square geometry and is apparently made of concrete.Following our usual LPD (laser photo deflection) procedure, of exciting the vibrations of the structure through sound and detecting the response optically, we obtain by resonance the first 6 roof's Eigen oscillations, the same ones that are identified as Modes (1,1), (1,2), (2,2), (1,3), (2,3) and (3,3).The occurrence of these modes in this work is justified in a first approximation through the classical acoustic resonator theory.