Measurement of the longitudinal and transverse vibration frequencies of a rod by speckle interferometry.
A heterodyne interferometric system was used to detect the normal and tangential components of the displacement at one point of a sample when it is vibrating freely in its natural modes, arising from transient excitation. A cylindrical aluminium rod was the test sample. An analysis of the spectrum associated with the in-plane and out-of-plane displacements made it possible to determine the values of the longitudinal and transverse natural frequencies.
Bayon
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Dept. de Fisica Aplicada a los Recursos Naturales, Univ. Politecnica de Madrid.
Gascon
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Varade
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