Theoretical modeling and experimental evaluation of an in-plane laserDoppler vibrometer in different working conditions,

摘要

Abstract: The use of laser Doppler velocimeters in the analysis of in- plane motion of a solid body is spreading both in the scientific research and in the industrial experimentation fields. The applicability and accuracy of the technique depend on the conditions in which the system operates: the level of the signal available, the characteristics of the surface observed, the environmental conditions, the presence of other shifts in addition to the ones pointed out, etc. This is the subject of this analysis is carried out through a comparison between an axial vibrometer in condition of ideal operation and a tangential vibrometer operating on various surface states. The survey carried out experimentally has been supported by a theoretic modeling of the interaction between this measuring system and the measurand, so to provide a rational description of the phenomena observed. This study has made it possible to verify the effects of the various operative conditions and the change of extending the use of the system also to cases in which the applications of the technique proves to be difficult. !13