Scientific Papers


Modal analysis of a cantilever beam by use of Brillouin based distributed dynamic strain measurements

Authors (PARTNER)

A. Minardo, A. Coscetta, S. Pirozzi, R. Bernini, L. Zeni (SUN)

Name and/or number of magazine/newspaper/journal…

Smart Materials and Structures, vol. 21, issue 12, pp. 125022-125022, Nov 2012.

ISSN: 0964-1726

DOI: 10.1088/0964-1726/21/12/125022


In this work we report an experimental modal analysis of a cantilever beam, carried out by use of a Brillouin optical time-domain analysis (BOTDA) setup operated at a fixed pump–probe frequency shift. The employed technique permitted us to carry out distributed strain measurements along the vibrating beam at a maximum acquisition rate of 108 Hz. The mode shapes of the first three bending modes (1.7, 10.8, 21.6 Hz) were measured for the structure under test. The good agreement between the experimental and numerical results based on a finite-element method (FEM) analysis demonstrates that Brillouin based distributed sensors are well suited to perform the modal analysis of a vibrating structure. This type of analysis may be useful for applications in structural health monitoring where changes in mode shapes are used as indicators of the damage to the structure.


This website has been produced with funding received from the European Community’s Seventh Framework Programme under Grant Agreement nº SCP0–GA-2010–265954.

This website is the property of the ACEM-Rail consortium and shall not be distributed or reproduced without the formal approval of the ACEM-Rail Project Management Committee.