Title :
Modal analysis of an aluminum rectangular plate by use of the balanced-detection DPP-BOTDA method
Author :
Minardo, Aldo ; Coscetta, Agnese ; Zeni, Luigi ; Bernini, Romeo
Author_Institution :
Dept. of Ind. & Inf. Eng., Second Univ. of Naples, Aversa, Italy
Abstract :
In this work we report an experimental modal analysis of an aluminum rectangular plate, carried out by use of the balanced-detection DPP-BOTDA method based on double-pulse pump waveform, combined with the Slope-Assisted BOTDA technique. Compared to standard DPP-BOTDA, the balanced-detection DPP-BOTDA method allows to retrieve the differential Brillouin gain in real time, i.e. without the need of post-processing differentiation, therefore allowing its combination with the Slope-Assisted BOTDA technique. The experimental mode shape of the first resonance of the aluminum plate is compared to numerical results based on a finite-element analysis (FEA), demonstrating that the proposed technique is well suited to perform the modal analysis of a vibrating structure.
Keywords :
aluminium; fibre optic sensors; finite element analysis; modal analysis; optical pumping; plates (structures); time-domain analysis; Al; Brillouin optical time-domain analysis; FEA; aluminum rectangular plate; balanced-detection DPP-BOTDA method; differential Brillouin gain; double-pulse pump waveform; experimental modal analysis; finite-element analysis; post-processing differentiation; slope-assisted BOTDA technique; vibrating structure; Delays; Monitoring; Optical pulses; Optical pumping; Optical scattering; Presses; Software; Brillouin scattering; distributed sensor; experimental modal analysis; fiber sensor;
Conference_Titel :
Photonics Technologies, 2014 Fotonica AEIT Italian Conference on
Conference_Location :
Naples
Print_ISBN :
978-8-8872-3718-4
DOI :
10.1109/Fotonica.2014.6843913
