Remote monitoring of building oscillation modes by means of real-time Mid Infrared Digital Holography

Year: 2016

Authors: Poggi P., Locatelli M., Pugliese E., Delle Donne D., Lacanna G., Meucci R., Ripepe M.

Autors Affiliation: Ist Nazl Ott CNR, Florence, Italy; Univ Florence, Dipartimento Sci Terra, I-50121 Florence, Italy; Univ Palermo, Dipartimento Sci Terra & Mare, Palermo, Italy.

Abstract: Non-destructive measurements of deformations are a quite common application of holography but due to the intrinsic limits in the interferometric technique, those are generally confined only to small targets and in controlled environment. Here we present an advanced technique, based on Mid Infrared Digital Holography (MIR DH), which works in outdoor conditions and provides remote and real-time information on the oscillation modes of large engineering structures. Thanks to the long wavelength of the laser radiation, large areas of buildings can be simultaneously mapped with sub-micrometric resolution in terms of their amplitude and frequency oscillation modes providing all the modal parameters vital for all the correct prevention strategies when the functionality and the health status of the structures have to be evaluated. The existing experimental techniques used to evaluate the fundamental modes of a structure are based either on seismometric sensors or on Ground-based Synthetic Aperture Radar (GbSAR). Such devices have both serious drawbacks, which prevent their application at a large scale or in the short term. We here demonstrate that the MIR DH based technique can fully overcome these limitations and has the potential to represent a breakthrough advance in the field of dynamic characterization of large structures.

Journal/Review: SCIENTIFIC REPORTS

Volume: 6      Pages from: 23688  to: 23688

KeyWords: 10.6 MU-M; Interferometry; Identification; Vibration; Holography; Computer generated holography
DOI: 10.1038/srep23688

Citations: 20
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