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Optical measurements from high-speed, high-definition video recordings canbe used to define the full-field dynamics of a structure. By comparing thedynamic responses resulting from both damaged and undamaged elements,structural health monitoring can be carried out, similarly as with mountedtransducers. Unlike the physical sensors, which provide point-wise measure-ments and a limited number of output channels, high-quality video recordingallows very spatially dense information. Moreover, video acquisition is a non-contact technique. This guarantees that any anomaly in the dynamic behav-iour can be more easily correlated to damage and not to added mass orstiffness due to the installed sensors.However, in real-life scenarios, the vibrations due to environmental input areoften so small that they are indistinguishable from measurement noise if con-ventional image-based techniques are applied. In order to improve the signal-to-noise ratio in low-amplitude measurements, phase-based motion magnifica-tion has been recently proposed.This study intends to show that model-based structural health monitoring canbe performed on modal data and time histories processed with phase-basedmotion magnification, whereas unamplified vibrations would be too small forbeing successfully exploited. All the experiments were performed on amultidamaged box beam with different damage sizes and angles.

An experimental study of the feasibility of phase-based video magnification for damage detection and localisation in operational deflection shapes / Civera, M.; Zanotti Fragonara, L.; Surace, C.. - In: STRAIN. - ISSN 0039-2103. - (2020), p. e12336. [10.1111/str.12336]

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