Single-camera single-axis vision method applied to measure vibrations

Publication date: Available online 14 October 2019Source: Journal of Sound and VibrationAuthor(s): Thomas Durand-Texte, Manuel Melon, Elisabeth Simonetto, Stéphane Durand, Marie-Héléne MouletAbstractIncreased interest has been witnessed for full-field techniques measuring vibrations. 3D vision methods coupled to two high-speed cameras have proven to be a valid solution to measure 3D displacements, notably with the Stereo Digital Image Correlation (SDIC) tools. The now conventional pseudo-stereo system with a single high-speed camera and a four-mirror adapter, generating two virtual cameras, may also be used, even if it is rather complex to operate and remains limited to small objects. In a logic of simplification of the protocol, the authors present here a set-up requiring a single high-speed camera and no mirrors, with the associated full-field single-axis vision method. The latter is logically designed to measure the vibrations of items whose displacements are locally along a single axis (usually normal to the surface). This paper reports firstly the results of the full-field measurement of the vibrations of a plate, validated by a comparison with those obtained with the four-mirror adapter set-up, and secondly the application to the full-field measurement of the vibrations of a tambourine. Thirdly, the conventional pseudo-stereo technique and the proposed vision method are compared and assessed, in order to establish their respective limits and potential complementarity...

Source: Journal of Sound and Vibration - October 16, 2019 Category: Physics Source Type: research