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Mas D, Espinosa J, Roig AB, et al. Measurement of wide frequency range structural microvibrations with a pocket digital camera and sub-pixel techniques. Appl Opt. 2012;51(14):2664-71doi: 10.1364/AO.51.002664.
Mas, D., Espinosa, J., Roig, A. B., Ferrer, B., Perez, J., & Illueca, C. (2012). Measurement of wide frequency range structural microvibrations with a pocket digital camera and sub-pixel techniques. Applied optics, 51(14), 2664-71. https://doi.org/10.1364/AO.51.002664
Mas, David, et al. "Measurement of wide frequency range structural microvibrations with a pocket digital camera and sub-pixel techniques." Applied optics vol. 51,14 (2012): 2664-71. doi: https://doi.org/10.1364/AO.51.002664
Mas D, Espinosa J, Roig AB, Ferrer B, Perez J, Illueca C. Measurement of wide frequency range structural microvibrations with a pocket digital camera and sub-pixel techniques. Appl Opt. 2012 May 10;51(14):2664-71. doi: 10.1364/AO.51.002664. PMID: 22614487.
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Appl Opt. 2012 May 10;51(14):2664-71. doi: 10.1364/AO.51.002664.

Measurement of wide frequency range structural microvibrations with a pocket digital camera and sub-pixel techniques.

Applied optics

David Mas, Julian Espinosa, Ana B Roig, Belen Ferrer, Jorge Perez, Carlos Illueca

Affiliations

  1. Institut Física Aplicada a las Ciencias y Tecnologías, University of Alicante, Alicante, Spain. [email protected]

PMID: 22614487 DOI: 10.1364/AO.51.002664

Abstract

Analysis of vibrations and displacements is a hot topic in structural engineering. Although there is a wide variety of methods for vibration analysis, direct measurement of displacements in the mid and high frequency range is not well solved and accurate devices tend to be very expensive. Low-cost systems can be achieved by applying adequate image processing algorithms. In this paper, we propose the use of a commercial pocket digital camera, which is able to register more than 420 frames per second (fps) at low resolution, for accurate measuring of small vibrations and displacements. The method is based on tracking elliptical targets with sub-pixel accuracy. Our proposal is demonstrated at a 10 m distance with a spatial resolution of 0.15 mm. A practical application over a simple structure is given, and the main parameters of an attenuated movement of a steel column after an impulsive impact are determined with a spatial accuracy of 4 µm.

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