MATEC Web Conf.
Volume 323, 202010th International Conference of Advanced Models and New Concepts in Concrete and Masonry Structures (AMCM 2020)
|Number of page(s)||10|
|Section||Adnanced Models and New Concepts in Concrete Structures|
|Published online||05 October 2020|
Laser vibrometer condition assessment of cemented materials using wavelet synchro-squeezed transform
Univeristy of Waterloo, Department of Civil and Environmental Engineering, Waterloo, Ontario, Canada
* Corresponding author: firstname.lastname@example.org
Current non-destructive ultrasonic techniques (NDT) are based mostly on wave velocity analysis. While current techniques can identify severe damage, they fail to detect early deterioration. Therefore, the proposed method, based on the propagation of surface waves, takes into account not only changes in wave velocity but also changes in wave attenuation. In practical/field applications, access to a structure is often limited to one side only (i.e. concrete slabs, vacuum building walls). Thus, surface wave analysis is a natural solution. To improve the reliability of wave attenuation measurements, responses of ultrasonic transducers are measured using a high-frequency Doppler laser vibrometer. Firstly, the ultrasonic transducer is characterized using the laser vibrometer. Then, based on the sensitive frequency ranges, response signals measured for the cemented sand specimen are analyzed, and the relative attenuation index based on spectral energy is proposed. The method is further improved using the wavelet synchro-squeezed transform.
© The Authors, published by EDP Sciences, 2020
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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