Optimized ultrasonic attenuation measures for non-homogeneous materials

Genovés, V.; Gosalbez, J.; Carrión, Alicia; Miralles, Ramón; Payá, J.

doi:10.1016/j.ultras.2015.09.007

Cited by 13 publications

(12 citation statements)

References 14 publications

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“…In this work, different sinusoidal tone burst signals (which produce narrowband excitation) varying in frequency [39,44,47,70,76] were launched in the tested plate and then every received spectrogram was combined into one [37] (hereafter, the combined spectrogram). The mathematical model of the transmitted sinusoidal tone burst signals is shown in Equation (9) [77]:xn(t)=A·sin(2πfnt)·rect(t−trueNc2fntrueNcfn), where A is the signal amplitude, fn is the driving frequency, Nc the number of cycles and rect(·) is the rectangular function.…”

Section: Mathematical Backgroundmentioning

confidence: 99%

Comparative Study of Coupling Techniques in Lamb Wave Testing of Metallic and Cementitious Plates

Vázquez

Gosalbez

Bosch

et al. 2019

Sensors

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Lamb waves have emerged as a valuable tool to examine long plate-like structures in a faster way compared to conventional bulk wave techniques, which make them attractive in non-destructive testing. However, they present a multimodal and dispersive nature, which hinders signal identification. Oblique incidence is one of the most known methods to generate and receive Lamb waves and it is applied in different experimental arrangements with different types of sensors. In this work, several setups were conducted and compared to determine the optimal ones to launch and detect ultrasonic Lamb waves, especially in non-homogeneous specimens. The chosen arrangements were contact with angle beam transducers, immersion in a water tank, localised water coupling using conical containers and air coupling. Plates of two different materials were used, stainless steel and Portland cement mortar. Theoretical and experimental dispersion curves were compared to verify the existence of Lamb modes and good correspondence was achieved.

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Section: Mathematical Backgroundmentioning

confidence: 99%

Comparative Study of Coupling Techniques in Lamb Wave Testing of Metallic and Cementitious Plates

Vázquez

Gosalbez

Bosch

et al. 2019

Sensors

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“…This analysis considers the frequency response of the equipment used in the experiment. For further details about the calibration process and the computation of the ESD of a chirp signal, see [16].…”

Section: Time and Frequency Dependent Parametersmentioning

confidence: 99%

“…The disadvantage of this kind of test is the fact that the mechanical properties of the GRC plates change quickly during the test, and it is difficult to inject various signals with different frequencies to cover a wide spectrum. To solve this problem, the authors have also recently published a study of the suitability of broadband signals, comparing different methods and signals to obtain a reliable method to acquire the information of a wide bandwidth with one single signal (chirp) [16]. This procedure permits monitoring a huge range of situations where the test-time has critical effects.…”

Section: Introductionmentioning

confidence: 99%

Ultrasonic broadband signals monitoring of glass-fiber reinforced cement (GRC) bending tests

Genovés

Gosalbez

Carrión

et al. 2017

Cement and Concrete Composites

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In this study, complete ultrasonic monitoring of Glass-fiber Reinforced Cement plates under bending tests was addressed. In this kind of experiment, the mechanical properties of the specimen continuously change during the test, thus, the acquisition time of the ultrasonic signals is a critical variable. In order to overcome this drawback, a new ultrasonic procedure based on broadband signals (chirp) has been applied. Following this line of thought, the analysed ultrasonic parameters have been split into the parameters that only depend on time, and those that depend on both time and frequency. In particular, the frequency dependent attenuation parameter allows characterizing the evolution of the plate being damaged over a wide frequency range and significantly detecting the main two events happening during the experiment: the first crack and the maximum stress point. In short, this paper demonstrates the suitability of ultrasonic broadband signals for characterizing fiber-reinforced cementitious composites under bending stress.

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“…The transmitted signals can be narrowband ( [8,[13][14][15]) or broadband ([6, 8, 16]). If the attenuation of the material and the sensitivity of measurement equipment allow the use of broadband signals, then the combination of this kind of measurement and suitable signal processing will result in an optimal estimate of α( f ) with a minimum of measurement time [17]. Although these studies have focused on contact measures, some work has been carried out using airborne non-contact ultrasound or air-coupled ultrasound [18,19].…”

Section: Introductionmentioning

confidence: 99%

Airborne non-contact and contact broadband ultrasounds for frequency attenuation profile estimation of cementitious materials

et al. 2018

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Optimized ultrasonic attenuation measures for non-homogeneous materials

Cited by 13 publications

References 14 publications

Comparative Study of Coupling Techniques in Lamb Wave Testing of Metallic and Cementitious Plates

Comparative Study of Coupling Techniques in Lamb Wave Testing of Metallic and Cementitious Plates

Ultrasonic broadband signals monitoring of glass-fiber reinforced cement (GRC) bending tests

Airborne non-contact and contact broadband ultrasounds for frequency attenuation profile estimation of cementitious materials

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