Ultrasonic lamb wave NDE system using an air coupled concave array transducer

García‐Hernández, Miguel J.; Chávez, J.A.; Yañez, Y.; Kichou, H.B.; Prego-Borges, Jose' L.; Soler, Jordi; Turó, A.; Espinosa, F. Montero de

doi:10.1109/ultsym.2004.1418024

Cited by 10 publications

(9 citation statements)

References 9 publications

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“…Different means, such as electromagnetic acoustic transducers (EMATs), wedge transducers, laser sensors, air-coupled transducers, and PZT wafers, have been utilized to generate and acquire Lamb waves (Ann et al, 2004; Dupont et al, 2000; Garcia-Hernanadez et al, 2004; Murayama and Mizutani, 2002; Rose, 1998; Wilcox et al, 2005; Yu and Giurgiutiu, 2009). In our work, we use a hybrid actuation-sensing system, which combines the piezoelectric actuation and the laser vibrometry sensing.…”

Section: Lamb Wave Propagation Study Setupmentioning

confidence: 99%

Lamb wave frequency–wavenumber analysis and decomposition

Tian

2014

Journal of Intelligent Material Systems and Structures

115

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Lamb waves have shown great potentials in damage detection of thin-walled structures due to their long propagation capability and sensitivity to a variety of damage types. However, their practical adoption has been hindered due to the complexity caused by their multimodal nature. Various wave modes that propagate at various velocities in the structure make the interpretation of Lamb wave signals very difficult. It is desired that the modes can be separated for independent analysis or further employment. In this article, we present our studies on the multimodal Lamb wave propagation and wave mode decomposition using frequency–wavenumber analysis. Wave representation in the frequency–wavenumber domain is obtained using multidimensional Fourier transform, where various Lamb wave modes can be easily discerned. This allows for separating them or extracting a desired wave mode through a filtering process, thus making it possible to use a single-mode Lamb wave for the detection of a certain type of damage in structural health monitoring applications. To retain the temporal and spatial information that is lost during Fourier transformation, a novel wavenumber analysis is also presented. These concepts are illustrated through experimental testing where high spatial resolution wavefields are measured by a scanning laser Doppler vibrometer.

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Section: Lamb Wave Propagation Study Setupmentioning

confidence: 99%

Lamb wave frequency–wavenumber analysis and decomposition

Tian

2014

Journal of Intelligent Material Systems and Structures

115

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“…Pureka et al [15] described a damage detection technique on isotropic plates based on the properties of a linear phased array with piezoelectric sensors and low frequency Lamb wave dynamics. Garcia-Hernandez et al [16] developed an ultrasonic Lamb wave NDE system using an air coupled concave linear array working on pitch-catch configuration for sheet and plate materials such as resin-fiber composites. The beam was electronically steered to measure the optimum input angle of the incident wave impinging the materials surface.…”

Section: Ultrasonic Guided Waves Phased Arraysmentioning

confidence: 99%

In situ 2-D piezoelectric wafer active sensors arrays for guided wave damage detection

2008

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“…14 However, the need of an acoustic matching medium (typically water or ultrasound gel) between the ablated tissue and the feedback detector may still hamper the applicability of this approach in a real clinical setting. It has been previously shown that the non-contact detection of pressure (ultrasound) waves from remote locations is possible by means of air-coupled transducers, 15 which are specifically designed to reduce the enormous acoustic mismatch between air and ultrasound sensing elements. Efficient coupling to the air medium can be performed with micro-membrane capacitance transducers 16 or with piezoelectric sensors coupled with microporous layers, with the latest approach more convenient for frequencies above 1 MHz.…”

Section: Introductionmentioning

confidence: 99%

Non-contact monitoring during laser surgery by measuring the incision depth with air-coupled transducers

Landa

Deán‐Ben

Espinosa

et al. 2017

Photons Plus Ultrasound: Imaging and Sensing 2017

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Lack of haptic feedback during laser surgery hampers controlling the incision depth, leading to a high risk of undesired tissue damage. Here we present a new feedback sensing method that accomplishes non-contact realtime monitoring of laser ablation procedures by detecting shock waves emanating from the ablation spot with air-coupled transducers. Experiments in soft and hard tissue samples attained high reproducibility in real-time depth estimation of the laser-induced cuts. The advantages derived from the non-contact nature of the suggested monitoring approach are expected to greatly promote the general applicability of laser-based surgeries.

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Ultrasonic lamb wave NDE system using an air coupled concave array transducer

Cited by 10 publications

References 9 publications

Lamb wave frequency–wavenumber analysis and decomposition

Lamb wave frequency–wavenumber analysis and decomposition

In situ 2-D piezoelectric wafer active sensors arrays for guided wave damage detection

Non-contact monitoring during laser surgery by measuring the incision depth with air-coupled transducers

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