A New Ultrasonic Amplitude Tomography Approach, with Validation on Masonry Tuff Blocks

Camassa, Domenico; Castellano, Anna; Fraddosio, Aguinaldo; Piccioni, Mario Daniele

doi:10.1007/s10921-020-00693-2

Cited by 16 publications

(4 citation statements)

References 39 publications

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“…Due to the high vulnerability to damage, masonry constructions must be preserved and safeguarded over time. Appropriate conservation and restoration interventions require suitable investigation procedures (Binda et al, 2000), which mainly involves non-destructive techniques (Carpinteri et al, 2007;Ramos et al, 2010a;Castellano et al, 2015;Castellano et al, 2016;Camassa et al, 2019;Camassa et al, 2020;Pallarés et al, 2021). Among them, modal testing has the very appealing feature of monitoring the global response of a structure.…”

Section: Introductionmentioning

confidence: 99%

Modal testing of masonry constructions by ground-based radar interferometry for structural health monitoring: A mini review

Camassa

Vaiana

Castellano

2023

Front. Built Environ.

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Modal testing is one of the most effective experimental techniques for the structural health monitoring of masonry constructions, as it provides useful information for the calibration of structural models and for the assessment of structural damage. However, the application of modal testing to masonry constructions is sometimes hindered by the complexity of the conventional experimental set-up, which is generally based on contact sensors. In order to overcome this issue, several researchers are exploring the application of the ground-based radar interferometry, which is an increasingly popular measurement technique for remotely monitoring displacement and vibration of structures. Given the recently increasing number of articles on this subject, here we propose a mini review on the most significant works dealing with the application of ground-based radar interferometry for modal testing of masonry constructions. In particular, we show the current state of the art and highlight the main research gaps with the purpose of assessing the effectiveness of ground-based radar interferometry for the structural health monitoring of these constructions. Our mini review is primarily aimed at engineers and scientists who already know about modal testing and radar interferometry technique and are interested in the specific application to masonry constructions.

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Section: Introductionmentioning

confidence: 99%

Modal testing of masonry constructions by ground-based radar interferometry for structural health monitoring: A mini review

Camassa

Vaiana

Castellano

2023

Front. Built Environ.

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“…Furthermore, a study from 2014 [ 25 ] was performed on isotropic polyvinyl chloride (PVC) polymer to identify volumetric voids and planar inclusions, showing promising results using air-coupled tomography. There were studies on ultrasonic tomography using contact transducers [ 26 , 27 , 28 , 29 ] which showed promising results with faster solutions; however, the biggest downside is that, for these contact techniques, the transducers are fixed at a permanent position, which offers a structural health monitoring solution, but is not suitable for in situ inspections. Another recent study was performed [ 30 ] using laser excitation; the air-coupled approach was used for isotropic materials and various tomographic reconstruction algorithms were discussed.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Ultrasonic Non-Contact Air-Coupled Techniques for Characterization of Impact-Type Defects in Pultruded GFRP Composites

et al. 2021

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This article compares different air-coupled ultrasonic testing methods to characterize impact-type defects in a pultruded quasi-isotropic glass fiber-reinforced plastic (GFRP) composite plate. Using the air-coupled transducers, comparisons among three methods were performed, namely, bulk-wave through transmission, single-side access using guided waves, and ultrasonic-guided wave tomography. The air coupled through transmission technique can determine the size and shape of impact-type defects with a higher resolution, but with the consequence of time consumption and, more importantly, the necessity of access to both sides of the sample. The guided wave technique on the other hand, allows a single-side inspection and is relatively fast. It can be used to determine the size of the defect using ultrasonic B-scan, but the exact shape of the defect will be compromised. Thus, in this article, to determine the shape of the defect, application of the parallel beam tomographic reconstruction technique using guided Lamb waves is demonstrated. Furthermore, a numerical finite element simulation was performed to study the effects of guided wave propagation in the composite sample and interaction with the internal defect. Lastly, the results from the experiments of different techniques were compared according to possibilities of defect sizing and determination of its shape.

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“…Ultrasonic tomography technique is a popular non-destructive evaluation method to illustrate the inside of concrete structures. One of the ultrasonic tomography techniques is the through-transmission method that measures the time-of-flight or signal attenuation coefficient to depict the internal profile of concrete structures [4][5][6][7][8]. This method, however, requires to access the opposite surface, which is usually impossible for concrete structure.…”

Section: Introductionmentioning

confidence: 99%

Pulse Peak Delay-Total Focusing Method for Ultrasonic Tomography on Concrete Structure

2021

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An ultrasonic array device like the A1040 MIRA is used to non-destructively visualize the inside of concrete structures. A data set acquired by the ultrasonic array device is so unfocused that an image reconstruction algorithm is required to transform the data set into an understandable image. The image reconstruction algorithm like total focusing method exploits the time-of-flight of an ultrasonic pulse when focusing the image. While a high frequency ultrasonic pulse barely affects the accuracy of results, a low frequency ultrasonic pulse with a long wavelength causes an overall sagging of the resulting image around half wavelength of the pulse, which results in a poor quality of results. In this research, a modified total focusing method called pulse peak delay-total focusing method is proposed to calibrate the sagging in the resulting images due to the long wavelength of the pulse. The simulation of an ultrasonic array signal is implemented to validate the proposed method. The experimental results are compared with the simulation results to validate the proposed method. The simulation using the proposed method shows good agreement with experimental results. Analysis of results using potential damage curve and array performance indicator shows that the proposed method allows the higher accuracy, as well as the increased resolution of resulting images.

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A New Ultrasonic Amplitude Tomography Approach, with Validation on Masonry Tuff Blocks

Cited by 16 publications

References 39 publications

Modal testing of masonry constructions by ground-based radar interferometry for structural health monitoring: A mini review

Modal testing of masonry constructions by ground-based radar interferometry for structural health monitoring: A mini review

Comparison of Ultrasonic Non-Contact Air-Coupled Techniques for Characterization of Impact-Type Defects in Pultruded GFRP Composites

Pulse Peak Delay-Total Focusing Method for Ultrasonic Tomography on Concrete Structure

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