Results 21 to 30 of about 20,357 (252)

CFRP pipe inspection by means of air-coupled ultrasound [PDF]

AIP Conference Proceedings, 2019
Due to their high strength and stiffness at comparatively low weight, lightweight construction materials such as fiber reinforced plastics (FRP) are used in a variety of technical systems. The areas of application range from aerospace and renewable energies to the automotive sector, which is gaining increasing importance.
Sebastian Joas, Wolfgang Essig, Florian Fröhlich, Marc Kreutzbruck   +3 more
openaire   +1 more source

Application of Micro-Electro-Mechanical Sensors Contactless NDT of Concrete Structures

Sensors, 2015
The utility of micro-electro-mechanical sensors (MEMS) for application in air-coupled (contactless or noncontact) sensing to concrete nondestructive testing (NDT) is studied in this paper.
Suyun Ham, John S. Popovics
doaj   +1 more source

An Integrated Front-end Circuit Board for Air-Coupled CMUT Burst-Echo Imaging

Sensors, 2020
To conduct burst-echo imaging with air-coupled capacitive micromachined ultrasonic transducers (CMUTs) using the same elements in transmission and reception, this work proposes a dedicated and integrated front-end circuit board design to build an imaging
Lei Ye, Jian Li, Hui Zhang, Dongmei Liang, Zhuochen Wang   +4 more
doaj   +1 more source

Nondestructive Testing of the Integrity of Solid Oxide Fuel Cell Stack Elements by Ultrasound and Thermographic Techniques

Energies, 2022
Single planar fuel cell elements consisting of metallic interconnectors that are bonded and sealed by a thin glass solder layer form the core of a solid oxide fuel cell.
Udo Netzelmann, Andrea Mross, Thomas Waschkies, Dietmar Weber, Ewald Toma, Holger Neurohr   +5 more
doaj   +1 more source

Deep-Subwavelength-Optimized Holey-Structured Metamaterial Lens for Nonlinear Air-Coupled Ultrasonic Imaging

Sensors, 2021
Ultrasound non-destructive testing (NDT) is a common technique used for defect detection in different materials, from aluminium to carbon-fiber-reinforced polymers (CFRPs).
Marco Boccaccio, Pasquale Rachiglia, Gian Piero Malfense Fierro, Giovanni Pio Pucillo, Michele Meo   +4 more
doaj   +1 more source

Air-coupled ultrasound inspection of glued laminated timber [PDF]

Holzforschung, 2011
Abstract A novel air-coupled ultrasound (ACU) 120 kHz normal transmission system enabled successful imaging of bonding and saw cut defects in multilayered glulam beams up to 280 mm in height with a signal-to-noise ratio (SNR) of 40 dB. The main wave propagation paths were modeled; quasi-longitudinal and quasi-transverse modes were coupled ...
Sanabria, Sergio J., Furrer, Roman, Neuenschwander, Juerg, Niemz, Peter, Sennhauser, Urs   +4 more
openaire   +3 more sources

Mass Transfer Study on Drying of Curdlan by Hot Air Coupled with Ultrasound and Infrared Irradiation and Quality Analysis

Shipin gongye ke-ji
Objective: Hot air coupled with ultrasound and infrared irradiation were used for the drying of curdlan. The drying mechanism and quality change of curdlan were explored under the multi-physical fields, so as to developing the green drying technology of ...
Hongqian WANG, Qinyu DAI, Rui ZHU, Chong ZHANG, Yongbin HAN, Dandan LI, Yang TAO   +6 more
doaj   +1 more source

Air-Coupled and Resonant Pulse-Echo Ultrasonic Technique

Sensors, 2019
An ultrasonic, resonant, pulse-echo, and air-coupled nondestructive testing (NDT) technique is presented. It is intended for components, with regular geometries where it is possible to excite resonant modes, made of materials that have a high acoustic ...
Tomás Gómez Álvarez-Arenas, Jorge Camacho   +1 more
doaj   +1 more source

A Study of a Parametric Method for the Snow Reflection Coefficient Estimation Using Air-Coupled Ultrasonic Waves

Sensors, 2020
In this paper, a method for estimating snow pressure reflection coefficient based on non-contact ultrasound examination is described. A constant frequency and air-coupled ultrasound pulses were used in this study, which incorporates a parametric method ...
Krzysztof Herman, Tadeusz Gudra, Krzysztof Opieliński, Dariusz Banasiak, Tomasz Budzik, Nathalie Risso   +5 more
doaj   +1 more source

CIVA Modelling as an Effective Tool for Air-coupled Through-Transmission Ultrasonic Inspection

e-Journal of Nondestructive Testing
Air-coupled ultrasound has been used as a tool for surface profilometry and to inspect highly attenuative materials such as composite laminates and foams for voids or disbonded areas.
Edward Ginzel
doaj   +1 more source