Results 21 to 30 of about 18,925 (253)
Experimental study on lateral displacement measurement using air-coupled ultrasound transducers
Mechanical Engineering Journal, 2014 We propose a novel measurement method for directly measuring the lateral displacement of structures by using air-coupled ultrasound transducers. The normally-distributed far field of an ultrasound transducer in a lateral direction is taken advantage of ...
Iwao MATSUYA +2 more
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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. +4 more
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Air-Coupled Piezoelectric Transducers with Active Polypropylene Foam Matching Layers
Sensors, 2013 This work presents the design, construction and characterization of air-coupled piezoelectric transducers using 1–3 connectivity piezocomposite disks with a stack of matching layers being the outer one an active quarter wavelength layer made of ...
Tomás E. Gómez Alvarez-Arenas
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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
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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 +4 more
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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 +4 more
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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 +1 more
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Shipin gongye ke-jiObjective: 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 +6 more
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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 +3 more
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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 +5 more
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