Air-Coupled and Resonant Pulse-Echo Ultrasonic Technique [PDF]
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
doaj +4 more sources
Deep-Subwavelength-Optimized Holey-Structured Metamaterial Lens for Nonlinear Air-Coupled Ultrasonic Imaging [PDF]
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
doaj +2 more sources
High-Sensitivity Air-Coupled Ultrasonic Transducer Design Based on PMN-PT Bending Vibration Modes [PDF]
SensorsGas pipelines are a critical means of transportation in industrial production. To detect gas pipeline leaks, ultrasonic transducers with specific center frequencies and high sensitivity are required.
Junwen Deng +5 more
doaj +2 more sources
Air-Coupled Reception of a Slow Ultrasonic A0 Mode Wave Propagating in Thin Plastic Film [PDF]
Sensors, 2020 At low frequencies, in thin plates the phase velocity of the guided A0 mode can become slower than that of the ultrasound velocity in air. Such waves do not excite leaky waves in the surrounding air, and therefore, it is impossible to excite and receive ...
Rymantas J. Kazys +1 more
doaj +2 more sources
Non-Contact Shear Wave Generation and Detection Using High Frequency Air-Coupled Focused Transducer and Fiber Optic Based Sagnac Interferometer for Mechanical Characterization [PDF]
Sensors, 2022 In shear wave-based material mechanical characterization, the transmit/receiver transducer is generally in contact with the material through a coupling medium.
Gui Chen, Jinjun Xia
doaj +2 more sources
An Integrated Front-end Circuit Board for Air-Coupled CMUT Burst-Echo Imaging [PDF]
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
doaj +2 more sources
Application of Air-Coupled Ultrasonic Arrays for Excitation of a Slow Antisymmetric Lamb Wave [PDF]
Sensors, 2018 Air-coupled excitation and reception of ultrasonic guided waves is already used for non-destructive testing and evaluation (NDT & E). Usually for air-coupled NDT & E purposes the lowest zero-order antisymmetric Lamb wave mode A0 is used, because ...
Rymantas J. Kazys +2 more
doaj +2 more sources
Air-coupled ultrasound detection using capillary-based optical ring resonators [PDF]
Scientific Reports, 2017 We experimentally demonstrate and theoretically analyze high Q-factor (~107) capillary-based optical ring resonators for non-contact detection of air-coupled ultrasound. Noise equivalent pressures in air as low as 215 mPa/√Hz and 41 mPa/√Hz at 50 kHz and
Kyu Hyun Kim +6 more
doaj +2 more sources
Numerical Simulation and Experimental Study of Fluid-Solid Coupling-Based Air-Coupled Ultrasonic Detection of Stomata Defect of Lithium-Ion Battery [PDF]
Sensors, 2019 Aiming at the characteristics of the periodic stacking structure of a lithium-ion battery core and the corresponding relationship between the air-coupled ultrasonic transmission initial wave and the wave propagation mode in each layer medium of a lithium-
Honggang Li, Zhenggan Zhou
doaj +2 more sources
Sea ice thickness from air-coupled flexural waves [PDF]
The Cryosphere, 2021 Air-coupled flexural waves (ACFWs) appear as wave trains of constant frequency that arrive in advance of the direct air wave from an impulsive source travelling over a floating ice sheet. The frequency of these waves varies with the flexural stiffness of
R. Romeyn +4 more
doaj +1 more source