Results 11 to 20 of about 20,357 (252)
Research and Review Journal of Nondestructive Testing, 2023 Millimeter-wave radar imaging is a promising technique in non-destructive testing. When a small material defect is located closely to the test object’s surface, the strong reflection caused by the air-material interface can overlap with the defect’s ...
Ingrid Ullmann +2 more
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Air-Coupled Reception of a Slow Ultrasonic A0 Mode Wave Propagating in Thin Plastic Film
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
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Shipin gongye ke-ji, 2022 In order to understand the effect of air-borne ultrasound on the catabolic pathway of glucosinolates in broccoli florets during air drying, the drying property, contents of key components (glucosinolates, sulforaphane, ascorbic acid, Fe2+ and phenolic ...
Beini LIU +5 more
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Accelerated Air-coupled Ultrasound Imaging of Wood Using Compressed Sensing
BioResources, 2015 Air-coupled ultrasound has shown excellent sensitivity and specificity for the nondestructive imaging of wood-based material. However, it is time-consuming, due to the high scanning density limited by the Nyquist law.
Yiming Fang +4 more
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Airborne ultrasound pulse amplification based on acoustic resonance switching
Scientific Reports, 2022 Airborne ultrasound radiation pressure, a nonlinear effect that appears as a static force in mid-air in the presence of strong ultrasound, has recently been applied in novel scientific and industrial fields.
Yuki Hashimoto, Yasuaki Monnai
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Experimental Evaluation of Three Designs of Electrodynamic Flexural Transducers
Sensors, 2016 Three designs for electrodynamic flexural transducers (EDFT) for air-coupled ultrasonics are presented and compared. An all-metal housing was used for robustness, which makes the designs more suitable for industrial applications.
Tobias J. R. Eriksson +5 more
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Phased-Array Approach to Air-coupled Ultrasound with Resonant Defect Excitation
Research and Review Journal of Nondestructive Testing, 2023 Wave propagation in air-coupled ultrasound (ACUT) is slower compared to ultrasound in immersion technique. Due to the lower velocity of sound the maximum pulse repetition rate is five times smaller than in water coupled ultrasound.
Timo Reindl +3 more
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Development of Fuel Debris Inspection Methods using Air-Coupled Ultrasound
E3S Web of Conferences, 2018 Japan has decided to start fuel debris removal on 2021. Therefore, before starting retrieval of the fuel debris, investigation of location, shape, and also properties of fuel debris have to be performed.
Hamdani Ari +5 more
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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 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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