Results 41 to 50 of about 1,899,314 (382)
A 2D ultrasonic array design incorporating hexagonal-shaped elements for NDE applications [PDF]
, 2010 Contemporary 2D Ultrasonic arrays suffer from low SNR and limited steering capabilities. Yet, there is a great desire in the industry to increase the operational frequency, in order to enhance their volumetric imaging resolution.
Dziewierz, J. +4 more
core +1 more source
Air-Coupled Ultrasonic Spiral Phased Array for High-Precision Beamforming and Imaging
IEEE Open Journal of Ultrasonics, Ferroelectrics, and Frequency Control, 2022 Sparse spiral phased arrays are advantageous for many emerging air-coupled ultrasonic applications, since grating lobes are prevented without being constrained to the half-wavelength element spacing requirement of well-known dense arrays.
Gianni Allevato +6 more
semanticscholar +1 more source
Total focussing method for volumetric imaging in immersion non destructive evaluation [PDF]
, 2007 This paper describes the use of a 550 (25x22) element 2MHz 2D piezoelectric composite array in immersion mode to image an aluminum test block containing a collection of artificial defects.
Drinkwater, B. +6 more
core +1 more source
Energies, 2019 Previous studies have indicated that a basic frost layer negatively affects the heat-transfer efficiency and is difficult to remove using a single ultrasonic transducer.
Haihui Tan +4 more
doaj +1 more source
Prototyping Airborne Ultrasonic Arrays
, 2022 Focused ultrasound is the base mechanism for mid-air tactile feedback generation, acoustic levitation, wireless power transfer, directional audio and other emerging applications. The basic required set-up is an ultrasonic emitter with the capability of focusing its acoustic power at a target point. Ideally, a multi-emitter phased array is used since it
openaire +2 more sources
, 2020 Frost dramatically deteriorates the operating performance of an air source heat pump unit and leads to additional energy consumption. Results of our previous study show that intermittent ultrasonic vibration can greatly improve the coefficient of ...
Haihui Tan +4 more
semanticscholar +1 more source
Design and micromachining of a stretchable two-dimensional ultrasonic array
Micro and Nano Engineering, 2021 Focused ultrasound using stretchable ultrasonic arrays is a very attractive method for ultrasound neuromodulation. However, the structure and fabrication of the arrays have brought great challenges for the development of stretchable ultrasonic arrays. In
Wei Liu +3 more
doaj +1 more source
A Robust Approach to Optimal Matched Filter Design in Ultrasonic Non-Destructive Evaluation (NDE) [PDF]
, 2016 The matched filter was demonstrated to be a powerful yet efficient technique to enhance defect detection and imaging in ultrasonic non-destructive evaluation (NDE) of coarse grain materials, provided that the filter was properly designed and optimized ...
Hayward, Gordon, Li, Minghui
core +3 more sources
Contactless Fluid Manipulation in Air: Droplet Coalescence and Active Mixing by Acoustic Levitation [PDF]
, 2018 Acoustic manipulation by an ultrasonic phased array provides an entirely new approach to processes such as coalescence, mixing, separation, and evaporation occurring in the generation of new materials, physical property measurement, the biomedical ...
Abe Yutaka +3 more
core +2 more sources
International Journal of Distributed Sensor Networks, 2013 Near-field ultrasonic phased array theory is researched and utilized in the carbon-fiber wing box to identify the damage in the structure. Near-field ultrasonic phased array based structural health monitoring is researched to overcome the limitation of ...
Yajie Sun +3 more
doaj +1 more source