Results 11 to 20 of about 10,296 (259)
Sensors, 2020 Ultrasonic array imaging algorithms have been widely developed and used for non-destructive evaluation (NDE) in the last two decades. In this paper two widely used time domain algorithms are compared with two emerging frequency domain algorithms in terms
Zeyu Zhuang +3 more
doaj +1 more source
Sensors, 2020 Plane wave imaging (PWI) is attracting more attention in industrial nondestructive testing and evaluation (NDT&E). To further improve imaging quality and reduce reconstruction time in ultrasonic imaging with a limited active aperture, an optimized PWI ...
Hao Sui +3 more
doaj +1 more source
Design of Ultrasonic Synthetic Aperture Imaging Systems Based on a Non-Grid 2D Sparse Array
Sensors, 2021 This work provides a guide to design ultrasonic synthetic aperture systems for non-grid two-dimensional sparse arrays such as spirals or annular segmented arrays.
Júlio Cesar Eduardo de Souza +3 more
doaj +1 more source
Thin ceramic PZT dual- and multi-frequency pMUT arrays for photoacoustic imaging
Microsystems & Nanoengineering, 2022 Miniaturized ultrasonic transducer arrays with multiple frequencies are key components in endoscopic photoacoustic imaging (PAI) systems to achieve high spatial resolution and large imaging depth for biomedical applications. In this article, we report on
Qincheng Zheng +7 more
doaj +1 more source
Development of Broadband High-Frequency Piezoelectric Micromachined Ultrasonic Transducer Array
Sensors, 2021 Piezoelectric micromachined ultrasonic transducers (PMUT) are promising elements to fabricate a two-dimensional (2D) array with a pitch small enough (approximately half wavelength) to form and receive arbitrary acoustic beams for medical imaging. However,
Xu-Bo Wang +7 more
doaj +1 more source
Applied Sciences, 2021 In photoacoustic imaging, the use of arrayed laser sources brings several advantages. Acoustic waves can be generated with flexible control of wavefronts, bringing functionality such as ultrasonic beam steering and focusing. The use of arrays reduces the
Ruijie Hou +9 more
doaj +1 more source
Three-dimensional mid-air acoustic manipulation by ultrasonic phased arrays. [PDF]
PLoS ONE, 2014 The essence of levitation technology is the countervailing of gravity. It is known that an ultrasound standing wave is capable of suspending small particles at its sound pressure nodes. The acoustic axis of the ultrasound beam in conventional studies was
Yoichi Ochiai +2 more
doaj +1 more source
Control of Levitating Particle in Ultrasound Field
MATEC Web of Conferences, 2018 The experimental setup for ultrasonic controlled levitation in the air has been developed. Two phased arrays made of 91 ultrasonic radiators placed in front of each other are used. Arrays are focused in the region of particle levitation.
Sukhanov Dmitry +6 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
JamSys: Coverage Optimization of a Microphone Jamming System Based on Ultrasounds
IEEE Access, 2019 With the development of digital devices, the recording process has become increasingly easier to conduct. However, the portability of the recording devices has also made recording difficult to monitor.
Hao Shen +4 more
doaj +1 more source