Results 21 to 30 of about 10,296 (259)

Design of 2D Planar Sparse Binned Arrays Based on the Coarray Analysis

Sensors, 2021
The analysis of the beampattern is the base of sparse arrays design process. However, in the case of bidimensional arrays, this analysis has a high computational cost, turning the design process into a long and complex task.
Óscar Martínez-Graullera, Júlio Cesar Eduardo de Souza, Montserrat Parrilla Romero, Ricardo Tokio Higuti   +3 more
doaj   +1 more source

Spot weld analysis with 2D ultrasonic Arrays [PDF]

Journal of Research of the National Institute of Standards and Technology, 2004
This paper describes a threefold method of testing the performance of an array-based ultrasonic tool for nondestructive testing of spot welds. The tool is described in its capabilities, use, and advantages over existing counterparts. Performance testing for and the results from carrying out the testing are described.
Denisov, A. A., Shakarji, C. M., Lawford, B. B., Maev, R. Gr., Paille, J. M.   +4 more
openaire   +2 more sources

Annular arrays for novel ultrasonic measurement techniques [PDF]

Journal of Sensors and Sensor Systems, 2016
The paper shows how the precise knowledge of the sound field of an ultrasonic annular array can contribute to the development of novel measurement techniques. Emphasis is placed on (a) a non-invasive method for sound velocity measurements in fluids using
M. Wolf, E. Kühnicke, S. Kümmritz, M. Lenz   +3 more
doaj   +1 more source

Air-Coupled Low Frequency Ultrasonic Transducers and Arrays with PMN-32%PT Piezoelectric Crystals

Sensors, 2017
Air-coupled ultrasonic techniques are being increasingly used for material characterization, non-destructive evaluation of composite materials using guided waves as well as for distance measurements.
Rymantas J. Kazys, Reimondas Sliteris, Justina Sestoke   +2 more
doaj   +1 more source

Research on ultrasonic imaging systems based on scattering field theory [PDF]

AIP Advances
In an ultrasonic array system, increasing the effective aperture generally improves lateral resolution. However, conventional 2-D arrays require a proportional increase in hardware channels, which limits scalability. This makes it essential to develop an
Kai Yabumoto, Takayoshi Yumii, Kenjiro Kimura   +2 more
doaj   +1 more source

The Multi-Frame Imaging Detection of Ultrasonic Guided Waves in Welded Structural Plates Based on Arc Sparse Array with Left Rank

Applied Sciences
The imaging detection of ultrasonic guided waves in plates using arc sparse arrays is highly significant for weld scattering conditions. A novel approach for detecting welded plate structures using the left rank of ultrasonic guided waves in arc sparse ...
Xinjie Zhu, Sen Yao, Mingxi Deng, Jie Zhang, Yan Gao   +4 more
doaj   +1 more source

Application of Phase-Reversal Fresnel Zone Plates for Improving The Elevation Resolution in Ultrasonic Testing with Phased Arrays

Sensors, 2019
Currently, phased arrays have found wide application in ultrasonic nondestructive testing.
Dmitry O. Dolmatov, Daniel Tarrazó-Serrano, German A. Filippov, Igor V. Minin, Oleg V. Minin, Dmitry A. Sednev   +5 more
doaj   +1 more source

A Gas Flow Measurement System Based on Lead Zirconate Titanate Piezoelectric Micromachined Ultrasonic Transducer

Micromachines, 2023
Ultrasonic flowmeter is one of the most widely used devices in flow measurement. Traditional bulk piezoelectric ceramic transducers restrict their application to small pipe diameters.
Tao Liu, Zhihao Li, Jiahuan Zhang, Dongxiao Li, Hanjie Dou, Pengfan Wu, Jiaqian Yang, Wangyang Zhang, Xiaojing Mu   +8 more
doaj   +1 more source

Full Waveform Inversion for NDT using ultrasonic linear arrays

Research and Review Journal of Nondestructive Testing, 2023
Ultrasonic (UT) imaging is a widespread technique for nondestructive testing (NDT). The state-of-the-art UT image reconstruction algorithms are based on delay-and-sum (DAS) operations, which assume constant acoustic velocity across the tested objects ...
Daniel Rossato, Felipe Derewlany Gutierrez, Giovanni A. Guarneri, Thiago Alberto Rigo Passarin, Gustavo P. Pires, Daniel Rodrigues Pipa   +5 more
doaj   +1 more source

Comparative Evaluation of Hemodiafiltration, Hemoperfusion, and Standard Hemodialysis on Efficacy, Inflammatory Control, Dialysis Adequacy, and Safety in End‐Stage Renal Disease: A Prospective Observational Study

Therapeutic Apheresis and Dialysis, EarlyView.
ABSTRACT Background Chronic micro‐inflammation in patients with end‐stage renal disease (ESRD) is a significant driver of cardiovascular complications and diminished quality of life. While standard hemodialysis (SHD) effectively manages small‐molecule clearance, its ability to remove medium‐to‐large uremic toxins—the primary catalysts of systemic ...
Hongwei Zuo, Weisi Dai, Jie Mao, Mei Ye, Xingshan Lu, Xiaocui Zhang   +5 more
wiley   +1 more source