Results 51 to 60 of about 115,036 (200)

Study on Denoising Method of Weld Defect Signal Based on SSA-VMD-WPD

Applied Sciences
Defects in welds can affect the structural safety and reliability of workpieces. Currently, the method of using phased array ultrasonic inspection technology for non-destructive testing of weld structures with high detection efficiency, good sensitivity,
Xiangqing Chen, Sifan Gong, Wei Pan, Youqing Kang, Weili Gong   +4 more
doaj   +1 more source

An investigation on chemical bubble column using ultrasonic tomography for imaging of gas profiles [PDF]

, 2014
In this paper, we carried out a tomographic investigation of a chemical bubble column using ultrasonic sensor. The ultrasonic tomography sensing array was constructed to operate in transceiver-mode and was clamped on the exterior circumference of the ...
Abdul Samad, Abdul Aziz, Goh, W. I., Iman, Muhamad Afif, Jamaluddin, N., Mohamad, Noridah, Mohd Bosro, Mohamad Zulhairi, Othuman Mydin, M. A., Tambichik, Muhamad Afiq, Wirdawati, A.   +8 more
core   +1 more source

Correction of concentrated and distributed aberrations in medical ultrasound imaging [PDF]

, 1996
A method is presented for iterative correction of wave fields aberrated in a plane located at an arbitrary distance from an array transducer. The signals received from the transducer are processed by an inverse extrapolator in such a way that the output ...
Berkhoff, A.P., Thijssen, J.M.
core   +3 more sources

Ultrasonic phased array flexible coupling detection of defects in high-voltage cable terminal lead seals

Frontiers in Mechanical Engineering
High-voltage cable terminal lead seals may develop defects such as holes, cracks, or delamination due to substandard installation quality or external forces during operation.
Peng Ziping, Zheng Jishi, Zhen Zhiming, Huang Yaosheng, Li Xiaobin, Cai Qiushen   +5 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

Design of Excitation Circuit for Logging While Drilling Ultrasonic Array Logging Tool

Cejing jishu
Through the wellbore reflection characteristics obtained by ultrasonic array logging tool while drilling, the wellbore profile is studied in real time, and the fractured formation information is obtained.
WANG Yining, TAN Baohai, SU Yuanda, ZHANG Kai, WANG Zhichen, LING Zichen   +5 more
doaj   +1 more source

Ultrafast ultrasonic imaging coupled to rheometry: principle and illustration

, 2013
We describe a technique coupling standard rheology and ultrasonic imaging with promising applications to characterization of soft materials under shear.
Fardin, Marc-Antoine, Gallot, Thomas, Grenard, Vincent, Manneville, Sebastien, Perge, Christophe, Taberlet, Nicolas   +5 more
core   +1 more source

Printing High Viscosity Fluids using Ultrasonic Droplet Generation [PDF]

, 2008
A new printing technology based on ultrasonic actuation (~1 MHz) is presented that has the potential to print high viscosity fluids. In this paper, we describe the print-head’s operating principles and construction.
Margolin, Lauren, Rosen, David W., Vohra, Sanjay   +2 more
core   +1 more source

VISUALIZATION AND QUANTITATIVE CHARACTERIZATION OF SMALL OBJECTS IN A LENS ACOUSTIC MICROSCOPE WITH A TWO-DIMENSIONAL ARRAY

Российский технологический журнал, 2018
Application of a lens multi-element acoustic microscope for the visualization and quantitative characterization of small discontinuities with dimensions of the spatial resolution level is considered.
S. A. Titov, A. N. Bogachenkov
doaj   +1 more source

Air-Coupled Ultrasonic Receivers with High Electromechanical Coupling PMN-32%PT Strip-Like Piezoelectric Elements

Sensors, 2017
For improvement of the efficiency of air-coupled ultrasonic transducers PMN-32%PT piezoelectric crystals which possess very high piezoelectric properties may be used.
Rymantas J. Kazys, Reimondas Sliteris, Justina Sestoke   +2 more
doaj   +1 more source