Results 71 to 80 of about 24,386 (242)

Time resolved tracking of a sound scatterer in a turbulent flow: non-stationary signal analysis and applications [PDF]

, 2001
It is known that ultrasound techniques yield non-intrusive measurements of hydrodynamic flows. For example, the study of the echoes produced by a large number of particle insonified by pulsed wavetrains has led to a now standard velocimetry technique. In
Michel, O., Mordant, N., Pinton, J. F.
core   +4 more sources

Active Dielectric Window: A New Concept of Combined Acoustic Emission and Electromagnetic Partial Discharge Detector for Power Transformers

Energies, 2018
The detection and location of partial discharge (PD) is of great significance in evaluating the insulation condition of power transformers. This paper presents an active dielectric window (ADW), which is a new concept of combined acoustic emission (AE ...
Wojciech Sikorski
doaj   +1 more source

Development of Ultrasonic Testing Equipment Incorporating Electromagnetic Acoustic Transducer [PDF]

Journal of Nuclear Science and Technology, 1989
This paper describes an automatic flaw detection equipment and heat-resistant ultrasonic transducer for plate thickness measurement. The automatic flaw detection equipment is used during in-service inspection. It comprises an angle-beam electromagnetic acoustic transducer (EMAT), mounted on a vehicle, for scanning the pipe surface to be inspected.
Michio SATO, Motohiko KIMURA, Hideharu OKANO, Tatsuo MIYAZAWA, Koichi NAGASE, Masaaki ISHIKAWA   +5 more
openaire   +1 more source

Mapping of Physiological Signals From Wireless Battery‐Free Implants With Plane‐Wave Ultrasound Imaging

Advanced Materials Technologies, EarlyView.
Combined approach of electromagnetic (Power) and ultrasound (data harvesting) waves is proposed to address the miniaturized ultrasonic implants. Electromagnetic waves trigger the piezoelectric element to generate the acoustic pulse which is modulated by the variations in the sensor's impedance.
Anam Bhatti, Hugo Guillot, Ouafae Firdaouissi, Mohammed Irar, Lionel Rousseau, Clément Hébert, Maxime Lafond   +6 more
wiley   +1 more source

Ultrasonic metal sheet thickness measurement without prior wave speed calibration [PDF]

, 2013
Conventional ultrasonic mensuration of sample thickness from one side only requires the bulk wave reverberation time and a calibration speed. This speed changes with temperature, stress, and microstructure, limiting thickness measurement accuracy ...
Dixon, S., Fan, Yichao, Maisey, D., Nickolds, Piers, Petcher, P. A.   +4 more
core   +1 more source

Sub-MHz EMAR for Non-Contact Thickness Measurement: How Ultrasonic Wave Directivity Affects Accuracy

Sensors
Electromagnetic acoustic resonance (EMAR) is a well-established non-contact method for ultrasonic thickness measurement, typically operated at frequencies above 1 MHz using an electromagnetic acoustic transducer (EMAT).
Alexander Siegl, David Auer, Bernhard Schweighofer, Andre Hochfellner, Gerald Klösch, Hannes Wegleiter   +5 more
doaj   +1 more source

Ferroelectret-based Hydrophone Employed in Oil Identification—A Machine Learning Approach

Sensors, 2020
This work focuses on acoustic analysis as a way of discriminating mineral oil, providing a robust technique, immune to electromagnetic noise, and in some cases, depending on the applied sensor, a low-cost technique.
Daniel R. de Luna, T.T.C. Palitó, Y.A.O. Assagra, R.A.P. Altafim, J.P. Carmo, R.A.C. Altafim, A.A.O. Carneiro, Vicente A. de Sousa   +7 more
doaj   +1 more source

Multimodal Actuation and Environment Adaptive Strategies of Bio‐Inspired Micro/Nanorobots in Precision Medicine

Advanced Robotics Research, EarlyView.
An introduction for multidrive and environment‐adaptive micro/nanorobotics: design and fabrication strategies, intelligent actuation, and their applications. Various intelligent actuation approaches—magnetic, acoustic, optical, chemical, and biological—can be synergistically designed to enhance flexibility and adaptive behavior for precision medicine ...
Aiqing Ma, Han Gong, Jiacheng Ouyang, Liqi Chen, Tianfang Kang, Yiran He, Guojun Huang, Sidi Zheng, Ting Yin, Hong Pan, Lintao Cai   +10 more
wiley   +1 more source

Direct evidence for a piezoelectriclike effect in coherently strained SiGe/Si heterostructures [PDF]

, 1996
A hybrid acoustic spectroscopy technique has been used to demonstrate the (reversible) conversion of high frequency electric fields into longitudinal acoustic waves within a modulation-doped pseudomorphic Si/Si0.88Ge0.12/Si heterostructure. This provides
deKlerk, E. H. C. Parker, Foster, Li, Lockwood, M. J. Kearney, O. A. Mironov, Ourmazd, P. J. Phillips, Phillips, T. E. Whall, Tischler, V. I. Khizhny, Vasilev, Vasilev, Whall, Xie, Xie   +17 more
core   +1 more source

Comparative analysis of heat transfer dynamics in high-intensity focused ultrasound and microwave ablation for cancer treatment

International Journal of Thermofluids
This study addresses the crucial need for comparative analyses of High-intensity Focused Ultrasound (HIFU) and Microwave Ablation (MWA) as effective and minimally invasive cancer treatment techniques.
Teerapot Wessapan, Pornthip Keangin, Phadungsak Rattanadecho, Nisakorn Somsuk   +3 more
doaj   +1 more source