Feasibility study of using ultrasonic transducer border waves for centering hydrophones in ultrasonic field characterization: a theoretical and experimental approach

2005 ◽  
Author(s):  
A. Vera ◽  
E. Moreno ◽  
L. Leija
Keyword(s):  
Feasibility Study ◽  
Experimental Approach ◽  
Ultrasonic Transducer ◽  
Ultrasonic Field

Near-Field Uniform Beams for Pulsed Doppler Ultrasound

1980 ◽  
Vol 2 (4) ◽  
pp. 324-337 ◽  
Author(s):  
Chong-Cheng Fu ◽  
Sharbel E. Noujaim ◽  
Robert S. Jaffe ◽  
Levy Gerzberg ◽  
Roger D. Melen
Keyword(s):  
Flow Measurement ◽  
Pattern Analysis ◽  
Ultrasonic Transducer ◽  
Near Field ◽  
Ultrasonic Field ◽  
Beam Pattern ◽  
Field Approach ◽  
Pulsed Doppler Ultrasound ◽  
Pulsed Ultrasonic

A mathematical model for the beam pattern of a pulsed ultrasonic transducer is introduced. Beam-pattern analysis and simulation of a circular transducer based on this model agree well with the experimental results. It is demonstrated that, in its near field, the pulsed transducer is capable of generating a good approximation to a uniform ultrasonic field which cannot be achieved with a cw transducer. Preliminary error analysis indicates that the near-field beam pattern of the pulsed transducer is suitable for quantitative blood-flow measurement, and design criteria are developed for this application. A prototype has been fabricated and tested in in-vitro experiments, and the results verify the feasibility of the quantitative blood flowmeter principle and the pulsed-transducer near-field approach to the formation of uniform beams.

scholarly journals Design and Development of a Novel Ultrasonic Field Wetting Angle Measuring Instrument for Researching the Wetting of the Liquid–Solid Interface

Crystals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1400
Author(s):  
Jingtao Zhao ◽  
Liping Ning ◽  
Zongming Jiang ◽  
Yinglong Li
Keyword(s):  
Composite Materials ◽  
Modal Analysis ◽  
Longitudinal Vibration ◽  
Ultrasonic Transducer ◽  
Technical Problem ◽  
Ultrasonic Field ◽  
Wetting Angle ◽  
Measuring Instrument ◽  
Solid Interface ◽  
Angle Measuring

A key technical problem in the preparation of Al-Ti-C grain refiner and other composite materials is the poor wetting of the Al-C interface, which greatly restricts the development of the preparation technology of related composite materials. In view of this scientific challenge, a novel ultrasonic field wetting angle measuring instrument has been designed to research the wetting behavior of the liquid–solid interface and ensure that preparation conditions are optimized. The dimensional parameters of the ultrasonic transducer and the horn in the novel ultrasonic wetting angle measuring instrument have been designed by theoretical calculation, and the modal analysis was performed for the ultrasonic horn using the functions of displacement and time. Modal analysis was utilized to optimize the dimension of the ultrasonic horn, and the natural frequency of the longitudinal vibration of the horn was reduced from 22,130 Hz to 22,013 Hz, resulting in an error rate between the actual value (22,013 Hz) and the design value (20 kHz) of less than 1%. In addition, the influence of different transition arc radiuses on the maximum stress of the optimized ultrasonic horn was analyzed.

scholarly journals Development of a MATLAB Environment Software for Simulation of Ultrasonic Field (Desarrollo de un software en MATLAB para la simulación de campo ultrasónico)

2014 ◽  
Vol 7 (13) ◽  
Author(s):  
Reynaldo Tronco Gasparini ◽  
Vera Lúcia da Silveira Nantes Button
Keyword(s):  
Mathematical Method ◽  
Biomedical Engineering ◽  
Ultrasonic Transducer ◽  
Computational Simulation ◽  
Ultrasonic Field ◽  
Ultrasonic Transducers ◽  
Modular Architecture ◽  
Graphic Interface ◽  
Engineering Department ◽  
Simulation Parameters

The study of the acoustic field generated by an ultrasonic transducer is fundamental to its construction and characterization, because it defines how it will behave before being built. It also defines whether it is feasible or not, for the application to which it was designed. It can also lead to modifications to the project so it behaves as expected. In this work, a software was implemented in MATLAB®, for computational simulation of acoustic fields generated by ultrasonic transducers of different configurations. Two models were used, Zemanek and Stepanishen. Transducers with focus and apodization and transmission medium with attenuation may also be simulated. For the simulation of Zemanek’s model, the mathematical method of discretization was used. The Stepanishen’s model used an analytical solution for the impulse response. The developed programs were aggregated into a computer package, named FSIM, and a graphic interface was created. The user can choose among some of the transducer configurations and simulation parameters already implemented. FSIM has a modular architecture and allows further simulation modules to be added. The simulations were validated comparing results to those previously published in classical papers from Zemanek, and from Lockwood and Willete, in addition to prior results from research studies conducted at the Biomedical Engineering Department of the School of Electrical and Computing Engineering at the Universidade Estadual de Campinas (UNICAMP).Resumen: El estudio del campo acústico generado por un transductor ultrasónico es fundamental para su construcción y caracterización, ya que define cómo se comportará antes de ser construido. También define si realmente es factible para la aplicación a la que fue diseñado, y también puede sugerir modificaciones al proyecto, para que se comporte como se espera. En este trabajo un software fue implementado en MATLAB®, para la simulación computacional de los campos acústicos generados por los transductores ultrasónicos de diferentes configuraciones. Dos modelos fueran usados, Zemanek y Stepanishen. Transductores con el enfoque y apodización y medios con atenuación también pueden ser simulados. Para la simulación del modelo de Zemanek, se utilizó el método matemático de discretización y para el modelo de Stepanishen, se empleó una solución analítica para la respuesta impulsiva. Los programas desarrollados fueron agregados en un paquete computacional, llamado FSIM, y una interfaz gráfica fue creada. El usuario puede elegir entre algunas configuraciones del transductor y parámetros de simulación ya implementados; FSIM tiene una arquitectura modular y permite que otros módulos de simulación sean añadidos. Las simulaciones fueron validadas comparando resultados obtenidos previamente por otros trabajos de investigación del Departamento de Ingeniería Biomédica de la Facultad de Ingeniería Eléctrica y Computación de la UNICAMP y por los artículos clásicos de Zemanek y Lockwood y Willette.

An Experimental Approach for the Offshore Launching of Jack-Ups

2014 ◽  
Vol 136 (2) ◽  
Author(s):  
Claudio A. Rodríguez ◽  
Mário Moura ◽  
Paulo T. T. Esperança ◽  
Jacques Raigorodsky
Keyword(s):  
Feasibility Study ◽  
Experimental Approach ◽  
Model Tests ◽  
Building Site ◽  
Test Setup ◽  
Dry Dock ◽  
Jack Up

Recently, as part of the building contract for the new Brazilian jack-up drilling platforms, an operational challenge was raised: to launch these units from the building site, where neither dry dock nor launching ground ways exist. Economically, the best alternative was to launch these jack-ups using the available barges used commonly for jacket launch. Due to the marked differences between a jacket and a jack-up, the implementation of this novel launch operation required a careful feasibility study. Model tests were required to measure the motions of the barge and the jack-up and to evaluate the loads on the barge rocker arms. The present paper discusses the experimental approach, test setup, calibration procedures, and some results from the hydrodynamics perspective.

Feasibility study of ultrasonic biometrics based on finger vessel imaging by epitaxial-PZT/Si piezoelectric micromachined ultrasonic transducer

2020 ◽  
Vol 312 ◽  
pp. 112145 ◽  
Author(s):  
Ziyi Liu ◽  
Shinya Yoshida ◽  
Toshiaki Horie ◽  
Shoji Okamoto ◽  
Ryoichi Takayama ◽  
...  
Keyword(s):  
Feasibility Study ◽  
Ultrasonic Transducer ◽  
Vessel Imaging
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