Filters








241 Hits in 6.4 sec

Data-Adaptive Coherent Demodulator for High Dynamics Pulse-Wave Ultrasound Applications

Stefano Ricci, Valentino Meacci
2018 Electronics  
The proposed demodulator is integrated into a system for the detection of the velocity profile of fluids flowing in pipes.  ...  Pulse-Wave Doppler (PWD) ultrasound has been applied to the detection of blood flow for a long time; recently the same method was also proven effective in the monitoring of industrial fluids and suspensions  ...  Acknowledgments: Authors thank Johan Wiklund for his advice about fluid rheology. Conflicts of Interest: The authors declare no conflict of interest.  ... 
doi:10.3390/electronics7120434 fatcat:ygo2bf3yoresfnpb66kreq74se

Flow Velocity Measurement Using a Spatial Averaging Method with Two-Dimensional Flexural Ultrasonic Array Technology

Lei Kang, Andrew Feeney, Riliang Su, David Lines, Sivaram Nishal Ramadas, George Rowlands, Steve Dixon
2019 Sensors  
Accurate average flow velocity determination is essential for flow measurement in many industries, including automotive, chemical, and oil and gas.  ...  This research will drive new developments in ultrasonic flow measurement in a wide range of industrial applications.  ...  Acknowledgments: The authors thank Jonathan Harrington of the University of Warwick for valuable technical assistance. Conflicts of Interest: The authors declare no conflict of interest.  ... 
doi:10.3390/s19214786 pmid:31689886 pmcid:PMC6864707 fatcat:woch235i6jfh3pmplce2utb5ui

Open-Source FPGA Coprocessor for the Doppler Emulation of Moving Fluids

Stefano Ricci
2021 Micromachines  
Experiments showed its capability to emulate a fluid flowing in a pipe when investigated by an echographic Doppler system.  ...  The system can replace the complex and inaccurate flow-rigs employed in laboratorial tests of Doppler ultrasound systems and methods.  ...  Acknowledgments: Author would like to thank Alessio Ortuño for his help in the FPGA implementation of the code and in the experiments.  ... 
doi:10.3390/mi12121549 pmid:34945399 pmcid:PMC8705441 fatcat:vnxxl7n7rben7k5ixdkrsorcja

FPGA-Based Doppler Frequency Estimator for Real-Time Velocimetry

Stefano Ricci, Valentino Meacci
2020 Electronics  
In range-Doppler ultrasound applications, the velocity of a target can be measured by transmitting a mechanical wave, and by evaluating the Doppler shift present on the received echo.  ...  In several real-time applications, hundreds of thousands of velocity estimates must be produced per second, and not all of the proposed estimators are capable of performing at these high rates.  ...  Conflicts of Interest: The authors declare no conflict of interest.  ... 
doi:10.3390/electronics9030456 fatcat:aipixcx4mja7fd4sudfj5fmrai

Coriolis flowmeters: a review of developments over the past 20 years, and an assessment of the state of the art and likely future directions

Tao Wang, Roger Baker
2014 Flow Measurement and Instrumentation  
The paper, then, focuses on providing an updated review of Coriolis flow measurement technology over the past 20 years.  ...  This paper starts from a brief revisit of key early published work so that an overview of modern Coriolis flowmeters can be provided based on a historical background.  ...  Acknowledgement The authors would like to thank the management of KROHNE for encouraging and supporting such a fundamental and thorough literature study on Coriolis flow measurement.  ... 
doi:10.1016/j.flowmeasinst.2014.08.015 fatcat:qvycdjlydncefo4nrmcrniyqxu

An Improved Normalized Model of Electrical Capacitance Tomography

Yan Jiangbao, Zhou Lei, Zhu Feng, Xiangyu Tan, Zhang Changsheng, Changde Lu, Xuesheng Pei, Jianning Su
2018 MATEC Web of Conferences  
The measured capacitances by ECT system are usually normalized at the high and low permittivity for image.  ...  In this paper, we propose a method based on the center electric field line to determine the model weighting factor for the hybrid normalization model.  ...  Zhou Lei for his helpful suggestions on the use of ECT DAS during the static experiments.  ... 
doi:10.1051/matecconf/201817601032 fatcat:mxim6odrcfcddoymjskdmflyki

An On-line Automatic Flow Measurement Method for an Open Channel under Complex Flow Conditions

Tanghuai Fan, Jie Shen, Guofang Lv, Jiahua Zhang, Xijun Yan
2016 International Journal of Control and Automation  
This research designs a real-time on-line automatic measurement system, for the Pi River canal weir gate, that collects upstream and downstream water levels and the degree of opening of the gate.  ...  construct a neural network model of high precision for on-line and real-time measurement.  ...  Acknowledgements This work is supported partly by the National Natural Science Foundation of China (No.61263029, No.61374019) and the Natural Science Foundation of Jiangsu Province, China (No.BK20130851  ... 
doi:10.14257/ijca.2016.9.7.33 fatcat:wfw4gk44k5fslcz5ngvfx2qr6u

High-resolution high-speed void fraction measurements in helically coiled tubes using X-ray radiography

David Breitenmoser, Annalisa Manera, Horst-Michael Prasser, Robert Adams, Victor Petrov
2021 Nuclear Engineering and Design  
In the present paper, high-resolution measurements of the void fraction distribution for an adiabatic upward air-water two-phase flow were conducted in a transparent helically coiled acrylic pipe by means  ...  Various void fraction based features such as probability density function estimates, profiles over the height of the pipe cross-section and temporal evolutions were used to identify and characterize flow  ...  Acknowledgments The work presented herein was supported by the US Department of Energy's Nuclear Energy Advanced Modeling and Simulation (NEAMS) program as part of the Steam Generator Flow Induced Vibration  ... 
doi:10.1016/j.nucengdes.2020.110888 fatcat:nnisdf4abrcanf5xvwcmsz5c7e

Extended 3D-PTV for direct measurements of Lagrangian statistics of canopy turbulence in a wind tunnel

Ron Shnapp, Erez Shapira, David Peri, Yardena Bohbot-Raviv, Eyal Fattal, Alex Liberzon
2019 Scientific Reports  
Direct estimation of Lagrangian turbulence statistics is essential for the proper modeling of dispersion and transport in highly obstructed canopy flows.  ...  However, Lagrangian flow measurements demand very high rates of data acquisition, resulting in bottlenecks that prevented the estimation of Lagrangian statistics in canopy flows hitherto.  ...  Acknowledgements The authors are grateful to Meni Konn, Sabrina Shlain, Gregory Gulitski, Valery Babin, Amos Shick and Mordechai Hotovely, for their assistance in preparing and performing the wind tunnel  ... 
doi:10.1038/s41598-019-43555-2 pmid:31092840 pmcid:PMC6520359 fatcat:ibwlxw27djealkrddbjw7h7rk4

Experimental Control of Turbulent Boundary Layers with In-plane Travelling Waves

James Bird, Matthew Santer, Jonathan F. Morrison
2018 Flow Turbulence and Combustion  
The drag reduction was determined with constant temperature hot-wire measurements of the mean velocity gradient in the viscous sublayer, while simultaneous laser Doppler vibrometer measurements of the  ...  The experimental control of turbulent boundary layers using streamwise travelling waves of spanwise wall velocity, produced using a novel active surface, is outlined in this paper.  ...  at the measurement location, based on the uncontrolled flow.  ... 
doi:10.1007/s10494-018-9926-2 pmid:30069149 pmcid:PMC6044235 fatcat:7umjjwzixngkzio4iqthxmxy6y

Visualization system for the measurement of size and sphericity of char particles under combustion conditions

Wojciech P. Adamczyk, Andrzej Szlęk, Adam Klimanek, Ryszard A. Białecki, Gabriel Węcel, Anna Katelbach-Wozniak, Slawomir Sładek, Mario Ditaranto, Nils Erland L. Haugen
2016 Powder Technology  
Reliable kinetic data are critical for accurate simulations of coal combusted in the large industrial boilers used in the energy sector, and thus, they are a pre-requisite for computer aided boiler optimization  ...  The applicability of available methods is limited to detecting and tracking particle size and position only under cold flow conditions being the main weakness of these methods.  ...  The horizontal gas velocity profile u(y) is determined from a CFD simulation of the flow in the reactor performed for the same conditions as in the experiment.  ... 
doi:10.1016/j.powtec.2016.06.004 fatcat:6tv5xjuc3zd33ktzgwalvi3kiq

An Ultrasonic-Capacitive System for Online Characterization of Fuel Oils in Thermal Power Plants

Mateus Mendes Campos, Luiz Eduardo Borges-da-Silva, Daniel de Almeida Arantes, Carlos Eduardo Teixeira, Erik Leandro Bonaldi, Germano Lambert-Torres, Ronny Francis Ribeiro Junior, Gabriel Pedro Krupa, Wilson Cesar Sant'Ana, Levy Ely Lacerda Oliveira, Renato Guth de Paiva
2021 Sensors  
In addition, the ultrasonic system allows the estimation of the flow rate through the pipeline, hence estimating the amount of oil transferred and obtaining the total mass transferred as a feature of the  ...  This paper presents a ultrasonic-capacitive system for online analysis of the quality of fuel oils (FO), which are widely used to produce electric energy in Thermal Power Plants (TPP) due to their elevated  ...  Acknowledgments: The authors would like to thank Norte Energia S.A. and the Brazilian Research Agencies CNPq, CAPES, and ANEEL R&D for their support of this project.  ... 
doi:10.3390/s21237979 pmid:34883984 fatcat:i5j6jmqzpfapzmz2efjsjoohha

Preliminary Development Of A Hydrogen Peroxide Thruster

Y. A. Chan, H. J. Liu, K. C. Tseng, T. C. Kuo
2013 Zenodo  
Green propellants used for satellite-level propulsion system become attractive in recent years because the non-toxicity and lower requirements of safety protection.  ...  In the present research, an 1-Newton thruster prototype is designed and the thrusting force is measured by a pendulum-type platform.  ...  ACKNOWLEDGMENT Authors would like to thank professor Chao and his research group at the National Cheng Kung University for their technical support and valuable discussions.  ... 
doi:10.5281/zenodo.1087286 fatcat:auebb3ofkfgldo2h32u2k7td5m

Development of Supersonic Vehicle for Demonstration of a Precooled Turbojet Engine

Shujiro SAWAI, Kazuhisa FUJITA, Hiroaki KOBAYASHI, Shin'ichiro SAKAI, Nobutaka BANDO, Shouhei KADOOKA, Nobuyuki TSUBOI, Koji MIYAJI, Taku UCHIYAMA, Tatsuaki HASHIMOTO
2009 TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES SPACE TECHNOLOGY JAPAN  
In this paper, the system configuration of the flight-testing vehicle is outlined and development status is reported.  ...  In parallel to engine development activities, a new supersonic flight-testing vehicle for the hypersonic turbojet engine is under development since 2004.  ...  Return to the launch site of the BOV Fig. 12. Altitude and velocity profile of the BOV Fig. 13.  ... 
doi:10.2322/tstj.7.tg_27 fatcat:55x42idkd5h6jgjrznjus4ipum

The prototype GAPS (pGAPS) experiment

S.A.I. Mognet, T. Aramaki, N. Bando, S.E. Boggs, P. von Doetinchem, H. Fuke, F.H. Gahbauer, C.J. Hailey, J.E. Koglin, N. Madden, K. Mori, S. Okazaki (+5 others)
2014 Nuclear Instruments and Methods in Physics Research Section A : Accelerators, Spectrometers, Detectors and Associated Equipment  
A prototype GAPS experiment (pGAPS) was successfully flown on a high-altitude balloon in June of 2012.  ...  The General Antiparticle Spectrometer (GAPS) experiment is a novel approach for the detection of cosmic ray antiparticles.  ...  Acknowledgements Funding for the pGAPS project has been provided by NASA grants in the US, by MEXT-KAKENHI grants in Japan, and the UCLA Division of Physical Sciences.  ... 
doi:10.1016/j.nima.2013.08.030 fatcat:2krc4jnzszdchke4brvowp5fpy
« Previous Showing results 1 — 15 out of 241 results