Title:
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High-precision time-of-flight determination algorithm for ultrasonic flow measurement
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Author:
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Suñol Galofre, Francesc Xavier; Ochoa Guerrero, Diego A.; García García, José Eduardo
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Other authors:
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Universitat Politècnica de Catalunya. Departament de Física; Universitat Politècnica de Catalunya. CEMAD - Caracterització Elèctrica de Materials i Dispositius |
Abstract:
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Abstract:
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Commercial time-of-flight (TOF) ultrasonic flowme-
ters are rapidly expanding in the general industry. Among the
different techniques that can be applied to determine the TOF of
ultrasonic waves, the cross-correlation method presents numerous
advantages, such as robustness for weak signals and noise
suppression. However, the selection of an appropriate reference
wave is presumably a key element in the precise measurement
of TOF. In the present paper, an algorithm to compute an
accurate TOF is proposed. The form of the electric signal
received by the transducer is obtained from an acoustically-forced
underdamped oscillator model, and the analytical solution of the
model is proposed as a reference wave. In order to validate the
effectiveness of this procedure, an ultrasonic flowmeter system
is designed and tested in a flowmeter calibration test rig. It is
demonstrated that the use of the presented scheme overcome the
average method limitations, and turns out to be a convenient
solution in a wide range of conditions. Robust measurements of
near-zero flow values are acquired, which allow the achievement
of a high dynamic range. The error curve of the proposed system
have been obtained, revealing that the absolute value of the
relative errors are lower than 2% within all the spectrum of
flow rates considered (from 0.2 to 150 m
3
/h). Results demonstrate
that the algorithm provides high-precision measurements within
a wide dynamic range. The algorithm is portable and versatile:
it can be adapted to different types of transducers without the
need of additional measurements, allowing to adjust parameters
on-the-fly for an optimal performance of the ultrasonic flowmeter
system. |
Abstract:
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Peer Reviewed |
Subject(s):
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-Àrees temàtiques de la UPC::Aeronàutica i espai -Fluid flow -Flow meters -Ultrasonic waves -Cross correlation -Time-of-flight -Fluid flow measurement -Ultrasonic -Flowmeter -Fluids -- Mesurament -Ones ultrasòniques |
Rights:
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Attribution-NonCommercial-NoDerivs 3.0 Spain
http://creativecommons.org/licenses/by-nc-nd/3.0/es/ |
Document type:
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Article - Submitted version Article |
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