Results 131 to 140 of about 2,645,003 (172)
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Effects of Pulsating Flow on an Ultrasonic Gas Flowmeter
Flow Measurement and Instrumentation, 1994Abstract A series of tests was carried out to assess the effects of pulsating flow on a small-dimension ultrasonic gas flowmeter. Three different parameters were investigated: pulsation amplitude, pulsation frequency and mean flow velocity. The measurements were carried out in air using a 100D straight pipe upstream of the ultrasonic gas flowmeter ...
Evert Håkansson, Jerker Delsing
exaly +2 more sources
A gas ultrasonic flowmeter for low pressure applications
2017 IEEE International Instrumentation and Measurement Technology Conference (I2MTC), 2017Compared to high pressure gas medium, the signal attenuation in low pressure gas is more serious with low Signal Noise Rate. So the gas flow measurement is more difficult. In order to solve the problem, a ultrasonic gas flow meter with transit time method is presented.
Weiguo Zhao 0002 +4 more
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A New Design for Ultrasonic Gas Flowmeter
2006 6th World Congress on Intelligent Control and Automation, 2006An ultrasonic gas flowmeter with high precision was designed for the situation of small tube caliber and fluctuating flow speed. Both weak signal detection and advanced high frequency CPLD circuit were used in this design. The flowmeter had the features of digital automatic gain control (AGC), adaptive error correction and high frequency counting.
null Zhang Ha +3 more
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Realization of a Multipath Ultrasonic Gas Flowmeter Based on Transit-Time Technique
Ultrasonics, 2014A microcomputer-based ultrasonic gas flowmeter with transit-time method is presented. Modules of the flowmeter are designed systematically, including the acoustic path arrangement, ultrasound emission and reception module, transit-time measurement module, the software and so on.
Qiang Chen, Jiangtao Wu
exaly +3 more sources
The effect of ultrasonic frequency on the accuracy of gas flowmeters
Measurement Science and Technology, 1993In time-of-flight ultrasonic gas flowmeters, the reflection of ultrasonic energy causes significant measurement uncertainties if a fast response to changing gas flow rates is required. The reflections can be attenuated by using a sufficiently high ultrasonic frequency.
M J Cunningham, K Astami
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High-Rangeability Ultrasonic Gas Flowmeter for Monitoring Flare Gas
IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 1989A transit-time ultrasonic gas flowmeter for high-rangeability requirements, such as those encountered in flare-gas flow-metering, is presented. The concept of ray rescue angle for the orientation of the ultrasonic transducers in single-beam transit-time ultrasonic flowmeters is introduced to overcome the problem of ultrasonic beam drift in high ...
exaly +3 more sources
Signal processing method for flight time measurement of gas ultrasonic flowmeter
2021 IEEE International Instrumentation and Measurement Technology Conference (I2MTC), 2021Gas ultrasonic flowmeters are widely applied in industry because of high accuracy. The time of flight (TOF) measurement is significant which determines the flowmeter performance. The traditional TOF method are easily influenced by unstable flow and noise that leads to bad results especially in large velocities.
Dandan Zheng 0002 +3 more
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Study on the Development of Ultrasonic Gas Flowmeter
Transactions of the Korean Society of Mechanical Engineers A, 2003Ultrasonic flowmeters have more advantages than the conventional method using pressure-difference. In these reasons, many advanced nations are already selling the commercial model. In RIST, we have been developed ultrasonic gas flow meter for the localization since a project was been contracted with POSCO in 1997.
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Improving interference immunity of ultrasonic gas flowmeters with clamp-on probes
Automation and Remote Control, 2013The possibility of detecting a weak desired signal passed through gas among signals propagating in the pipe wall when sounding the flow with clamp-on probes is demonstrated. The possibility of applying this method to measurement of gas flow rate in large-size pipelines is also shown.
A. D. Mansfeld +5 more
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A new type of ultrasonic gas flowmeter with multi-tracks
2008 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications, 2008In general, two major factors effect on the measurement precision of ultrasonic transit-time gas flowmeter: the calculations of gas velocity distribution in the pipe and the measurements of the transit time of ultrasonic transmitting from one transducer to another. In this paper, considering the affect factors, a new design of ultrasonic gas flow meter
Yu Ben, Zhong-ning Zhang, Shu-yi Zhang
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