Patent
Time difference type ultrasonic flowmeter measurement method based on zero point analysis
Zhu Hao,Xu Fangming,Yan Li,Han Yuqi +3 more
- 09 Oct 2013
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TL;DR: In this article, a time difference type ultrasonic flowmeter measuring method based on zero point analysis is proposed for accurately determining fair current transmission time and countercurrent transmission time through a zero-point analysis method.
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Abstract: The invention discloses a time difference type ultrasonic flowmeter measuring method based on zero point analysis. The time difference type ultrasonic flowmeter measuring method based on zero point analysis is a method for accurately determining fair-current transmission time and countercurrent transmission time through a zero point analysis method. The time difference type ultrasonic flowmeter measuring method based on zero point analysis comprises the steps that (1) after a pulse drive signal is sent out, an A/D converter is started to conduct data collection; (2) a zero point value is searched; (3) whether a zero point is an ultrasonic signal zero crossing point or not is judged; (4) a first zero crossing point in an ultrasonic receiving signal is selected so that the ultrasonic signal arriving time can be determined and the fair-current transmission time and the countercurrent transmission time can be calculated; (5) instant flow of a section to be measured is calculated through the fair-current transmission time and the countercurrent transmission time. The zero point of the ultrasonic signal is not influenced by the external environment, the zero point can be detected even under the conditions that the signal is weak, fluctuation is large and interference is strong, the fair-current transmission time and the countercurrent transmission time of the ultrasonic signal in fluid can be accurately measured, the measuring accuracy of a time difference type ultrasonic flowmeter is greatly improved, and the problems brought by an existing threshold value comparing method are thoroughly solved.
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Citations
Patent
Flow measuring method of ultrasonic flow meter
Zhang Ziqi,Hui Lan,Wang Kun,Zhang Lujun,Zhang Yong,Ou Jiangbo +5 more
- 12 Mar 2014
TL;DR: In this article, a flow measuring method of an ultrasonic flow meter is described, which comprises the following steps: arranging a pair of ultrasonic sensors on the upper stream and lower stream of a gas flow channel of the UAV for transmitting and receiving ultrasonic pulse signals, providing a driving voltage for driving transmitting parts of the ultrasonic sensor nodes by using a driving module, measuring time when a timing module starts timing after ultrasonic pulses are transmitted by the sensors, stopping timing when an Nth zero crossing point is detected after first Umaxi which is larger than a pulse
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Patent
Gas ultrasonic flowmeter signal processing methods based on echo ascent stage peak value fitting and based on echo energy point positioning
Ke-Jun Xu,Tian Lei,Mu Libin,Liu Bo,Shen Ziwen,Li Jianbo +5 more
- 31 May 2017
TL;DR: In this paper, a gas ultrasonic flowmeter signal processing method based on echo ascent stage peak value fitting is presented, which includes the steps that firstly, multiple peak value points are selected at the ascent stage of echo signals according to the fitting peak value range; all the peak values points are subjected to least square fitting, and a feature straight line is obtained; intersections of the straight line and transverse axis sampling points serve as feature points, the downcurrent and countercurrent propagation time of ultrasonic signals is determined, and the gas flow is calculated.
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Patent
Impulse noise filtering method applied to time-difference-type ultrasonic flowmeter
Fu Xin,Mao Kai,Zhao Weiwei,Zehua Fang,Chen Wenyu +4 more
- 01 Jun 2016
TL;DR: In this paper, an impulse noise filtering method applied to a time-difference-type ultrasonic flowmeter is described, in which the front impulse noise is effectively filtered out, and the influence of the front pulse noise on the time difference of ultrasonic transit time measurement is avoided.
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Patent
Method for calculating ultrasonic transmission time through ultrasonic flowmeter
Yang Yang,Wei Lin +1 more
- 10 May 2017
TL;DR: In this paper, a method for calculating ultrasonic transmission time through an ultrasonic flowmeter is presented, which comprises the steps that the peak wh1 is found through a maximum value xmax of sampling values of echo signals received by an ultrasonic transducer, energy of echoes within multiple periods near the peak is calculated, a threshold value Eth is determined according to the obtained energy of the echoes within adjacent periods, and a wave with the first energy exceeding the threshold value ETH is found in the echo signals to be adopted as a reference wave to calculate the transmission time of
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Patent
Flow measuring method and device based on ultrasonic flowmeter
Yang Sheng,Zhang Jiali,Gan Hongjiang,Yu Fujun,Tang Wenhu,Xi Zhonghuai +5 more
- 10 May 2017
TL;DR: In this article, the first starting point of the fair current transmission time and the countercurrent transmission time is confirmed and calculated through a zero point analyzing method, which guarantees that the received signal is ultrasonic signal and avoids disturbance of outside noise; besides, in still water conditions, the time difference of ultrasonic transmission in forward and backward direction on the same acoustical path is not zero.
3
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Patent
Transit-time difference type ultrasonic flowmeter
Tamotsu Kobayashi,Kunikazu Shigeta,Toru Fujii +2 more
- 07 Nov 2001
TL;DR: A transit-time difference type ultrasonic flowmeter comprises a pair of ultrasonic transducers mounted on a flow tube at an upstream side and a downstream side respectively, a switching device for switching the operational mode of each of the transducers alternatively to its transmitting or receiving mode, an amplifier for amplifying the signal received by the transducer of the receiving side, and a data reduction equipment including an analog-digital converter and a digital signal processor as discussed by the authors.
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Patent
Flow rate measuring device
Kawasaki Yuki
- 29 Nov 2012
TL;DR: In this article, the authors propose a flow rate measuring device capable of reducing the measurement time of an injection amount even when a change in an injection condition is performed while changing the injection conditions.
34
Patent
Inhibition model and inhibition method for static drift of time difference ultrasonic flowmeter
Rangding Wang,Ling Yao,Ying Zhu,Chengtou Du,Yun Duan,Changgen Chen,Yahua Wang +6 more
- 17 Nov 2010
TL;DR: In this article, an inhibition model and an inhibition method for the static drift of a time difference ultrasonic flowmeter is presented. But the method is not suitable for the measurement of the arrival time of the ultrasonic signal.
23
Patent
Method for measuring propagation time of ultrasonic echo
Liling Ma,Kun Guo,Junzheng Wang +2 more
- 05 Sep 2012
TL;DR: In this article, a method for measuring the propagation time of an ultrasonic echo was proposed, which can be obtained by adopting corresponding fundamental wave signals aiming at different flow rates to carry out cross-correlation operations and search the peak values of cross correlation functions.
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Ultrasonic flowmeter and ultrasonic flow rate measuring method
TL;DR: In this paper, the first and second ultrasonic transducers are arranged so as to form a propagation path for the ultrasonic wave in a flow path of fluid, and a zero-cross detection unit is used to measure the propagation time.
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