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公开(公告)号：US20140318268A1
公开(公告)日：2014-10-30
申请号：US14361269
申请日：2012-11-30
Applicant: Kamstrup A/S
Inventor： Jens Lykke Sørensen , Paul Martin Bendixen
IPC: G01F1/66
Abstract: The invention relates to a method of operating an ultrasonic flow meter by digitally sampling received signals. Acoustic wave packets are transmitted through a measuring distance in opposite directions, and the received signals are digitized at a sampling frequency being below the Nyquist-limit of two times the signal frequency of the wave packet to generate digitized under-sampled signals 31. From the digitized under-sampled signals, the difference in propagation time along the measuring distance is determined.
Abstract translation: 本发明涉及一种通过数字采样接收信号来操作超声波流量计的方法。 声波分组在相反方向上通过测量距离传输，并且接收信号以低于波分组的信号频率的两倍的奈奎斯特极限的采样频率被数字化，以产生数字化的欠采样信号31.从 数字化欠采样信号，确定沿测量距离的传播时间差。
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公开(公告)号：US10564017B2
公开(公告)日：2020-02-18
申请号：US16335084
申请日：2017-09-19
Applicant: Kamstrup A/S
Inventor： Søren Tønnes Nielsen , Jens Lykke Sørensen , Paul Martin Bendixen
Abstract: Ultrasonic flowmeter for measuring the flowrate of a fluid based on transit times of opposite propagating ultrasonic wave packets, including two ultrasonic transducers arranged at a flow tube for transmitting and receiving the ultrasonic wave packets through a fluid; a control circuit configured for operating the ultrasonic transducers to transmit and receive co-propagating and counter-propagating ultrasonic wave packets, and to determine transit times between transmission and reception of the ultrasonic wave packets; wherein the control circuit is further configured to continuously determine the flowrate of the fluid based on sequential application of separate flow measurement sequences and flow estimation sequences, the flow measurement sequence including transmitting and receiving a co-propagating wave packet and a counter-propagating wave packet, determining a transit time difference between the co-propagating and the counter-propagating wave packets, determining the speed of sound in the fluid, and calculating the flowrate based on the transit time difference and the speed of sound; and the flow estimation sequence including transmitting and receiving a co-propagating wave packet and/or a counter-propagating wave packet, and based on the co-propagating or the counter-propagating wave packet, determining whether a fluid condition of the fluid has changed since the previous flow measurement.
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公开(公告)号：US20190219429A1
公开(公告)日：2019-07-18
申请号：US16335084
申请日：2017-09-19
Applicant: Kamstrup A/S
Inventor： Søren Tønnes Nielsen , Jens Lykke Sørensen , Paul Martin Bendixen
IPC: G01F1/66
CPC classification number: G01F1/668 , G01F1/662 , G01F1/667 , G01F25/0007
Abstract: Ultrasonic flowmeter for measuring the flowrate of a fluid based on transit times of opposite propagating ultrasonic wave packets, including two ultrasonic transducers arranged at a flow tube for transmitting and receiving the ultrasonic wave packets through a fluid; a control circuit configured for operating the ultrasonic transducers to transmit and receive co-propagating and counter-propagating ultrasonic wave packets, and to determine transit times between transmission and reception of the ultrasonic wave packets; wherein the control circuit is further configured to continuously determine the flowrate of the fluid based on sequential application of separate flow measurement sequences and flow estimation sequences, the flow measurement sequence including transmitting and receiving a co-propagating wave packet and a counter-propagating wave packet, determining a transit time difference between the co-propagating and the counter-propagating wave packets, determining the speed of sound in the fluid, and calculating the flowrate based on the transit time difference and the speed of sound; and the flow estimation sequence including transmitting and receiving a co-propagating wave packet and/or a counter-propagating wave packet, and based on the co-propagating or the counter-propagating wave packet, determining whether a fluid condition of the fluid has changed since the previous flow measurement.
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公开(公告)号：US09733112B2
公开(公告)日：2017-08-15
申请号：US14361269
申请日：2012-11-30
Applicant: Kamstrup A/S
Inventor： Jens Lykke Sørensen , Paul Martin Bendixen
Abstract: The invention relates to a method of operating an ultrasonic flow meter by digitally sampling received signals. Acoustic wave packets are transmitted through a measuring distance in opposite directions, and the received signals are digitized at a sampling frequency being below the Nyquist-limit of two times the signal frequency of the wave packet to generate digitized under-sampled signals 31. From the digitized under-sampled signals, the difference in propagation time along the measuring distance is determined.
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