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公开(公告)号：US11566928B2
公开(公告)日：2023-01-31
申请号：US16994562
申请日：2020-08-15
发明人： Tianshui Liu , Murad Laribi , Chang Shen
IPC分类号： G01F1/66
摘要： A flow meter for calculating fluid flow rate and/or volume includes a flow cell shaped to define an internal passageway through which the fluid travels, and four separate transducer assemblies independently mounted within mounts in the flow cell in fluid communication with the internal passageway. Each transducer assembly includes a transducer, a transducer stud with a recess in its front surface that is dimensioned to receive the transducer, and a sensor plate mounted onto the stud for retaining the transducer in the recess. A bore extends vertically through the transducer stud and into communication with the recess, the bore being dimensioned to receive wiring for the transducer. The separation and independent mounting of the four transducer assemblies in the flow cell minimizes the disruption of normal fluid flow through the internal passageway, thereby enabling greater accuracy of measurements to be achieved.
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公开(公告)号：US11313714B2
公开(公告)日：2022-04-26
申请号：US16460650
申请日：2019-07-02
发明人： Chang Shen
IPC分类号： G01F25/00
摘要： A device for measurement of ultrasonic wave transit times of an ultrasonic flow sensor consists of: 1) a synchronization signal generator, 2) a reference pulse generator, 3) a sine wave generator, 4) an analog signal amplifier, 5) a comparator, 6) a plurality of latch circuits, 7) a digital adder, 8) an integrator, 9) an A/D converter. 10) a master counter, 11) a plurality of edge counters, and 12) an arithmetic circuit. The device measures the ultrasonic wave transit times using a method of averaging the ultrasonic wave arriving limes at different measuring points (triggering point). This method has less dependency on triggering threshold level and the ultrasonic signal amplitude, and thus has less dependency on threshold drift, threshold stability, system gain fluctuation, electronic noise and signal amplitude variations. As a result, the method can greatly improve the velocity measurement accuracy and system robustness of an ultrasonic flow sensor.
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公开(公告)号：US11181392B2
公开(公告)日：2021-11-23
申请号：US16941996
申请日：2020-07-29
发明人： Chang Shen
摘要： An automatic meter reading (AMR) system includes a plurality of metering endpoints, each endpoint being configured to wirelessly transmit meter data in compliance with a data transmission schedule. A handheld unit, transported by a vehicle in proximity to the endpoints, is adapted to receive the meter data. To reduce the risk of communication collision, each endpoint is configured with techniques for modifying its transmission schedule. As one technique, each endpoint transmits meter data at a fixed time interval between successive transmissions, each transmission being applied with a random time offset to yield a non-periodic transmission cycle. As another technique, each metering endpoint is configured to transmit meter data within a designated time slot within the fixed time interval. Further, each endpoint monitors the distribution of data within the various time slots and modifies the time slot to which it is assigned to optimally balance the distribution of meter data.
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公开(公告)号：US20140096586A1
公开(公告)日：2014-04-10
申请号：US13646665
申请日：2012-10-06
发明人： Chang Shen
IPC分类号： G01F25/00
CPC分类号： G01F25/00
摘要： A device for measurement of ultrasonic wave transit times of an ultrasonic flow sensor consists of: 1) a synchronization signal generator, 2) a reference pulse generator, 3) a sine wave generator, 4) an analog signal amplifier, 5) a comparator, 6) a plurality of latch circuits, 7) a digital adder, 8) an integrator, 9) an A/D converter, 10) a master counter, 11) a plurality of edge counters, and 12) an arithmetic circuit. The device measures the ultrasonic wave transit times using a method of averaging the ultrasonic wave arriving times at different measuring points (triggering point). This method has less dependency on triggering threshold level and the ultrasonic signal amplitude, and thus has less dependency on threshold drift, threshold stability, system gain fluctuation, electronic noise and signal amplitude variations. As a result, the method can greatly improve the velocity measurement accuracy and system robustness of an ultrasonic flow sensor.
摘要翻译： 超声波流量传感器的超声波传播时间测量装置包括：1）同步信号发生器，2）参考脉冲发生器，3）正弦波发生器，4）模拟信号放大器，5）比较器， 6）多个锁存电路，7）数字加法器，8）积分器，9）A / D转换器，10）主计数器，11）多个边沿计数器，以及12）运算电路。 该装置使用在不同测量点（触发点）对超声波到达时间进行平均的方法来测量超声波传播时间。 该方法对触发阈值电平和超声信号幅度的依赖性较小，因此对阈值漂移，阈值稳定性，系统增益波动，电子噪声和信号幅度变化的依赖性较小。 结果，该方法可以大大提高超声波流量传感器的速度测量精度和系统鲁棒性。
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公开(公告)号：US11815382B2
公开(公告)日：2023-11-14
申请号：US17146876
申请日：2021-01-12
发明人： Tianshui Liu , Chang Shen , Murad Laribi
CPC分类号： G01F1/662 , G01F15/06 , G01K13/02 , H05K1/181 , H05K2201/10098 , H05K2201/10128
摘要： A flow meter for measuring the flow rate or volume of a fluid includes a flow tube shaped to define an internal passageway through which the fluid travels, a set of transducers coupled to the flow tube in fluid communication with the internal passageway, and a core module coupled to the flow tube. The core module comprises a cup-shaped enclosure shaped to define an interior cavity and a top cover mounted on the enclosure to enclose the interior cavity. A disc-shaped partition separates the interior cavity into an upper compartment which receives a printed circuit board assembly and a lower compartment which receives a power supply assembly and a connector assembly. Separating the interior cavity into distinct compartments allows for different waterproofing techniques to be utilized based on the sensitivity and lifespan differential between the various electrical components, thereby minimizing the use of potting material and facilitating component replacement.
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公开(公告)号：US20210223077A1
公开(公告)日：2021-07-22
申请号：US17146876
申请日：2021-01-12
发明人： Tianshui Liu , Chang Shen , Murad Laribi
摘要： A flow meter for measuring the flow rate or volume of a fluid includes a flow tube shaped to define an internal passageway through which the fluid travels, a set of transducers coupled to the flow tube in fluid communication with the internal passageway, and a core module coupled to the flow tube. The core module comprises a cup-shaped enclosure shaped to define an interior cavity and a top cover mounted on the enclosure to enclose the interior cavity. A disc-shaped partition separates the interior cavity into an upper compartment which receives a printed circuit board assembly and a lower compartment which receives a power supply assembly and a connector assembly. Separating the interior cavity into distinct compartments allows for different waterproofing techniques to be utilized based on the sensitivity and lifespan differential between the various electrical components, thereby minimizing the use of potting material and facilitating component replacement.
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公开(公告)号：US10775214B2
公开(公告)日：2020-09-15
申请号：US16190607
申请日：2018-11-14
发明人： Chang Shen
IPC分类号： G01F1/66 , G01N29/02 , G01N29/024
摘要： This invention provides an insertion type ultrasonic flow meter, flow measuring system and method, which related to the field of flow measuring and metering. The insertion type ultrasonic flow meter includes a first insertion type sensor and a second insertion type sensor. The first insertion type sensor is equipped with a first ultrasonic transducer; the second insertion type sensor is equipped with a second ultrasonic transducer. The first insertion type sensor and the second insertion type sensor are installed at upstream and downstream of the pipeline respectively. The first ultrasonic transducer and the second ultrasonic transducer are equipped face-to-face. Compared to current technology, the insertion type ultrasonic flow meter provided by this invention has better signal receiving capability and smaller channel noise, therefore lower power consumption that can be powered with battery. It can also conduct accurate measurement to low velocity and flow rate of water in pipeline.
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公开(公告)号：US20130180342A1
公开(公告)日：2013-07-18
申请号：US13374768
申请日：2012-01-12
申请人： Chang Shen
发明人： Chang Shen
IPC分类号： G01F1/66
摘要： An ultrasonic flow sensor comprises a flow cell body with an inlet on one side and an outlet on the other side through which the liquid or gaseous media flows; an inner flow conduit with rough surface which not only decreases the flow transition point from turbulence regime to laminar regime but also suppresses the parasitic multi-mode ultrasonic waves; one pair of electro-ultrasonic transducers for transmitting and receiving ultrasound signals; one pair of ultrasonic wave reflecting mirrors for guiding ultrasonic waves from one transducer to the other; and two reflecting mirror support fixtures which set the position and orientation of the ultrasonic wave reflecting mirrors in such a way that their disturbance to the flow inside the inner flow conduit is minimized while the ultrasonic signal strength is maintained.
摘要翻译： 超声波流量传感器包括流动池主体，其具有一侧的入口和另一侧的出口，液体或气体介质通过该流动池流动; 具有粗糙表面的内部流动管道，不仅减少了从湍流状态到层流状态的流动过渡点，而且抑制了寄生多模超声波; 一对用于发送和接收超声信号的电超声换能器; 一对超声波反射镜，用于将超声波从一个换能器引导到另一个; 以及两个反射镜支撑固定装置，其设置超声波反射镜的位置和方向，使得它们对内部流动管道内的流动的干扰最小化，同时保持超声波信号强度。
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公开(公告)号：US20210325216A1
公开(公告)日：2021-10-21
申请号：US17232270
申请日：2021-04-16
发明人： Chang Shen
摘要： A flow meter includes a hollow, two-piece, flow tube that is shaped to define an internal passageway through which a fluid travels. A pair of transducers, a set of reflectors, and a temperature sensor are mounted in the flow tube in fluid communication with the internal passageway, the reflectors being arranged to reflect a sound wave transmitted between the pair of transducers along a W-shaped travel path. The transducers and a center reflector are mounted in the top wall of the flow tube and lie within a common plane which is spaced substantially in from the interior surface of the flow tube. A cavity is formed in the interior surface of the top wall between the center reflector and each transducer, with each cavity situated outside of the designed travel path. In use, air bubbles present in the fluid collect within the cavities, thereby ensuring flow meter measurement accuracy.
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