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公开(公告)号：US4363244A
公开(公告)日：1982-12-14
申请号：US204902
申请日：1980-11-07
Applicant: Riadh H. A. Rabeh , John Hemp
Inventor： Riadh H. A. Rabeh , John Hemp
Abstract: The flow velocity or flow rate of a fluid containing electrical charges or magnetic dipoles is sensed by receiving a noise signal generated by movement of the charges or dipoles, and determining the mean frequency of the received signal.
Abstract translation: 包含电荷或磁偶极子的流体的流速或流速通过接收由电荷或偶极子的移动产生的噪声信号并确定接收信号的平均频率来检测。
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公开(公告)号：US5503027A
公开(公告)日：1996-04-02
申请号：US322951
申请日：1994-10-13
Applicant: John Hemp
Inventor： John Hemp
CPC classification number: G01F1/58 , G01F1/584 , G01F25/003
Abstract: An electromagnetic flowmeter with conventional orthogonal electrode and magnetic axes (x, y) intersecting the flowtube axis (z) has its electrodes constituted by two pairs (1, 2 and 3, 4) of electrodes mounted in insulating tubing (5) on each side of the flow passage through the tubing. Four conductors extend respectively from the four electrodes to enable the potential difference between the two electrodes on each side due to an axial component on each side of eddy current electric field in the liquid to be determined for self-calibration purposes in compensating automatically for any extraneous change in the magnetic field and the average potential of each pair of electrodes can also be determined to derive the velocity of flow of the liquid. One of the two pairs of electrodes can be replaced by a single electrode. The electrodes can be point electrodes or electrodes of substantial area and methods are described for mathematically adapting various types of electrodes of the required purpose and to eddy currents in parts of the assembly. The invention can also be applied to an eddy current probe for giving readings of sensitivity at a conventional flowmeter.
Abstract translation: 具有与流量管轴（z）相交的常规正交电极和磁轴（x，y）的电磁流量计具有由两侧安装在每侧的绝缘管（5）中的两对电极（1,2和3,4）构成的电极 通过管道的流动通道。 四个导体分别从四个电极延伸，以使得由于在液体中的涡流电场的每一侧上的轴向分量被确定用于自校准目的，两侧电极之间的电位差能够自动补偿任何外来的 也可以确定每对电极的磁场变化和平均电位，以导出液体的流速。 两对电极之一可以由单个电极代替。 电极可以是点电极或实质区域的电极，并且描述了用于数学上适应所需目的的各种类型的电极和组件的部分中的涡流的方法。 本发明还可以应用于涡流探针，用于在常规流量计上给出灵敏度读数。
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公开(公告)号：US4513624A
公开(公告)日：1985-04-30
申请号：US459567
申请日：1983-01-20
Applicant: Edward J. McHale , Yousif A. Hussain , Michael L. Sanderson , John Hemp
Inventor： Edward J. McHale , Yousif A. Hussain , Michael L. Sanderson , John Hemp
CPC classification number: G01F1/60
Abstract: A magnetic flowmeter of the capacitively-coupled type includes low-input impedance detection circuitry which responds to a flow induced current signal that is related to the voltage induced at the electrodes by the intersection of the flowing fluid and a time varying magnetic field. An on-line measure of the electrode capacitance that is non-interactive with the flow induced current signal is accomplished by creating a voltage difference between the process fluid and the electrodes which causes a capacitance-related current to flow from the electrodes proportional to the value of the electrode capacitance as well as the rate of change of the magnetic field. In one embodiment the primary element and the detection circuitry are referenced to a different potential than that of the process fluid and the adjacent piping of the flow system. Thus a direct, on-line measure of this capacitance can be attained in a manner that essentially eliminates stray leakage currents and that foregoes the needs for special shielding requirements such as localized, internal shields around the imbedded electrodes.
Abstract translation: 电容耦合型的磁流量计包括低输入阻抗检测电路，其响应于流动感应电流信号，其与通过流动流体和时变磁场的交点在电极处感应的电压相关。 与流动感应电流信号非交互的电极电容的在线测量通过在工艺流体和电极之间产生电压差来实现，这导致电容相关电流从电极流动而与该值成比例 的电极电容以及磁场的变化率。 在一个实施例中，主要元件和检测电路参考与流动系统的过程流体和相邻管道不同的电位。 因此，可以以基本上消除杂散漏电流的方式实现对该电容的直接的在线测量，并且可以放弃对特殊屏蔽要求的需要，例如嵌入电极周围的局部的内部屏蔽。
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Patent Agency Ranking
公开(公告)号：US5398553A
公开(公告)日：1995-03-21
申请号：US838446
申请日：1992-03-31
Applicant: John Hemp
Inventor： John Hemp
CPC classification number: G01F1/58 , G01F1/584 , G01F25/003
Abstract: An electromagnetic flowmeter with conventional orthogonal electrode and magnetic axes (x, y) intersecting the flowtube axis (z) has its electrodes constituted by two pairs (1, 2 and 3, 4) of electrodes mounted in insulating tubing (5) on each side of the flow passage through the tubing. Four conductors extend respectively from the four electrodes to enable the potential difference between the two electrodes on each side due to an axial component on each side of eddy current electric field in the liquid to be determined for self-calibration purposes in compensating automatically for any extraneous change in the magnetic field and the average potential of each pair of electrodes can also be determined to derive the velocity of flow of the liquid. One of the two pairs of electrodes can be replaced by a single electrode. The electrodes can be point electrodes or electrodes of substantial area and methods are described for mathematically adapting various types of electrodes of the required purpose and to eddy currents in parts of the assembly. The invention can also be applied to an eddy current probe for giving readings of sensitivity at a conventional flowmeter.
Abstract translation: PCT No.PCT / GB90 / 01442 Sec。 371日期：1992年3月31日 102（e）1992年3月31日PCT PCT 1990年9月19日PCT公布。 出版物WO91 / 05225 日期：1991年04月18日。具有与流管轴（z）相交的常规正交电极和磁轴（x，y）的电磁流量计具有由两对（1,2和3,4）电极构成的电极，其安装在绝缘 通过管道在流动通道的每一侧上的管道（5）。 四个导体分别从四个电极延伸，以使得由于在液体中的涡流电场的每一侧上的轴向分量被确定用于自校准目的，两侧电极之间的电位差能够自动补偿任何外来的 也可以确定每对电极的磁场变化和平均电位，以导出液体的流速。 两对电极之一可以由单个电极代替。 电极可以是点电极或实质区域的电极，并且描述了用于数学上适应所需目的的各种类型的电极和组件的部分中的涡流的方法。 本发明还可以应用于涡流探针，用于在常规流量计上给出灵敏度读数。
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公开(公告)号：US4050303A
公开(公告)日：1977-09-27
申请号：US690784
申请日：1976-05-27
Applicant: John Hemp , Derek Gerald Wyatt
Inventor： John Hemp , Derek Gerald Wyatt
Abstract: An electromagnetic flowmeter comprises an iron tube surrounding a non-magnetic electrically insulating tube through which the fluid flows. Windings formed by printed circuit conductors are located on the inner surface of the iron tube and produce a main magnetic field in one direction in the electrode plane and subsidiary magnetic fields in the opposite direction upstream and downstream of the electrode plane.
Abstract translation: 电磁流量计包括围绕流体流过的非磁性电绝缘管的铁管。 由印刷电路导体形成的绕组位于铁管的内表面上，在电极平面中沿一个方向产生主磁场，在电极平面的上游和下游沿相反方向产生辅助磁场。
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公开(公告)号：US07072775B2
公开(公告)日：2006-07-04
申请号：US10873651
申请日：2004-06-23
Applicant: John Hemp , Hoi Cheong Yeung
Inventor： John Hemp , Hoi Cheong Yeung
IPC: G06F19/00
CPC classification number: G01F1/8486 , G01F1/74 , G01F1/8436 , G01F15/024 , G01N11/16 , G01N2009/006
Abstract: A digital flowmeter can include a vibratable conduit with a mixture of a liquid and a gas flowing therethrough. A driver can be connected to the conduit and can be operable to impart motion to the conduit where a sensor can also be connected and can be operable to sense the motion of the conduit. A digital transmitter can also be connected to the conduit and can include a void fraction determination system configured to determine a gas void fraction of the mixture, a viscosity determination system configured to determine a viscosity of the liquid in the mixture, and a flow parameter correction system operable to determine a flow parameter associated with the flowing mixture, based on the gas void fraction and the viscosity.
Abstract translation: 数字流量计可以包括具有流过其中的液体和气体的混合物的可振动导管。 驱动器可以连接到管道并且可操作以将运动传递到传感器也可以连接的导管，并且可以操作以感测导管的运动。 数字发射器还可以连接到导管，并且可以包括构造成确定混合物的气体空隙率的空隙分数确定系统，被配置为确定混合物中液体的粘度的粘度确定系统，以及流量参数校正 系统，其可操作以基于气体空隙率和粘度来确定与流动混合物相关联的流动参数。
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公开(公告)号：US20050022611A1
公开(公告)日：2005-02-03
申请号：US10873651
申请日：2004-06-23
IPC: G01F20060101 , G01F1/74 , G01F1/84 , G01N9/00 , G01N11/16
CPC classification number: G01F1/8486 , G01F1/74 , G01F1/8436 , G01F15/024 , G01N11/16 , G01N2009/006
Abstract: A digital flowmeter can include a vibratable conduit with a mixture of a liquid and a gas flowing therethrough. A driver can be connected to the conduit and can be operable to impart motion to the conduit where a sensor can also be connected and can be operable to sense the motion of the conduit. A digital transmitter can also be connected to the conduit and can include a void fraction determination system configured to determine a gas void fraction of the mixture, a viscosity determination system configured to determine a viscosity of the liquid in the mixture, and a flow parameter correction system operable to determine a flow parameter associated with the flowing mixture, based on the gas void fraction and the viscosity.
Abstract translation: 数字流量计可以包括具有流过其中的液体和气体的混合物的可振动导管。 驱动器可以连接到管道并且可操作以将运动传递到传感器也可以连接的导管，并且可以操作以感测导管的运动。 数字发射器还可以连接到导管，并且可以包括构造成确定混合物的气体空隙率的空隙分数确定系统，被配置为确定混合物中液体的粘度的粘度确定系统，以及流量参数校正 系统，其可操作以基于气体空隙率和粘度来确定与流动混合物相关联的流动参数。
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公开(公告)号：US4434666A
公开(公告)日：1984-03-06
申请号：US137463
申请日：1980-04-04
Applicant: John Hemp , Yousif A. H. Al-Khazraji
Inventor： John Hemp , Yousif A. H. Al-Khazraji
Abstract: An electromagnetic flowmeter for measuring the mean velocity of a fluid flowing through a duct is described. In one embodiment the electrodes are shaped to provide a uniform weighting function relating fluid velocity distribution over the duct cross section to flowmeter output voltage representative of mean velocity. Flowmeters are described in which using large insulated electrodes sensitivity is made independent of velocity profile by either ensuring that the applied magnetic field is uniform and the virtual current in the duct is two dimensional, or vice versa.
Abstract translation: 描述用于测量流过管道的流体的平均速度的电磁流量计。 在一个实施例中，电极被成形为提供将管道横截面上的流体速度分布与表示平均速度的流量计输出电压相关联的均匀加权函数。 描述了使用大的绝缘电极灵敏度独立于速度分布的流量计，其通过确保所施加的磁场是均匀的并且管道中的虚拟电流是二维的，反之亦然。
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