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公开(公告)号：US20220364895A1
公开(公告)日：2022-11-17
申请号：US17621306
申请日：2020-05-26
Applicant: Endress+Hauser Flowtec AG
Inventor： Hao Zhu , Alfred Rieder , Martin Josef Anklin , Reinhard Huber , Yaoying Lin
Abstract: A method for the measurement of a physical parameter of a liquid by means of a sensor having at least one measuring tube for conducting the liquid, wherein the measuring tube can be excited to vibrate in at least one flexural vibration mode, comprises: determining at least one current value of a vibration parameter of the flexural vibration mode; determining a measurement value of the physical parameter according to the current value of the vibration parameter, wherein the measurement value is compensated in respect of the resonator effect according to a current value for the natural frequency of the flexural vibration mode and according to the sound velocity of the liquid conducted in the measuring tube, wherein the value for the sound velocity is provided independently of the vibrations of the measuring tube.
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公开(公告)号：US20220291032A1
公开(公告)日：2022-09-15
申请号：US17607962
申请日：2020-03-31
Applicant: Endress+Hauser Flowtec AG
Inventor： Hao Zhu , Alfred Rieder , Yaoying Lin
Abstract: The disclosure relates to a measuring device for characterizing a non-homogeneous, flowable medium, and for determining the density, the mass flow rate and/or the viscosity of the medium measuring tube for guiding the medium natural frequency of which depends on the density of the medium. An exciter for exciting the mode of oscillation and an operation and evaluation circuit designed to apply an excitation signal to the exciter, to capture signals from the oscillation sensor, to determine current values of the natural frequency of the oscillator and fluctuations of the natural frequency on the basis of the signals from the oscillation sensor.
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公开(公告)号：US11326920B2
公开(公告)日：2022-05-10
申请号：US16759097
申请日：2018-10-02
Applicant: Endress+Hauser Flowtec AG
Inventor： Hao Zhu
IPC: G01F1/84
Abstract: The present disclosure relates to a Coriolis mass flow meter including two measuring tube pairs each having two measuring tubes mounted as to oscillate relative to one another and have a bending vibration excitation mode of different excitation mode natural frequencies, each pair having an electrodynamic exciter and a vibration sensor pair including a first inlet-side vibration sensor and a first outlet-side vibration sensor, and further includes a circuit configured to determine phase difference-dependent mass flow measurement values, wherein a difference deviation between a first relative signal amplitude difference of sensor signals having the first excitation mode natural frequency and a second relative signal amplitude difference of sensor signals having the second excitation mode natural frequency is not more than a tolerance value.
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公开(公告)号：US11326919B2
公开(公告)日：2022-05-10
申请号：US16770394
申请日：2018-11-13
Applicant: Endress+Hauser Flowtec AG
Inventor： Hao Zhu , Bernd Josef Schäfer
IPC: G01F1/84
Abstract: A method for determining the viscosity of a medium using a Coriolis mass flow meter comprises exciting bending vibrations in the measuring tube in a symmetrical bending vibration use mode using an exciter arranged symmetrically in relation to a longitudinal direction of the measuring tube; detecting sensor signals of a central vibration sensor also arranged symmetrically in relation to a longitudinal direction of the measuring tube; detecting sensor signals of a vibration sensor on the inlet side and of a vibration sensor on the outlet side; determining a phase relation or time delay between the sensor signals of the central vibration sensor and a symmetrical function of the sensor signals on the inlet-side and outlet-side vibration sensors; and determining the viscosity of the medium as a function of the phase relation or time delay.
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公开(公告)号：US20220074777A1
公开(公告)日：2022-03-10
申请号：US17416067
申请日：2019-11-21
Applicant: Endress+Hauser Flowtec AG
Inventor： Hao Zhu , Reinhard Huber , Gerhard Eckert , Marco Oliver Scherrer
Abstract: The flow measuring system comprises a measuring transducer having a tube arrangement to convey a flowing fluid, an exciter arrangement for forced mechanical oscillations of the tube arrangement, and a sensor arrangement for registering mechanical oscillations of the tube arrangement. The measuring system further comprises a measuring and operating electronics electrically coupled with the exciter arrangement and the sensor arrangement. The measuring system has two driver circuits and two measurement transmitter circuits. The tube arrangement includes two flow dividers and four connected tubes adapted to be flowed through by the measured substance. The exciter arrangement includes two oscillation exciters, and the sensor arrangement includes four oscillation sensors. The first measurement transmitter circuit processes measurement signals from two oscillation sensors and outputs such to the second measurement transmitter circuit The second measurement transmitter circuit processes oscillation measurement signals of the other two oscillation sensors and ascertains total flow measured values.
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Patent Agency Ranking
公开(公告)号：US20210396565A1
公开(公告)日：2021-12-23
申请号：US17357215
申请日：2021-06-24
Applicant: Endress+Hauser Flowtec AG
Inventor： Wolfgang Drahm , Hao Zhu , Alfred Rieder , Michael Wiesmann , Patrick Oudoire
Abstract: A measuring system comprises: a measuring transducer; transmitter electronics; at least one measuring tube; and at least one oscillation exciter. The transmitter electronics delivers a driver signal for the at least one oscillation exciter, and for feeding electrical, excitation power into the at least one oscillation exciter. The driver signal, has a sinusoidal signal component which corresponds to an instantaneous eigenfrequency, and in which the at least one measuring tube can execute, or executes, eigenoscillations about a resting position. The eigenoscillations have an oscillation node and in the region of the wanted, oscillatory length exactly one oscillatory antinode. The driver signal has, a sinusoidal signal component with a signal frequency, which deviates from each instantaneous eigenfrequency of each natural mode of oscillation of the at least one measuring tube, in each case, by more than 1 Hz and/or by more than 1% of said eigenfrequency.
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公开(公告)号：US20210285805A1
公开(公告)日：2021-09-16
申请号：US17254672
申请日：2019-05-10
Applicant: Endress+Hauser Flowtec AG
Inventor： Hao Zhu
IPC: G01F1/84
Abstract: The invention relates to a method for operating a Coriolis measuring device where at least two sensors register measuring tube oscillations excited by at least one exciter. The sensors are arranged one after another along a measuring tube centerline, wherein a first sensor registers a first, inlet side, oscillation characteristic of the measuring tube oscillation, and a second sensor registers at least a second, outlet side, oscillation characteristic of the measuring tube oscillation. A local concentration fluctuation or incidence fluctuation of an additional component influences the measuring tube oscillation in a region of the local concentration fluctuation or incidence fluctuation. In a first method step shifting the local concentration fluctuation or incidence fluctuation is registered using at least two sensors. In a second method step a velocity of the second component is calculated based on the registered shifting of the local concentration fluctuation or incidence fluctuation.
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公开(公告)号：US20200278230A1
公开(公告)日：2020-09-03
申请号：US16764105
申请日：2018-10-30
Applicant: Endress+Hauser Flowtec AG
Inventor： Hao Zhu , Alfred Rieder
IPC: G01F1/84
Abstract: The Coriolis flowmeter according to the present disclosure includes: a measuring sensor including a bent measuring tube mirror-symmetrical with respect to a transverse plane, wherein a measuring tube center line runs in a longitudinal plane oriented perpendicular to the transverse plane, wherein an equatorial surface runs perpendicular to the longitudinal plane along the measuring tube center line; an exciter for exciting measuring tube bending vibrations; a first pair of vibration sensors for capturing the bending vibrations of the measuring tube; and an operating and evaluation circuit for driving the exciter, for capturing signals from the vibration sensors, and for determining a mass flow measured value, wherein the measuring sensor has a second pair of vibration sensors, which are arranged in a mirror-symmetrical manner with respect to the transverse plane, wherein the first pair of vibration sensors is separated from the second pair of vibration sensors by the equatorial surface.
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公开(公告)号：US20200271494A1
公开(公告)日：2020-08-27
申请号：US16063780
申请日：2016-11-17
Applicant: Endress + Hauser Flowtec AG
Inventor： Hao Zhu , Alfred Rieder
IPC: G01F1/66
Abstract: A method for ascertaining a physical parameter of a liquid containing gas in the form of suspended bubbles by means of a measuring transducer with an excitable measuring tube serving for guiding the liquid in bending oscillation modes of various eigenfrequencies, includes steps as follows: ascertaining the eigenfrequencies of the f1-mode and the f3-mode; ascertaining preliminary density values for the gas-containing liquid guided in the measuring tube based on the eigenfrequencies of the f1-mode and the f3-mode; ascertaining a value for the velocity of sound of the gas-containing liquid guided in the measuring tube, and/or ascertaining, as a function of the velocity of sound and the eigenfrequency of a mode, at least one correction term and/or density error for the preliminary density value, which was ascertained based on the eigenfrequency of the mode, for determining a corrected density measured value; and/or a correction term for a preliminary mass flow value for determining a corrected mass flow measured value based on the first preliminary density value, the second preliminary density value, the eigenfrequency of the f1-mode and the eigenfrequency of the f3-mode.
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公开(公告)号：US10718648B2
公开(公告)日：2020-07-21
申请号：US16311953
申请日：2017-05-18
Applicant: Endress+Hauser Flowtec AG
Inventor： Hao Zhu , Alfred Rieder
Abstract: A method for determining density and/or mass flow of a compressible medium with a measuring transducer of vibration-type having at least two oscillators, each including a pair of measuring tubes, wherein the pairs of measuring tubes are arranged for parallel flow, wherein the two oscillators have mutually independent oscillator oscillations with mutually differing eigenfrequencies for corresponding oscillation modes. The method includes steps of determining the values of the eigenfrequencies of at least two different oscillator oscillations, determining at least two preliminary density measured values based on the values of the eigenfrequencies, and determining a correction term for one of the preliminary density measured values and/or for a preliminary measured value of flow based on the preliminary density measured values and the values of the eigenfrequencies.
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