EP1987327A1 - Dispositifs de mesure en ligne et procede de correction d erreurs de mesure dans des dispositifs de mesure en ligne - Google Patents

Dispositifs de mesure en ligne et procede de correction d erreurs de mesure dans des dispositifs de mesure en ligne

Info

Publication number
EP1987327A1
EP1987327A1 EP06830551A EP06830551A EP1987327A1 EP 1987327 A1 EP1987327 A1 EP 1987327A1 EP 06830551 A EP06830551 A EP 06830551A EP 06830551 A EP06830551 A EP 06830551A EP 1987327 A1 EP1987327 A1 EP 1987327A1
Authority
EP
European Patent Office
Prior art keywords
mixture
measuring tube
excitation signal
oscillation
phase
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP06830551A
Other languages
German (de)
English (en)
Inventor
Wolfgang Drahm
Alfred Rieder
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Endress and Hauser Flowtec AG
Original Assignee
Endress and Hauser Flowtec AG
Flowtec AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Endress and Hauser Flowtec AG, Flowtec AG filed Critical Endress and Hauser Flowtec AG
Priority to EP08168408A priority Critical patent/EP2026042A1/fr
Priority to EP06830551A priority patent/EP1987327A1/fr
Publication of EP1987327A1 publication Critical patent/EP1987327A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
    • G01F1/78—Direct mass flowmeters
    • G01F1/80—Direct mass flowmeters operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
    • G01F1/84—Coriolis or gyroscopic mass flowmeters
    • G01F1/845—Coriolis or gyroscopic mass flowmeters arrangements of measuring means, e.g., of measuring conduits
    • G01F1/8468—Coriolis or gyroscopic mass flowmeters arrangements of measuring means, e.g., of measuring conduits vibrating measuring conduits
    • G01F1/849—Coriolis or gyroscopic mass flowmeters arrangements of measuring means, e.g., of measuring conduits vibrating measuring conduits having straight measuring conduits
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/74—Devices for measuring flow of a fluid or flow of a fluent solid material in suspension in another fluid
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
    • G01F1/78—Direct mass flowmeters
    • G01F1/80—Direct mass flowmeters operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
    • G01F1/84—Coriolis or gyroscopic mass flowmeters
    • G01F1/8409—Coriolis or gyroscopic mass flowmeters constructional details
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
    • G01F1/78—Direct mass flowmeters
    • G01F1/80—Direct mass flowmeters operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
    • G01F1/84—Coriolis or gyroscopic mass flowmeters
    • G01F1/8409—Coriolis or gyroscopic mass flowmeters constructional details
    • G01F1/8413—Coriolis or gyroscopic mass flowmeters constructional details means for influencing the flowmeter's motional or vibrational behaviour, e.g., conduit support or fixing means, or conduit attachments
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
    • G01F1/78—Direct mass flowmeters
    • G01F1/80—Direct mass flowmeters operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
    • G01F1/84—Coriolis or gyroscopic mass flowmeters
    • G01F1/8409—Coriolis or gyroscopic mass flowmeters constructional details
    • G01F1/8413—Coriolis or gyroscopic mass flowmeters constructional details means for influencing the flowmeter's motional or vibrational behaviour, e.g., conduit support or fixing means, or conduit attachments
    • G01F1/8418—Coriolis or gyroscopic mass flowmeters constructional details means for influencing the flowmeter's motional or vibrational behaviour, e.g., conduit support or fixing means, or conduit attachments motion or vibration balancing means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
    • G01F1/78—Direct mass flowmeters
    • G01F1/80—Direct mass flowmeters operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
    • G01F1/84—Coriolis or gyroscopic mass flowmeters
    • G01F1/8409—Coriolis or gyroscopic mass flowmeters constructional details
    • G01F1/8431—Coriolis or gyroscopic mass flowmeters constructional details electronic circuits
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
    • G01F1/78—Direct mass flowmeters
    • G01F1/80—Direct mass flowmeters operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
    • G01F1/84—Coriolis or gyroscopic mass flowmeters
    • G01F1/8409—Coriolis or gyroscopic mass flowmeters constructional details
    • G01F1/8436—Coriolis or gyroscopic mass flowmeters constructional details signal processing
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
    • G01F15/02—Compensating or correcting for variations in pressure, density or temperature
    • G01F15/022—Compensating or correcting for variations in pressure, density or temperature using electrical means
    • G01F15/024—Compensating or correcting for variations in pressure, density or temperature using electrical means involving digital counting

Definitions

  • the invention relates to an In-line measuring device having a transducer of
  • the vibratory-type especially a Coriolis mass-flow/density measuring device
  • measured value representing a physical, measured quantity of the medium, for example a mass flow rate, a density and/or a viscosity.
  • invention relates to a method for compensation, in such In-line measuring
  • parameters such as e.g. the mass flow rate, density and/or viscosity, such
  • inline measuring devices especially Coriolis mass flow measuring devices, are used, which bring about reaction forces in the medium, such as e.g.
  • WO-A 03/095950 WO-A 03/095949, WO-A 03/076880, WO-A 02/37063, WO-A 01/33174, WO-A 00/57141 , WO-A 99/39164, WO-A 98/07009, WO-A
  • the vibratory transducers include at least one
  • the tube segment is caused to vibrate, driven by an electromechanical exciter arrangement.
  • an electromechanical exciter arrangement For registering vibrations of the
  • the vibratory transducers additionally include an electrophysical sensor arrangement
  • mass flow rate of a medium flowing in a pipeline rests, for example, on having the medium flow through the measuring tube inserted into the
  • phase shift serves as a
  • the oscillations of the measuring tube are,
  • density of the flowing medium can also be measured by means of such inline
  • straight measuring tubes can, as is known, upon being excited to torsional
  • the vibratory transducer can also be used to determine, at
  • vibratory transducer especially Coriolis mass flow measuring devices, have the ability to measure, in any case, also density, viscosity and/or
  • phase shift can be subject to fluctuations to a considerable
  • inhomogeneous media can, for example, be liquids, into which, as is e.g.
  • a dissolved medium e.g.
  • phase media media, a flow, respectively medium, conditioning preceding the actual
  • the classifiers can,
  • oscillation frequency of about 80 Hz is a sampling rate of about 55 kHz or
  • oscillation measurement signals have to be samples with a sampling ratio of
  • the medium to be measured and its usually
  • the pipeline, into which the vibratory transducer is to be inserted might have to be adapted to the vibratory transducer, rather than the reverse, which can
  • the measuring tubes might have a
  • An object of the invention is, therefore, to provide a corresponding inline
  • a further object is to provide corresponding methods for producing a corresponding measured value.
  • the invention resides in a method for measuring at
  • an inline measuring device including a measurement transducer of
  • the vibration-type and a measuring device electronics electrically coupled with said measurement transducer, said mixture consisting of at least one
  • the method comprises a step of conducting the mixture to be measured within at least one measuring tube of
  • the method comprises a step of feeding an exciter arrangement with an excitation signal, said exciter
  • said excitation signal including at least a first excitation signal component corresponding to a first one of a plurality of natural eigenmodes
  • the method comprises a step of vibrating said at least one measuring tube within said first one of said
  • At least said second natural eigenmode is stimulated, at least
  • the method comprises a step of
  • measurement signal includes at least a first measurement signal component
  • measurement signal includes at least a second measurement signal
  • the method comprises a step
  • the at least one parameter may the
  • measured value may said concentration value representing the
  • the method comprises a step
  • the measurement tube vibrating is essentially not stimulated by the exciter arrangement at least temporary.
  • the excitation signal is
  • the method further includes a step of flowing said mixture through said at least one measuring tube.
  • the method further comprises a step
  • said driving mode having at least one oscillation frequency that equals
  • the first natural eigenmode of the measuring tube may have also an
  • first natural eigenmode may different from an instantaneous resonance
  • Said instantaneous signal frequency of said second measurement signal component may further used for
  • the first excitation signal component in a sixth embodiment of the invention, the first excitation signal component
  • the method further comprises a step of
  • eigenmode may different from a second oscillation factor, which represents
  • the first oscillation factor may represent a ratio of said oscillation
  • the second oscillation factor may represent a ratio of said oscillation amplitude
  • the excitation signal may comprise a step of adjusting said excitation signal such that said first oscillation factor is less than said second oscillation factor.
  • a signal-to-noise ratio of said second excitation signal component may less than two.
  • signal, fed to said exciter arrangement may include at least a third signal
  • the method further comprises
  • phase may further comprise a step of flowing said mixture through said at
  • the method further comprises steps of selecting from said excitation signal said first excitation signal component,
  • the method further comprises steps
  • the method further comprises
  • phases of the mixture is solid, i.e. granular.
  • the measuring tube and generating at least one oscillation measurement
  • signal representing oscillations of the vibrating measuring tube may comprise a step of using a sensor arrangement responsive to vibrations of
  • said at least measuring tube said being electrically coupled with a
  • measuring device electronics of said inline measuring device electronics of said inline measuring device.
  • to move relative to the measuring tube may comprise a step of flowing said mixture through said at least one measuring tube.
  • step of vibrating said at least one measuring tube includes, at
  • the invention resides in an inline measuring device, for example a Coriolis mass-flow/density measuring device and/or a viscosity measuring
  • phase mixture flowing in a pipeline, which inline measuring device
  • the vibratory-type transducer is electrically coupled with the vibratory-type transducer.
  • transducer includes at least one measuring tube inserted into the course of the pipeline.
  • the at least one measuring tube serve for conducting the
  • An exciter arrangement of the transducer may
  • the device electronics is adapted to deliver, at least at times, an excitation current driving the exciter arrangement. Further the inline measuring device
  • the measuring device electronics may adapted to
  • the inline measuring device According to a further aspect of the invention the inline measuring device
  • a mass flow rate may be used for measuring at least one parameter, especially a mass flow rate, a
  • the invention bases on the surprising discovery that, contrary to the
  • mass flow error may corrected during operation of the inline measuring
  • the inventive model is also able
  • a further advantage of the invention is, additionally, to be seen
  • measurement signals can be sampled, as before, with a usual sampling ratio
  • Fig. 1 shows an inline measuring device which can be inserted into a
  • Fig. 3 shows, sectioned in a side view, the vibratory transducer of Fig.
  • Fig. 4 shows the vibratory transducer Fig. 2 in a first cross section
  • Fig. 5 shows the vibratory transducer of Fig. 2 in a second cross
  • Fig. 6 shows schematically in the form of a block diagram
  • Fig. 7 shows measurement errors on gas concentration
  • Fig. 8 shows schematically a Coriolis tube model
  • Fig . 11 shows the X-Component of the velocity field in the tube cross- section
  • Fig. 12a, b show a model for a moving resonator forced by the tube
  • Fig . 13 shows amplitudes of tube x (solid) and resonator u (dashed);
  • Fig. 14 shows schematically an arrangement for realizing an error
  • FIG. 15 shows a schematic of an experimental setup for validating error compensation schemes according to the invention
  • Fig. 21 f1 mode resonance frequencies measured by a spectrum analyzer
  • Fig. 1 shows, respectively, an inline measuring device 1 suited for
  • a physical, measured quantity e.g. a mass flow rate, m , a
  • the medium is
  • phases of the mixture may gaseous, liquid or solid, i.e. granular. Therefore,
  • media may be a liquid-gas mixture, a vapor, a powder, granulate, aerated oil,
  • the inline measuring device 1 may also suited for determining a concentration of at least one phase of a mixture consisting of at least one
  • first mixture phase and at least one second mixture phase. Furthermore, the
  • physical parameter may selected from a group of parameters consisting of
  • mass flow rate of said at least one first mixture phase of the mixture mean density of at least one of said first mixture and second mixture phases of the
  • the inline measuring device 1 for example provided in the form of a Coriolis mass flow, density and/or viscosity meter, includes therefor a vibratory
  • transducer 10 flowed-through by the medium to be measured, an example of
  • a measuring device electronics 500 as illustrated schematically in Figs. 2
  • measuring device electronics 500 may, additionally, so designed that it can, during operation of the inline measuring device 1 , exchange measurement
  • PLC programmable logic controller
  • PLC personal computer
  • workstation via a data transmission system, for example a field bus
  • the measuring device electronics is designed such as
  • the, especially programmable, measuring device electronics 500 is equipped with a corresponding communications interface for a communication of data, e.g. for the transmission of the measurement
  • an electronics housing 200 is additionally
  • the inline measuring device includes a vibratory transducer, which is flowed-through by the medium to be measured, and
  • reaction forces especially Coriolis forces, dependent on the mass flow rate
  • the mass flow rate, the density and/or the viscosity of the medium can be any suitable parameter e.g. the mass flow rate, the density and/or the viscosity of the medium.
  • the vibratory transducer includes at least one measuring tube 10 of
  • the at least one measuring tube is predeterminable measuring tube diameter.
  • 10 may be a curved tube or, as shown in Fig. 3 and 4, an essentially straight
  • the tube 10 is caused to vibrate, at least at
  • the measuring tube lumen means here, that a spatial form and/or a spatial
  • the measuring tube 10 in predeterminable manner cyclically, especially periodically; compare, in this connection, also US-A 4,801 ,897, US-A
  • the vibratory transducer serving for
  • implementation of the invention can, as well, be selected from a multiplicity
  • vibratory transducers having two parallel, straight measuring tubes flowed-through by the medium to be measured, such as are
  • the vibratory transducer 1 additionally has a vibratory
  • Housing 100 acts to protect tube 10 and other components
  • the vibratory transducer housing 100 also serves as a mounting platform for an
  • the vibratory transducer housing 100 is provided with a neck-like neck-like neck-like neck-like neck-like neck-like neck-like neck-like neck-like neck-like neck-like neck-like neck-like neck-like neck-like neck-like neck-like neck-like neck-like neck-like neck-like neck-like neck-like neck-like neck-like neck-like neck-like neck-like neck-like neck-like neck-like neck-like neck-like
  • transition piece on which the electronics housing 200 is appropriately fixed
  • the measuring tube 10 is oscillatably suspended in the preferably rigid, especially bending- and twisting-stiff, transducer housing 100.
  • the measuring tube is inserted into
  • inlet tube piece 11 and outlet tube piece 12 are aligned with one another
  • measuring tube 10 and tube pieces 11 , 12 can, however, also be
  • vibratory transducers can be used, such as e.g. alloys of iron, titanium,
  • first and second flanges 13, 14 are preferably formed on the inlet
  • the transducer housing 100 is provided, fixed to the inlet and outlet tube pieces 11 , 12, for accommodating the measuring tube
  • the measuring tube 10 is
  • driving mode excited in a first mode of oscillation, so called “driving mode” or “useful
  • measuring tube 10 executes, at least in part, oscillations, i.e. bending
  • the at least one measuring tube is
  • the measuring tube 10 executes oscillations in a first eigenmode such that it
  • the at least one measuring tube conducting said mixture vibrates also in a second one of said plurality of its natural
  • bending oscillation of two, or four, antinodes can e.g. serve as the second
  • the at least one measuring 10 is also driven, at least at times, in a torsional mode
  • this excitement is such that the measuring tube
  • one measuring tube 10 is caused to vibrate alternatingly in at least two
  • This lowest bending eigenfrequency can be, for
  • the measuring tube 10 may excited
  • a lowest torsional eigenfrequency can, for example, lie in the case of a straight measuring tube about in the range of twice the lowest bending
  • the oscillations of the measuring tube 11 are damped, on the one hand, by transfer of oscillation energy, especially to the medium.
  • a counteroscillator 20 is, therefore, provided in the
  • the counteroscillator 20 is, as shown schematically in Fig. 2, preferably
  • the counteroscillator 20 serves, among other things, to balance the vibratory transducer dynamically for at least one, predetermined density
  • the value of the medium for example a density value most frequently to be
  • the single measuring tube 10 preferably twisting about its longitudinal axis L, thus holding the environment of the vibratory transducer, especially,
  • the counteroscillator 20 can be made of practically any of the materials
  • the measuring tube 10 also used for the measuring tube 10, thus, for example, stainless steel,
  • measuring tube 10 somewhat less torsionally and/or bendingly elastic
  • the counteroscillator 20 is
  • the counteroscillator 20 is adjusted also in at least one
  • counteroscillator 20 has, for this purpose, grooves 201 , 202, which make
  • the longitudinal axis L can, if required, also be arranged, without more,
  • the mass distribution of the counteroscillator can, as likewise
  • mass balancing bodies 101 , 102 can be e.g. metal rings pushed onto the
  • the vibratory transducer additionally includes an exciter arrangement 40,
  • arrangement 40 serves for converting an electrical exciter power P exc fed
  • the measuring device electronics e.g. having a regulated excitation
  • the exciter arrangement 40 can include, as
  • plunger coil arrangement having a cylindrical exciter coil attached to the counteroscillator 20 or to the inside of the transducer housing 100.
  • the exciter coil has a corresponding excitation current i exc flowing
  • arrangement 40 can also be realized by means of a plurality of plunger coils,
  • transducer additionally includes a sensor arrangement 50, which produces, as a representation of vibrations of the measuring tube 10 at least one
  • sensor arrangement includes at
  • At least a first oscillation sensor 51 which reacts to vibrations of the measuring
  • the oscillation sensor 51 can be formed by means of a permanently magnetic
  • armature which is fixed to the measuring tube 10 and interacts with a sensor coil mounted on the counteroscillator 20 or the transducer housing.
  • sensors can be used. Of course, other sensors known to those skilled in the art as suitable for detection of such vibrations can be used.
  • arrangement 60 includes, additionally, a second oscillation sensor 52,
  • the second sensor 51 especially one identical to the first oscillation sensor 51.
  • the second sensor 51 is especially one identical to the first oscillation sensor 51.
  • sensors 51 , 52 are in this embodiment so arranged in the vibratory transducer 10, separated from one another along the length of the
  • oscillation measurement signals S 2 which usually each exhibit a signal
  • the at least one oscillation measurement signal may include at least a second
  • the exciter arrangement 40 is,
  • the exciter arrangement 40 has, for such purpose, at least one first
  • the exciter coil 41a is
  • the exciter coil 41a can also be held by the counteroscillator 20 and the
  • the oscillation sensors 51 , 52 can be so designed
  • the sensor coil 51 a The sensor coil 51 a
  • measuring tube 10 and counteroscillator 20 in changing their relative position and/or their relative motions between measuring tube 10 and counteroscillator 20 in changing their relative position and/or their relative motions between measuring tube 10 and counteroscillator 20 in changing their relative position and/or their relative motions between measuring tube 10 and counteroscillator 20 in changing their relative position and/or their relative motions between measuring tube 10 and counteroscillator 20 in changing their relative position and/or their relative
  • the sensor coil 51a therefor can, however, also be fixed to the counteroscillator 20 and the armature 51 b coupled therewith can,
  • measuring tube 10 In another embodiment of the invention, measuring tube 10, counteroscillator 20 and the sensor and exciter arrangements 40, 50
  • the inner part is advantageously so constructed that it has a
  • first principal axis of inertia Ti aligned with the inlet tube piece 11 and the outlet tube piece 12 and lying at least sectionally within the measuring tube
  • measuring tube 10 are highly mechanically decoupled from one another;
  • the displacement of the center of mass MS and also the first principal axis of inertia Ti toward the longitudinal axis of the measuring tube can, for
  • measuring tube longitudinal axis L is essentially symmetrical, at least, however, invariant relative to an imaginary rotation about the longitudinal
  • longitudinal axis L of the measuring tube or at least is kept as small as
  • This can e.g. be achieved by having a common center of mass of
  • the exciter arrangement 40 is, for
  • the innermost axis of inertia in, at most, one point.
  • the innermost axis of inertia in, at most, one point.
  • the exciter arrangement 40 has, for this purpose, at least one first
  • Exciter coil 41a is fixed
  • the exciter coil 41a can also be mounted to the
  • the exciter arrangement has
  • axis of inertia T 2 can be produced by means of such two, or four, coil
  • the exciter coil 41a exhibit another inductance than the respective others, or
  • the sensor arrangement According to another embodiment of the invention, the sensor arrangement
  • a sensor coil 51a arranged in a sensor coil 51a arranged in a sensor coil 51a arranged in a sensor coil 51a arranged in a sensor coil 51a arranged in a sensor coil 51a arranged in a sensor coil 51a arranged in a sensor coil 51a arranged in a sensor coil 51a arranged in a sensor coil 51a arranged in a sensor coil 51a arranged in a sensor coil 51a arranged in a sensor coil 51a arranged
  • the sensor coil 51a is arranged as near as possible to an armature 51 b
  • the sensor coil 51a therefor can, instead, be fixed to the counteroscillator 20 and, in
  • arrangement 50 can also have, in the manner known to those skilled in the
  • the exciter arrangement 40 is fed with
  • the excitation signal may include at least a first excitation signal component corresponding to said first one of
  • the exciter arrangement 40 may, as already mentioned,
  • the excitation current i exc can be e.g. harmonically multifrequent or even rectangular.
  • oscillations of the measuring tube 10 can advantageously be so chosen and
  • oscillating measuring tube 10 oscillates essentially in a torsional oscillation
  • components i exC L and i exc ⁇ can, depending on the type of operation selected,
  • the excitation signal may include at least a first and a second excitation
  • measuring tube 10 is caused to oscillate during operation, are adjusted differently from one another, a separation of the individual oscillation modes
  • the measuring device electronics includes a corresponding driver circuit 53, which is controlled by a lateral oscillation
  • oscillation amplitude adjustment signal yAMT representing the desired
  • the driver circuit 53 can be realized e.g.
  • excitation current i exc or the components i exC L, i exc ⁇ of the excitation current.
  • electronics 500 can serve for producing the lateral amplitude adjustment
  • the amplitude control circuit 51 actualizes the amplitude adjustment signals
  • yAML, yAMT on the basis of instantaneous amplitudes of at least one of the two oscillation measurement signals S 2 measured at the instantaneous lateral oscillation frequency and/or the instantaneous torsional oscillation
  • PROMASS 80 such as are available from the assignee, for example in
  • amplitude control circuit is preferably so constructed that the lateral
  • oscillations of the measuring tube 10 are controlled to a constant amplitude
  • the frequency control circuit 52 and the driver circuit 53 can be constructed
  • phase-locked loops which are used in the manner known to those skilled in the art for adjusting the lateral oscillation frequency adjusting
  • oscillation measurement signals S 2 and the excitation current i exc to be adjusted respectively the instantaneously measured excitation current i exc .
  • circuit 51 and the frequency control circuit 52 are, as shown schematically in
  • Fig. 6 realized by means of a digital signal processor DSP provided in the
  • codes can be stored persistently or even permanently e.g. in a non-volatile
  • volatile data memory RAM of the measuring device electronics 500 e.g.
  • analog-to-digital converters A/D into corresponding digital signals for a processing in the signal processor DSP; compare, in this connection, EP-A
  • V AML amplitude adjusting signals
  • Y AMT amplitude adjusting signals
  • the frequency adjusting signals V FML , Y FMT can be, in corresponding manner,
  • measurement signals s-i, S 2 are additionally sent to a measurement circuit 21
  • the measurement circuit 21 is
  • circuit serves for determining, in the manner known per se to those skilled in
  • a measured value Xx serving here as a
  • the measurement circuit 21 can be any,
  • measuring circuits which measure, and correspondingly evaluate, phase and/or time differences between oscillation
  • the measurement circuit 21 can also serve to utilize an
  • oscillation frequency of the at least one measuring tube 11 as measured, for example, on the basis of at least one of the oscillation measurement signals
  • the measurement circuit can also be used to determine a
  • the measurement circuit may derive such measured value from the excitation
  • inline measuring device can determine the separate measured values X x , i.e.
  • X x can be stored temporarily in the measuring device electronics and
  • measurement circuit 21 can, furthermore, also be implemented by means of
  • first and second phases in the flowing medium for example gas bubbles and/or solid particles entrained in liquids
  • the mass flow rate m i.e. the measured value
  • measuring tube - compare in this connection, especially US-A 4,524,610.
  • Fig. 7 shows exemplarily a typical behaviour of a
  • MRM moving resonator model
  • time shift between two harmonic sensor signals measured at the inlet and the outlet of the tube corresponds to the mass flow.
  • the information needed for the measurement of flowing fluid can be derived by evaluating the
  • a and A define the areas of cross-
  • section and pf and p are the densities of the tube and the fluid, respectively.
  • the first term represents the bending force layer of the tube
  • the tube of length / is fixed at both ends
  • Fig. 9 the symmetric driving mode and the antisymmetric Coriolis mode for a single straight measuring tube are shown.
  • ⁇ D and ⁇ c may take the values 2.365 and 3.926, for example, and the
  • the real driving frequency may about 286.7 Hz for air and 218.6 Hz for water.

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Measuring Volume Flow (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)

Abstract

Dispositif de mesure comprenant un transducteur de type vibratoire servant à mesurer un mélange multiphasique et des composants électroniques couplés électriquement au transducteur de type vibratoire. Le transducteur comporte au moins un tube de mesure inséré le long d’une conduite. Un ensemble excitateur exerce une action sur ledit au moins un tube de mesure pour le faire vibrer. Un ensemble détecteur détecte les vibrations dudit au moins un tube de mesure et fournit au moins un signal de mesure d’oscillations représentant les oscillations dudit au moins un tube de mesure. Les composants électroniques du dispositif de mesure délivrent en outre un courant d’excitation pour alimenter l’ensemble excitateur. Le dispositif de mesure est conçu pour corriger les erreurs de mesure dues à la présence du mélange multiphasique à partir d’un modèle de résonateur mobile (MRM).
EP06830551A 2005-12-27 2006-12-12 Dispositifs de mesure en ligne et procede de correction d erreurs de mesure dans des dispositifs de mesure en ligne Withdrawn EP1987327A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP08168408A EP2026042A1 (fr) 2005-12-27 2006-12-12 Dispositifs de mesure en ligne et procédé pour compenser des erreurs de mesure dans les dispositifs de mesure en ligne
EP06830551A EP1987327A1 (fr) 2005-12-27 2006-12-12 Dispositifs de mesure en ligne et procede de correction d erreurs de mesure dans des dispositifs de mesure en ligne

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP05028481 2005-12-27
PCT/EP2006/069603 WO2007074055A1 (fr) 2005-12-27 2006-12-12 Dispositifs de mesure en ligne et procede de correction d’erreurs de mesure dans des dispositifs de mesure en ligne
EP06830551A EP1987327A1 (fr) 2005-12-27 2006-12-12 Dispositifs de mesure en ligne et procede de correction d erreurs de mesure dans des dispositifs de mesure en ligne

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EP1987327A1 true EP1987327A1 (fr) 2008-11-05

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EP06830551A Withdrawn EP1987327A1 (fr) 2005-12-27 2006-12-12 Dispositifs de mesure en ligne et procede de correction d erreurs de mesure dans des dispositifs de mesure en ligne

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JP (1) JP5114427B2 (fr)
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JP2009521693A (ja) 2009-06-04
CA2634959A1 (fr) 2007-07-05
WO2007074055A1 (fr) 2007-07-05
CN101336364A (zh) 2008-12-31
CA2634959C (fr) 2013-02-05
EP2026042A1 (fr) 2009-02-18
JP5114427B2 (ja) 2013-01-09
CN101336364B (zh) 2011-04-13

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