CN107990948A - A kind of signal processing system including electromagnetic flowmeter - Google Patents
A kind of signal processing system including electromagnetic flowmeter Download PDFInfo
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- CN107990948A CN107990948A CN201711147977.6A CN201711147977A CN107990948A CN 107990948 A CN107990948 A CN 107990948A CN 201711147977 A CN201711147977 A CN 201711147977A CN 107990948 A CN107990948 A CN 107990948A
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- 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
- G01F1/56—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects
- G01F1/58—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects by electromagnetic flowmeters
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- Electromagnetism (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Volume Flow (AREA)
Abstract
The present invention discloses a kind of signal processing system including electromagnetic flowmeter, and Electromagnetic Flow is calculated as a unlined structure, and wherein signal processing system includes：Servo amplification module, for the output signal of electrical measurement flowmeter compared with feedback signal and to be amplified, is carried out at the same time monitoring and compensation；Voltage follow module, follows the trail of output signal for buffering, improves carrying load ability；First differential amplification module, signal is exported for amplifying；Sampling and keep module, for sampled output signal and carries out analog-to-digital conversion；Second differential amplification module, amplifies the digital signal for exporting signal is carried out second；Signal amplification module is exported, digital signal accurately to be amplified, and is exported.Beneficial effect of the present invention is：Can be weak due to the signal that naked lining is brought with dynamic monitoring, while the compensation of small-signal is given, further ensure the precision of measurement.
Description
Technical field
The present invention relates to flow detection technical field, more particularly to a kind of signal processing system including electromagnetic flowmeter.
Background technology
The basic principle of electromagnetic flowmeter is Faraday's electromagnetic induction law.Conductor fluid cutting magnetic line produces induced electricity
Kinetic potential E is directly proportional to fluid flow rate V, i.e. E=K × B × D × V, and the survey of fluid flow rate V is realized by measuring induced potential E
Amount, wherein B are magnetic induction intensity, and D is measurement pipe diameter, and K is a coefficient.
At present, the measurement pipelining of electromagnetic flowmeter is insulating materials, and fluid and measurement pipe are separated, and two measurement electricity
Pole is symmetrical in measurement pipe circumferential axis.During flow measurement, insulation lining is easy to and measures existing electromagnetic flowmeter
Inner-walls of duct departs from, peels off, pulls open, so as to cause to interfere flow signal, influences measurement accuracy.In addition, on electrode
The electromotive force signal of sensing is the sense that numerous fluid infinitesimal cutting magnetic line produces in electromagnet flow meter sensor measurement pipeline
Answer the weighted sum of electromotive force.The electrode near axis fluid infinitesimal cutting magnetic line of traditional two point electrode electromagnetic flowmeters is produced
The induced electromotive force contribution that raw induced potential obtains two electrodes is very big, therefore when there are bend pipe, valve etc. in upstream
Choked flow piece, when causing flow distortion, Secondary Flow or whirlpool etc. accordingly, if between choked flow piece and electromagnetic flow transducer
Flow development length less than 5 times measurement pipe diameter when, will cause flow sensor measurement tube fluid VELOCITY DISTRIBUTION and sensing
Device central axis is asymmetric so that electromagnetic flowmeter survey result is easily influenced by Flow Field Distribution, produces larger measurement error.It is right
For Yu Zhong, large-scale electromagnetic flowmeter, many erecting beds cannot meet this requirement so that this kind of electromagnetic flowmeter is in reality
Easily influenced in use by asymmetric flow field, measurement error is larger.
The content of the invention
For the above-mentioned problems in the prior art, now providing that one kind is intended to can be with dynamic monitoring due to naked lining
The signal brought is weak, while gives the compensation of small-signal, and then ensures the signal for including electromagnetic flowmeter of measurement accuracy
Processing system.
Concrete technical scheme is as follows：
A kind of signal processing system including electromagnetic flowmeter, the Electromagnetic Flow are calculated as a unlined structure, wherein institute
Stating signal processing system includes：
Servo amplification module, the inverting input of the servo amplification module connect the power electricity of the electromagnetic flowmeter
Pole, the output terminal of the servo amplification module connect the compensating electrode of the electromagnetic flowmeter, and the servo amplification module is used for
The output signal of the electromagnetic flowmeter compared with feedback signal and is amplified, while the output signal is monitored
And compensation；
Voltage follow module, the in-phase input end of the voltage follow module connect the collection signal of the electromagnetic flowmeter
Electrode, the inverting input of the voltage follow module are connected to the output terminal of the voltage follow module, the voltage follow
Module, which is used to buffer, follows the trail of the output signal, to improve the carrying load ability of the electromagnetic flowmeter；
First differential amplification module, the in-phase input end of the first differential amplification module connect the servo amplification respectively
The in-phase input end of module and the output terminal of the voltage follow module, the inverting input point of the first differential amplification module
The in-phase input end of the servo amplification module and the output terminal of the voltage follow module, first differential amplification are not connected
Module is used to amplify the output signal；
Sampling and keep module, the input terminal of the sampling and keep module connect the output of the first differential amplification module
End, the sampling and keep module are used to sample the output signal and carry out analog-to-digital conversion；
Second differential amplification module, the in-phase input end of the second differential amplification module connect the sampling and keep module
Output terminal, the inverting input of the second differential amplification module connects the output terminal of the sampling and keep module, described the
Two differential amplification modules are amplified the digital signal of the output signal is carried out second；
Signal amplification module is exported, the input terminal of the output signal amplification module connects the second differential amplification module
Output terminal, the output signal amplification module is amplifying and export the digital signal.
Preferably, the collection signal electrode sets at least to two, and two collection signal electrodes are symmetrically distributed in
The outer of the measurement pipe.
Preferably, the power electrode, the compensating electrode and the grounding electrode are distributed in the outer of the measurement pipe
Edge.
Preferably, the power electrode sets at least to two, and the compensating electrode sets at least to four, the ground connection
Electrode sets at least to two.
Preferably, the in-phase input end of at least two voltage follow modules, each the voltage follow module is included
The corresponding collection signal electrode is connected respectively, the inverting input of each voltage follow module is connected to output terminal,
To form the self feed back circuit of each voltage follow module respectively；
The voltage follow module is voltage follower.
Preferably, the first differential amplification module and the second differential amplification module are difference amplifier.
Preferably, including at least two servo amplification modules；
The inverting input of each servo amplification module connects the corresponding power electrode, and each servo is put
The output terminal of big module connects the corresponding compensating electrode respectively.
Preferably, the servo amplification module is servo amplifier.
Preferably, including at least two sampling and keep modules；
The input terminal of two sampling and keep modules is connected to the output terminal of the first differential amplification module；
The output terminal of two sampling and keep modules is connected to the input terminal of the second differential amplification module.
Technical scheme beneficial effect is：A kind of signal processing system including electromagnetic flowmeter is disclosed, can
With dynamic monitoring since the signal that naked lining is brought is weak, while the compensation of small-signal is given, and then ensure measurement
Precision, furthermore, it can solve the problems, such as since measurement accuracy is insufficient caused by straight pipe is inadequate the defects of.
Brief description of the drawings
With reference to appended attached drawing, more fully to describe the embodiment of the present invention.However, appended attached drawing be merely to illustrate and
Illustrate, and be not meant to limit the scope of the invention.
Fig. 1 is the structure chart for the signal processing system that the present invention includes electromagnetic flowmeter；
Fig. 2 is the structure chart on electromagnetic flowmeter in the embodiment of the present invention.
Embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art obtained on the premise of creative work is not made it is all its
His embodiment, belongs to the scope of protection of the invention.
It should be noted that in the case where there is no conflict, the feature in embodiment and embodiment in the present invention can phase
Mutually combination.
The invention will be further described with specific embodiment below in conjunction with the accompanying drawings, but not as limiting to the invention.
The present invention includes a kind of signal processing system including electromagnetic flowmeter, and electromagnetic flowmeter 1 is a unlined structure,
Wherein signal processing system includes：
Servo amplification module 2, the power electrode 12 of the inverting input connection electromagnetic flowmeter 1 of servo amplification module 2, is watched
The compensating electrode 13 of the output terminal connection electromagnetic flowmeter 1 of amplification module 2 is taken, servo amplification module 2 is used for electromagnetic flowmeter 1
Output signal compared with feedback signal and amplify, while to output signal be monitored and compensate；
Voltage follow module 3, the collection signal electrode of the in-phase input end connection electromagnetic flowmeter 1 of voltage follow module 3
11, the inverting input of voltage follow module 3 is connected to the output terminal of voltage follow module 3, and voltage follow module 3 is used to buffer
Tracking output signal, to improve 1 carrying load ability of electromagnetic flowmeter；
First differential amplification module 4, the in-phase input end of the first differential amplification module 4 connect servo amplification module 2 respectively
In-phase input end and voltage follow module 3 output terminal, the inverting input of the first differential amplification module 4 connects servo respectively
The in-phase input end of amplification module 2 and the output terminal of voltage follow module 3, the first differential amplification module 4 are used to amplify output letter
Number；
Sampling and keep module 5, the input terminal of sampling and keep module 5 connect the output terminal of the first differential amplification module 4, sampling
Keep module 5 to be used for sampled output signal and carry out analog-to-digital conversion；
Second differential amplification module 6, the in-phase input end of the second differential amplification module 6 connect the defeated of sampling and keep module 5
Outlet, the output terminal of the inverting input connection sampling and keep module 5 of the second differential amplification module 6, the second differential amplification module 6
Amplify the digital signal for exporting signal is carried out second；
Signal amplification module 7 is exported, the input terminal of output signal amplification module 7 connects the defeated of the second differential amplification module 6
Outlet, exports signal amplification module 7 to amplify and export digital signal.
What is provided through the above scheme includes the signal processing system of electromagnetic flowmeter, and electromagnetic flowmeter 1 is a unlined
Structure, in being provided with excitation module in electromagnetic flowmeter 1, the output signal of electromagnetic flowmeter 1 is via the defeated of servo amplification module 2
The compensating electrode 13 of outlet connection electromagnetic flowmeter 1 is monitored and compensates, and further, servo amplification module 2, which will export, to be believed
Number compared with feedback signal and amplify, when exporting signal and balancing each other with feedback signal, servo amplification module 2 stops work
Make.
Meanwhile the output signal of electromagnetic flowmeter 1 connects the same mutually defeated of voltage follow module 3 by collection signal electrode 11
Enter end, collection flow signal, into the first differential amplification module 4, output signal is put to buffer tracking output signal
Greatly, by the analog signal of amplification is converted to digital signal by sampling and keep module 5, then digital signal is put by the second difference
Big module 6 and output signal amplification module 7 so that the small-signal exported to electromagnetic flowmeter 1 is amplified and exports.
In a kind of preferably embodiment, collection signal electrode 11 sets at least to two, two collection signal electrodes pair
Claim the outer for being distributed in measurement pipe 10.
In a kind of preferably embodiment, power electrode 12, compensating electrode 13 and grounding electrode 14 are distributed in measurement pipe
10 outer.
In a kind of preferably embodiment, power electrode 12 sets at least to two, and compensating electrode 13 sets at least to four
A, grounding electrode 14 sets at least to two.
In a kind of preferably embodiment, including at least two voltage follow modules 3, each voltage follow module 3 it is same
Phase input terminal connects corresponding collection signal electrode 11 respectively, and the inverting input of each voltage follow module 3 is connected to output
End, to form the self feed back circuit of each voltage follow module 3 respectively；
Voltage follow module 3 is voltage follower.
In a kind of preferably embodiment, the first differential amplification module 4 and the second differential amplification module 6 are differential amplification
Device.
In a kind of preferably embodiment, including at least two servo amplification modules 2；
The inverting input of each servo amplification module 2 connects corresponding power electrode 12, each servo amplification module 2
Output terminal connects corresponding compensating electrode 13 respectively.
In a kind of preferably embodiment, servo amplification module 2 is servo amplifier.
In a kind of preferably embodiment, including at least two sampling and keep modules 5；
The input terminal of two sampling and keep modules 5 is connected to the output terminal of the first differential amplification module 4；
The output terminal of two sampling and keep modules 5 is connected to the input terminal of the second differential amplification module 6.
Specifically, in the present embodiment, as shown in Fig. 2, electromagnetic flowmeter 1 is a unlined structure, in measurement pipe 10
Collection signal electrode 11, power electrode 12, compensating electrode 13 and grounding electrode 14 are uniformly distributed on outer；
Further, the output signal of electromagnetic flowmeter 1 enters the inverting input of servo amplification module 2, servo amplification
The output terminal of module 2 connects the compensating electrode 13 of corresponding electromagnetic flowmeter 1, to the signal of conductive 10 tube wall of measurement pipe consumption into
Row compensation, meanwhile, the in-phase input end connection collection buffering tracking output signal of signal electrode 11 of voltage follow module 3, output
Signal passes through the first differential amplification module 4 and sampling and keep module 5 successively, and output signal is amplified and sampled so that electricity
While magnetic flowmeter 1 is used for special dimension, and the output signal of electromagnetic flowmeter 1 can be kept with having the defeated of insulation lining
Go out that signal is identical, ensure that the accuracy of measurement；
Further, excitation module is produced flows to vertical induced field B with detected fluid, the fluid stream in measurement pipe 10
Speed is V, and under the action of induced field B, it is one that the cutting magnetic induction line of force, which produces induced electromotive force E=K × B × D × V, wherein K,
With the relevant coefficient of material electric conductivity of measurement pipe 10, D is the diameter of measurement pipe 10.
The foregoing is merely preferred embodiments of the present invention, not thereby limit embodiments of the present invention and protection model
Enclose, to those skilled in the art, should can appreciate that all with made by description of the invention and diagramatic content
Equivalent substitution and obviously change obtained scheme, should be included in protection scope of the present invention.
Claims (9)
1. a kind of signal processing system including electromagnetic flowmeter, the Electromagnetic Flow is calculated as a unlined structure, its feature exists
In the signal processing system includes：
Servo amplification module, the inverting input of the servo amplification module connect the power electrode of the electromagnetic flowmeter, institute
The output terminal for stating servo amplification module connects the compensating electrode of the electromagnetic flowmeter, and the servo amplification module is used for by described in
The output signal of electrical measurement flowmeter compared with feedback signal and amplifies, while the output signal is monitored and mended
Repay；
Voltage follow module, the in-phase input end of the voltage follow module connect the collection signal electricity of the electromagnetic flowmeter
Pole, the inverting input of the voltage follow module are connected to the output terminal of the voltage follow module, the voltage follow mould
Block, which is used to buffer, follows the trail of the output signal, to improve the carrying load ability of the electromagnetic flowmeter；
First differential amplification module, the in-phase input end of the first differential amplification module connect the servo amplification module respectively
In-phase input end and the voltage follow module output terminal, the inverting input of the first differential amplification module connects respectively
Connect the in-phase input end of the servo amplification module and the output terminal of the voltage follow module, the first differential amplification module
For amplifying the output signal；
Sampling and keep module, the input terminal of the sampling and keep module connect the output terminal of the first differential amplification module, institute
Sampling and keep module is stated to be used to sample the output signal and carry out analog-to-digital conversion；
Second differential amplification module, the in-phase input end of the second differential amplification module connect the defeated of the sampling and keep module
Outlet, the inverting input of the second differential amplification module connect the output terminal of the sampling and keep module, and described second is poor
Amplification module is divided to amplify the digital signal of the output signal is carried out second；
Signal amplification module is exported, the input terminal of the output signal amplification module connects the defeated of the second differential amplification module
Outlet, it is described to export signal amplification module to amplify and export the digital signal.
2. signal processing system according to claim 1, it is characterised in that the collection signal electrode sets at least to two
A, two collection signal electrodes are symmetrically distributed in the outer of the measurement pipe.
3. signal processing system according to claim 1, it is characterised in that the power electrode, the compensating electrode and
The grounding electrode is distributed in the outer of the measurement pipe.
4. signal processing system according to claim 3, it is characterised in that the power electrode sets at least to two,
The compensating electrode sets at least to four, and the grounding electrode sets at least to two.
5. signal processing system according to claim 1, it is characterised in that including at least two voltage follow moulds
Block, the in-phase input end of each voltage follow module connect the corresponding collection signal electrode respectively, each electricity
Pressure follows the inverting input of module to be connected to output terminal, is fed back to forming each the reflexive of voltage follow module respectively
Road；
The voltage follow module is voltage follower.
6. signal processing system according to claim 1, it is characterised in that the first differential amplification module and described the
Two differential amplification modules are difference amplifier.
7. signal processing system according to claim 3, it is characterised in that including at least two servo amplification moulds
Block；
The inverting input of each servo amplification module connects the corresponding power electrode, each servo amplification mould
The output terminal of block connects the corresponding compensating electrode respectively.
8. signal processing system according to claim 7, it is characterised in that the servo amplification module amplifies for servo
Device.
9. signal processing system according to claim 1, it is characterised in that keep mould including at least two samplings
Block；
The input terminal of two sampling and keep modules is connected to the output terminal of the first differential amplification module；
The output terminal of two sampling and keep modules is connected to the input terminal of the second differential amplification module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711147977.6A CN107990948B (en) | 2017-11-17 | 2017-11-17 | Signal processing system comprising electromagnetic flowmeter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711147977.6A CN107990948B (en) | 2017-11-17 | 2017-11-17 | Signal processing system comprising electromagnetic flowmeter |
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| CN107990948A true CN107990948A (en) | 2018-05-04 |
| CN107990948B CN107990948B (en) | 2019-12-06 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113188615A (en) * | 2021-04-28 | 2021-07-30 | 西南石油大学 | Electromagnetic flowmeter system based on dynamic offset compensation and measuring method |
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| CN101303247A (en) * | 2008-07-01 | 2008-11-12 | 上海大学 | Non-full pipe flow measurement method of conductive fluid |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113188615A (en) * | 2021-04-28 | 2021-07-30 | 西南石油大学 | Electromagnetic flowmeter system based on dynamic offset compensation and measuring method |
| CN113188615B (en) * | 2021-04-28 | 2022-04-29 | 西南石油大学 | Electromagnetic flowmeter system based on dynamic offset compensation and measuring method |
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