CN104266692A - Dual-stimulation electromagnetic flowmeter - Google Patents
Dual-stimulation electromagnetic flowmeter Download PDFInfo
- Publication number
- CN104266692A CN104266692A CN201410561329.5A CN201410561329A CN104266692A CN 104266692 A CN104266692 A CN 104266692A CN 201410561329 A CN201410561329 A CN 201410561329A CN 104266692 A CN104266692 A CN 104266692A
- Authority
- CN
- China
- Prior art keywords
- excitation
- microprocessor
- electrode
- signal
- double
- 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.)
- Pending
Links
Landscapes
- Measuring Volume Flow (AREA)
Abstract
The invention discloses a dual-stimulation electromagnetic flowmeter, and the dual-stimulation electromagnetic flowmeter comprises an exciting coil, an exciting device, an electrode, a signal processing circuit, an A/D convertor and a microprocessor; the exciting device offers the exciting current for the exciting coil in two different exciting periods and switches the exciting periods selectively to obtain the initial flow signal of two type of exciting frequency, the measuring error caused by the inducing noise can be effectively eliminated, the zero point adjustment incurring the flow stop is not executed, the measuring precision is improved and the reliability is high.
Description
Technical field
The present invention relates to a kind of double-excitation electromagnetic flow meter.
Background technology
Weighting function of electromagnetic flowmeter is an imaginary physical quantity, and its physical meaning is: during electromagnetic flowmeter work, measure each point produces in pipeline section space induction electromotive force to output voltage between electrode make the size contributed.Scientists has made clear and definite definition to the numerical values recited of certain some weighting function in measuring pipe of electromagnetic flow meter section space, that is: when unitary current flows through two electrodes, during composition current loop, and the size of this current density.Therefore, also there are many documents that weighting function is referred to as empty electric current, and the measuring system of electromagnetic flowmeter is namely for by this Current calculation flow, but current electromagnetic flowmeter is all the excitation cycles adopting the fixed cycle, therefore each obtained data on flows is all based on this excitation cycle, the reliability of measurement is not high.
Summary of the invention
In order to overcome the deficiencies in the prior art, the invention provides a kind of double-excitation electromagnetic flow meter.
The technical solution adopted for the present invention to solve the technical problems is:
Double-excitation electromagnetic flow meter, comprising:
Be arranged on the magnetizing coil measuring the upper and lower both sides of pipe fitting, this magnetizing coil provides magnetic field to described measuring tube inside;
Magnetizer, this magnetizer is connected with magnetizing coil, and provides exciting curent with two different excitation cycles to described magnetizing coil;
Electrode, this electrode is arranged on measures the pipe fitting left and right sides, the electric current produced for detecting flow cutting magnetic line in measurement pipe fitting;
Signal processing circuit, this signal processing circuit and Electrode connection, for the treatment of the current signal detected by electrode;
A/D converter, this A/D converter is connected with signal processing circuit, for being digital signal by analog-signal transitions;
Microprocessor, this microprocessor is connected with A/D converter, when being used for producing electromotive force in excitation cycle when between described electrode often kind described, according to the described electromotive force extrapolation flow signal produced during described excitation cycle, this microprocessor is also connected with magnetizer, to switch different excitation cycles.
Described microprocessor carries out extrapolation computing according to the linear function of excitation cycle.
Described signal processing circuit comprises amplifying circuit, filtering circuit, and signal exports successively after amplifying circuit, filtering circuit.
Also comprise a display, this display is connected with microprocessor.
Described microprocessor is preferably the MSP430 single-chip microcomputer of Hong Kong TI company or Dutch PHILIPS company 80C552 single-chip microcomputer.
The invention has the beneficial effects as follows: magnetizer of the present invention provides exciting curent with two different excitation cycles to described magnetizing coil, and the excitation cycle selectivity of two is changed, the initial flow signal of two magnet excitation frequencies can be obtained, effectively can eliminate the measuring error because induced noise causes, and improve measuring accuracy, and reliability is high.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the present invention is further described.
Fig. 1 is structure principle chart of the present invention.
Embodiment
With reference to the structure principle chart that Fig. 1, Fig. 1 are the present invention's specific embodiments, as shown in the figure, 1 double-excitation electromagnetic flow meter, comprising:
Be arranged on the magnetizing coil 2 measuring the upper and lower both sides of pipe fitting, this magnetizing coil 2 provides magnetic field to described measuring tube inside;
Magnetizer, this magnetizer is connected with magnetizing coil, and provides exciting curent with two different excitation cycles to described magnetizing coil;
Electrode 1, this electrode 1 is arranged on measures the pipe fitting left and right sides, the electric current produced for detecting flow cutting magnetic line in measurement pipe fitting;
Signal processing circuit, this signal processing circuit is connected with electrode 1, for the treatment of the current signal detected by electrode 1;
A/D converter, this A/D converter is connected with signal processing circuit, for being digital signal by analog-signal transitions;
Microprocessor, this microprocessor is connected with A/D converter, when being used for producing electromotive force in excitation cycle when between described electrode often kind described, according to the described electromotive force extrapolation flow signal produced during described excitation cycle, this microprocessor is also connected with magnetizer, to switch different excitation cycles.
Magnetizer of the present invention provides exciting curent with two different excitation cycles to described magnetizing coil 2, and the excitation cycle selectivity of two is changed, the initial flow signal of two magnet excitation frequencies can be obtained, effectively can eliminate the measuring error because induced noise causes, and improve measuring accuracy, and reliability is high.
Further, described signal processing circuit comprises amplifying circuit, filtering circuit, signal exports successively after amplifying circuit, filtering circuit, namely filtering circuit carries out filtering to the output of signal amplification circuit, reduce the impact of interference noise, obtain the first-harmonic of flow velocity signal, and make the power of multiple interference noise reduce with bandwidth and reduce, improve signal to noise ratio (S/N ratio), improve the measuring accuracy of electromagnetic flowmeter.
As preferably, described microprocessor is preferably the MSP430 single-chip microcomputer of Hong Kong TI company or Dutch PHILIPS company 80C552 single-chip microcomputer, and described microprocessor is also connected with a display, to show flow measurement result.
As preferably, described microprocessor carries out extrapolation computing according to the linear function of excitation cycle.
Above better enforcement of the present invention is illustrated; certainly; the present invention can also adopt form different from the embodiment described above; the equivalent conversion that those of ordinary skill in the art do under the prerequisite without prejudice to spirit of the present invention or change accordingly, all should belong in protection scope of the present invention.
Claims (5)
1. double-excitation electromagnetic flow meter, is characterized in that: comprising:
Be arranged on the magnetizing coil (2) measuring the upper and lower both sides of pipe fitting, this magnetizing coil (2) provides magnetic field to described measuring tube inside;
Magnetizer, this magnetizer is connected with magnetizing coil, and provides exciting curent with two different excitation cycles to described magnetizing coil;
Electrode (1), this electrode (1) is arranged on measures the pipe fitting left and right sides, the electric current produced for detecting flow cutting magnetic line in measurement pipe fitting;
Signal processing circuit, this signal processing circuit is connected with electrode (1), for the treatment of the current signal detected by electrode (1);
A/D converter, this A/D converter is connected with signal processing circuit, for being digital signal by analog-signal transitions;
Microprocessor, this microprocessor is connected with A/D converter, when being used for producing electromotive force in excitation cycle when between described electrode often kind described, according to the described electromotive force extrapolation flow signal produced during described excitation cycle, this microprocessor is also connected with magnetizer, to switch different excitation cycles.
2. double-excitation electromagnetic flow meter according to claim 1, is characterized in that: described microprocessor carries out extrapolation computing according to the linear function of excitation cycle.
3. double-excitation electromagnetic flow meter according to claim 1, is characterized in that: described signal processing circuit comprises amplifying circuit, filtering circuit, and signal exports successively after amplifying circuit, filtering circuit.
4. double-excitation electromagnetic flow meter according to claim 1, is characterized in that: also comprise a display, and this display is connected with microprocessor.
5. double-excitation electromagnetic flow meter according to claim 1, is characterized in that: described microprocessor is preferably the MSP430 single-chip microcomputer of Hong Kong TI company or Dutch PHILIPS company 80C552 single-chip microcomputer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410561329.5A CN104266692A (en) | 2014-10-21 | 2014-10-21 | Dual-stimulation electromagnetic flowmeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410561329.5A CN104266692A (en) | 2014-10-21 | 2014-10-21 | Dual-stimulation electromagnetic flowmeter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104266692A true CN104266692A (en) | 2015-01-07 |
Family
ID=52158233
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410561329.5A Pending CN104266692A (en) | 2014-10-21 | 2014-10-21 | Dual-stimulation electromagnetic flowmeter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104266692A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0394121A (en) * | 1989-09-07 | 1991-04-18 | Toshiba Corp | Electromagnetic flow meter |
| CN1760643A (en) * | 2005-11-10 | 2006-04-19 | 上海大学 | Parallel type electromagnetic flowmeter with dual excitations |
| CN101718565A (en) * | 2009-11-26 | 2010-06-02 | 上海大学 | Double-excitation electromagnetic flow meter based on photoelectrical coupling |
| CN101900584A (en) * | 2009-05-25 | 2010-12-01 | 哈尔滨理工大学 | Narrow-band filtering micro-flow electromagnetic flowmeter and modulation and demodulation method thereof |
-
2014
- 2014-10-21 CN CN201410561329.5A patent/CN104266692A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0394121A (en) * | 1989-09-07 | 1991-04-18 | Toshiba Corp | Electromagnetic flow meter |
| CN1760643A (en) * | 2005-11-10 | 2006-04-19 | 上海大学 | Parallel type electromagnetic flowmeter with dual excitations |
| CN101900584A (en) * | 2009-05-25 | 2010-12-01 | 哈尔滨理工大学 | Narrow-band filtering micro-flow electromagnetic flowmeter and modulation and demodulation method thereof |
| CN101718565A (en) * | 2009-11-26 | 2010-06-02 | 上海大学 | Double-excitation electromagnetic flow meter based on photoelectrical coupling |
Non-Patent Citations (2)
| Title |
|---|
| 刘铁军，宫通胜: "一种时分双频励磁电磁流量计设计", 《传感技术学报》 * |
| 唐懋官，彭端: "双频智能电磁流量计的研究", 《武汉水利电力大学学报》 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202177647U (en) | Alternating magnetic field resistant manganin diverter | |
| CN103196503B (en) | Flow meter | |
| CN204214486U (en) | The electromagnetic flowmeter that a kind of battery-efficient rate is powered | |
| CN204202662U (en) | A kind of electromagnetic flowmeter based on measuring system | |
| CN204241041U (en) | A kind of magnetic vortex street flowmeter | |
| CN105137370A (en) | Low power consumption miniature fluxgate sensor | |
| CN104266693A (en) | Electromagnetic flow meter measurement system | |
| CN204202661U (en) | A kind of application double excitation formula electromagnetic flowmeter | |
| CN104391176A (en) | Software and hardware frequency measurement circuit compatible with electric power system signals | |
| CN104266692A (en) | Dual-stimulation electromagnetic flowmeter | |
| CN204269715U (en) | A kind of AC current detection device based on Luo-coil | |
| CN204286517U (en) | A kind of dual-frequency excitation electromagnetic flowmeter driving circuit | |
| CN104266696A (en) | High-accuracy intelligent electromagnetic flow meter | |
| CN104280081A (en) | Intelligent large-diameter electromagnetic flowmeter | |
| CN204241047U (en) | A kind of large-diameter electromagnetic flowmeter | |
| CN202133699U (en) | Metal sampling resistor used for current measuring | |
| CN104266694A (en) | Intelligent electromagnetic flowmeter for measuring size | |
| JP2013257276A (en) | Electromagnetic flow meter | |
| CN204241049U (en) | A kind of electromagnetic flowmeter realizing measurement non-full pipe | |
| CN204228214U (en) | A kind of intelligent electric magnetic flowmeter | |
| CN109186692A (en) | The DSP processing method of the Electromagnetic Flow signal of electromagnetic flowmeter | |
| CN210051379U (en) | Insert type electromagnetic flowmeter with magnetic yoke | |
| CN204241050U (en) | Two energized circuit electromagnetic flowmeter | |
| CN104280080A (en) | Grounded electromagnetic flow meter | |
| CN205844511U (en) | A kind of electric energy meter of built-in virtual load |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150107 |
|
| WD01 | Invention patent application deemed withdrawn after publication |