CN104266693A - Electromagnetic flow meter measurement system - Google Patents
Electromagnetic flow meter measurement system Download PDFInfo
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- CN104266693A CN104266693A CN201410561331.2A CN201410561331A CN104266693A CN 104266693 A CN104266693 A CN 104266693A CN 201410561331 A CN201410561331 A CN 201410561331A CN 104266693 A CN104266693 A CN 104266693A
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Abstract
The invention discloses an electromagnetic flow meter measurement system. The electromagnetic flow meter measurement system comprises an excitation coil, an excitation device, an electrode, a signal processing circuit, an A/D (Analog to Digital) converter, a flow value computing device and a flow value output device. According to the electromagnetic flow meter measurement system, the rectangular excitation current is provided for the excitation coil by at least two excitation cycles of the excitation device, the selective conversion is performed on a plurality of excitation cycles, and accordingly a plurality of excitation frequency of initial flow signals can be obtained, the measurement error caused by the induction noise can be effectively eliminated, the zero adjustment which result in the fluid flowing is not performed, the measurement accuracy is improved, and the reliability is high.
Description
Technical field
The present invention relates to a kind of electromagnetic flowmeter survey system.
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 have 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 measuring system is difficult to the measuring error eliminated because induced noise causes, reliability is low.
Summary of the invention
In order to overcome the deficiencies in the prior art, the invention provides a kind of electromagnetic flowmeter survey system.
The technical solution adopted for the present invention to solve the technical problems is:
Electromagnetic flowmeter survey system, 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 rectangle exciting curent with the excitation cycle of at least two 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;
Flow value calculation element, this flow value calculation element 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, to obtain the flow value signal that will obtain when described excitation cycle is infinity;
Flow value output unit, this flow value output unit and flow value calculation element, be used for exporting the described flow value signal obtained by means of described flow value calculation element by extrapolation method.
Described flow value calculation element carries out extrapolation computing according to the linear function of excitation cycle.
Described rectangle exciting curent is selectivity conversion in three excitation cycles, and wherein said flow value calculation element obtains flow value signal from the flow signal of described three excitation cycles.
Described signal processing circuit comprises amplifying circuit, filtering circuit, and signal exports successively after amplifying circuit, filtering circuit.
Described flow value calculation element is a microprocessor.
Described flow value output unit is a display.
The invention has the beneficial effects as follows: the excitation cycle of magnetizer of the present invention at least two provides rectangle exciting curent to described magnetizing coil, and multiple excitation cycle selectivity is changed, the initial flow signal of multiple magnet excitation frequency can be obtained, effectively can eliminate the measuring error because induced noise causes, and the zero point of not carrying out causing the flowing of stopping fluid adjusting and improves 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, electromagnetic flowmeter survey system, 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 rectangle exciting curent with the excitation cycle of at least two 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;
Flow value calculation element, this flow value calculation element 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, to obtain the flow value signal that will obtain when described excitation cycle is infinity;
Flow value output unit, this flow value output unit and flow value calculation element, be used for exporting the described flow value signal obtained by means of described flow value calculation element by extrapolation method.
As preferably, described rectangle exciting curent is selectivity conversion in three excitation cycles, wherein said flow value calculation element obtains flow value signal from the flow signal of described three excitation cycles, flow value calculation element carries out extrapolation computing according to the linear function of excitation cycle, due to the initial flow signal of three magnet excitation frequencies can be obtained, effectively can eliminate the measuring error because induced noise causes, and the zero point of not carrying out causing the flowing of stopping fluid adjusting and improves 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 flow value calculation element is a microprocessor, and described flow value output unit is a display, and described microprocessor is preferably the MSP430 single-chip microcomputer of Hong Kong TI company or Dutch PHILIPS company 80C552 single-chip microcomputer.
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 (6)
1. electromagnetic flowmeter survey system, 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 rectangle exciting curent with the excitation cycle of at least two 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;
Flow value calculation element, this flow value calculation element 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, to obtain the flow value signal that will obtain when described excitation cycle is infinity;
Flow value output unit, this flow value output unit and flow value calculation element, be used for exporting the described flow value signal obtained by means of described flow value calculation element by extrapolation method.
2. electromagnetic flowmeter survey system according to claim 1, is characterized in that: described flow value calculation element carries out extrapolation computing according to the linear function of excitation cycle.
3. electromagnetic flowmeter survey system according to claim 1, it is characterized in that: described rectangle exciting curent is selectivity conversion in three excitation cycles, and wherein said flow value calculation element obtains flow value signal from the flow signal of described three excitation cycles.
4. electromagnetic flowmeter survey system according to claim 1, it is characterized in that: described signal processing circuit comprises amplifying circuit, filtering circuit, signal exports successively after amplifying circuit, filtering circuit.
5. electromagnetic flowmeter survey system according to claim 1, is characterized in that: described flow value calculation element is a microprocessor.
6. electromagnetic flowmeter survey system according to claim 1, is characterized in that: described flow value output unit is a display.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410561331.2A CN104266693A (en) | 2014-10-21 | 2014-10-21 | Electromagnetic flow meter measurement system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410561331.2A CN104266693A (en) | 2014-10-21 | 2014-10-21 | Electromagnetic flow meter measurement system |
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| Publication Number | Publication Date |
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| CN104266693A true CN104266693A (en) | 2015-01-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410561331.2A Pending CN104266693A (en) | 2014-10-21 | 2014-10-21 | Electromagnetic flow meter measurement system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113075420A (en) * | 2021-03-30 | 2021-07-06 | 河南九域恩湃电力技术有限公司 | Digital signal processing method and application thereof in flow velocity measurement |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11223539A (en) * | 1998-02-06 | 1999-08-17 | Yamatake Corp | Electromagnetic flowmeter |
| 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 |
| CN102288234A (en) * | 2010-04-27 | 2011-12-21 | 株式会社山武 | Electromagnetic flow meter |
| CN202903252U (en) * | 2012-10-16 | 2013-04-24 | 杭州振华仪表有限公司 | Internet of things intelligent electromagnetic flow meter |
| CN203053496U (en) * | 2012-12-17 | 2013-07-10 | 福建澳泰自动化设备有限公司 | Electromagnetic flowmeter with trade settlement function |
| CN204202662U (en) * | 2014-10-22 | 2015-03-11 | 中山欧麦克仪器设备有限公司 | A kind of electromagnetic flowmeter based on measuring system |
-
2014
- 2014-10-21 CN CN201410561331.2A patent/CN104266693A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11223539A (en) * | 1998-02-06 | 1999-08-17 | Yamatake Corp | Electromagnetic flowmeter |
| 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 |
| CN102288234A (en) * | 2010-04-27 | 2011-12-21 | 株式会社山武 | Electromagnetic flow meter |
| CN202903252U (en) * | 2012-10-16 | 2013-04-24 | 杭州振华仪表有限公司 | Internet of things intelligent electromagnetic flow meter |
| CN203053496U (en) * | 2012-12-17 | 2013-07-10 | 福建澳泰自动化设备有限公司 | Electromagnetic flowmeter with trade settlement function |
| CN204202662U (en) * | 2014-10-22 | 2015-03-11 | 中山欧麦克仪器设备有限公司 | A kind of electromagnetic flowmeter based on measuring system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113075420A (en) * | 2021-03-30 | 2021-07-06 | 河南九域恩湃电力技术有限公司 | Digital signal processing method and application thereof in flow velocity measurement |
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Application publication date: 20150107 |