CN101900584A - Narrow-band filtering micro-flow electromagnetic flowmeter and modulation and demodulation method thereof - Google Patents
Narrow-band filtering micro-flow electromagnetic flowmeter and modulation and demodulation method thereof Download PDFInfo
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- CN101900584A CN101900584A CN2010101174816A CN201010117481A CN101900584A CN 101900584 A CN101900584 A CN 101900584A CN 2010101174816 A CN2010101174816 A CN 2010101174816A CN 201010117481 A CN201010117481 A CN 201010117481A CN 101900584 A CN101900584 A CN 101900584A
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Abstract
The invention discloses a narrow-band filtering micro-flow electromagnetic flowmeter and a modulation and demodulation method thereof. An induced electromotive force (flow signal) of the once meter output of the conventional micro-flow electromagnetic flowmeter is a weak signal superposed with a plurality of noise interferences, and a signal to noise ratio is low, so the conventional micro-flow electromagnetic flowmeter has low resolution and low accuracy. The narrow-band filtering micro-flow electromagnetic flowmeter consists of a meter shell, and is characterized in that: a circuit board is arranged in the meter shell, and comprises an input signal conditioning circuit, an excitation drive circuit and a power circuit, wherein the input signal conditioning circuit is connected with an A/D converter which is connected with a microprocessor; the microprocessor is connected with a display and a demodulation control circuit; and the demodulation control circuit is connected with the excitation drive circuit. The narrow-band filtering micro-flow electromagnetic flowmeter and the modulation and demodulation method thereof are applied in fields needing micro-flow measurement, such as industry, medicine and health, bioengineering, fine chemical engineering and the like.
Description
Technical field:
The present invention relates to a kind of novel flow measurement instrument, more precisely, relate to a kind of electromagnetic flowmeter that is used for micro-flow measurement, and use the method for this product modulation-demodulation.
Background technology:
Modern industry is produced, especially it is more and more that industries such as medical and health, bioengineering and fine chemistry industry need the occasion of micro-flow measurement, yet the induction electromotive force (flow signal) that the micrometeor electromagnetic flowmeter once shows to export is the weak signal of multiple noise of superposeing, signal to noise ratio (S/N ratio) is very low, cause the resolution rate variance of micrometeor electromagnetic flowmeter, accuracy is not high.
Summary of the invention:
The purpose of this invention is to provide a kind of micrometeor electromagnetic flowmeter and modulation-demo-demodulation method thereof, use the narrow-band filtering technology, the induction electromotive force of the micrometeor electromagnetic flowmeter once being shown to export, have only the microvolt level, carry out preposition amplification, narrow-band filtering, signal demodulation, obtain the first-harmonic of flow velocity signal, again it is carried out the flow that integrating can be measured fluid, realize the accurate measurement of micrometeor.
Above-mentioned purpose realizes by following technical scheme:
The narrow-band filtering micro-flow electromagnetic flowmeter, its composition comprises: instrument cabinet, in the described instrument cabinet circuit board is housed, comprise input signal conditioning circuit, excitatory driving circuit and power circuit on the described circuit board, described input signal conditioning circuit is connected with A/D converter, described A/D converter is connected with microprocessor, and described microprocessor is connected with display, demodulation control circuit respectively, and described demodulation control circuit is connected with excitatory driving circuit.
Described narrow-band filtering micro-flow electromagnetic flowmeter, described input signal conditioning circuit comprises pre-amplification circuit, narrow-band filtering circuit, signal demodulating circuit and low pass amplifying circuit, has circuit connecting relation between its each ingredient.
Described narrow-band filtering micro-flow electromagnetic flowmeter, described A/D converter is the ICL7135 monolithic double integrator analog to digital converter of American I NTERSIL company, and described microprocessor is the MSP430 single-chip microcomputer or the Dutch PHILIPS 80C552 of the company single-chip microcomputer of Hong Kong TI company.
Described narrow-band filtering micro-flow electromagnetic flowmeter, described excitatory driving circuit are the directions of the switching exciting curent that is made of 4 power transistors, produce the circuit of the required alternating magnetic field of micrometeor electromagnetic flowmeter.
The modulation-demo-demodulation method of narrow-band filtering micro-flow electromagnetic flowmeter:
A. the induction electromotive force of exporting between micrometeor electromagnetic flowmeter detecting electrode;
B. separate mediation low pass amplifying circuit through preposition amplification, narrow-band filtering, signal, obtain flow velocity signal;
C. the A/D circuit conversion of making a gift to someone then is a digital quantity, is connected to that microprocessor is handled and integrating again, obtains fluid velocity (meter per second), instantaneous delivery (cubic meter/hour), integrated flow (cubic meter) fluid parameter;
D. the form with program code is sent to display circuit, carries out Hanzify by the graphic lcd display screen and shows;
E. by the functional unit and the software program of microprocessor internal, produce the pulse signal that the control exciting curent changes direction and the pulse signal of control signal demodulator circuit work, the magnetizing coil that drives the micrometeor electromagnetic flowmeter produces alternating magnetic field;
And then realization is to the modulation-demodulation of flow signal.
Beneficial effect:
1, the present invention adopts the narrow-band filtering technology, and filtering micrometeor electromagnetic flowmeter is once shown the higher hamonic wave of the induction electromotive force exported, reduces the influence of interference noise, improves the signal to noise ratio (S/N ratio) of flow velocity signal, can make the measurement lower limit of micrometeor electromagnetic flowmeter reach 0.002m
3/ h (flow velocity 0.026m/s) realizes the accurate measurement of micrometeor.
2, microprocessor of the present invention is to adopt high-performance single-chip microcomputer MSP430, for system provides hardware carrier, and embedding control, management and data processing software, realize the integrating, multi-segment nonlinear correction of generation, the flow velocity signal of demodulating control signals etc., further improve the performance index of micrometeor electromagnetic flowmeter.
3, A/D converter of the present invention has adopted 41/2 double integrator digital to analog converter of ICL7135 monolithic, improves anti-power frequency interference capability, guarantees flow velocity signal is carried out the accuracy and the stability of analog/digital conversion.
4, the present invention adopts the functional unit and the software program of microprocessor internal, produces the pulse signal of control signal demodulator circuit work, makes the hardware configuration of instrument simple and direct, and reliability improves.
5, the present invention adopts power transistor to constitute excitatory driving circuit, under the control of microprocessor, and the direction of conversion exciting curent exactly, the magnetizing coil that drives the micrometeor electromagnetic flowmeter produces needed alternating magnetic field.
6, display of the present invention adopts the graphic lcd display screen of built-in Chinese character base, and the Hanzify man-machine interface that writing is clear, contain much information is provided.
7, the present invention has introduced intelligentized design, and is simple to operate, makes things convenient for the verification of instrument and user's use.
Purpose of the present invention, feature and advantage will be in conjunction with the embodiments, are described further with reference to accompanying drawing.
Description of drawings:
Accompanying drawing 1 is a hardware connection diagram of the present invention.
Accompanying drawing 2 is input signal conditioning circuit block diagrams of the present invention.
Accompanying drawing 3 is A/D change-over circuit schematic diagrams of the present invention.
Accompanying drawing 5 is excitatory driving circuit schematic diagrams of the present invention.
Accompanying drawing 6 is a kind of instrument structure synoptic diagram of the present invention.
Accompanying drawing 7 is mainboard connection layout.
Regulation according to electronic circuit is drawn has annexation between the circuit between the same numeral.
Embodiment:
Embodiment 1:
With reference to accompanying drawing, be described in detail the preferred specific embodiment of the present invention.
In accompanying drawing 1, the narrow-band filtering micro-flow electromagnetic flowmeter, its composition comprises: instrument cabinet 1, in the described instrument cabinet circuit board is housed, comprise input signal conditioning circuit 2, excitatory driving circuit 6 and power circuit 7 on the described circuit board, described input signal conditioning circuit is connected with A/D converter 3, described A/D converter is connected with microprocessor 5, described microprocessor is connected with display 8, demodulation control circuit 5 respectively, and described demodulation control circuit is connected with excitatory driving circuit 6.
Embodiment 2:
Narrow-band filtering micro-flow electromagnetic flowmeter among the embodiment 1, described input signal conditioning circuit comprises: pre-amplification circuit, narrow-band filtering circuit, signal demodulating circuit and low pass amplifying circuit connect as Fig. 2 between its each ingredient.Have the circuit of same numeral between each device, have annexation.
Described narrow-band filtering micro-flow electromagnetic flowmeter, described A/D converter can adopt the ICL7135 monolithic double integrator analog to digital converter of American I NTERSIL company, perhaps adopt other alternative devices.
Described narrow-band filtering micro-flow electromagnetic flowmeter, described microprocessor can adopt the MSP430 single-chip microcomputer of Hong Kong TI company, perhaps adopt other alternative devices.
Described narrow-band filtering micro-flow electromagnetic flowmeter, described demodulation control circuit adopt the functional unit and the software program of microprocessor internal to realize.
Described narrow-band filtering micro-flow electromagnetic flowmeter, described excitatory driving circuit can be the circuit that is made of 4 power transistors, is used for switching the direction of exciting curent, produces the required alternating magnetic field of micrometeor electromagnetic flowmeter.
Described narrow-band filtering micro-flow electromagnetic flowmeter, described display can adopt the graphic lcd display screen of built-in Chinese character base.
Embodiment 3:
The induction electromotive force of exporting between micrometeor electromagnetic flowmeter detecting electrode (flow signal), separate mediation low pass amplifying circuit through preposition amplification, narrow-band filtering, signal, obtain flow velocity signal, the A/D circuit conversion of making a gift to someone then is a digital quantity, be connected to again that microprocessor is handled and integrating, obtain fluid velocity (meter per second), instantaneous delivery (cubic metre/hour), integrated flow fluid parameters such as (cubic meters), and be sent to display circuit with the form of program code, carry out Hanzify by the graphic lcd display screen and show.While is by the functional unit and the software program of microprocessor internal, the pulse signal that generation control exciting curent is changed direction and the pulse signal of control signal demodulator circuit work, the magnetizing coil that drives the micrometeor electromagnetic flowmeter produces alternating magnetic field, and then realizes the modulation-demodulation to flow signal.
Claims (5)
1. narrow-band filtering micro-flow electromagnetic flowmeter, its composition comprises: instrument cabinet, it is characterized in that: in the described instrument cabinet circuit board is housed, comprise input signal conditioning circuit, excitatory driving circuit and power circuit on the described circuit board, described input signal conditioning circuit is connected with A/D converter, described A/D converter is connected with microprocessor, and described microprocessor is connected with display, demodulation control circuit respectively, and described demodulation control circuit is connected with excitatory driving circuit.
2. narrow-band filtering micro-flow electromagnetic flowmeter according to claim 1, it is characterized in that: described input signal conditioning circuit comprises pre-amplification circuit, narrow-band filtering circuit, signal demodulating circuit and low pass amplifying circuit, has circuit connecting relation between its each ingredient.
3. narrow-band filtering micro-flow electromagnetic flowmeter according to claim 1 and 2, it is characterized in that: described A/D converter is the ICL7135 monolithic double integrator analog to digital converter of American I NTERSIL company, and described microprocessor is the MSP430 single-chip microcomputer or the Dutch PHILIPS 80C552 of the company single-chip microcomputer of Hong Kong TI company.
4. narrow-band filtering micro-flow electromagnetic flowmeter according to claim 1 and 2, it is characterized in that: described excitatory driving circuit is the direction of the switching exciting curent that is made of 4 power transistors, produces the circuit of the required alternating magnetic field of micrometeor electromagnetic flowmeter.
5. the modulation-demo-demodulation method of a narrow-band filtering micro-flow electromagnetic flowmeter is characterized in that:
A. the induction electromotive force of exporting between micrometeor electromagnetic flowmeter detecting electrode;
B. separate mediation low pass amplifying circuit through preposition amplification, narrow-band filtering, signal, obtain flow velocity signal;
C. the A/D circuit conversion of making a gift to someone then is a digital quantity, is connected to that microprocessor is handled and integrating again, obtains fluid velocity (meter per second), instantaneous delivery (cubic meter/hour), integrated flow (cubic meter) fluid parameter;
D. the form with program code is sent to display circuit, carries out Hanzify by the graphic lcd display screen and shows;
E. by the functional unit and the software program of microprocessor internal, produce the pulse signal that the control exciting curent changes direction and the pulse signal of control signal demodulator circuit work, the magnetizing coil that drives the micrometeor electromagnetic flowmeter produces alternating magnetic field;
And then realization is to the modulation-demodulation of flow signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101174816A CN101900584A (en) | 2009-05-25 | 2010-02-02 | Narrow-band filtering micro-flow electromagnetic flowmeter and modulation and demodulation method thereof |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910072122 | 2009-05-25 | ||
| CN200910072122.0 | 2009-05-25 | ||
| CN2010101174816A CN101900584A (en) | 2009-05-25 | 2010-02-02 | Narrow-band filtering micro-flow electromagnetic flowmeter and modulation and demodulation method thereof |
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| Publication Number | Publication Date |
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| CN101900584A true CN101900584A (en) | 2010-12-01 |
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| CN2010101174816A Pending CN101900584A (en) | 2009-05-25 | 2010-02-02 | Narrow-band filtering micro-flow electromagnetic flowmeter and modulation and demodulation method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104266692A (en) * | 2014-10-21 | 2015-01-07 | 中山欧麦克仪器设备有限公司 | Dual-stimulation electromagnetic flowmeter |
| CN104266698A (en) * | 2014-10-22 | 2015-01-07 | 中山欧麦克仪器设备有限公司 | Intelligent electromagnetic micrometer |
| CN104266693A (en) * | 2014-10-21 | 2015-01-07 | 中山欧麦克仪器设备有限公司 | Electromagnetic flow meter measurement system |
-
2010
- 2010-02-02 CN CN2010101174816A patent/CN101900584A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104266692A (en) * | 2014-10-21 | 2015-01-07 | 中山欧麦克仪器设备有限公司 | Dual-stimulation electromagnetic flowmeter |
| CN104266693A (en) * | 2014-10-21 | 2015-01-07 | 中山欧麦克仪器设备有限公司 | Electromagnetic flow meter measurement system |
| CN104266698A (en) * | 2014-10-22 | 2015-01-07 | 中山欧麦克仪器设备有限公司 | Intelligent electromagnetic micrometer |
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Open date: 20101201 |