CN104374439A - Conducting liquid flow measuring system - Google Patents
Conducting liquid flow measuring system Download PDFInfo
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- CN104374439A CN104374439A CN201410677766.3A CN201410677766A CN104374439A CN 104374439 A CN104374439 A CN 104374439A CN 201410677766 A CN201410677766 A CN 201410677766A CN 104374439 A CN104374439 A CN 104374439A
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Abstract
The invention discloses a conducting liquid flow measuring system. The conducting liquid flow measuring system comprises a CPU control module, a harmonic generation module, a signal processing module, a communication module, a power supply module, a display module and a data storage module. The CPU control module is a system core control module and is used for calculating the flow and outputting the flow measuring result to the display module and the data storage module. The harmonic generation module is used for generating high-frequency square wave exciting current. According to the conducting liquid flow measuring system, high-frequency square wave excitation is achieved, so that signal interference generated in the flow measuring process is lowered; in addition, a current detection circuit is arranged, so that changes caused by working environment changes due to excitation current are reduced; the conducting liquid flow measuring system is high in measuring precision and can meet the requirement of practical application for measuring the conducting liquid flow.
Description
Technical field
The present invention relates to instrument field, relate in particular to a kind of flow of conductive liquid system for measuring quantity.
Background technology
Electromagnetic flowmeter is the Ferraris instrument being used for conducting medium volumetric flow rate in measuring tube according to Faraday's electromagnetic induction law manufacture.In electromagnetic flowmeter, conducting medium in measuring tube is equivalent to the conducting metal bar in faraday's test, by conducting medium as among magnetic field, when there being conducting medium to flow through, then induced voltage can be produced, by obtaining induced voltage, and carry out signal transacting, then can get the flow of end liquid.
But, when measuring the flow of conductive liquid, output pulsation is very large, error is very large, and one of wherein important reason be have employed low frequency square-wave excitation to produce alternating magnetic field, and adopt the square-wave excitation of high frequency can lower the error of measurement, therefore produce high frequency square wave exciting current very important for flow of conductive liquid system for measuring quantity.
Summary of the invention
The object of the invention is to the shortcoming and defect for above-mentioned prior art, a kind of flow of conductive liquid system for measuring quantity is provided.
For achieving the above object, present invention employs following technical scheme:
A kind of flow of conductive liquid system for measuring quantity, comprises CPU control module, harmonic wave generation module, signal processing module, communication module, supply module, display module and data memory module;
Described CPU control module is system core control module, for calculated flow rate, and exports flow measurement to display module and data memory module;
Described harmonic wave generation module for generation of high frequency square wave exciting current, thus sets up alternating electric field;
Described signal processing module is used for collection signal, disturbs in erasure signal, and after amplifying, exports signal to CPU control module;
Described communication module is used for carrying out data transmission with the external world, and transferring content is the data in data memory module;
Line voltage is converted into operating voltage by described supply module, and powers for measuring system;
Described display module is used for the flow of conductive liquid;
Data memory module is for storing each the flow of conductive liquid measured.
Preferably, described harmonic wave generation module comprises constant-current source circuit, current control circuit and galvanometer circuit; Described constant-current source circuit is for providing constant stable state exciting current; Current control circuit is used for switched energization sense of current, to realize square-wave excitation; Result of variations for detecting the change of exciting current, and is transferred to CPU control module by galvanometer circuit.
Preferably, described galvanometer circuit comprises inspection leakage resistance, operational amplification circuit and low-pass filter circuit.
Preferably, the signal amplification factor of described signal processing module is 5 times.
Preferably, needed for described harmonic wave generation module, power supply is 36V.
Preferably, needed for described CPU control module, power supply is ± 15V.
Compared with prior art, the invention has the beneficial effects as follows:
The present invention adopts constant current source and with higher voltage power supply, realize the square-wave excitation of high frequency, thus the signal disturbing reduced in flow measurement process, be provided with galvanometer circuit again, thus the change reduced because exciting current causes because of working environment change, measuring accuracy of the present invention is higher, can meet the measurement requirement of practical application for the flow of conductive liquid.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below.
Fig. 1 is the flow of conductive liquid system for measuring quantity structured flowchart of the embodiment of the present invention.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, the present invention is described in further detail.
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.
As shown in Figure 1, a kind of flow of conductive liquid system for measuring quantity, comprises CPU control module, harmonic wave generation module, signal processing module, communication module, supply module, display module and data memory module;
Described CPU control module is system core control module, for calculated flow rate, and exports flow measurement to display module and data memory module;
Described harmonic wave generation module for generation of high frequency square wave exciting current, thus sets up alternating electric field;
Described signal processing module is used for collection signal, disturbs in erasure signal, and after amplifying, exports signal to CPU control module;
Described communication module is used for carrying out data transmission with the external world, and transferring content is the data in data memory module;
Line voltage is converted into operating voltage by described supply module, and powers for measuring system;
Described display module is used for the flow of conductive liquid;
Data memory module is for storing each the flow of conductive liquid measured.
Preferably, described harmonic wave generation module comprises constant-current source circuit, current control circuit and galvanometer circuit; Described constant-current source circuit is for providing constant stable state exciting current; Current control circuit is used for switched energization sense of current, to realize square-wave excitation; Result of variations for detecting the change of exciting current, and is transferred to CPU control module by galvanometer circuit.
Preferably, described galvanometer circuit comprises inspection leakage resistance, operational amplification circuit and low-pass filter circuit.
Preferably, the signal amplification factor of described signal processing module is 5 times.
Preferably, needed for described harmonic wave generation module, power supply is 36V.
Preferably, needed for described CPU control module, power supply is ± 15V.
Based on the embodiment in the present invention, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, and any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. a flow of conductive liquid system for measuring quantity, is characterized in that, comprises CPU control module, harmonic wave generation module, signal processing module, communication module, supply module, display module and data memory module;
Described CPU control module is system core control module, for calculated flow rate, and exports flow measurement to display module and data memory module;
Described harmonic wave generation module for generation of high frequency square wave exciting current, thus sets up alternating electric field;
Described signal processing module is used for collection signal, disturbs in erasure signal, and after amplifying, exports signal to CPU control module;
Described communication module is used for carrying out data transmission with the external world, and transferring content is the data in data memory module;
Line voltage is converted into operating voltage by described supply module, and powers for measuring system;
Described display module is used for the flow of conductive liquid;
Data memory module is for storing each the flow of conductive liquid measured.
2. a kind of flow of conductive liquid system for measuring quantity according to claim 1, is characterized in that, described harmonic wave generation module comprises constant-current source circuit, current control circuit and galvanometer circuit; Described constant-current source circuit is for providing constant stable state exciting current; Current control circuit is used for switched energization sense of current, to realize square-wave excitation; Result of variations for detecting the change of exciting current, and is transferred to CPU control module by galvanometer circuit.
3. a kind of flow of conductive liquid system for measuring quantity according to claim 2, is characterized in that, described galvanometer circuit comprises inspection leakage resistance, operational amplification circuit and low-pass filter circuit.
4. a kind of flow of conductive liquid system for measuring quantity according to claim 3, is characterized in that, the signal amplification factor of described signal processing module is 5 times.
5. a kind of flow of conductive liquid system for measuring quantity according to claim 4, is characterized in that, needed for described harmonic wave generation module, power supply is 36V.
6. a kind of flow of conductive liquid system for measuring quantity according to claim 5, is characterized in that, needed for described CPU control module, power supply is ± 15V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410677766.3A CN104374439A (en) | 2014-11-21 | 2014-11-21 | Conducting liquid flow measuring system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410677766.3A CN104374439A (en) | 2014-11-21 | 2014-11-21 | Conducting liquid flow measuring system |
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| CN104374439A true CN104374439A (en) | 2015-02-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410677766.3A Pending CN104374439A (en) | 2014-11-21 | 2014-11-21 | Conducting liquid flow measuring system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105136221A (en) * | 2015-04-30 | 2015-12-09 | 无锡市崇安区科技创业服务中心 | Conductive liquid volume and flow monitoring device |
| CN109489747A (en) * | 2018-12-24 | 2019-03-19 | 合肥工业大学 | A kind of electromagnetic flowmeter signal processing method based on frequency analysis |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10170317A (en) * | 1996-12-10 | 1998-06-26 | Yokogawa Electric Corp | Electromagnetic flowmeter |
| CN101644591A (en) * | 2009-09-08 | 2010-02-10 | 合肥工业大学 | Mono-dual frequency electromagnetic flowmeter excitation control system based on linear power supply |
| CN101893465A (en) * | 2010-06-30 | 2010-11-24 | 合肥工业大学 | DSP-based electromagnetic flowmeter signal processing system |
-
2014
- 2014-11-21 CN CN201410677766.3A patent/CN104374439A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10170317A (en) * | 1996-12-10 | 1998-06-26 | Yokogawa Electric Corp | Electromagnetic flowmeter |
| CN101644591A (en) * | 2009-09-08 | 2010-02-10 | 合肥工业大学 | Mono-dual frequency electromagnetic flowmeter excitation control system based on linear power supply |
| CN101893465A (en) * | 2010-06-30 | 2010-11-24 | 合肥工业大学 | DSP-based electromagnetic flowmeter signal processing system |
Non-Patent Citations (1)
| Title |
|---|
| 杨双龙: "浆液型电磁流量计励磁控制与信号处理研究", 《中国优秀硕士学位论文全文数据库 工程科技II辑》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105136221A (en) * | 2015-04-30 | 2015-12-09 | 无锡市崇安区科技创业服务中心 | Conductive liquid volume and flow monitoring device |
| CN109489747A (en) * | 2018-12-24 | 2019-03-19 | 合肥工业大学 | A kind of electromagnetic flowmeter signal processing method based on frequency analysis |
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Application publication date: 20150225 |