CN114527334B - A device for measuring magnetic field strength based on potential difference method - Google Patents
A device for measuring magnetic field strength based on potential difference method Download PDFInfo
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- CN114527334B CN114527334B CN202111664188.6A CN202111664188A CN114527334B CN 114527334 B CN114527334 B CN 114527334B CN 202111664188 A CN202111664188 A CN 202111664188A CN 114527334 B CN114527334 B CN 114527334B
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- 238000000034 method Methods 0.000 title claims abstract description 26
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 70
- 238000005260 corrosion Methods 0.000 claims abstract description 6
- 230000007797 corrosion Effects 0.000 claims abstract description 6
- 239000002184 metal Substances 0.000 claims description 7
- 229910052751 metal Inorganic materials 0.000 claims description 7
- 238000005259 measurement Methods 0.000 claims description 6
- 239000000243 solution Substances 0.000 description 12
- 230000000694 effects Effects 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 238000005530 etching Methods 0.000 description 5
- 230000001590 oxidative effect Effects 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 3
- 239000007800 oxidant agent Substances 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 2
- 238000003487 electrochemical reaction Methods 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 229910021653 sulphate ion Inorganic materials 0.000 description 2
- 230000005355 Hall effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011088 calibration curve Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000840 electrochemical analysis Methods 0.000 description 1
- 238000003411 electrode reaction Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000001646 magnetic resonance method Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- XOFYZVNMUHMLCC-ZPOLXVRWSA-N prednisone Chemical compound O=C1C=C[C@]2(C)[C@H]3C(=O)C[C@](C)([C@@](CC4)(O)C(=O)CO)[C@@H]4[C@@H]3CCC2=C1 XOFYZVNMUHMLCC-ZPOLXVRWSA-N 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/08—Measuring electromagnetic field characteristics
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
Abstract
本发明公开了一种基于电位差法测定磁场强度的装置，包括电脑、电化学工作站、电磁铁控制柜、万用表、电解槽、第一线圈、第二线圈、第一铁芯、第二铁芯；电脑与电化学工作站连接，电解槽中放置有腐蚀溶液、工作电极和参比电极，电解槽放置于第一铁芯、第二铁芯中间，工作电极和参比电极的表面平行且相对，工作电极位于第一铁芯、第二铁芯正中间，参比电极位于第一铁芯、第二铁芯圆周以外，第一铁芯和第二铁芯横截面垂直工作电极表面。通过检测工作电极和参比电极之间的电位差可简便快捷得到所施加磁场的强度。本发明装置结构简单，利用该装置测定磁场强度精度高，具有广阔的应用前景。
The invention discloses a device for measuring magnetic field strength based on a potential difference method, comprising a computer, an electrochemical workstation, an electromagnet control cabinet, a multimeter, an electrolytic cell, a first coil, a second coil, a first iron core, and a second iron core; the computer is connected to the electrochemical workstation, a corrosion solution, a working electrode, and a reference electrode are placed in the electrolytic cell, the electrolytic cell is placed between the first iron core and the second iron core, the surfaces of the working electrode and the reference electrode are parallel and opposite, the working electrode is located in the middle of the first iron core and the second iron core, the reference electrode is located outside the circumference of the first iron core and the second iron core, and the cross section of the first iron core and the second iron core is perpendicular to the surface of the working electrode. By detecting the potential difference between the working electrode and the reference electrode, the strength of the applied magnetic field can be obtained simply and quickly. The device of the invention has a simple structure, and the magnetic field strength can be measured with high precision using the device, and has broad application prospects.
Description
Technical Field
The invention belongs to the technical field of magnetic field intensity measurement, and particularly relates to a device for measuring magnetic field intensity based on a potential difference method.
Background
The role of magnetic fields is reflected in many aspects of natural science and engineering applications. There are many methods for testing magnetic fields, such as fluxgate method, hall effect method, magneto-resistance effect method, magnetic resonance method, superconducting effect method, magneto-optical effect method, etc., which are based on physical effects and require relatively specialized equipment and instruments, and are difficult or inconvenient to test by using general instruments.
The invention provides a method for measuring the magnetic field strength based on a magneto-electric chemistry principle and potential parameters through influencing action rules and selective effects of electrochemical reaction on a magnetic field. The working principle of the invention is based on magneto-electric chemistry theory that the magnetic field influences the surface electrode reaction rate of specific metal in ionic oxidant solution through the superposition of Lorentz force effect, so that the electrochemical state of the metal such as electrode potential is changed, the same metal is selected as a working electrode and a reference electrode to be placed in the same electrolytic cell to form a set of device, an electrochemical workstation or a voltmeter is provided, the potential difference between the potential of the working electrode in the magnetic field and the reference electrode without the magnetic field is tested, the relationship between the potential difference and the magnetic field strength can be calibrated, and the invention can be used for measuring the magnetic field strength by measuring the potential difference of the same metal double-electrode system under the magnetic field with unknown strength.
Disclosure of Invention
In order to solve the problems of the prior art and practicality, the invention aims to develop a device for measuring the magnetic field strength based on a potential difference method, and a calibration curve is obtained by measuring the potential difference of the same metal electrode in a charged oxidant under the existence or non-existence of a magnetic field caused by an external magnetic field, so as to be used for measuring the unknown magnetic field strength. The original points of the invention mainly comprise 3 points, namely 1) a magnetic field strength testing principle based on the Lorentz force effect of a magnetic field on the solid-solution electrochemical reaction, 2) a method for converting magnetic field strength measurement into potential parameter measurement through an electrochemical system, and 3) a measurement device which is assembled by adopting common components and does not need a special reference electrode, thereby having potential application and popularization;
4) The two same electrodes are tested, so that the influence of external interference is eliminated, and the test sensitivity and accuracy are improved.
In order to achieve the above purpose, the invention adopts the following technical scheme:
The device comprises a computer, an electrochemical workstation, an electromagnet control cabinet, a multimeter, an electrolytic tank, a first coil, a second coil, a first iron core and a second iron core, wherein the computer is connected with the electrochemical workstation, the electrolytic tank comprises an etching solution, a working electrode and a reference electrode, the electrolytic tank is placed between the first iron core and the second iron core, the working electrode and the reference electrode are soaked in the etching solution, the surfaces of the working electrode and the reference electrode are parallel and opposite, the working electrode is positioned between the first iron core and the second iron core, the reference electrode is positioned outside the circumferences of the first iron core and the second iron core, the cross sections of the first iron core and the second iron core are perpendicular to the surfaces of the working electrode, the working electrode and the reference electrode are respectively connected with the electrochemical workstation and the multimeter, and the electromagnet control cabinet is connected with the first coil and the second coil.
The device for measuring the magnetic field strength based on the potential difference method is characterized in that the electrolytic tank is a rectangular electrolytic tank, and the thickness of the electrolytic tank is smaller than the distance between the first iron core and the second iron core.
According to the device for measuring the magnetic field intensity based on the potential difference method, the electromagnet control cabinet controls the magnetic field intensity generated by the first coil and the second coil by controlling the magnitude of input current.
The device for measuring the magnetic field intensity based on the potential difference method adopts two identical metal electrodes, one is used as a working electrode, the area of the working electrode is smaller than or equal to 1cm 2, the other is used as a reference electrode, the working electrode is placed in a rectangular electrolytic tank after surface treatment to form a double-electrode system, wherein the working electrode is placed in the middle of a magnetic field, the reference electrode is far away from the magnetic field, the working electrode and the reference electrode need to keep a certain distance, the working electrode is placed in the center of two poles of a magnet to have a magnetic field with certain intensity, and the magnetic field intensity of the position of the reference electrode is almost negligible compared with that of the working electrode. The working electrode and the reference electrode are on the same horizontal line.
The working electrode and the reference electrode of the double electrode system are immersed in a solution containing oxidant ions, and the potential difference between the two electrodes is continuously monitored and tested by an electrochemical workstation or a multimeter, and is close to 0 in the absence of a magnetic field.
And (3) moving the working electrode in the double-electrode system with the potential difference close to 0 to the middle of the first iron core and the second iron core with the calibrated strength, wherein the distances from the center of the working electrode to the first iron core and the second iron core are equal. In the open circuit potential measurement process, the working electrode and the reference electrode are in a static state. And measuring the open-circuit potential difference, continuously measuring the open-circuit potential difference between the working electrode and the reference electrode under the non-magnetic field condition under different magnetic field intensities, wherein the magnetic field intensity is 0.02-0.5T, the magnetic field intensity is gradually applied from small to large, and the potential difference value under each magnetic field condition is stable. According to the electrode potential values of the working electrode under different magnetic field intensities and the reference electrode under 0T, which are measured by an electrochemical workstation, after reaching a steady state, the obtained potential difference variation amplitude under each magnetic field intensity is not more than 10%, and a potential difference delta E (X axis) -magnetic field intensity B (Y axis) standard curve under the magnetic field is drawn.
The same electrode system is placed in a magnetic field with unknown magnetic field strength to measure the difference between the working electrode and the reference electrode at 0T, and corresponding magnetic field strength values are obtained through a drawn standard curve, wherein the deviation degree of the magnetic field strength corresponding to each potential difference is less than or equal to 10%.
Compared with the prior art, the invention has the following beneficial effects:
The invention provides a device for measuring the magnetic field strength, which is used for measuring the magnetic field strength based on the magneto-electricity chemistry principle and the potential parameter, does not need professional equipment and instruments, and is simple, convenient and quick. The device has simple structure, is simple, convenient and easy to operate, has high accuracy for measuring the magnetic field intensity by using the device, and has wide application prospect.
Drawings
FIG. 1 (a) is a schematic diagram of the apparatus for measuring magnetic field strength based on the potential difference method according to the present invention. FIG. 1 (b) is a side view of an electrolyzer for measuring magnetic field strength based on the potential difference method of the present invention, showing the positional relationship between the working electrode and the core and the connection to the electrochemical workstation and multimeter.
1A, 1 part of a computer, 2 parts of an electrochemical workstation, 3 parts of an electromagnet control cabinet, 4 parts of a universal meter, 5 parts of an electrolytic cell, 6-1 parts of a first coil, 6-2 parts of a second coil, 7-1 parts of a second iron core and 7-2 parts of a second iron core.
FIG. 1b is a schematic illustration of an electrochemical workstation, 4 a multimeter, 5 an electrolyzer, 7-1 a first core, 7-2 a second core, 8 a corrosion solution, 9 a working electrode, 10 a reference electrode.
Fig. 2 is a graph of the magnetic field strength measured using the device.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example a plot of applied magnetic field strength was measured by measuring the difference in potential of two pure iron electrodes in a 0.12mol/L ferric sulphate solution.
The device disclosed by the invention is shown in figure 1, and comprises a computer 1, an electrochemical workstation 2, an electromagnet control cabinet 3, a universal meter 4, an electrolytic tank 5, a first coil 6-1, a second coil 6-2, a first iron core 7-1 and a second iron core 7-2, wherein the computer 1 is connected with the electrochemical workstation 2, the electrolytic tank 5 comprises an etching solution 8, a working electrode 9 and a reference electrode 10, the electrolytic tank is placed in the middle of the first iron core 7-1 and the second iron core 7-2, the working electrode 9 and the reference electrode 10 are immersed in the etching solution 8, the surfaces of the working electrode 9 and the reference electrode 10 are parallel and opposite, the working electrode 9 is positioned in the middle of the first iron core 7-1 and the second iron core 7-2, the reference electrode 10 is positioned outside the circumferences of the first iron core 7-1 and the second iron core 7-2, the cross sections of the first iron core 7-1 and the second iron core 7-2 are perpendicular to the surfaces of the working electrode 9, the working electrode 9 and the reference electrode 10 are respectively connected with the electrochemical workstations 2 and 4, and the electromagnet control cabinet 3 is connected with the first coil 6-1 and the second coil 6-2. The electrolytic tank 5 is a rectangular electrolytic tank, and the thickness of the electrolytic tank is smaller than the distance between the first iron core 7-1 and the second iron core 7-2. The electromagnet control cabinet 3 controls the intensity of the magnetic field generated by the first coil 6-1 and the second coil 6-2 by controlling the magnitude of the input current. Two identical iron electrodes are adopted, one is used as a working electrode 9, the other is used as a reference electrode 10, the two electrodes are polished and placed into a rectangular electrolytic tank 5, the size of the electrolytic tank in the thickness direction is required to be suitable for being placed between a first iron core 7-1 and a second iron core 7-2, a double-electrode system is formed, wherein the working electrode 9 and the reference electrode 10 are required to keep a certain distance, the working electrode 9 can be placed between the first iron core 7-1 and the second iron core 7-2 and has a magnetic field with a certain strength, and the reference electrode 10 is far away from the middle of the first iron core 7-1 and the second iron core 7-2 and has a negligible magnetic field strength compared with the position of the working electrode 9. The double-electrode system is communicated with an electrochemical workstation (2) or a voltmeter (4) to form an electrochemical test system. The working electrode 9 and the reference electrode 10 of the two-electrode system are immersed in an oxidizing ion-containing etching solution 8, and the potential difference between the two electrodes is continuously monitored and tested with the electrochemical workstation 2 or the multimeter 4, the potential difference being close to 0 in the absence of a magnetic field. Meanwhile, the working electrode 9 in the double-electrode system with the potential difference close to 0 is moved to the middle of the first iron core 7-1 and the second iron core 7-2 with the calibrated strength, the reference electrode 10 is far away from the magnetic field, and the open-circuit potential difference between the working electrode 9 under the magnetic field and the reference electrode 10 under the non-magnetic field is measured. According to the open circuit potential values of the working electrode 9 under different magnetic field intensities and the reference electrode 10 under no magnetic field, which are measured in the corrosion solution 8, after reaching a steady state, an open circuit potential difference (X axis) -magnetic field intensity (Y axis) standard curve under the magnetic field is drawn. The difference of the open circuit potential between the working electrode 9 and the reference electrode 10 under no magnetic field is measured by placing the same electrode system in the magnetic field with unknown magnetic field strength, and the corresponding magnetic field strength value can be obtained through the standard curve drawn above.
With the device of the invention, a test was carried out for iron in a 0.12mol/L ferric sulphate solution, the test results of which are described below:
When no magnetic field exists at the working electrode, the potential difference between the working electrode and the reference electrode is close to 0. When magnetic fields of 0.02T, 0.05T, 0.1T, 0.2T, 0.3T, 0.4T and 0.5T are respectively applied to the working electrode, the potential difference between the working electrode and the reference electrode is respectively 0.35mV, 3.07mV, 7.29mV, 10.93mV, 13.27mV, 14.87mV and 16.12mV, and a potential difference (X-axis) -magnetic field intensity (Y-axis) curve between the working electrode and the reference electrode is drawn. The experiment was repeated three times under the same conditions, and the maximum value of the fluctuation of the potential difference obtained under the condition of applying a magnetic field of 0.5T was 0.93mV, and the variation amplitude was 5.6%. The resulting potential difference (X-axis) -magnetic field strength (Y-axis) curve between the working electrode and the reference electrode was fitted, and when the potential difference was 5.6%, the corresponding tested magnetic field strength was 9.6%. Thus, under this system, when the working electrode is in an unknown magnetic field, if the potential difference between the working electrode and the reference electrode is measured to be 0.35mV, it can be judged that the working electrode is in a magnetic field of 0.02T at this time, and if the potential difference between the working electrode and the reference electrode is measured to be 3.07mV, 7.29mV, 10.93mV, 13.27mV, 14.87mV, 16.12mV, it can be judged that the working electrode is in a magnetic field of 0.05T, 0.1T, 0.2T, 0.3T, 0.4T, 0.5T at this time. As shown in fig. 2.
Claims (6)
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102187182A (en) * | 2008-10-13 | 2011-09-14 | 恩德斯+豪斯流量技术股份有限公司 | Method for the energy-saving operation of a magnetic-inductive flow meter |
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| US6865956B2 (en) * | 2001-09-20 | 2005-03-15 | Yamatake Corporation | Electromagnetic flowmeter |
| WO2005090639A2 (en) * | 2004-03-17 | 2005-09-29 | Kennecott Utah Copper Corporation | Monitoring electrolytic cell currents |
| EP2393963B1 (en) * | 2009-02-04 | 2019-01-16 | Siemens Aktiengesellschaft | Electromagnetic flowmeter having corrosion protection of measuring electrodes, and method incorporating the same |
| DE102016211577A1 (en) * | 2016-06-28 | 2017-12-28 | Siemens Aktiengesellschaft | Magnetic-inductive flowmeter |
| JP6806133B2 (en) * | 2018-12-28 | 2021-01-06 | Tdk株式会社 | Magnetic sensor device |
| DE102020114517A1 (en) * | 2020-05-29 | 2021-12-02 | Endress+Hauser Flowtec Ag | Electromagnetic flow measuring device |
| DE102020114515A1 (en) * | 2020-05-29 | 2021-12-02 | Endress+Hauser Flowtec Ag | Electromagnetic flow measuring device |
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| CN102187182A (en) * | 2008-10-13 | 2011-09-14 | 恩德斯+豪斯流量技术股份有限公司 | Method for the energy-saving operation of a magnetic-inductive flow meter |
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