CN110346627A - Weak current detection device - Google Patents
Weak current detection device Download PDFInfo
- Publication number
- CN110346627A CN110346627A CN201910262219.1A CN201910262219A CN110346627A CN 110346627 A CN110346627 A CN 110346627A CN 201910262219 A CN201910262219 A CN 201910262219A CN 110346627 A CN110346627 A CN 110346627A
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- CN
- China
- Prior art keywords
- detection device
- weak current
- magnetic sensor
- current detection
- leakage current
- 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.)
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Links
- 238000001514 detection method Methods 0.000 title claims abstract description 30
- 239000000758 substrate Substances 0.000 claims description 5
- 230000035945 sensitivity Effects 0.000 abstract description 11
- 230000005283 ground state Effects 0.000 description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 8
- 229910003460 diamond Inorganic materials 0.000 description 4
- 239000010432 diamond Substances 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 238000007689 inspection Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 229940074200 diamode Drugs 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- PGYPOBZJRVSMDS-UHFFFAOYSA-N loperamide hydrochloride Chemical compound Cl.C=1C=CC=CC=1C(C=1C=CC=CC=1)(C(=O)N(C)C)CCN(CC1)CCC1(O)C1=CC=C(Cl)C=C1 PGYPOBZJRVSMDS-UHFFFAOYSA-N 0.000 description 1
- 125000004433 nitrogen atom Chemical group N* 0.000 description 1
- 238000000387 optically detected magnetic resonance Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/20—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Magnetic Variables (AREA)
- Measurement Of Current Or Voltage (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
The present invention solves following project: existing Magnetic Sensor is since there are the limit of sensitivity, and for the leakage current of Weak current, such as nA rank, there is undetectable problems.In addition, generating widely distributed magnetic field between the electrodes by the alternating current applied, as a result, field variation caused by leakage current cannot be clearly seen that in existing detection method.The present invention provides a kind of Weak current detection device, has: the Magnetic Sensor containing NVC and vector potential device, can detect small leakage current again and can be improved the sensitivity as Magnetic Sensor.
Description
Technical field
The present invention relates to a kind of Weak current detection devices.
Background technique
In recent years, for contain nitrogen vacancy centre (NVC:Nitrogen Vacancy Center) structure,
Application on magnetic sensor technologies field is gazed at.
In general, after the electronics of ground state is excited by green light, feux rouges is generated when returning to ground state.On the other hand,
Such as the electricity in the nitrogen-atoms and vacancy centre (NVC:Nitrogen Vacancy Center) among diamond lattic structure
Son, by the irradiation of the high frequency magnetic field of 2.87GHz degree, from the lowest class (m in three sublevels among ground states=0), transition
Grade (the m than its higher energy orbital into ground states=± 1).If the electronics of the state is excited by green light, because radiationless
In the case where return to the lowest class (m among ground state in three sublevelss=0), then luminous quantity will be reduced, by detecting the light
It is able to know that by the way that whether high frequency magnetic field has occurred magnetic resonance.
Among a measurement system, circular seam type resonator (Split Ring is set in the lower section of diamond sample
Resonator) or coil antenna or filament formula antenna, from the resonator to the microwave region of sample irradiation 2.87GHz degree
High frequency magnetic field, carry out high frequency magnetic field and exciting light scanning, and by detection device detection the feux rouges from electronics reduction
Amount, the information of the cell near above-mentioned diamond lattic structure is obtained with this (referring for example to non-patent literature 1).
In addition, among battery technology field, especially for widely used lithium battery in automobile and civil field etc.
Battery can envision the situation for having electric leakage or short circuit between electrode due to the removing or harsh use environment of electrode.In order to
When monitor such a situation, such as develop be not required to destroy battery and utilize Magnetic Sensor detection leakage current device.
Patent document 1: Japanese Unexamined Patent Publication 2016-090581 bulletin
Non-patent literature 1:Kento Sasaki, et.al., " Broadband, large-area microwave
antenna for optically-detected magnetic resonance of nitrogen-vacancy centers
in diamode”REVIEW OF SCIENTIFIC INSTRUMENTS 87,053904(2016)
Summary of the invention
But for using the Magnetic Sensor in above situation, due to there are the limit of sensitivity, for Weak current,
Such as the leakage current of nA rank, there is undetectable problems.
In addition, the sensitivity of the Magnetic Sensor of NVC etc. has high sensitivity in high-frequency domain due to the influence of 1/f noise,
This has been public domain, and in order to more effectively improve measurement sensitivity, it is effective for carrying out the modulation of AC in measured place.
In addition, as shown in figure 4, being existed in the case where alternating current is supplied to electrode 150 from power supply 130 by setting
The magnetic detecting element 120 of 150 top of electrode is simulated although being capable of detecting when the leakage current between electrode 150 from Fig. 5
As a result it is known that following the description: due to generating widely distributed magnetic field between electrode 150 by the alternating current, as a result,
Field variation caused by leakage current cannot be clearly seen that.In other words, for the leakage current of nA rank, existing inspection
There is the limit in terms of improving sensitivity for survey method.
The present invention is to complete in view of the above problems, and the purpose is to provide a kind of utilize to have nitrogen vacancy centre
Structure and the Weak current detection device that can be improved detection sensitivity.
Weak current detection device according to the present invention, has: the Magnetic Sensor containing NVC；And vector potential device.
It can be improved in accordance with the invention it is possible to obtain one kind and can either detect small leakage current again as Magnetic Sensor
Sensitivity Weak current detection device.
Detailed description of the invention
Fig. 1 is the figure for indicating Weak current detection device involved in embodiment of the present invention 1.
Fig. 2 is the schematic diagram for indicating the Magnetic Sensor involved in embodiment of the present invention 1, containing NVC.
Fig. 3 is indicated in Fig. 1 of Weak current detection device involved in embodiment of the present invention 1 along A-A ' section
Figure.
Fig. 4 is the figure for indicating existing leakage current detection device.
Fig. 5 is the simulation drawing in the magnetic field between the electrode based on existing detection method.
Symbol description
10: Weak current detection device；20: the Magnetic Sensor containing NVC；21: the sensing comprising the substrate containing NVC
Portion；22: incidence mount；23: outgoing detection device；40: battery；50,150: electrode；60,160: Weak current access；70: to
Measure gesture device；71: tubular body；72: coil case；120: magnetic detecting element；130: power supply.
Specific embodiment
Hereinafter, illustrating a specific embodiment of the invention with reference to the accompanying drawings.
Embodiment 1
Fig. 1 is the figure for indicating Weak current detection device 10 involved in embodiments of the present invention 1.Weak current detection
Device 10 has: the Magnetic Sensor 20 containing NVC；And vector potential device 70.In the electrode of the battery 40 as check object
50 top, the Magnetic Sensor 20 containing NVC of the Weak current detection device 10, with it is parallel with electrode 50 and with battery 40
Discontiguous mode and be arranged.
In addition, Fig. 2 is the schematic diagram for indicating the Magnetic Sensor involved in embodiments of the present invention 1, containing NVC.Such as
Shown in Fig. 2, the Magnetic Sensor 20 containing NVC has: detecting means 21, incidence mount 22 comprising the substrate containing NVC, outgoing inspection
Survey device 23 and magnetic field generation device 24.
The operating principle of the Magnetic Sensor for containing NVC 20 is illustrated.
Among the NVC structure in the cvd diamond substrate of detecting means 21, trapped electron forms magnetic quantum number ms=-1,
0 ,+1 Spin-triplet.Originally, the green laser which is emitted from incidence mount 22, from ms=0 ground state excitation and
High level is transitted to, but returns to m while issuing red fluorescent laters=0 ground state.But by being produced from magnetic field
The alternating current magnetic field B that generating apparatus 24 generates, in such a electron transition to ms=+1 or -1 ground state and from this by laser
In the case where excitation, also the electronics of some do not shine and the phenomenon that return to ground state.It is, when detecting emergent light,
Using outgoing detection device 23, it is able to detect the drop point of feux rouges brightness.Magnetic field strength can be measured using the phenomenon.Also
It is that, due to being influenced by the magnetic field from the leakage current described below, the brightness of emergent light further changes, by going out
It penetrates detection device 23 and detects the variation, it is known that the variation of magnetic field strength.
In addition, in order to improve the sensitivity of the Magnetic Sensor 20 containing NVC, if the magnetic field of measured object have exchange at
Point, then sensitivity is enhanced.By applying alternating voltage variation to measured object, leakage current becomes according to alternating voltage
Change, also there is alternating component with the magnetic field that this is generated, be capable of the detection of higher precision.
But merely apply AC electric current between electrode 50, the alternating current magnetic field as the prior art can be generated, for solution
The certainly project, the vector potential device 70 that use describes below.
Vector potential device 70 is that Wire-wound at coiled type and after forming long tubular body 71, is for example utilized the tubulose
Big coil case 72 made of the further winding of body 71.It is, vector potential device 70 is closed circuit.In addition, vector potential
Device 70 is formed as surrounding the shape of the battery 40 as check object.In addition, since the diameter of tubular body 71 is small, Fig. 1 it
In, tubular body 71 indicated by the solid line.In other words, the electrode 50 of battery 40 is with the opening face of the coil case with vector potential device 70
Parallel mode and be arranged.
Fig. 3 is indicated in Fig. 1 of Weak current detection device involved in embodiment of the present invention 1 along A-A ' section
Figure.Among Fig. 3, indicate that the solid line of tubular body 71 is conducting wire.In addition, the multiple rounds formed by conducting wire, indicate tubular body
71 section.As shown in figure 3, if applying alternating current among such a vector potential device 70, in the big coil case 72
Among the inner space of winding-structure, the state that no magnetic field only exists AC field can be produced.As a result, such as Fig. 3 institute
Show, uniform AC field (alternating voltage) can be produced between the electrode 50 of battery 40.
By such a structure, between the electrode 50 of battery 40, even if due to removing of crack or electrode etc.
And there is Weak current access 60, small leakage current is generated by the Weak current access 60, due to by the small electric
Stream is formed by magnetic field and applies the alternating component from vector potential device 70, so can by the Magnetic Sensor 20 containing NVC
Easily detect the leakage current.
In addition, the diameter D of coil case 72 is formed by by the tubular body 71, preferably than electricity among vector potential device 70
It is pond 40, especially bigger than electrode 50.
In addition, the scanning one of the Magnetic Sensor 20 containing NVC can be carried out on one side in the case where the area of battery 40 is big
Frontier inspection looks into Leakage Current.
In addition, expression is that magnetic field generation device 24 and incidence mount 22, outgoing detection device 23 are arranged among Fig. 2
In the side different from the detecting means 21 comprising the substrate containing NVC, but also can be set in identical side.
Industrial practicability
The present invention can be suitable for such as relative to the device for detecting Weak current battery.
Claims (3)
1. a kind of Weak current detection device, which is characterized in that have: the Magnetic Sensor containing NVC；And vector potential device.
2. Weak current detection device according to claim 1, which is characterized in that the Magnetic Sensor tool containing NVC
It is standby: detecting means, incidence mount comprising the substrate containing NVC, outgoing detection device and magnetic field generation device.
3. Weak current detection device according to claim 1 or 2, which is characterized in that the vector potential device is formed as
Surround the shape of check object.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018072103A JP7396787B2 (en) | 2018-04-04 | 2018-04-04 | Microcurrent detection device and microcurrent detection method |
| JP2018-072103 | 2018-04-04 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110346627A true CN110346627A (en) | 2019-10-18 |
| CN110346627B CN110346627B (en) | 2024-08-23 |
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|---|---|---|---|
| CN201910262219.1A Active CN110346627B (en) | 2018-04-04 | 2019-04-02 | Micro-current detection device |
Country Status (2)
| Country | Link |
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| JP (1) | JP7396787B2 (en) |
| CN (1) | CN110346627B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113671408A (en) * | 2021-08-09 | 2021-11-19 | 国仪量子(合肥)技术有限公司 | Leakage current detection method and detection device for lithium battery |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024181575A1 (en) * | 2023-03-01 | 2024-09-06 | 京セラ株式会社 | Current sensor and current detection device |
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Also Published As
| Publication number | Publication date |
|---|---|
| JP7396787B2 (en) | 2023-12-12 |
| JP2019184296A (en) | 2019-10-24 |
| CN110346627B (en) | 2024-08-23 |
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