CN208255383U - The full optical magnetic field sensors of optical fiber fluorescence and system - Google Patents
The full optical magnetic field sensors of optical fiber fluorescence and system Download PDFInfo
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- CN208255383U CN208255383U CN201721787159.8U CN201721787159U CN208255383U CN 208255383 U CN208255383 U CN 208255383U CN 201721787159 U CN201721787159 U CN 201721787159U CN 208255383 U CN208255383 U CN 208255383U
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Abstract
The utility model discloses a kind of full optical magnetic field sensors of optical fiber fluorescence and systems.Wherein sensor includes: optical fiber；And Nano diamond NV colour center fluorescence coating, it is installed on one end of the optical fiber.Wherein Nano diamond NV colour center fluorescence coating is attached on one end of the optical fiber by optical cement；Or optical fiber includes internal fiber cores, on one end that the Nano diamond NV colour center is installed on optical fiber by way of being embedded in fiber cores one end.The sensor technology of the utility model substantially only measures the optical signal in optical fiber, and measurement response frequency is high, and nuclear structure is simple.
Description
Technical field
The utility model belongs to optical fiber fluorescent sensor field, senses further to a kind of full optical magnetic field of optical fiber fluorescence
Device further relates to a kind of full optical magnetic field sensor-based system of optical fiber fluorescence.
Background technique
Fibre optical sensor be widely used in displacement, vibration, rotation, pressure, bending, strain, speed, acceleration, electric current,
The measurement of the physical quantitys such as magnetic field, voltage, humidity, temperature, sound field, flow, concentration, PH value and strain, and in current informationization
Generation be widely applied the main reason in it is important there are three.One is to have many excellent material properties because of optical fiber,
Such as: the performance interfered with anti-electromagnetism and atomic radiation, the mechanical performance that diameter is thin, matter is soft, light-weight；It insulate, is inductionless
Electric property；Water-fast, high temperature resistant, corrosion resistant chemical property.The other is the intensity of the light transmitted in optical fiber, phase, frequency
Or polarization state etc. can directly or indirectly be measured property modulation.There are one be exactly showed in optical information system big broadband,
Large capacity, the remarkable advantage etc. for transmitting and being able to achieve at a distance multi-parameter, distribution, low energy consumption sensing.
However the existing fiber magnetic field sensing technology in optical fiber sensing technology, it often needs to add to inside of optical fibre or surrounding at present
Enter magnetostriction material, magnetic nanoparticle material, uses up reading deformation data or magnetic field again using the conversion in magnetic field to deformation
Driving particle redistribution in turn results in the variation of optical index around or within fiber cores.But these materials of above-mentioned addition are often
In application circumstances (such as: in the environment of high voltage substation etc. has high-strength induction field) bring potential security risk
Or pollutant (induced current heat production, magnetic-particle diffusion pollution), and structure is complicated for core devices mostly, also vulnerable to temperature
Etc. environmental disturbances.
Optical fiber fluorescence lifetime measurement temperature techniques are often applied in particular surroundings, have measurement accurate, stability is good, sensitive
High advantage is spent, the equipment than the methods of fluorescent intensity has more advantage, so fluorescence lifetime method is current optical fiber fluorescence sensing neck
The mainstream applications and developing direction in domain.
Utility model content
In view of this, the purpose of this utility model is to provide a kind of full optical magnetic field sensors of optical fiber fluorescence and system,
At least partly to solve the problems, such as techniques discussed above.
One side according to the present utility model provides a kind of full optical magnetic field sensors of optical fiber fluorescence, comprising:
Optical fiber；And Nano diamond NV colour center fluorescence coating, it is installed on one end of the optical fiber.
In a further embodiment, the Nano diamond NV colour center fluorescence coating is attached to the light by optical cement
On fine one end.
In a further embodiment, the optical fiber includes internal fiber cores, and the Nano diamond NV colour center is logical
The mode for crossing insertion fiber cores one end is installed on one end of optical fiber.
In a further embodiment, in the Nano diamond fluorescence coating, the content of NV colour center is 1 × 1016It is a every
Cubic centimetre or more.
It in a further embodiment, further include protective case, the protective case is set on optical fiber one end, to coat
State Nano diamond NV colour center fluorescence coating.
In a further embodiment, the protective case is tetrafluoroethene protective case.
It in a further embodiment, further include bypass fibers fluorescence temperature measurement module, for complete optical fluorescence
Life method measures ambient temperature.
Another aspect according to the present utility model provides a kind of full optical magnetic field sensor-based system of optical fiber, comprising:
A kind of sensor of any of the above；Light intensity and fluorescence lifetime duplex measurement unit, are connected to the other end of the optical fiber,
For measuring light intensity signal and phase signal on optical fiber.
In a further embodiment, the duplex measurement unit is that programmable double lock-in amplifiers and time figure turn
The light intensity and fluorescence lifetime duplex measurement unit of parallel operation composition.
In a further embodiment, the light intensity and fluorescence lifetime duplex measurement unit further include photoelectric measuring device
And time-to-digital converter chip.
The technical solution used using the utility model, the application for being fully able to meet the full optical measurement magnetic field of optical fiber are wanted
It asks, is in particular in:
Compared to traditional optical fiber that magnetostriction material, magnetic nanoparticle material need to be added to inside of optical fibre or surrounding
Magnetic field sensing technology is brought latent in application circumstances (such as: in the environment of high voltage substation etc. has high-strength induction field)
Security risk or pollutant (induced current heat production, magnetic-particle diffusion pollution), the utility model show this synthesis
It obviously can be to avoid above-mentioned potential security risk or pollution using diamond NV colour center and the full optical magnetic field method for sensing of optical fiber
Object；
The optical signal in optical fiber is only measured on the utility model technological essence, measurement response frequency is high, and nuclear structure is simple,
Easy to process and use for a long time is highly suitable for the induced magnetic field monitoring of high voltage substation, high-speed rail high-voltage fence paradoxical discharge
Monitoring and spark discharge device induced magnetic field monitoring etc. occasions；
It can be applied to fluorescence lifetime or the full optical magnetic field measurement of fluorescence intensity, be suitble to the spies such as electromagnetic environment complexity, high voltage
In terms of different environment induction magnetic-field measurement.
Detailed description of the invention
Fig. 1 and Fig. 2 is the fluorescence of the NV colour center of the full optical magnetic field sensors of the utility model embodiment optical fiber fluorescence respectively
The energy level contrast schematic diagram that nonradiative transition changes under with and without external magnetic field (B) effect；
Fig. 3 is the full optical magnetic field sensors of optical fiber of the utility model embodiment at external magnetic field (B), and luminescence generated by light is strong
Relative value and fluorescence lifetime relative value are spent with the variation schematic diagram in magnetic field；
Fig. 4 is the non-embedded type schematic diagram of the full optical magnetic field sensors of optical fiber of the utility model embodiment；
Fig. 5 is the full optical magnetic field sensors embedded type schematic diagram of optical fiber of the utility model embodiment；
Fig. 6 is a kind of full optical magnetic field sensor-based system design of portable fiber-optic of practical application of the utility model embodiment
Schematic diagram.
Specific embodiment
For the purpose of this utility model, technical solution and advantage is more clearly understood, below in conjunction with specific embodiment, and
Referring to attached drawing, the utility model is described in further detail.The advantages of the utility model and effect will be practical by this
Novel disclosure of that and it is more significant.Illustrate that appended attached drawing simplified and used as illustrating herein.It is shown in the drawings
Component count, shape and size can modify according to actual conditions, and the configuration of component is likely more complexity.This is practical new
Otherwise practice or application can also be carried out in type, and without departing from the condition of spirit and scope defined in the utility model
Under, various change and adjustment can be carried out.
According to existing fiber magnetic field sensing technology, often need that magnetostriction material, magnetism is added to inside of optical fibre or surrounding
Nano-particle material uses up reading deformation data or the redistribution of field drives particle in turn using the conversion in magnetic field to deformation again
Cause the variation of optical index around or within fiber cores.But these materials of above-mentioned addition are often in application circumstances,
And structure is complicated for core devices mostly, also vulnerable to environmental disturbances such as temperature.
The basic conception of the utility model is, provides the Fibre Optical Sensor without containing conductive materials or removable nano particle
Device avoids similar having used the fibre optic magnetic field sensing technology of magnetostriction material or magnetic-particle material under application circumstances
Defect；And it is to eliminate the intermediate conversion steps that optical quantities are arrived in magnetic field to deformation again using full optical magnetic field measuring technique, knot
Structure is as simple and reliable as possible, and using convenient, measurement fast response time, magnetic field strength measurement range is wide.
According to the one side of the utility model embodiment, a kind of full optical magnetic field sensors of optical fiber fluorescence are provided, comprising:
Optical fiber；And Nano diamond NV colour center fluorescence coating, it is installed on one end of the optical fiber.
Since to belong to the prior art existing for Nano diamond NV colour center fluorescence coating here, the utility model is not
It is related to the improvement in terms of material.
The testing principle first to the present embodiment sensor is subjected to theory analysis below:
Negatively charged NV colour center is by associated with vacancy (V) in diamond phase neighbour's lattice position in diamond
It substitutes nitrogen-atoms (N), vacancy captures electronics composition, has C3v symmetrical structure.As shown in Figure 1, under the conditions of having external magnetic field,
The Zeeman that ground state level related with electron spin and excited level occurs cleaves, and the photoinduction of this NV defect spin pole
Change and the layout distribution of the electron energy level of spin correlation changes, cause nonradiative transition to increase, eventually lead to: fluorescence lifetime subtracts
Small and luminescence generated by light reduces.So NV defect optic response can be used to extract the information about external magnetic field, most practical spy
Property is: in Nano diamond particle, the NV of multiple symmetrical axis direction random distributions, and when external magnetic field (B) is in the range of 0-150G,
Its luminescence generated by light and fluorescence lifetime STATISTICAL STRENGTH value reduce with the increase in magnetic field, as shown in figure 3, and contrast decline it is general
More than 30%.
When this Nano diamond particle containing NV colour center, after being encapsulated as optical fibre device, as shown in Figure 4, so that it may use
It is measured in full optical magnetic field, and the component of the device only contains；C, Si, O, N, H these types nonmetalloid.It is (common
Inorganic optical fiber core component is SiO2, and fiber cores are outside or the strip of paper used for sealing of organic fiber is then mainly made of C, H, O element, and crucial
Single-crystalline diamond containing NV is then C, N element composition.)
Specific embodiment according to the present utility model, as shown in figure 4, the full optical magnetic field sensors of the optical fiber can be by
Nano diamond particle, optical cement, tetrafluoroethene protective case, the single multimode fiber composition of the colour center containing NV, the utility model packet
Containing two kinds: non-embedded optical-fiber type design；As shown in figure 5, being insertion optical-fiber type design.
In Fig. 4, optical fiber 4 can pass through the nanometer of optical cement 2 and the colour center containing NV on one end for single multimode fiber
Diamond particles form in the installation to optical fiber 4 of fluorescence coating 1, and typical 1 preparation method of NV Nano diamond fluorescence coating is in optical fiber
It is glued on 4 end faces and takes a small amount of optical cement 2, then adhere to one layer of NV colour center average content 1 × 1016It is a per cubic centimeter above
Nano diamond particle；In addition, be coated with protective case 3 on one end of installation NV Nano diamond fluorescence coating 1, protective case can be with
For tetrafluoroethene material, the NV Nano diamond fluorescence coating under tetrafluoroethene protective case and optical cement protection can be at -150 DEG C
~125 DEG C of temperature range, anti-shake performance are outstanding.
In Fig. 5, optical fiber 4 can be single multimode fiber, and internal is that fiber cores 5 can be by embedding on fiber cores one end
Enter mode to be mounted thereon N Nano diamond fluorescence coating, which can further cover optical cement 2 and protective case 3, same to rise
To anti-vibration effect.Data processing for sensor sensing, the utility model are implemented to use luminous intensity measurement method and fluorescence lifetime
The measurement method that both data acquisition plans of phase measurement combine.If only measuring the light intensity signal in optical fiber, thus
Gone out changes of magnetic field using light intensity reacting condition, although fairly simple, optical fiber luminous intensity measurement be easier to it is affected by environment, in reality
It is very unstable in production run；The utility model design using with the photoelectric measuring device of highly sensitive and high response frequency and
Time-to-digital converter chip (such as: avalanche diode and time-to-digit converter), the double HF2LI lock-in amplifiers of complex programmable,
By phase method come precise measurement fluorescence lifetime, but because lock-in amplifier while available amplitude and phase information, institute
Light intensity and fluorescence lifetime signal can be obtained simultaneously with the utility model, to more accurately obtain external magnetic field.In addition optical fiber is used
Fluorescence temperature measurement system specially to reflect that ambient temperature changes, corrects NV colour center fluorescence magnetic field measurement system by temperature change
And the measurement error generated.
According to the another aspect of the utility model embodiment, a kind of full optical magnetic field sensor-based system, including the above institute are provided
The sensor stated；And fluorescence lifetime measurement unit, it is connected to the other end of the optical fiber, for measuring the letter of the light intensity on optical fiber
Number.
In some embodiments, the duplex measurement unit is programmable double lock-in amplifiers and time-to-digit converter group
At light intensity and fluorescence lifetime duplex measurement unit.
In some embodiments, the light intensity and fluorescence lifetime duplex measurement unit further include photoelectric measuring device with timely
Between digital conversion chip.
It is illustrated below with reference to specific example, it will be appreciated that, connection type and optical element in detail below
Description be only used for understanding the utility model, but should not be understood as the restriction carried out to it.
As shown in fig. 6, the utility model embodiment provides a kind of portable fiber-optic full optical magnetic field sensor-based system design, one
The full optical magnetic field sensor-based system design of kind portable fiber-optic, it is noted that following elements is only to schematically illustrate, and is not to use
In limitation the utility model.The wherein 614 full optical magnetic field sensing probe marked for the utility model Fig. 3；The system can wrap
It includes terminal and shows 601；Embedded card computer and high-speed data acquisition card 602；Signal generator 603；Time-to-digit converter
604 (such as model TDC-GP22)；Fiber optic fluorescence temperature measuring system host 605；(the double HF2LI of correlation function filter 606
Locking phase amplification)；Laser driver 607；Gain amplifier 608；523nm laser diode 609；Photodetector 610；Snowslide
Photodiode 611；The short pass filter 612 of 550nm；630nm long pass filter 613；Optical fiber fluorescence magnet field probe 614；Optical fiber
Fluorescence lifetime temp probe 615；Y optical fiber 616 and 617 and fiber optic fluorescence temperature measuring system optical fiber 618.
Wherein, the be excited optical path of fluorescence of NV colour center is described as follows in Nano diamond: what laser diode 9 issued
The exciting light of 523nm after paths on Y optical fiber 617, excites full light after the short pass filter 611 of 550nm is filtered
The Nano diamond NV colour center fluorescence coating in magnetic field sensing probe 14 is learned, issues fluorescence through the lower optical path of Y optical fiber 617, and pass through
630nm long pass filter 613 is beaten on avalanche photodide 611 after filtering.The declarative procedure of electronic signature capture and processing
As follows: sinusoidal signal occurs for embedded card computer and 602 control signal generator 603 of high-speed data acquisition card, drives through laser
After dynamic device 607 amplifies, driving 523nm laser diode 609 emits the laser intensity also laser of sinusoidal variations therewith, synchronous signal
Generator 603, which imports laser driving sinusoidal signal as reference signal, may be programmed locking phase shown in correlation function filter 606
Amplifier HF2LI (has coherent detection function, cross noise filtering), obtains amplitude, and it generates relatively better cycle data again
It imports in time-to-digit converter 604, is labeled as " stat " signal road.
Simultaneously photodetector 610 acquire 16 beam splitting of Y optical fiber NV colour center exciting light and the signal that generates, through correlation function
Input time digital quantizer 604 after filter 606 filters is labeled as " stop1 " signal road；In addition avalanche photodide
611 collect the fluorescence signal for 600nm~700nm that NV colour center is generated by the excitation of 532nm light, through correlation function filter
Input time digital quantizer 604 after 606 detection filters is labeled as " stop2 " signal road；Above " start ", " stop1 " and
" stop2 " --- it is compared in time-to-digit converter 604, to obtain signal amplitude and phase difference, the two is respectively corresponded
Photoluminescence intensity and fluorescence lifetime are because the two all external magnetic fields are monotonous descending functions, in embedded card computer and high speed number
(wherein, fiber optic fluorescence temperature measuring system host 605, fiber optic fluorescence temperature measurement system after being influenced according to the amendment temperature of capture card 602
System optical fiber 618, optical fiber fluorescence service life temp probe 615 form fluorescence temperature measurement module), and calibrate value list and compare, it obtains
External magnetic field size is finally shown in terminal and shows on 601.
As shown in fig. 6, the full optical magnetic field sensor-based system of portable fiber-optic of design includes two kinds of data acquisition modes: orthogonal
Locking phase amplifying method and time-to-digit converter detection method, expand systematic difference condition.
Above system has used subject fluorescent service life temperature measurement system to calibrate removal temperature and influence.Portable system data
Processing mode is: laser drive signal is imported coherent detection as reference signal (can compile shown in correlation function filter 606
Journey lock-in amplifier has coherent detection function, crosses noise filtering), amplitude is obtained, and it generates relatively better cycle data again
It pours into TDC, peak time extraction is carried out, to obtain phase difference.Signal amplitude and phase difference, the two respectively correspond photic hair
Luminous intensity and fluorescence lifetime final can compare with calibration value because the two all external magnetic fields are monotonous descending functions, obtain outer magnetic
The variation of field.
Particular embodiments described above has carried out into one the purpose of this utility model, technical scheme and beneficial effects
Step is described in detail, it should be understood that the foregoing is merely specific embodiment of the utility model, are not limited to this reality
With novel, within the spirit and principle of the utility model, any modification, equivalent substitution, improvement and etc. done should all include
It is within the protection scope of the utility model.
Claims (9)
1. a kind of full optical magnetic field sensors of optical fiber fluorescence, characterized by comprising:
Optical fiber；
Nano diamond NV colour center fluorescence coating, is installed on one end of the optical fiber.
2. the full optical magnetic field sensors of optical fiber fluorescence according to claim 1, which is characterized in that
The Nano diamond NV colour center fluorescence coating is attached on one end of the optical fiber by optical cement.
3. the full optical magnetic field sensors of optical fiber fluorescence according to claim 1, which is characterized in that the optical fiber includes inside
Fiber cores, on one end that the Nano diamond NV colour center is installed on optical fiber by way of being embedded in fiber cores one end.
4. the full optical magnetic field sensors of optical fiber fluorescence according to claim 1, which is characterized in that it further include protective case, institute
It states protective case to be set on optical fiber one end, to coat the Nano diamond NV colour center fluorescence coating.
5. the full optical magnetic field sensors of optical fiber fluorescence according to claim 4, which is characterized in that the protective case is tetrafluoro
Ethylene protective case.
6. the full optical magnetic field sensors of optical fiber fluorescence according to claim 1, which is characterized in that further include that bypass fibers are glimmering
Light temperature-measuring module measures ambient temperature for complete optical fluorescence lifetime method.
7. a kind of full optical magnetic field sensor-based system of optical fiber, characterized by comprising:
Any sensor of claim 1-6；
Light intensity and fluorescence lifetime duplex measurement unit, are connected to the other end of the optical fiber, for measuring the letter of the light intensity on optical fiber
Number and phase signal.
8. the full optical magnetic field sensor-based system of optical fiber according to claim 7, which is characterized in that the duplex measurement unit is
The light intensity and fluorescence lifetime duplex measurement unit of programmable double lock-in amplifiers and time-to-digit converter composition.
9. the full optical magnetic field sensor-based system of optical fiber according to claim 8, which is characterized in that the light intensity and fluorescence lifetime
Duplex measurement unit further includes photoelectric measuring device and time-to-digital converter chip.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108254708A (en) * | 2017-12-19 | 2018-07-06 | 中国科学技术大学 | The full optical magnetic field sensors of optical fiber fluorescence and system |
| CN112146782A (en) * | 2020-09-25 | 2020-12-29 | 西北大学 | Method for preparing optical fiber quantum probe with controllable diamond particle doping concentration |
| CN112485734A (en) * | 2020-09-27 | 2021-03-12 | 中国电子科技集团公司第十三研究所 | Method for improving fluorescence collection efficiency of NV color centers of diamonds |
| CN113804941A (en) * | 2021-11-22 | 2021-12-17 | 安徽省国盛量子科技有限公司 | Optical fiber current transformer based on diamond NV color center and measuring method |
| US11531073B2 (en) | 2020-12-31 | 2022-12-20 | X Development Llc | Fiber-coupled spin defect magnetometry |
| CN115494284A (en) * | 2022-11-07 | 2022-12-20 | 安徽省国盛量子科技有限公司 | Quantum current transformer based on loop integration technology and data processing method |
| US11733321B2 (en) | 2019-10-02 | 2023-08-22 | X Development Llc | Magnetometry based on electron spin defects |
| US11774526B2 (en) | 2020-09-10 | 2023-10-03 | X Development Llc | Magnetometry based on electron spin defects |
| US11774384B2 (en) | 2021-01-15 | 2023-10-03 | X Development Llc | Spin defect magnetometry pixel array |
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- 2017-12-19 CN CN201721787159.8U patent/CN208255383U/en active Active
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108254708A (en) * | 2017-12-19 | 2018-07-06 | 中国科学技术大学 | The full optical magnetic field sensors of optical fiber fluorescence and system |
| US11733321B2 (en) | 2019-10-02 | 2023-08-22 | X Development Llc | Magnetometry based on electron spin defects |
| US11774526B2 (en) | 2020-09-10 | 2023-10-03 | X Development Llc | Magnetometry based on electron spin defects |
| CN112146782A (en) * | 2020-09-25 | 2020-12-29 | 西北大学 | Method for preparing optical fiber quantum probe with controllable diamond particle doping concentration |
| CN112146782B (en) * | 2020-09-25 | 2021-11-02 | 西北大学 | Method for preparing optical fiber quantum probe with controllable diamond particle doping concentration |
| CN112485734A (en) * | 2020-09-27 | 2021-03-12 | 中国电子科技集团公司第十三研究所 | Method for improving fluorescence collection efficiency of NV color centers of diamonds |
| US11531073B2 (en) | 2020-12-31 | 2022-12-20 | X Development Llc | Fiber-coupled spin defect magnetometry |
| US11774384B2 (en) | 2021-01-15 | 2023-10-03 | X Development Llc | Spin defect magnetometry pixel array |
| CN113804941A (en) * | 2021-11-22 | 2021-12-17 | 安徽省国盛量子科技有限公司 | Optical fiber current transformer based on diamond NV color center and measuring method |
| CN115494284A (en) * | 2022-11-07 | 2022-12-20 | 安徽省国盛量子科技有限公司 | Quantum current transformer based on loop integration technology and data processing method |
| CN115494284B (en) * | 2022-11-07 | 2023-07-21 | 安徽省国盛量子科技有限公司 | Quantum current transformer based on loop integration technology and data processing method |
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