CN105785287A - Ultrasensitive magnetic field sensor based on optical microcavity - Google Patents
Ultrasensitive magnetic field sensor based on optical microcavity Download PDFInfo
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- CN105785287A CN105785287A CN201610270459.2A CN201610270459A CN105785287A CN 105785287 A CN105785287 A CN 105785287A CN 201610270459 A CN201610270459 A CN 201610270459A CN 105785287 A CN105785287 A CN 105785287A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
- G01R33/032—Measuring direction or magnitude of magnetic fields or magnetic flux using magneto-optic devices, e.g. Faraday or Cotton-Mouton effect
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/0052—Manufacturing aspects; Manufacturing of single devices, i.e. of semiconductor magnetic sensor chips
Abstract
The invention provides an ultrasensitive magnetic field sensor based on an optical microcavity. The optical microcavity is composed of a micro nano optical fiber, a microtubule and magnetic fluid. The micro nano optical fiber winds the outer wall of the microtubule by one cycle. The inner part of the microtubule is hollow and the magnetic fluid is packaged therein. The input end and the output end of the micro nano optical fiber are respectively connected with a broadband light source and a spectrum analyzer. The micro nano optical fiber winds the outer wall of themicrotubule by one cycle and is crossly overlapped, thereby forming an overlapping area. An electromagnetic wave is transmitted from the broadband light source and is transmitted to the optical microcavity through the micro nano optical fiber. According to the ultrasensitive magnetic field sensor, a structure in which the micro nano optical fiber winds the microtubule by one cycle is arranged, and contact between the electromagnetic wave and the magnetic fluid is greatly improved, thereby realizing higher sensitivity.
Description
Technical field
The present invention relates to the ultra-sensitivity magnetic field sensor of a kind of optically-based microcavity, there is high sensitivity.
Background technology
Optical microcavity is a kind of important photonic device, there is high quality factor and the advantage of small mode volume, receive significant attention on basis and application, for instance Eurytrema coelomatium, nonlinear optics, extremely low threshold value micro-cavity laser, high sensor etc..The optical micro-cavity sensors volume with Echo Wall mode of resonance is little, highly sensitive, detection limit is low, and biochemical molecule can realize markless detection, and detection confidence is high, has very much practical value.
Magnetic fluid is a kind of stable colloidal solutions formed in Suitable carrier liquids by the ferromagnetism even particulate dispersion superscribing surfactant.As a kind of new functional material, magnetic fluid has a lot of unique magneto-optical property, such as tunable refractive index characteristic, thermal lensing effect, Faraday effect, birefringence effect, magnetostrictive effect etc..These character of magnetic fluid have been developed and have been applied in a lot of optics, such as filter lens, adjustable optical switch, magneto-optic modulator etc..Among many character, being most widely used of tunable refractive index characteristic, utilize the sensing solutions of optics that this characteristic makes and realization to get more and more.
If the tunable refractive index characteristic of the high sensitivity characteristic of echo wall mode optical micro-cavity and magnetic fluid is combined, then highly sensitive magnetic field sensing can be realized.Its ultimate principle is as follows: optical microcavity is placed under magnetic field to be measured, under the effect of externally-applied magnetic field, the refractive index of magnetic fluid changes, namely the tuning as wave filter of whole device is achieved, the resonance wavelength ultimately resulting in output optical signal changes, by being demodulated just can detecting the information in magnetic field to be measured to output signal.
Summary of the invention
The present invention is directed to the problem that current magnetic field sensor sensitivity is not high, it is proposed that a kind of optically-based microcavity there is extremely highly sensitive magnetic field sensor.
The technical solution used in the present invention is as follows:
The present invention includes the fixing micro-nano fiber being packaged together, micro-pipe and magnetic fluid and the optical microcavity that formed, field signal is converted into optical signal by optical microcavity, micro-nano fiber is wrapped in the outer wall of micro-pipe, and draw two ends respectively as input and outfan, the inner hollow of micro-pipe is packaged with magnetic fluid, the input of micro-nano fiber and outfan connect wide spectrum light source and spectroanalysis instrument respectively, micro-nano fiber is wrapped in micro-pipe outer wall and forms overlay region, overlay region micro-nano fiber above is input section, the micro-nano fiber that overlay region is positioned below is deferent segment, input section and deferent segment form overlay region；Electromagnetic wave is sent by wide spectrum light source, transmitting to overlay region through micro-nano fiber, the electromagnetic wave part in input section couples directly to deferent segment, and another part continues to propagate along micro-nano fiber, arriving deferent segment after resonator cavity interior resonance again, the electromagnetic wave after superposition finally exports to spectroanalysis instrument.
One circle of described micro-nano fiber is wrapped in the outer wall of micro-pipe, and the input of a circle and outfan exist juxtaposition and be wound around the part of micro-pipe outer wall, and are close to layout up and down as overlay region, the input of overlay region and the micro-nano fiber of outfan.
Described micro-pipe is tube structure, and magnetic fluid is filled in cylinder, does not have any bubble or gap between micro-tube wall and magnetic fluid.
By solidifying glue parcel solidification outside described micro-nano fiber, micro-pipe and magnetic fluid, and it is little to solidify the refractive index of micro-nano fiber fibre core described in glue refractive index ratio.By overlay region with the fully enclosed fixing encapsulation technology of micro-pipe, curing is not limited only to UV curing method.
Described micro-nano fiber cross section is circular, and diameter is in micron dimension；The cross section of micro-pipe is annular, and pipe thickness is in micron dimension.
Described overlay region length obtains according to the parameter optimization of optical source wavelength, micro-tube wall and magnetic fluid.
Further, the principle of optical microcavity is:
(1) optical microcavity of described Whispering-gallery-mode is a wave filter, and wavelength meets the electromagnetic wave of certain condition more easily by this structure and to be continued to propagate in spectroanalysis instrument, forms corresponding frequency spectrum；
(2) in the middle of optical microcavity, the refractive index of the magnetic fluid of dress is relevant with extraneous magnetic field size, owing to electromagnetic wave is coupled in optical microcavity, man-to-man change can be there is along with the change of magnetic fluid refractive index by the electromagnetic frequency spectrum of microcavity, namely there is certain skew relative to original frequency spectrum (being not added with magnetic field), then, Magnetic Field has just been integrated in the middle of electromagnetic frequency spectrum, by observing frequency spectrum, just can extrapolate the size in added magnetic field.
Micro-nano fiber is tightly around after micro-Guan Yizhou, and the length of the overlay region of micro-nano fiber is set as certain particular value, so that electromagnetic couple state is best.Owing to this is the device of one very small (micron dimension) precision, any spot or dust all can damage its function, therefore, this structure is totally immersed in also uncured liquid curing glue, then solidification adhesive curing is made with ultraviolet radiation, to prevent it contaminated or to corrode, its relative position also can be made to keep fixing simultaneously.
Therefore, the refractive index of magnetic fluid and solidification glue must be less than the refractive index of the fibre core of micro-nano fiber, propagates so that electromagnetic wave is limited in micro-nano fiber and does not become separated in flight.
The invention have the benefit that
The filtering property of optical microcavity is combined by the present invention with the tunable refractive index characteristic of magnetic fluid, take full advantage of the high quality factor of optical microcavity and the advantage of the highfield sensitivity of magnetic fluid, and have employed micro-nano fiber around optical microcavity one week and the specific special construction of overlay region length such that it is able to produce and there is extremely highly sensitive magnetic field sensor.
Accompanying drawing explanation
Fig. 1 is the integral module block diagram of the present invention.
Fig. 2 is the structural representation (before wrapping solidification glue) of optical microcavity in the present invention.
Fig. 3 is the structural representation (after wrapping solidification glue) of optical microcavity in the present invention.
In figure, 1. wide spectrum light source, 2. micro-nano fiber, 3. overlay region, 4. micro-pipe, 5. magnetic fluid, 6. solidify glue, 7. spectroanalysis instrument, 8. input section, 9. deferent segment.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention is further described.
As shown in Figure 1, the present invention comprises three modules: wide spectrum light source 1, optical microcavity and spectroanalysis instrument 7, and the delivery outlet micro-nano fiber 2 of wide spectrum light source 1 is connected to optical microcavity, optical microcavity, for field signal is converted into optical signal, is then connected to the input port of spectroanalysis instrument 7.
As shown in Figure 2, optical microcavity includes fixing micro-nano fiber 2, micro-pipe 4 and the magnetic fluid 5 being packaged together, micro-nano fiber 2 is wrapped in the outer wall of micro-pipe 4, and draw two ends respectively as input and outfan, the inner hollow of micro-pipe 4 is packaged with magnetic fluid 5, the input of micro-nano fiber 2 and outfan connect wide spectrum light source 1 and spectroanalysis instrument 7 respectively, micro-nano fiber 2 is wrapped in micro-pipe 4 outer wall and forms overlay region 3, overlay region 3 micro-nano fiber above 2 is input section 8, and the micro-nano fiber 2 that overlay region 3 is positioned below is deferent segment 9.
Electromagnetic wide range light is sent by wide spectrum light source 1, transmit to overlay region 3 through micro-nano fiber 2, an electromagnetic wave part in input section 8 couples directly to deferent segment 9, another part continues to propagate along micro-nano fiber 2, arriving deferent segment 9 after resonator cavity interior resonance again, the electromagnetic wave after superposition finally exports to spectroanalysis instrument 7.
One circle of micro-nano fiber 2 is wrapped in the outer wall of micro-pipe 4, and the input of a circle and outfan exist the part of overlap wrapping micro-pipe 4 outer wall, and are close to layout as overlay region 3, the input of overlay region 3 and the micro-nano fiber about 2 of outfan.
Micro-pipe 4 is tube structure, and magnetic fluid 5 is filled in cylinder, does not have any bubble or gap between micro-pipe 4 tube wall and magnetic fluid 5；The cross section of micro-pipe 4 be annular, the external diameter of micro-pipe 4 can with but be not limited only to 120um, wall thickness can with but be not limited only to 4um.Micro-nano fiber 2 cross section is circular, diameter can with but be not limited only to 300nm.
Being solidified by solidification glue 6 parcel outside micro-nano fiber 2, micro-pipe 4 and magnetic fluid 5, solidifying before glue 6 solidifies is liquid, is solid-state after solidification, and the refractive index solidifying glue 6 refractive index ratio micro-nano fiber 2 fibre core is little.
Specific embodiment of the invention process is as follows:
First construct optical microcavity in the following ways: in micro-pipe 3, suck magnetic fluid 4 with test tube, now magnetic fluid 4 riddles micro-pipe 3 inner chamber, with fluid sealant by micro-pipe 3 sealing two ends, by micro-nano fiber 2 tightly around micro-pipe 3 one weeks, and have part micro-nano fiber 2 overlap wrapping to form overlay region 3, as shown in Figure 2.Then it has been covered with the solidification glue 5 of defencive function on said structure surface, whole said structure has been immersed in the middle of the solidification glue 5 of liquid, then made it solidify with ultraviolet radiation, it is thus achieved that as shown in Figure 3.
Optical microcavity is placed in magnetic field to be measured, the wide range electromagnetic wave of the stable and uniform produced by wide spectrum light source is propagated in optical microcavity via micro-nano fiber, extraneous Magnetic Field can be incorporated into by the electromagnetic wave of this device by optical microcavity, then the electromagnetic wave of this process processing continues on through and is propagated in spectroanalysis instrument by micro-nano fiber, by analyzing the electromagnetic spectrum in spectroanalysis instrument, it is possible to obtain corresponding magnetic field size.Through experimental analysis, the sensitivity of this magnetic field sensor is up to about 800nm/RIU.
As can be seen here, the present invention, by the advantage of the highfield sensitivity of the high quality factor and magnetic fluid that take full advantage of optical microcavity, have employed described specific special construction, and the magnetic field sensor of formation has high sensitivity, has prominent significant technique effect.
Claims (6)
1. the ultra-sensitivity magnetic field sensor of an optically-based microcavity, it is characterized in that: include the fixing micro-nano fiber (2) being packaged together, micro-pipe (4) and magnetic fluid (5) and the optical microcavity that formed, field signal is converted into optical signal by optical microcavity, micro-nano fiber (2) is wrapped in the outer wall of micro-pipe (4), and draw two ends respectively as input and outfan, the inner hollow of micro-pipe (4) is packaged with magnetic fluid (5), the input of micro-nano fiber (2) and outfan connect wide spectrum light source (1) and spectroanalysis instrument (7) respectively, micro-nano fiber (2) is wrapped in micro-pipe (4) outer wall and forms overlay region (3), overlay region (3) micro-nano fiber (2) above is input section (8), the micro-nano fiber (2) that overlay region (3) is positioned below is deferent segment (9)；Electromagnetic wave is sent by wide spectrum light source (1), through micro-nano fiber (2) transmission to overlay region (3), an electromagnetic wave part in input section (8) continues conduction along micro-nano fiber (2), a part couples directly to deferent segment (9), and the electromagnetic wave being formed by stacking finally exports to spectroanalysis instrument (7).
2. the ultra-sensitivity magnetic field sensor of a kind of optically-based microcavity according to claim 1, it is characterized in that: a circle of described micro-nano fiber (2) is wrapped in the outer wall of micro-pipe (4), there is the part of overlap wrapping micro-pipe (4) outer wall in the input of one circle and outfan, and it is close to layout up and down as overlay region (3), the input of overlay region (3) and the micro-nano fiber (2) of outfan.
3. the ultra-sensitivity magnetic field sensor of a kind of optically-based microcavity according to claim 1, it is characterized in that: described micro-pipe (4) is tube structure, magnetic fluid (5) is filled in cylinder, does not have any bubble or gap between micro-pipe (4) tube wall and magnetic fluid (5).
4. the ultra-sensitivity magnetic field sensor of a kind of optically-based microcavity according to claim 1, it is characterized in that: described micro-nano fiber (2), micro-pipe (4) and magnetic fluid (5) outside solidify by solidifying glue (6) parcel, and it is little to solidify the refractive index of micro-nano fiber (2) fibre core described in glue (6) refractive index ratio.
5. the ultra-sensitivity magnetic field sensor of a kind of optically-based microcavity according to claim 1, it is characterised in that: described micro-nano fiber (2) cross section is circular, and diameter is in micron dimension；The cross section of micro-pipe (4) is annular, and pipe thickness is in micron dimension.
6. the ultra-sensitivity magnetic field sensor of a kind of optically-based microcavity according to claim 1, it is characterised in that: described overlay region (3) length obtains according to the parameter optimization of optical source wavelength, micro-pipe (4) tube wall and magnetic fluid (5).
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Cited By (5)
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| CN109085680A (en) * | 2018-08-14 | 2018-12-25 | 浙江大学 | A kind of packaging method based on the mechanical micro-nano fiber for drawing cone |
| CN109342789A (en) * | 2018-10-18 | 2019-02-15 | 西安电子科技大学 | A kind of all-fiber current sensor and preparation method thereof |
| CN109884558A (en) * | 2019-02-20 | 2019-06-14 | 江苏大学 | A kind of magnetic field sensor based on photonic crystal panel microcavity |
| CN112924907A (en) * | 2021-01-26 | 2021-06-08 | 北京邮电大学 | High-sensitivity three-dimensional magnetic field detection method using optical microcavity |
| CN112924908A (en) * | 2021-01-26 | 2021-06-08 | 北京邮电大学 | Magnetic field gradient detection method based on magneto-optical effect in optical microcavity |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109085680A (en) * | 2018-08-14 | 2018-12-25 | 浙江大学 | A kind of packaging method based on the mechanical micro-nano fiber for drawing cone |
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| CN109884558A (en) * | 2019-02-20 | 2019-06-14 | 江苏大学 | A kind of magnetic field sensor based on photonic crystal panel microcavity |
| CN112924907A (en) * | 2021-01-26 | 2021-06-08 | 北京邮电大学 | High-sensitivity three-dimensional magnetic field detection method using optical microcavity |
| CN112924908A (en) * | 2021-01-26 | 2021-06-08 | 北京邮电大学 | Magnetic field gradient detection method based on magneto-optical effect in optical microcavity |
| CN112924908B (en) * | 2021-01-26 | 2021-11-09 | 北京邮电大学 | Magnetic field gradient detection method based on magneto-optical effect in optical microcavity |
| CN112924907B (en) * | 2021-01-26 | 2021-11-09 | 北京邮电大学 | High-sensitivity three-dimensional magnetic field detection method using optical microcavity |
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