CN108957367A - A kind of high spatial resolution Optical Microsphere Cavities magnetic field sensing system - Google Patents
A kind of high spatial resolution Optical Microsphere Cavities magnetic field sensing system Download PDFInfo
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- CN108957367A CN108957367A CN201810631779.5A CN201810631779A CN108957367A CN 108957367 A CN108957367 A CN 108957367A CN 201810631779 A CN201810631779 A CN 201810631779A CN 108957367 A CN108957367 A CN 108957367A
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- microsphere cavities
- magnetic field
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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
- G01R33/0327—Measuring direction or magnitude of magnetic fields or magnetic flux using magneto-optic devices, e.g. Faraday or Cotton-Mouton effect with application of magnetostriction
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Abstract
The invention proposes a kind of high spatial resolution Optical Microsphere Cavities magnetic field sensing system, the voltage tuning port of tunable laser is sent into the two paths of signals of signal generator output of the invention all the way, is sent to oscillograph all the way.The transmitting terminal of tunable laser and the input terminal of isolator connect, and the output end of isolator and the input terminal of attenuator connect, and are provided with Polarization Controller on the optical fiber between the output end and optical taper input terminal of attenuator.The light field of optical taper output enters in Microsphere Cavities in such a way that evanescent wave couples, intracavitary light field can also be by optical taper coupling output to the receiving end of photodetector, the signal of photodetector output enters oscillograph, and the signal of oscillograph output enters data processing and display system.Low-refraction uv-curable glue is by Microsphere Cavities, optical taper together with magnetostriction medium bonding.The present invention has the advantages that high spatial resolution, detectable low frequency magnetic field, low cost, low-power consumption, electromagnetism interference.
Description
Technical field
The present invention relates to a kind of high spatial resolution Optical Microsphere Cavities magnetic field sensing systems, and in particular to be by magnetic
The magnetic field sensing system for causing flexible medium and Optical Microsphere Cavities building, belongs to optical field.
Background technique
The superconducting quantum interference device that the means of biomagnetic measurement mainly work at low temperature at present, it is most emerging
The magnetometer of optical instrument is still limited by spatial resolution.The novel magnetic field detection based on Optical Microsphere Cavities that we have proposed a kind of
Scheme, can obtain the spatial resolution of hundred micron dimensions, while have both low cost and the advantages of low-power consumption, it is following may be direct
It is detected applied to anomalous field in biomagnetic measurement or monitoring area.In addition, it can also be integrated in fibre system, not by electricity
Magnetic disturbance and remote probe can be carried out.Current biological magnetic field detecting devices cost is high, and the operating condition of low temperature makes its volume
It is huge, the demand of different patients, such as the brain magnetic detection of young children can not be adapted to when being detected, it may be necessary to detect
The distance between equipment and human brain are adjustable, to guarantee detection accuracy, for another example some ICU patients for being not suitable for movement,
Movement sensing device may be needed, being made into the moveable equipment of helmet-type can be more practical.But existing superconducting quantum interference device
Part is still unable to satisfy these demands.We devise a kind of Optical Microsphere Cavities magnetic field sensing array system, have hundred micron dimensions
Spatial resolution, by system optimization obtain needed for detectivity after, can satisfy these actual detection demands.
Summary of the invention
In view of the deficiencies of the prior art, the present invention proposes a kind of high spatial resolution Optical Microsphere Cavities magnetic field sensing systems
System, can be used for requiring the detection of magnetic field field of high spatial resolution and low frequency magnetic field detectivity.
A kind of high spatial resolution Optical Microsphere Cavities magnetic field sensing system, including signal generator, tunable laser, every
From device, attenuator, Polarization Controller, optical taper, magnetostriction medium, Microsphere Cavities, low-refraction uv-curable glue, photodetection
Device, oscillograph, data processing and display system；
The two paths of signals of the signal generator output is sent into the voltage tuning port of tunable laser all the way, all the way
It is sent to oscillograph；The light exit side of tunable laser and the input terminal of isolator connect, the output end of isolator and decaying
The input terminal of device connects, and polarization control is provided on the optical fiber between the output end of attenuator and one or more optical taper input terminals
Device processed；When wherein connecing multiple optical tapers, light-splitting device is equipped between Polarization Controller and multiple optical tapers；Each optical taper output
Light field enter in Microsphere Cavities in such a way that evanescent wave couples, intracavitary light field is by each optical taper coupling output to corresponding light
The receiving end of electric explorer, the signal of photodetector output enter oscillograph, and the signal of oscillograph output enters data processing
With display system.Tunable laser, isolator, attenuator, Polarization Controller, optical taper, photodetector in sensor-based system
Between connection be all made of optical fiber connection；It is connected between photodetector and oscillograph using the general electricity cable of two-port；
Wherein Microsphere Cavities are fixed on magnetostriction medium by low-refraction uv-curable glue, and the Microsphere Cavities and magnetostriction are situated between
The position of matter and optical taper be it is fixed, the refractive index value of low-refraction uv-curable glue will guarantee that light field passes in Microsphere Cavities
It is defeated；The input optical wavelength that the diameter of section of the cone area part of the optical taper is 0.5-0.75；The Microsphere Cavities and optical fiber
Cone is in couple state always.
Preferably, the tuning range of the tunable laser will cover the required investigative range of experiment, wave band choosing
With communication band, and match with the receiving wave range of detector.
Preferably, the Microsphere Cavities diameter is 80-500 microns.
Preferably, the material of the Microsphere Cavities is silica.
Preferably, the Microsphere Cavities replace with column microcavity or ampuliform microcavity, guarantee the maximum gauge in the space of chamber
It is 80-500 microns, and the low-loss transmission in it of the light field of light source output, while there are evanescent waves in chamber outer surface.
Preferably, the magnetostriction medium is that Terfenol-D or other can stretch under magnetic fields
Medium.
Preferably, the shape of the magnetostriction medium is plate, cylinder or helmet-like.
Preferably, the optical fiber will guarantee the low-loss transmission of optical signal and easily detection in selected wave band.
Preferably, the polarization state of the Polarization Controller will guarantee the optical figure of merit highest of optical mode.
Preferably, the attenuator will guarantee to reach receivable power model of the optical power in detector of detector
In enclosing.
Sensor-based system in the present invention has very high spatial resolution when carrying out magnetic field sensing, and has low frequency magnetic field
Detectivity.Meanwhile the system is mainly constructed by optical fiber, and it is small in size, it is easy of integration, the remote probe of Magnetic Field can be carried out.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the high spatial resolution Optical Microsphere Cavities magnetic field sensing system of invention；
Fig. 2 is the schematic diagram of high spatial resolution Optical Microsphere Cavities magnetic field sensing array made of being expanded based on Fig. 1.
Specific embodiment
Below by the specific embodiment substantive distinguishing features that the present invention is furture elucidated and marked improvement, but it is of the invention
Content is not limited solely to following embodiment:
Specific embodiment 1: as shown in Figure 1, high spatial resolution Optical Microsphere Cavities magnetic field described in present embodiment passes
Sensing system includes signal generator 1, tunable laser 2, isolator 3, attenuator 4, Polarization Controller 5, optical taper 6, mangneto
Flexible medium 7, Microsphere Cavities 8, low-refraction uv-curable glue 9, photodetector 10, oscillograph 11, data processing and display are
System 12.Wherein, the two paths of signals that signal generator 1 exports is sent into the voltage tuning port of tunable laser 2 all the way, send all the way
Enter to oscillograph 11.The light exit side of tunable laser 2 is connect with the input terminal of isolator 3, the output end of isolator 3 with decline
Subtract the input terminal connection of device 4, is provided with Polarization Controller on the optical fiber between 6 input terminal of output end and optical taper of attenuator 4
5.The light field that optical taper 6 exports enters in Microsphere Cavities 8 in such a way that evanescent wave couples, and intracavitary light field can also pass through optical taper
6 coupling outputs are to the receiving end of photodetector 10, and the signal that photodetector 10 exports enters oscillograph 11, and oscillograph 11 is defeated
Signal out enters data processing and display system 12.Tunable laser 2, isolator 3, attenuator 4, polarization in sensor-based system
Controller 5, optical taper 6, the connection between photodetector 10 are all made of optical fiber connection；Photodetector 10 and oscillograph 11 it
Between connected using the general electricity cable of two-port.Data processing system 12 is believed the magnetic field detected on oscillograph 11 is handled
Number, and its value is displayed on the screen.The variation of external magnetic field will lead to magnetostriction medium 7, and deformation occurs, and then causes micro-
It will be comprising Magnetic Field, at data in the transmission spectrum of the long chamber for changing, thus being measured on oscillograph 11 of the chamber of spherical cavity 8
Reason can demodulate the intensity and frequency information in magnetic field.
Specific embodiment 2: embodiment is described with reference to Fig. 2, present embodiment is to height described in embodiment one
The supplement of spatial resolution Optical Microsphere Cavities magnetic field sensing system, the sensor-based system are visited in addition to that can carry out the magnetic field of single-point
Outside surveying, it can also expand as the sensor array of multiple spot detection of magnetic field.By bonded on magnetostriction medium multiple Microsphere Cavities with
Optical taper coupled system can obtain magnetic field sensing array, carry out the detection of magnetic field of multiple spot.It needs in actual mechanical process inclined
The device 13 that can be divided is added after vibration controller, such as fiber coupler.Meanwhile in the optical taper output end of multiple sensing units
Also the photodetector 14,15 for accordingly increasing corresponding number is received.Light-splitting device 13 in Fig. 2 can be more than one
Fiber coupler can be the beam splitting system that multiple couplers are constituted, be divided into required multichannel light as needed.Magnetic in Fig. 2
Field detection array can be not limited only to three microballoons, can construct required detection of magnetic field unit, the position of microballoon is as needed
Selection.If it is necessary, Polarization Control can be added before being sent into optical taper in the light that fiber coupler exports
Device.In addition, the oscillograph 11 for data acquisition also can use the data collecting card substitution of multichannel.
Specific embodiment 3: illustrating that present embodiment, present embodiment are to one He of embodiment in conjunction with Fig. 1 and Fig. 2
High spatial resolution Optical Microsphere Cavities magnetic field sensing system further limits described in two.Microsphere Cavities 8 are first placed on mangneto
On flexible medium 7, and light field is coupled into Microsphere Cavities 8 using optical taper 6, instills low-refraction in the region of three's contact
Uv-curable glue 9, the position for continuing to adjust optical taper 6 make glue curing using ultraviolet light irradiation to optimal couple state, into
And fix the position of Microsphere Cavities and optical taper on magnetostriction medium.Before ultraviolet light irradiation, light can be adjusted according to demand
The couple state of fibre cone and Microsphere Cavities.Microsphere Cavities 8 could alternatively be column microcavity, ampuliform microcavity or other shapes of microcavity, only
Guarantee to be closely sized to, and the light field of light source output low-loss can be transmitted in it, while existing in chamber outer surface and suddenly dying
Wave.The shape of magnetostriction medium 7 can be plate, cylinder or helmet-like etc., according to specific application scenarios and practical sensing
The arrangement demand of array is designed, as long as guaranteeing under magnetic fields, deformation occurs, and lead to the chamber long hair of resonant cavity
Changing.
Claims (10)
1. a kind of high spatial resolution Optical Microsphere Cavities magnetic field sensing system, it is characterised in that: including signal generator (1), can
It is tuned laser (2), isolator (3), attenuator (4), Polarization Controller (5), optical taper (6), magnetostriction medium (7), micro-
Spherical cavity (8), low-refraction uv-curable glue (9), photodetector (10), oscillograph (11), data processing and display system
(12)；
The two paths of signals of described signal generator (1) output is sent into the voltage tuning port of tunable laser (2) all the way, and one
Road is sent to oscillograph (11)；The light exit side of tunable laser (2) is connect with the input terminal of isolator (3), isolator (3)
Output end connect with the input terminal of attenuator (4), the output end of attenuator (4) and one or more optical taper (6) input terminals
Between optical fiber on be provided with Polarization Controller (5)；When wherein connecing multiple optical tapers (6), Polarization Controller (5) and multiple optical fiber
It bores and is equipped with light-splitting device between (6)；The light field of each optical taper (6) output enters Microsphere Cavities in such a way that evanescent wave couples
(8) in, receiving end of the intracavitary light field by each optical taper (6) coupling output to corresponding photodetector (10), photodetection
The signal of device (10) output enters oscillograph (11), and the signal of oscillograph (11) output enters data processing and display system
(12)；Tunable laser (2), isolator (3), attenuator (4), Polarization Controller (5), optical taper (6), light in sensor-based system
Connection between electric explorer (10) is all made of optical fiber connection；Two-port is used between photodetector (10) and oscillograph (11)
General electricity cable connection；Wherein Microsphere Cavities (8) are fixed on magnetostriction medium by low-refraction uv-curable glue (9)
(7) on, the position of the Microsphere Cavities and magnetostriction medium and optical taper is fixed, the folding of low-refraction uv-curable glue
Radiance rate value will guarantee that light field is transmitted in Microsphere Cavities；The diameter of section of the cone area part of the optical taper is the defeated of 0.5-0.75
Enter optical wavelength；The Microsphere Cavities and optical taper are in couple state always.
2. high spatial resolution Optical Microsphere Cavities magnetic field sensing system according to claim 1, it is characterised in that: described
The tuning range of tunable laser to cover experiment needed for investigative range, wave band select communication band, and with detector
Receiving wave range matches.
3. high spatial resolution Optical Microsphere Cavities magnetic field sensing system according to claim 1, it is characterised in that: described
Microsphere Cavities diameter is 80-500 microns.
4. high spatial resolution Optical Microsphere Cavities magnetic field sensing system according to claim 1, it is characterised in that: described
The material of Microsphere Cavities is silica.
5. high spatial resolution Optical Microsphere Cavities magnetic field sensing system according to claim 1, it is characterised in that: described
Microsphere Cavities replace with column microcavity or ampuliform microcavity, guarantee that the maximum gauge in the space of chamber is 80-500 microns, and light source output
Light field low-loss transmission in it, while there are evanescent waves in chamber outer surface.
6. high spatial resolution Optical Microsphere Cavities magnetic field sensing system according to claim 1, it is characterised in that: described
Magnetostriction medium is Terfenol-D or other media that can be stretched under magnetic fields.
7. high spatial resolution Optical Microsphere Cavities magnetic field sensing system according to claim 1, it is characterised in that: described
The shape of magnetostriction medium is plate, cylinder or helmet-like.
8. high spatial resolution Optical Microsphere Cavities magnetic field sensing system according to claim 1, it is characterised in that: described
Optical fiber will guarantee the low-loss transmission of optical signal and easily detection in selected wave band.
9. high spatial resolution Optical Microsphere Cavities magnetic field sensing system according to claim 1, it is characterised in that: described
The polarization state of Polarization Controller will guarantee the optical figure of merit highest of optical mode.
10. high spatial resolution Optical Microsphere Cavities magnetic field sensing system according to claim 1, it is characterised in that: described
Attenuator to guarantee reach detector optical power in the receivable power bracket of detector.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109631961A (en) * | 2019-01-15 | 2019-04-16 | 中国科学技术大学 | A kind of optical sensor based on double ampuliform micro resonant cavities |
| CN109633821A (en) * | 2018-12-24 | 2019-04-16 | 暨南大学 | A kind of preparation method and microwave photon filter of microcavity coupled system |
| CN110471008A (en) * | 2019-08-08 | 2019-11-19 | 天津大学 | Vector fibre optic magnetic field sensor and preparation method thereof based on eccentric tiny balloon chamber |
| CN111580024A (en) * | 2020-04-30 | 2020-08-25 | 杭州电子科技大学 | Optical resonance type magnetic field sensor with high sensitivity area having wide frequency band |
| CN113324946A (en) * | 2021-06-11 | 2021-08-31 | 合肥鸿科传感科技有限公司 | Multiple microbubble cavity coupling enhanced sensing technology |
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| CN101975763A (en) * | 2010-08-24 | 2011-02-16 | 中北大学 | Integrated probe type microsphere cavity sensor |
| CN102435348B (en) * | 2011-11-17 | 2014-01-08 | 中北大学 | High-Q optical microcavity-based temperature sensor and distributed type temperature sensing network |
| CN107015173B (en) * | 2017-05-25 | 2019-07-23 | 杭州电子科技大学 | A kind of enhanced Whispering-gallery-mode optical resonator magnetic field sensing system |
| CN107238745A (en) * | 2017-05-25 | 2017-10-10 | 杭州电子科技大学 | The alternating current sensor-based system of high sensitivity column Whispering-gallery-mode optical resonator |
| CN107255742A (en) * | 2017-05-25 | 2017-10-17 | 杭州电子科技大学 | A kind of Whispering-gallery-mode optical resonator alternating voltage sensor-based system |
| CN107014522B (en) * | 2017-05-25 | 2019-05-14 | 杭州电子科技大学 | A kind of Whispering-gallery-mode optical resonator temperature-sensing system |
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- 2018-06-19 CN CN201810631779.5A patent/CN108957367B/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109633821A (en) * | 2018-12-24 | 2019-04-16 | 暨南大学 | A kind of preparation method and microwave photon filter of microcavity coupled system |
| CN109631961A (en) * | 2019-01-15 | 2019-04-16 | 中国科学技术大学 | A kind of optical sensor based on double ampuliform micro resonant cavities |
| CN110471008A (en) * | 2019-08-08 | 2019-11-19 | 天津大学 | Vector fibre optic magnetic field sensor and preparation method thereof based on eccentric tiny balloon chamber |
| CN111580024A (en) * | 2020-04-30 | 2020-08-25 | 杭州电子科技大学 | Optical resonance type magnetic field sensor with high sensitivity area having wide frequency band |
| CN113324946A (en) * | 2021-06-11 | 2021-08-31 | 合肥鸿科传感科技有限公司 | Multiple microbubble cavity coupling enhanced sensing technology |
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Effective date of registration: 20211206 Address after: 230000 B-1015, wo Yuan Garden, 81 Ganquan Road, Shushan District, Hefei, Anhui. Patentee after: HEFEI MINGLONG ELECTRONIC TECHNOLOGY Co.,Ltd. Address before: 310018 No. 2 street, Xiasha Higher Education Zone, Hangzhou, Zhejiang Patentee before: HANGZHOU DIANZI University |
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Effective date of registration: 20230921 Address after: No.101, Hangtian Road, hi tech Zone, Yantai City, Shandong Province Patentee after: YANTAI HENGRUN KUNCAI INFORMATION TECHNOLOGY Co.,Ltd. Address before: 230000 B-1015, wo Yuan Garden, 81 Ganquan Road, Shushan District, Hefei, Anhui. Patentee before: HEFEI MINGLONG ELECTRONIC TECHNOLOGY Co.,Ltd. |