CN106053389A - Micro-droplet sensing device and method using same to measure refractivity - Google Patents
Micro-droplet sensing device and method using same to measure refractivity Download PDFInfo
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- CN106053389A CN106053389A CN201610352472.2A CN201610352472A CN106053389A CN 106053389 A CN106053389 A CN 106053389A CN 201610352472 A CN201610352472 A CN 201610352472A CN 106053389 A CN106053389 A CN 106053389A
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- microlayer model
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/41—Refractivity; Phase-affecting properties, e.g. optical path length
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/55—Specular reflectivity
- G01N21/552—Attenuated total reflection
Abstract
The invention provides a micro-droplet sensing device and a method using the same to measure refractivity. A single mode fiber forms a taper area through tapering, two ends of the single mode fiber are connected with a wide-spectrum light source and a spectrograph respectively, the taper area is placed in environment liquid, and annular core fiber optical tweezers control a micro-droplet to be close to the taper area; light emitted by the wide-spectrum light source is transmitted in the single mode fiber, is coupled into the micro-droplet by means of an evanescent field when going through the taper area and generates resonance in the mode of an echo wall, transmission light intensity at a resonance wavelength is reduced sharply to form a resonance valley, and the spectrograph is used to collect transmission light for spectrum analysis. The annular core fiber optical tweezers are utilized to control the micro-droplet to enable the same to form a perfect ball cavity, so that the problem that a solid ball echo wall sensor cannot form echo wall resonance due to unsmooth and defective surface of a solid ball is solved, and the micro-droplet is more sensitive to environment changing. The micro-droplet sensing device has wide application in the aspect of environment monitoring.
Description
Technical field
The present invention relates to a kind of fibre-optical sensing device, specifically one utilizes the resonance of the microlayer model Echo Wall to realize
Refractive index, the device of temperature sensing.
Background technology
Tapered fiber coupling microsphere is the structure of the Whispering-gallery-mode resonance of a kind of classics, utilizes tapered fiber to bore surface, district
Evanscent field light can be coupled turnover microsphere spherical cavity efficiently, be coupled into the light of microsphere and occur repeatedly to be all-trans at microsphere inner surface
Penetrate, when light wavelength lambda meetsWherein n is the refractive index of microsphere, and R is microsphere radius, and N is positive integer, this wavelength
Light will produce Whispering-gallery-mode resonance in microsphere, and light is limited in Microsphere Cavities, therefore transmitted spectrum light intensity at this wavelength
Strongly reduce formation Echo Wall resonance paddy, therefore have multiple resonance paddy owing to there is multiple resonant wavelength, between its resonance paddy
Free Spectral RangeMicrosphere in Whispering-gallery-mode resonance has the least mode volume and the highest quality
The factor, there is the narrowest resonance paddy non-linear, therefore has the highest sensitivity at sensory field in it in line spectrum.
Traditional Whispering-gallery-mode resonance generally employing solid ball is as Microsphere Cavities, owing to it is easily controlled.In 2015
Instrumental science is learned by Beijing University, and at its article delivered, " high q-factor optics is micro-with key lab of dynamic test Ministry of Education business Cheng Long et al.
The temperature coefficient research of spherical cavity " in (business Cheng Long, Chinese laser, 2015 (3): 27-32.), the microsphere resonance to Whispering-gallery-mode
Chamber has carried out experimentation, it is proposed that the spherical solid optics cavity of a diameter of 600 μm of Microsphere Cavities, carries out coupling with single mode conical fiber
Close, in optics cavity, produce Whispering-gallery-mode, owing to the resonant wavelength of Whispering-gallery-mode is sensitive to the variations in temperature near spherical cavity,
And then realize temperature sensing.This method utilizes solid ball to achieve temperature sensing as Microsphere Cavities, but due to solid ball surface
Imperfect cause Echo Wall resonance have flaw and solid ball variation with temperature not as liquid spheres sensitive, therefore sensitivity is not
High.
Summary of the invention
It is an object of the invention to provide a kind of small size, high q-factor, in high precision, highly sensitive, it is possible to realize ambient refractive index
Microlayer model sensing device with temperature monitoring.The microlayer model sensing device that the present invention also aims to provide a kind of present invention is used
Method in refractometry.
The microlayer model sensing device of the present invention includes wide spectrum light source 1, single-mode fiber 2, toroidal cores optical fiber optical tweezers 3, spectrogrph
6；Described single-mode fiber 2 is through drawing taper Cheng Yizhui district 2-1, and single-mode fiber two ends connect wide spectrum light source 1 and spectrogrph 6 respectively,
Cone district 2-1 is placed in environmental liquids 5, and toroidal cores optical fiber optical tweezers 3 controls a microlayer model 4 near cone district 2-1；Wide spectrum light source 1
The light sent transmits in single-mode fiber 2, is coupled to microlayer model 4 also from cone district in the way of evanscent field through cone district 2-1
Generation Whispering-gallery-mode resonates, and strongly reduces formation resonance paddy at resonance wave strong point transmitted light intensity, collects transmission light with spectrogrph 6
Carry out spectrum analysis.
The microlayer model sensing device of the present invention can also include:
1, described cone district 2-1 is the region that the diameter using flame fused biconical taper technology to be formed is less than 2 μm.
The diameter of 2, described cone district 2-1 selects 1 μm.
3, microlayer model 4 and cone district 2-1 be smaller than 500nm.
4, microlayer model 4 selects 200nm with the spacing of cone district 2-1.
The centre wavelength of 5, described wide spectrum light source 1 is 1550nm or 1310nm.
A diameter of 20 μm of 6, described microlayer model 4.
The microlayer model sensing device of the present invention for the method for refractometry is:
Step one: wide spectrum light source 1 sends spectral region and covers the light of 1525～1605nm, and light injects single-mode fiber 2 one
End, the single-mode fiber other end is connected to spectrogrph, and regulation spectral detection scope is 1525～1605nm；
Step 2: instill Formation of liquid crystals microlayer model liquid crystal 4 in environmental liquids water 5, by three-dimensional micro-displacement platform manipulation annular
Optical fiber optical tweezers 3 captures microlayer model liquid crystal 4, and near cone district 2-1, observes spectrogrph 6 simultaneously, stops when resonance paddy occurs in spectrum
Manipulation to microlayer model；
Step 3: record the position of certain resonance paddy, change the refractive index of environmental liquids 5, it can be seen that resonance paddy position is sent out
Raw drift, is obtained the refractive index of environmental liquids according to calibration curve by resonant wavelength.
The microlayer model sensing device of the present invention, utilizing drop to efficiently solve, microspheres with solid surface irregularity brings asks
Topic, can effectively overcome scattering loss, it is thus achieved that high Q-value.Additionally, therefore microlayer model owing to having higher thermal coefficient of expansion
Change to ambient temperature is the most sensitive, and its Whispering-gallery-mode resonance formed is to the refractive index near microsphere also and quick
Sense, therefore can be used to realize high-sensitive refractive index and temperature sensor.With toroidal cores optical fiber optical tweezers, microlayer model is carried out non-
Contact stability contorting, can make microlayer model be suspended in environmental liquids, thus maintains perfect spherical cavity characteristic, thus greatly
Improve sensing accuracy and sensitivity.
The operation principle of the present invention is:
In conjunction with Fig. 2, wide spectrum optical transmits in a fiber, is producing the strongest evanscent field through cone district and is being coupled to microlayer model
In, if the radius of microlayer model is R, refractive index is ns, and the ambient refractive index at microlayer model place is ne, then resonant wavelength λ=2 π R/
X, x are the dimensional parameters of microlayer model, Lam theory understand x and meet formula:
In formulaRepresent two patterns of Echo Wall resonance respectively；
In formulaAnd N=ns/ne；
In formulaAi (n) represents the solution of the n-th Airy function；
In formulaL represents the pattern count of microlayer model Whispering-gallery-mode.
By formula it appeared that microlayer model Echo Wall resonant wavelength is closely related with ambient refractive index and microsphere refractive index, because of
This can be used to make index sensor, and temperature can cause the change of microlayer model refractive index and diameter in addition, therefore can also
It is used for making temperature sensor.
It is an advantage of the current invention that:
1, utilize microlayer model to realize Echo Wall resonance, the scattering loss that the least surface roughness is brought, improve Q
Value, effectively raises accuracy of detection and sensitivity.
2, utilize toroidal cores optical fiber optical tweezers to realize the stability contorting to microlayer model, solve asking of microlayer model manipulation difficulty
Topic.
The present invention utilizes toroidal cores optical fiber optical tweezers stability contorting microlayer model to form it into perfect spherical cavity, solves solid ball
Echo Wall sensor is owing to solid ball is rough and defect causes forming the problem that the Echo Wall resonates, the most micro-liquid
Drip the most sensitive to the change of environment.The present invention is widely used in terms of environmental monitoring.
Accompanying drawing explanation
Fig. 1 is the three dimensional structure schematic diagram of microlayer model sensing device.
Fig. 2 is the schematic diagram that optical taper couples with microlayer model.
Fig. 3 is the Echo Wall light field figure formed in microlayer model.
Fig. 4 is the transmitted spectrum analogous diagram utilizing this microlayer model sensing device detection refractive index.
Fig. 5 is the outgoing light field schematic diagram of toroidal cores optical fiber optical tweezers.
Detailed description of the invention
Illustrate below in conjunction with the accompanying drawings and the present invention discussed in more detail:
In conjunction with Fig. 1, the microlayer model sensing device of the present invention includes wide spectrum light source 1, single-mode fiber 2, toroidal cores optical fiber optical tweezers
3, microlayer model 4, environmental liquids 5 and spectrogrph 6；Single-mode fiber 2 is through drawing taper to become a diameter of 1～2 μm, length to bore district arbitrarily
2-1, single-mode fiber two ends connect wide spectrum light source 1 and spectrogrph 6 respectively, and cone district 2-1 is placed in environmental liquids 5, utilizes annular
Core fibre optical tweezer 3 controls a microlayer model 4 and makes it near cone district 2-1；The light that wide spectrum light source 1 sends passes in single-mode fiber 2
Defeated, in the way of evanscent field, it is coupled to microlayer model 4 and produces Whispering-gallery-mode resonance from cone district through cone district 2-1, altogether
The transmitted light intensity at wavelength that shakes strongly reduces formation resonance paddy, collects transmission light with spectrogrph 6 and carries out spectrum analysis.Due to resonance paddy
Position sensitive to ambient refractive index and temperature, therefore realize the real-time monitoring to ambient refractive index and temperature, by altogether
The change of paddy position of shaking draws refractive index or the ambient temperature of surveyed liquid.
The centre wavelength of wide spectrum light source 1 can be 1550nm, 1310nm or other.
Microlayer model 4 is insoluble in environmental liquids 5, and can be captured by toroidal cores optical fiber optical tweezers 3；When environmental liquids 5 it is such as
During water, microlayer model 4 can be liquid crystal or oils；The diameter of microlayer model 4 is advisable with 20 μm.
Cone district 2-1 uses flame fused biconical taper technology to be formed, and its diameter is less than 2 μm, is advisable with 1 μm.
Microlayer model 4 is smaller than 500nm with cone district 2-1's, it is also possible to contact, is advisable with 200nm.
The concrete manufacture method of the microlayer model sensing device of the present invention and as follows for refractometry step:
1, take a section single-mould fiber 2, a length of 2m, divest coat 15～20mm in single-mode fiber middle part, use
Non-woven fabrics dips ethanol and ether mixed liquor, is wiped repeatedly optical fiber jacket, until standby after Qing Jie.
2, using optical fiber to draw cone machine, the part that single-mode fiber divests coat carries out drawing cone, forms cone district 2-1, bores district
Between a diameter of 1～2 μm.
3, take one section of toroidal cores optical fiber, divest coat 20～30mm in optical fiber one end, use non-woven fabrics dip ethanol and
Ether mixed liquor, is wiped repeatedly optical fiber jacket, with optical fiber cutter, ends cutting is smooth after cleaning.
4, use optic fiber polishing machine, the one end after toroidal cores fiber cut is ground the round platform being angled 17 °, grind deep
Degree just crosses annular fibre core, is fabricated to toroidal cores optical fiber optical tweezers 3, uses 980nm laser as the light source of this optical tweezer.
5, the 2-1 two ends, cone district of single-mode fiber are fixed on microscope slide, microscope slide drip environmental liquids water 5 and makes it
Flood cone district 2-1.
6, use spectral region to cover the wide spectrum light source of 1525～1605nm, light is injected single-mode fiber 2 one end, single-mode optics
The fine other end is connected to spectrogrph, and regulation spectral detection scope is 1525～1605nm.
7, in environmental liquids water 5, few Formation of liquid crystals microlayer model liquid crystal 4 is instilled, with three-dimensional micro-displacement platform manipulation ring light
Fine optical tweezer 3 captures microlayer model liquid crystal 4, and near cone district 2-1, observes spectrogrph 6 simultaneously, and it is right to stop when resonance paddy occurs in spectrum
The manipulation of microlayer model.
8, record the position of certain resonance paddy, change the refractive index of environmental liquids 5, it can be seen that resonance paddy position is floated
Move, i.e. can be obtained the refractive index of environmental liquids according to calibration curve by resonant wavelength.
Claims (10)
1. a microlayer model sensing device, including wide spectrum light source (1), single-mode fiber (2), toroidal cores optical fiber optical tweezers (3), spectrogrph
(6)；It is characterized in that: described single-mode fiber (2) is through drawing taper Cheng Yizhui district (2-1), and single-mode fiber two ends connect wide range respectively
Light source (1) and spectrogrph (6), cone district (2-1) is placed in environmental liquids (5), and toroidal cores optical fiber optical tweezers (3) controls a micro-liquid
Drip (4) near cone district (2-1)；The light that wide spectrum light source (1) sends is transmission in single-mode fiber (2), with suddenly in time boring district (2-1)
The mode of field of dying is coupled to microlayer model (4) and produces Whispering-gallery-mode resonance from cone district, anxious at resonance wave strong point transmitted light intensity
Reduce sharply little formation resonance paddy, collect transmission light with spectrogrph (6) and carry out spectrum analysis.
Microlayer model sensing device the most according to claim 1, is characterized in that: described cone district (2-1) is to use flame to melt
Melt the diameter drawing cone technology to be formed and be less than the region of 2 μm.
Microlayer model sensing device the most according to claim 1 and 2, is characterized in that: between microlayer model (4) and cone district (2-1)
Away from less than 500nm.
Microlayer model sensing device the most according to claim 1 and 2, is characterized in that: the middle cardiac wave of described wide spectrum light source (1)
Length is 1550nm or 1310nm.
Microlayer model sensing device the most according to claim 3, is characterized in that: the centre wavelength of described wide spectrum light source (1)
It is 1550nm or 1310nm.
Microlayer model sensing device the most according to claim 1 and 2, is characterized in that: a diameter of the 20 of described microlayer model (4)
μm。
Microlayer model sensing device the most according to claim 3, is characterized in that: a diameter of 20 μm of described microlayer model (4).
Microlayer model sensing device the most according to claim 4, is characterized in that: a diameter of 20 μm of described microlayer model (4).
Microlayer model sensing device the most according to claim 5, is characterized in that: a diameter of 20 μm of described microlayer model (4).
10. the microlayer model sensing device described in a claim 1 for the method for refractometry is:
Step one: wide spectrum light source (1) sends spectral region and covers the light of 1525～1605nm, and light injects single-mode fiber (2)
End, the single-mode fiber other end is connected to spectrogrph, and regulation spectral detection scope is 1525～1605nm；
Step 2: instill Formation of liquid crystals microlayer model liquid crystal (4) in environmental liquids water (5), by three-dimensional micro-displacement platform manipulation annular
Optical fiber optical tweezers (3) capture microlayer model liquid crystal (4), and near cone district (2-1), observe spectrogrph (6), when resonance occurs in spectrum simultaneously
The manipulation to microlayer model is stopped during paddy；
Step 3: record the position of certain resonance paddy, change the refractive index of environmental liquids (5), it can be seen that resonance paddy position occurs
Drift, is obtained the refractive index of environmental liquids according to calibration curve by resonant wavelength.
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108051405A (en) * | 2017-11-24 | 2018-05-18 | 中国科学院上海微系统与信息技术研究所 | The refractive index of optical cement measurement device, measuring system and measuring method |
| CN108534911A (en) * | 2018-04-12 | 2018-09-14 | 南昌航空大学 | A kind of temperature sensor and preparation method thereof coupled with microballoon based on D-type optical fiber |
| CN108562374A (en) * | 2018-04-12 | 2018-09-21 | 南昌航空大学 | A kind of temperature sensor coupled with nematic liquid crystal droplet based on D-type optical fiber |
| CN108760683A (en) * | 2018-05-02 | 2018-11-06 | 南昌大学 | A method of being more than core mode wavelength region internal resonance using wavelength and measures solution refractive index |
| CN109632712A (en) * | 2019-01-16 | 2019-04-16 | 北京信息科技大学 | The femtosecond direct write FBG temperature and refractive index measurement method of optical fiber tapered structure |
| CN109827678A (en) * | 2019-03-14 | 2019-05-31 | 哈尔滨工程大学 | A kind of temperature sensor and preparation method thereof that conversion fluorescence is luminous |
| CN110927131A (en) * | 2019-12-02 | 2020-03-27 | 哈尔滨工程大学 | Urease sensing device based on whispering gallery mode laser and manufacturing method thereof |
| CN111077112A (en) * | 2020-01-13 | 2020-04-28 | 北京航空航天大学 | Echo wall mode spherical optical microcavity refractive index sensor based on surface plasma and measuring device |
| CN112268636A (en) * | 2020-09-22 | 2021-01-26 | 北京航空航天大学 | Liquid temperature sensing system based on whispering gallery mode spherical optical microcavity |
| CN112509724A (en) * | 2021-02-03 | 2021-03-16 | 之江实验室 | Method and device for supporting optical trap particles |
| CN112577628A (en) * | 2020-12-14 | 2021-03-30 | 武汉理工大学 | High-sensitivity temperature sensor of cascade light reflection device of interferometer with strong evanescent field |
| CN112683793A (en) * | 2020-12-09 | 2021-04-20 | 哈尔滨工程大学 | Sensor for detecting concentration of liquid drops based on double-microsphere coupling mode splitting |
| CN115575353A (en) * | 2022-09-26 | 2023-01-06 | 哈尔滨工程大学 | Optical fiber refractive index sensor based on whispering gallery mode and measuring method |
| CN115569675A (en) * | 2022-09-23 | 2023-01-06 | 哈尔滨工程大学 | Method and device for generating micro-droplets |
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| CN108051405B (en) * | 2017-11-24 | 2020-06-19 | 中国科学院上海微系统与信息技术研究所 | Optical cement refractive index measuring device, measuring system and measuring method |
| CN108051405A (en) * | 2017-11-24 | 2018-05-18 | 中国科学院上海微系统与信息技术研究所 | The refractive index of optical cement measurement device, measuring system and measuring method |
| CN108534911A (en) * | 2018-04-12 | 2018-09-14 | 南昌航空大学 | A kind of temperature sensor and preparation method thereof coupled with microballoon based on D-type optical fiber |
| CN108562374A (en) * | 2018-04-12 | 2018-09-21 | 南昌航空大学 | A kind of temperature sensor coupled with nematic liquid crystal droplet based on D-type optical fiber |
| CN108760683B (en) * | 2018-05-02 | 2021-03-26 | 南昌大学 | Method for measuring solution refractive index by utilizing resonance in region with wavelength larger than fiber core mold wavelength |
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| CN109632712A (en) * | 2019-01-16 | 2019-04-16 | 北京信息科技大学 | The femtosecond direct write FBG temperature and refractive index measurement method of optical fiber tapered structure |
| CN109827678A (en) * | 2019-03-14 | 2019-05-31 | 哈尔滨工程大学 | A kind of temperature sensor and preparation method thereof that conversion fluorescence is luminous |
| CN110927131A (en) * | 2019-12-02 | 2020-03-27 | 哈尔滨工程大学 | Urease sensing device based on whispering gallery mode laser and manufacturing method thereof |
| CN111077112A (en) * | 2020-01-13 | 2020-04-28 | 北京航空航天大学 | Echo wall mode spherical optical microcavity refractive index sensor based on surface plasma and measuring device |
| CN112268636B (en) * | 2020-09-22 | 2022-06-03 | 北京航空航天大学 | Liquid temperature sensing system based on whispering gallery mode spherical optical microcavity |
| CN112268636A (en) * | 2020-09-22 | 2021-01-26 | 北京航空航天大学 | Liquid temperature sensing system based on whispering gallery mode spherical optical microcavity |
| CN112683793A (en) * | 2020-12-09 | 2021-04-20 | 哈尔滨工程大学 | Sensor for detecting concentration of liquid drops based on double-microsphere coupling mode splitting |
| CN112577628A (en) * | 2020-12-14 | 2021-03-30 | 武汉理工大学 | High-sensitivity temperature sensor of cascade light reflection device of interferometer with strong evanescent field |
| CN112577628B (en) * | 2020-12-14 | 2023-01-17 | 武汉理工大学 | High-sensitivity temperature sensor of cascade light reflection device of interferometer with strong evanescent field |
| CN112509724A (en) * | 2021-02-03 | 2021-03-16 | 之江实验室 | Method and device for supporting optical trap particles |
| CN112509724B (en) * | 2021-02-03 | 2021-04-27 | 之江实验室 | Method and device for supporting optical trap particles |
| CN115569675A (en) * | 2022-09-23 | 2023-01-06 | 哈尔滨工程大学 | Method and device for generating micro-droplets |
| CN115569675B (en) * | 2022-09-23 | 2023-10-17 | 哈尔滨工程大学 | Micro-droplet generation method and generation device thereof |
| CN115575353A (en) * | 2022-09-26 | 2023-01-06 | 哈尔滨工程大学 | Optical fiber refractive index sensor based on whispering gallery mode and measuring method |
| CN115575353B (en) * | 2022-09-26 | 2023-11-07 | 哈尔滨工程大学 | Optical fiber refractive index sensor based on whispering gallery mode and measuring method |
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