CN107796532A - A kind of tip is packaged with the high sensitivity optical fiber thermoprobe of Optical Microsphere - Google Patents
A kind of tip is packaged with the high sensitivity optical fiber thermoprobe of Optical Microsphere Download PDFInfo
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- CN107796532A CN107796532A CN201711315945.2A CN201711315945A CN107796532A CN 107796532 A CN107796532 A CN 107796532A CN 201711315945 A CN201711315945 A CN 201711315945A CN 107796532 A CN107796532 A CN 107796532A
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- optical
- microsphere
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- 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
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- General Physics & Mathematics (AREA)
- Optical Couplings Of Light Guides (AREA)
Abstract
The present invention proposes the high sensitivity optical fiber thermoprobe that a kind of tip is packaged with Optical Microsphere, to solve the problems, such as that microcavity sensors are practical；Including optical fiber, fibre-optical splice and probe, optical fiber both ends are respectively equipped with fibre-optical splice and probe, probe includes beam expansion device, condenser lens and Optical Microsphere, beam expansion device is encapsulated on optical fiber, condenser lens is connected with beam expansion device, Optical Microsphere is packaged with front side of condenser lens, Optical Microsphere is located at the focal point of condenser lens, and Optical Microsphere front portion is provided with scattering point.Far Field Pattern coupling efficiency is improved by way of the present invention is rayleigh scattering, spherical cavity focuses on, gradient-index lens combine；Transducing signal is collected from same port, signal is sent back to and is transferred to signal transacting end in optical fiber again, it is easy to be easy-to-use.The present invention couples the efficiency for improving scattering coupling using the mode of Microsphere Cavities secondary focusing, will typically scatter coupling efficiency 1% and improve to 16.8%.
Description
Technical field
The present invention relates to the technical field of optical fiber micro-nano temperature sensor, more particularly to a kind of tip to be packaged with Optical Microsphere
High sensitivity optical fiber thermoprobe, be a kind of coupling of high efficiency Far Field Scattering optics Whispering-gallery-mode Fibre Optical Sensor probe.
Background technology
Because Whispering-gallery-mode microcavity quality factor is high, small volume, can be used for making low threshold laser, arrowband filter
A variety of optics such as ripple device, broadband frequency comb generator, high sensor.In these devices, it usually needs pass through
One or more coupling devices couple the light into microcavity, and information is extracted from microcavity.Existing a kind of coupling device includes：
Tapered fiber, prism, fiber waveguide, the oblique angle optical fiber head of polishing, photonic crystal fiber etc., the side typically overlapped by mode near field
Formula couples.The efficient coupling of the existing coupling device by mode near field overlap mode is approximately equal to optical wavelength magnitude apart from short；Coupling
The decaying exponential function that intensity is coupling distance is closed, is easily influenceed to cause jitter by microvibration, therefore be
Complicated feedback control or method for packing are commonly used in system to keep signal stabilization.Other a kind of coupled modes are to pass through rational design
The boundary shape of microcavity introduces defect/scattering point so that microcavity pattern can be by the free space focus on light beam of special angle
Excite.In this kind of far field coupled modes, chamber and coupling device need not contact, and the phase-matching condition of energy transmission is by certainly
It is dynamic to meet.But the special chamber of boundary shape has certain technical difficulty from design and making, and for different materials
Microcavity need different microcavity shapes.And use the method for scattering point coupling simple and easy, but coupling efficiency is low and is difficult to
Improve.
The content of the invention
For the practical technical problem of microcavity sensors, the present invention proposes that a kind of tip is packaged with the Gao Ling of Optical Microsphere
Sensitivity optical fiber temperature-measurement probe, it is proposed that based on Particle Scattering, spherical cavity focusing, gradient-index lens, the Whispering-gallery-mode encapsulated
The implementation of Fibre Optical Sensor probe, substantially increases coupling efficiency.
In order to achieve the above object, the technical proposal of the invention is realized in this way：A kind of tip is packaged with Optical Microsphere
High sensitivity optical fiber thermoprobe, including optical fiber, fibre-optical splice and probe, optical fiber both ends are respectively equipped with fibre-optical splice and spy
Head, probe include beam expansion device, condenser lens and Optical Microsphere, and beam expansion device is fixed on optical fiber, condenser lens
It is connected with beam expansion device, Optical Microsphere is packaged with front side of condenser lens, Optical Microsphere is located at the focus of condenser lens
Place, Optical Microsphere front portion are provided with scattering point.
The Optical Microsphere and scattering point are fixed in encapsulation, are encapsulated as the optical glue of low-refraction, are encapsulated optics
Microballoon and scattering point are fixed on the side of condenser lens.
The Optical Microsphere is made up of earth silicon material, and the refractive index of Optical Microsphere is the function of temperature, and light is in optics
In microballoon resonance Whispering-gallery-mode is formed along surface distributed；The optical quality factor of Optical Microsphere is larger, and loss is smaller, detects light
Hundreds thousand of times are increased in Optical Microsphere, Optical Microsphere refractive index is with the slight change of temperature with regard to that can cause visiting for optical signal
Survey response.
A diameter of several microns to tens microns of the Optical Microsphere, Optical Microsphere is point sensor, and point sensor can carry
The three dimensions resolution ratio of temperature survey is risen, Optical Microsphere can be accurately positioned the local temperature change of measurement.
The Optical Microsphere is produced in batches using Liquid injection cooling or collosol and gel.
The scattering point is point defect or nanometer scattering particles, and scattering point scatters light to surrounding；Because Purcell effect,
When the incident light frequency scattered by scattering point meets with microcavity mode frequency, most scattering light will enter optics by scattering
In microballoon.
The beam expansion device pads for optical fiber, and condenser lens is optical fiber lens.
The course of work that a kind of tip is packaged with the high sensitivity optical fiber thermoprobe of Optical Microsphere is：The end face hair of optical fiber
The light beam of injection is extended to the bore close to optical fiber lens, the diverging after extension after a segment distance is transmitted during optical fiber pads
Light beam invests the Optical Microsphere with scattering point by the focusing of optical fiber lens；The light beam projected on Optical Microsphere surface passes through light
Learn the secondary focusing of microballoon in itself accurately to converge on the scattering point of Optical Microsphere top end surface, scattering point dissipates light to surrounding
Penetrate；Because of Purcell effect, incident light frequency is consistent with the microcavity resonant frequency of Optical Microsphere, it is most scattering light scattered into
Enter in Optical Microsphere；Because light path is reversible, the resonance signal light of Optical Microsphere is saturating by optical fiber after scattering point scattering
Mirror and optical fiber pad are back to the optical fiber of input, so as to be collected and analyze.
Beneficial effects of the present invention：The present invention is a kind of optics Whispering-gallery-mode light based on single interface far field coupling device
Fine pickup probe, far field coupling efficiency is improved by way of Particle Scattering, spherical cavity focusing, gradient-index lens combination；From
Same port collects transducing signal, and signal is sent back to and is transferred to signal transacting end in optical fiber again, easy to be easy-to-use.The present invention utilizes micro-
The mode of spherical cavity secondary focusing couples the efficiency for improving scattering coupling, will typically scatter coupling efficiency 1% and improve to 16.8%；Together
When single face, spherical cavity be located at being configured with beneficial to making probe of top.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the structural representation of the present invention.
Fig. 2 is the enlarged drawing of probe shown in Fig. 1.
Fig. 3 is the enlarged drawing of Optical Microsphere in Fig. 2.
In figure, 1 is fibre-optical splice, and 2 be optical fiber, and 3 be probe, and 31 beam expansion devices, 311 be that optical fiber pads, and 32 be poly-
Focus lens, 321 be optical fiber lens, and 33 be encapsulation, and 34 be Optical Microsphere, and 35 be scattering point.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not paid
Embodiment, belong to the scope of protection of the invention.
As shown in Figure 1, Figure 2 and Figure 3, a kind of tip is packaged with the high sensitivity optical fiber thermoprobe of Optical Microsphere, including
Optical fiber 2, fibre-optical splice 1 and probe 3, the both ends of optical fiber 2 be respectively equipped with fibre-optical splice 1 and probe 3, fibre-optical splice 1 facilitate optical fiber 2 with
Other fiber-optic signal lines are connected, and pop one's head in for detecting temperature change.Fiber core layer 21 is provided with optical fiber 2, for launching light beam
And transmitting beam.Probe 3 includes beam expansion device 31, condenser lens 32 and Optical Microsphere 34, and beam expansion device 31 is fixed
On optical fiber 2, condenser lens 32 is connected with beam expansion device 31, and the front side of condenser lens 32 is provided with Optical Microsphere 34, light
The focal point that microballoon 34 is located at condenser lens 32 is learned, Optical Microsphere 34 is anterior to be provided with scattering point 35, and scattering point 35 is arranged on optics
The top of microballoon 34.The section of condenser lens 32 and beam expansion device 31 is rectangle.Optical Microsphere 34 is encapsulated in probe 3
Tip, beam expansion device 31 are arranged between the end face of condenser lens 32 and optical fiber 2.
Optical Microsphere in the present invention plays sensor, it can by the change transitions of environment temperature into resonance optical wavelength
Change.Optical Microsphere 34 is made up of earth silicon material, and earth silicon material has photorefractive effect, that is to say, that Optical Microsphere
34 refractive index is the function of temperature, and light forms Whispering-gallery-mode in Optical Microsphere 34 along surface distributed, Whispering-gallery-mode
Resonant wavelength is strongly dependent upon the refractive index of material.Therefore the temperature around microballoon, which changes, can cause microballoon refraction index changing,
And then cause the violent variation of mode resonance wavelength.
Optical Microsphere is as the advantage of sensor：Sensitivity is high, accurate positioning, the response time is short, making is simple.
A key factor for influenceing optical sensor sensitivity is the intensity of light-matter interaction, and interaction strength and light
Strong positive correlation.
The optical quality factor of Optical Microsphere 34 is bigger with mode volume, and therefore, input light intensity is in Optical Microsphere 34
Inside it is increased hundreds thousand of times, the refractive index of Optical Microsphere 34 is with the slight change of temperature with regard to that can cause the detectable sound of optical signal
Should.If using tens microns as the smallest dimension weighed, traditional thermometer is body sensor, and film temperature sensor is that face passes
Sensor, the Bragg grating on optical fiber is line sensor, and diameter can be considered as in several microns to tens microns of microballoon and pass
Sensor.
A diameter of several microns to tens microns of Optical Microsphere 34, Optical Microsphere 34 is point sensor, and point sensor can carry
The three dimensions resolution ratio of temperature survey is risen, Optical Microsphere 34 can be accurately positioned the local jump in temperature of measurement.Meanwhile small yardstick
The thermal capacitance small response time to temperature change of Optical Microsphere 34 it is short.Finally, spherical cavity is that current all kinds of echo wall dies decline
Most easily make what is obtained in chamber.Optical Microsphere 34 is produced in batches using Liquid injection cooling or collosol and gel, thus with make it is simple,
The advantages of cost is cheap.
Scattering point 35 is point defect or nanometer scattering particles, and scattering point 35 scatters light to surrounding；Because Purcell effect,
When the incident light frequency scattered by scattering point 35 meets with microcavity resonant frequency, most scattering light will enter light by scattering
Learn in microballoon 34.
Beam expansion device 31 is optical fiber pad 311, and condenser lens 32 is optical fiber lens 321.Condenser lens 32, light beam expand
Scattering point 35 on extending apparatus 31 and microballoon combines the bidirectional couple for realizing luminous energy between Transmission Fibers and microballoon.
The course of work：The light beam that the end face of optical fiber 2 is launched is expanded after a segment distance is transmitted in optical fiber pad 311
To the bore close to optical fiber lens 321, the divergent beams after extension are invested with scattering point 35 by the focusing of optical fiber lens 321
Optical Microsphere 34.Projecting the light beam on the surface of Optical Microsphere 34, the secondary focusing of itself accurately converges to by Optical Microsphere 34
On the scattering point 35 of the top end surface of Optical Microsphere 34, scattering point 35 scatters light to surrounding.Because Purcell effect be present（the
Purcell effect）, the microcavity resonant frequency of incident light frequency and Optical Microsphere 34 meets, and most scattering light will be dissipated
In the microcavity for injecting Optical Microsphere 34.Because this light path is reversible, the resonance signal light of Optical Microsphere 34 is by scattering
The scattering of point 35, the optical fiber of input is back to by optical fiber lens 321 and the optical fiber pad 311 of coupled system again, so as to be collected,
Analysis.
Preferably, Optical Microsphere 34 and scattering point 35 are fixed in encapsulation 33.Encapsulation 33 is the optical glue of low-refraction,
Optical Microsphere 34 and scattering point 35 are fixed on the side of condenser lens 32 by encapsulation 33.Encapsulation 33 is adhered on optical fiber lens 321,
Its front end face is smooth arc, reduces the influence to other devices.Encapsulation 33 ensure that the independences and stably of sensor-based system.Envelope
33 are filled using low-refraction optical glue closing Optical Microsphere 34 and optical fiber lens 321 so that optical fiber lens 321 and Optical Microsphere
34 relative position is fixed, and keeps the stability of coupling.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
God any modification, equivalent substitution and improvements made etc., should be included in the scope of the protection with principle.
Claims (8)
1. a kind of tip is packaged with the high sensitivity optical fiber thermoprobe of Optical Microsphere, it is characterised in that including optical fiber（2）, light
Fine joint（1）And probe（3）, optical fiber（2）Both ends are respectively equipped with fibre-optical splice（1）And probe（3）, probe（3）Expand including light beam
Extending apparatus（31）, condenser lens（32）And Optical Microsphere（34）, beam expansion device（31）It is fixed on optical fiber（2）On, focus on saturating
Mirror（32）With beam expansion device（31）It is connected, condenser lens（32）Front side be packaged with Optical Microsphere（34）, Optical Microsphere
（34）Positioned at condenser lens（32）Focal point, Optical Microsphere（34）Front portion is provided with scattering point（35）.
2. tip according to claim 1 is packaged with the high sensitivity optical fiber thermoprobe of Optical Microsphere, it is characterised in that
The Optical Microsphere（34）And scattering point（35）It is fixed on encapsulation（33）It is interior, encapsulation（33）For the optical glue of low-refraction, envelope
Dress（33）By Optical Microsphere（34）And scattering point（35）It is fixed on condenser lens（32）Side.
3. tip according to claim 1 or 2 is packaged with the high sensitivity optical fiber thermoprobe of Optical Microsphere, its feature exists
In the Optical Microsphere（34）It is made up of earth silicon material, Optical Microsphere（34）Refractive index be temperature function, light is in light
Learn microballoon（34）It is middle to form resonance Whispering-gallery-mode along surface distributed；Optical Microsphere（34）The optical quality factor it is larger, loss
Smaller, detection light is in Optical Microsphere（34）Hundreds thousand of times are inside increased, Optical Microsphere（34）Refractive index with temperature slight change
Detectable response with regard to optical signal can be caused.
4. tip according to claim 3 is packaged with the high sensitivity optical fiber thermoprobe of Optical Microsphere, it is characterised in that
The Optical Microsphere（34）A diameter of several microns to tens microns, Optical Microsphere（34）For point sensor, point sensor can carry
Rise the three dimensions resolution ratio of temperature survey, Optical Microsphere（34）The local temperature change of measurement can be accurately positioned.
5. tip according to claim 4 is packaged with the high sensitivity optical fiber thermoprobe of Optical Microsphere, it is characterised in that
The Optical Microsphere（34）Produced in batches using Liquid injection cooling or collosol and gel.
6. tip according to claim 1 is packaged with the high sensitivity optical fiber thermoprobe of Optical Microsphere, it is characterised in that
The scattering point（35）For point defect or nanometer scattering particles, scattering point（35）Light is scattered to surrounding；Because Purcell effect,
By scattering point（35）When the incident light frequency scattered meets with microcavity mode frequency, most scattering light will be entered by scattering
Optical Microsphere（34）In.
7. tip according to claim 1 is packaged with the high sensitivity optical fiber thermoprobe of Optical Microsphere, it is characterised in that
The beam expansion device（31）Padded for optical fiber（311）, condenser lens（32）For optical fiber lens（321）.
8. the high sensitivity optical fiber thermometric that the tip according to any one in claim 4-7 is packaged with Optical Microsphere is visited
Pin, it is characterised in that its course of work is：Optical fiber（2）The light beam launched of end face padded in optical fiber（311）Middle one section of transmission
It is extended to after distance close to optical fiber lens（321）Bore, the divergent beams after extension pass through optical fiber lens（321）It is poly-
Jiao invests band scattering point（35）Optical Microsphere（34）；Project Optical Microsphere（34）Light beam on surface passes through Optical Microsphere
（34）The secondary focusing of itself accurately converges to Optical Microsphere（34）The scattering point of top end surface（35）On, scattering point（35）By light
Scattered to surrounding；Because of Purcell effect, incident light frequency and Optical Microsphere（34）Microcavity resonant frequency be consistent, it is most dissipate
Penetrate light and Optical Microsphere is entered by scattering（34）In；Because light path is reversible, Optical Microsphere（34）Resonance signal light through dissipating
Exit point（35）By optical fiber lens after scattering（321）Padded with optical fiber（311）It is back to the optical fiber of input（2）, so as to be collected
And analysis.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711315945.2A CN107796532A (en) | 2017-12-12 | 2017-12-12 | A kind of tip is packaged with the high sensitivity optical fiber thermoprobe of Optical Microsphere |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711315945.2A CN107796532A (en) | 2017-12-12 | 2017-12-12 | A kind of tip is packaged with the high sensitivity optical fiber thermoprobe of Optical Microsphere |
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| Publication Number | Publication Date |
|---|---|
| CN107796532A true CN107796532A (en) | 2018-03-13 |
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| CN201711315945.2A Withdrawn CN107796532A (en) | 2017-12-12 | 2017-12-12 | A kind of tip is packaged with the high sensitivity optical fiber thermoprobe of Optical Microsphere |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109009429A (en) * | 2018-06-19 | 2018-12-18 | 华科精准（北京）医疗科技有限公司 | device for laser ablation |
| CN110987229A (en) * | 2019-12-20 | 2020-04-10 | 西安工业大学 | Optical fiber end face type Fabry-Perot cavity temperature sensor |
| CN112702114A (en) * | 2020-12-16 | 2021-04-23 | 上海交通大学 | Device for acquiring optical fiber side scattering signals and detection method |
| CN113037238A (en) * | 2021-05-08 | 2021-06-25 | 南开大学 | Packaging structure and packaging method of filter based on WGM microcavity |
| US11835393B2 (en) | 2018-02-19 | 2023-12-05 | Washington University | Microprobe |
-
2017
- 2017-12-12 CN CN201711315945.2A patent/CN107796532A/en not_active Withdrawn
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11835393B2 (en) | 2018-02-19 | 2023-12-05 | Washington University | Microprobe |
| CN109009429A (en) * | 2018-06-19 | 2018-12-18 | 华科精准（北京）医疗科技有限公司 | device for laser ablation |
| CN110987229A (en) * | 2019-12-20 | 2020-04-10 | 西安工业大学 | Optical fiber end face type Fabry-Perot cavity temperature sensor |
| CN112702114A (en) * | 2020-12-16 | 2021-04-23 | 上海交通大学 | Device for acquiring optical fiber side scattering signals and detection method |
| CN113037238A (en) * | 2021-05-08 | 2021-06-25 | 南开大学 | Packaging structure and packaging method of filter based on WGM microcavity |
| CN113037238B (en) * | 2021-05-08 | 2024-05-14 | 南开大学 | Packaging structure and packaging method of filter based on WGM microcavity |
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Application publication date: 20180313 |
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