CN107764775A - A kind of index sensor based on U-shaped drawing cone single mode multimode single-mode fiber structure - Google Patents
A kind of index sensor based on U-shaped drawing cone single mode multimode single-mode fiber structure Download PDFInfo
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- CN107764775A CN107764775A CN201710975591.8A CN201710975591A CN107764775A CN 107764775 A CN107764775 A CN 107764775A CN 201710975591 A CN201710975591 A CN 201710975591A CN 107764775 A CN107764775 A CN 107764775A
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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
- G01N21/45—Refractivity; Phase-affecting properties, e.g. optical path length using interferometric methods; using Schlieren methods
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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
- G01N21/45—Refractivity; Phase-affecting properties, e.g. optical path length using interferometric methods; using Schlieren methods
- G01N2021/458—Refractivity; Phase-affecting properties, e.g. optical path length using interferometric methods; using Schlieren methods using interferential sensor, e.g. sensor fibre, possibly on optical waveguide
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2201/00—Features of devices classified in G01N21/00
- G01N2201/08—Optical fibres; light guides
- G01N2201/088—Using a sensor fibre
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Abstract
The present invention relates to a kind of based on the U-shaped new index sensor for drawing cone single mode-multi-mode-single mode optical fiber structure, using single mode-multi-mode-single mode optical fiber structure as basic sensing element, drawing cone is carried out to multimode fibre using flame scanning method, and bend it into U-shaped, by measuring the offset of the interference peaks wave trough position caused by extraneous variations in refractive index, the sensing to extraneous medium refraction index is realized.The present invention has played the sensitiveness for drawing that evanscent field changes to outside medium refraction index in cone and multimode fibre after bending, with higher refractometry sensitivity, and with size is compact, preparation technology is simple, is easy to be connected with other optical fiber components and the advantages such as cost is low, it can be widely applied to the fields such as chemistry and bio-sensing.
Description
Technical field
The present invention relates to the technical field of fibre optical sensor, and in particular to one kind bores single mode-multimode-mono- based on U-shaped draw
The index sensor of mode fiber structure, to developing highly sensitive optic fibre refractive index sensor and its application in small space
Have great significance and be worth, have extensive development prospect in chemistry and bio-sensing field.
Background technology
Refractive index sensing is all particularly significant in the multiple fields such as chemistry and biologic medical, and with the development of science and technology, doubling
The performance of rate sensor is penetrated, especially in terms of miniaturization, high sensitivity, it is proposed that higher requirement.Optical fibre refractivity senses
Device small volume, anti-electromagnetic interference capability are strong, become study hotspot.Currently used optical fiber structure includes Mach Zehnder interferometry
Structure, method Fabry-Parot interferent structure, Bragg grating, long-period gratings, surface plasma and single mode-multi-mode-single mode (SMS) light
Fine structure etc..Wherein, single mode-multi-mode-single mode optical fiber structure has high sensitivity, compact-sized, making is simple, cost is low etc.
Advantage, get the attention.In refractive index sensing, it is desirable to which transmission light and extraneous medium fully act on, therefore general use
The method of hydrofluoric acid corrosion gets rid of the covering of multimode fibre, to ensure that core mode and extraneous medium contact.But this method operates
Danger, and the optical fiber surface after corrosion is rough, easily produces loss.In order to avoid using hydrofluoric acid, there is researcher's proposition
It is a kind of to draw cone single mode-multi-mode-single mode (STMS) optical fiber structure to carry out refractive index sensing.STMS fibre optical sensors are defeated by one
Enter single-mode fiber, a tapered multimode fiber and an output single-mode fiber composition.After drawing cone due to multimode fibre, area's covering is bored
Disappear, the enhancing of evanscent field energy, fully can be acted on extraneous medium, so as to improve sensitivity.It is but larger in order to obtain
Variations in refractive index increases device volume, it is necessary to longer one section of multimode fibre is placed in surrounding medium.Therefore, there is an urgent need to
Develop that a kind of small volume, manufacture craft be simple, novel optical fiber index sensor of high sensitivity is to meet application demand.
The content of the invention
The technical problem to be solved in the present invention is：It is proposed a kind of based on U-shaped drawing cone single mode-multi-mode-single mode optical fiber structure
Index sensor, there is high sensitivity, small volume, prepare the characteristics such as simple and cost is low.Present invention also offers institute
State general principle and working method based on the U-shaped index sensor for drawing and boring single mode-multi-mode-single mode optical fiber structure.
The present invention solve the technical scheme that uses of above-mentioned technical problem for：
A kind of index sensor based on U-shaped drawing cone single mode-multi-mode-single mode optical fiber structure, including Amplified Spontaneous spoke
Penetrate (Amplified Spontaneous Emission, abbreviation ASE) wide spectrum light source, U-shaped draw bores single mode-multi-mode-single mode light
Fibre probe and spectroanalysis instrument.Described U-shaped drawing cone single mode-multi-mode-single mode fibre-optical probe includes input/output single-mode optics
Fibre, bend to U-shaped drawing cone multimode fibre and fixed plate；
Described ASE wide spectrum light sources, U-shaped drawing cone single mode-multi-mode-single mode fibre-optical probe and spectroanalysis instrument forms one
Miniature fiber index sensor, input single-mode fiber, multimode fibre and output single-mode fiber welding are integrated, drawn curved again after boring
Song is positioned over fixed plate for U-shaped entirety and is fixed by UV glue, forms U-shaped draw and bores single mode-multi-mode-single mode fibre-optical probe.ASE
Wide spectrum light source output light draws cone single mode-multi-mode-single mode fibre-optical probe to U-shaped, more in the drawing of input single-mode fiber and bending cone
Mode fiber fusion point, inspire a series of high-order modes and transmitted in the drawing cone multimode fibre of bending, and part light is with evanscent field
Form is present.Multimode fibre fusion point is bored in the drawing of output single-mode fiber and bending, multiple-mode interfence, shape can occur between high-order mode
Into multiple-mode interfence peak, and it is re-coupled in single-mode fiber, is transferred in spectroanalysis instrument, obtains carrying multiple-mode interfence information
Transmission spectrum.Light existing in the form of evanscent field can interact with extraneous medium, cause the ripple at multiple-mode interfence peak
Paddy position drifts about with extraneous medium variations in refractive index.Pass through the interference peaks trough position of the transmission spectrum in measure spectrum analyzer
Put the sensing that external boundary's medium refraction index can be achieved.
The wave-length coverage of described ASE wide spectrum light sources is 1200-1700nm, and the operation wavelength one of optical fiber used in sensor
Cause.
Described SMS samples are that one section of Stepped-index multimode fibre of welding forms among two section single-mould fibers.It is more
Mode fiber length can form multiple-mode interfence, be produced from image phenomenon, such as select multimode fibre 43mm length.Numerical aperture is
0.22, core diameter is 105 μm, and cladding diameter is 125 μm.
Diameter is about 30 μm after the multimode fibre of described U-shaped drawing cone single mode-multi-mode-single mode fibre-optical probe draws cone.
The bending radius of described U-shaped drawing cone single mode-multi-mode-single mode fibre-optical probe is about 2mm.
The fixed plate material of described U-shaped drawing cone single mode-multi-mode-single mode fibre-optical probe is quartz, size is 10 × 5 ×
1mm3, it is easy to encapsulate.
Described U-shaped drawing cone single mode-multi-mode-single mode fibre-optical probe is fixed using UV glue, prevents the factors such as vibration, deformation
Measurement is had an impact.
Described extraneous medium is liquid solution of the ranges of indices of refraction in 1.3-1.4.
Described U-shaped drawing cone single mode-multi-mode-single mode fibre-optical probe is completely immersed in extraneous medium, and is directly connect with the medium
Touch.
In addition, the present invention provides a kind of index sensor based on U-shaped drawing cone single mode-multi-mode-single mode optical fiber structure,
The measurement of extraneous medium refractive index is realized according to following method of work：
Using the multiple-mode interfence in the index sensor based on U-shaped drawing cone single mode-multi-mode-single mode optical fiber structure by outer
The characteristic that boundary medium refraction index influences, the refraction of extraneous medium is obtained by measuring in transmission spectrum interference peaks wavelength shift
Rate.
Wave-length coverage be 1200-1700nm light from ASE wide spectrum light sources 1 output after enter it is U-shaped draw bore single mode-multimode-
Single-mode fiber probe 2.When light enters multimode fibre 5 by input single-mode fiber 4, a series of high-order modes can be inspired, in bending
Draw in cone multimode fibre 5, part light is transmitted in the form of evanscent field.It is molten in the drawing of output single-mode fiber 6 and bending cone multimode fibre 5
Contact, high-order mode produces multiple-mode interfence, and is re-coupled in single-mode fiber 6, and spectrum analysis is transferred to via output optical fibre 10
In instrument 3, obtain carrying the transmission spectrum of multiple-mode interfence information.Passed in the drawing cone multimode fibre 5 of bending in the form of evanscent field
It defeated part light, will directly contact with extraneous medium, and be interacted with extraneous medium, and cause extraneous medium refractive index
During change, drift occurs in the wave trough position at the multiple-mode interfence peak in the transmission spectrum that spectroanalysis instrument 3 measures.So as to logical
The interference peaks wave trough position for the transmission spectrum crossed in measure spectrum analyzer 3 realizes the sensing to extraneous medium refraction index, i.e., logical
Cross measurement interference peaks trough drift value and obtain the refractive index of extraneous medium.
The principle of the present invention：The present invention is by using based on the U-shaped refraction for drawing cone single mode-multi-mode-single mode optical fiber structure
The characteristic that multiple-mode interfence in rate sensor is influenceed by extraneous medium refractive index, to realize the measurement to extraneous medium refraction index.
When light enters multimode fibre from the single-mode fiber of incidence end, many high-order modes will be inspired at the fusing point of single mode-multimode
Formula, these patterns can interfere each other, cause light intensity to strengthen or weaken along optical transmission direction, periodic distribution is presented,
Light intensity on some positions is even almost identical with incident field, equivalent to the reproduction of incident field, goes out in this position welding
The single-mode fiber penetrated, light will be coupled back into single-mode fiber again, both carried multiple-mode interfence information and small transmission light is lost
Spectrum.Multimode fibre is drawn after boring and bending, part light will be transmitted in the form of evanscent field in multimode fibre, can be situated between with the external world
Matter interacts.When the refractive index of extraneous medium changes, and each mode response of evanscent field of its interaction
Difference, the effective refractive index difference between two patterns accordingly change, and cause the wavelength at multiple-mode interfence peak with extraneous refractive index
Change produces drift, so as to realize the sensing of refractive index by measuring the wavelength shift of interference peaks.
The present invention compared with prior art the advantages of be：
(1), the present invention will draw single mode-multi-mode-single mode optical fiber structure after boring to bend, and whole optical fiber can be caused to reflect
Rate sensor bulk is smaller, more compact structure, expands application；
(2), the present invention, which combines, bends and draws cone technology, greatly strengthen in single mode-multi-mode-single mode optical fiber structure suddenly
Die field intensity, can effectively solve the contradiction of sensitivity and sensor bulk, improves the performance of optic fibre refractive index sensor.
Brief description of the drawings
Fig. 1 is the structure chart of the present invention；
Fig. 2 is that the structure chart of single mode-multi-mode-single mode fibre-optical probe is bored in the U-shaped drawing of the present invention；
Reference lists as follows：1-ASE wide spectrum light sources, 2-U types draw cone single mode-multi-mode-single mode fibre-optical probe, 3- light
Analyzer is composed, 4- inputs single-mode fiber, the drawing cone multimode fibre that 5- is bent, 6- output single-mode fibers, 7- fixed plates, 8-UV glue,
9- input optical fibres, 10- output optical fibres
Embodiment
Below in conjunction with the accompanying drawings and embodiment further illustrates the present invention.
As shown in figure 1, it is a kind of based on the U-shaped index sensor for drawing cone single mode-multi-mode-single mode optical fiber structure, including
ASE wide spectrum light sources 1, it is U-shaped to draw cone single mode-multi-mode-single mode fibre-optical probe 2, spectroanalysis instrument 3, input optical fibre 9 and output light
Fibre 10.As shown in Fig. 2 described U-shaped drawing cone single mode-multi-mode-single mode fibre-optical probe 2 includes input single-mode fiber 4, the drawing of bending
Bore multimode fibre 5, output single-mode fiber 6, fixed plate 7 and two pieces of UV glue 8；Wherein input single-mode fiber 4, the drawing cone multimode of bending
Optical fiber 5 and output the welding of single-mode fiber 6 be integrated, then be bent into it is U-shaped be positioned in fixed plate 7, be fixed by UV glue 8.
The wave-length coverage of described ASE wide spectrum light sources 1 is 1200-1700nm, and the operation wavelength of optical fiber used in sensor
Unanimously.
Described U-shaped drawing cone single mode-multi-mode-single mode fibre-optical probe 2 is in input single-mode fiber 4 and output single-mode fiber
The drawing cone multimode fibre 5 of 6 middle welding bendings forms.Multimode fibre length can form multiple-mode interfence, be produced from image phenomenon,
Multimode fibre 43mm is such as selected to grow.Numerical aperture is 0.22, and core diameter is 105 μm, and cladding diameter is 125 μm.
The cone area diameter of the drawing cone multimode fibre 5 of described bending is about 30 μm.
The bending radius of described U-shaped drawing cone single mode-multi-mode-single mode fibre-optical probe 2 is about 2mm.
The described material of fixed plate 7 is quartz, and size is 10 × 5 × 1mm3, it is easy to encapsulate.
Described U-shaped drawing cone single mode-multi-mode-single mode fibre-optical probe 2 is fixed using UV glue 8, prevent vibration, deformation etc. because
Element has an impact to measurement.
The light that wave-length coverage is 1200-1700nm passes through after the output of ASE wide spectrum light sources is bored by input optical fibre 9 into U-shaped draw
Single mode-multi-mode-single mode fibre-optical probe 2, light are bored the fusion point of multimode fibre 5 in the drawing of input single-mode fiber 4 and bending, can excited
Go out a series of high-order modes, transmitted in the drawing cone multimode fibre 5 of bending, and part light is evanscent field form, in output single-mode optics
The fusion point of multimode fibre 5 is bored in the drawing of fibre 6 and bending, and multiple-mode interfence can occur between high-order mode, form multiple-mode interfence peak, and again
It is coupled into single mode to transmit in single-mode fiber 6 is exported, via being transferred in spectroanalysis instrument 3 in output optical fibre 10.With evanscent field
The light of transmission will interact with extraneous medium, when causing extraneous medium variations in refractive index, the trough position at multiple-mode interfence peak
Put and drift occurs, it is outer so as to be obtained by the interference peaks trough drift value of the transmission spectrum in measure spectrum analyzer 3
The refractive index of boundary's medium.
Extraneous medium refractive index is measured based on the U-shaped index sensor for drawing cone single mode-multi-mode-single mode optical fiber structure
Method of work is mainly：
Using the multiple-mode interfence in the index sensor based on U-shaped drawing cone single mode-multi-mode-single mode optical fiber structure by outer
The characteristic that boundary medium refraction index influences, the refraction of extraneous medium is obtained by measuring in transmission spectrum interference peaks wavelength shift
Rate.
Wave-length coverage be 1200-1700nm light from ASE wide spectrum light sources 1 output after enter it is U-shaped draw bore single mode-multimode-
Single-mode fiber probe 2.When light enters multimode fibre 5 by input single-mode fiber 4, a series of high-order modes can be inspired, in bending
Draw in cone multimode fibre 5, part light is transmitted in the form of evanscent field.It is molten in the drawing of output single-mode fiber 6 and bending cone multimode fibre 5
Contact, high-order mode produces multiple-mode interfence, and is re-coupled in single-mode fiber 6, and spectrum analysis is transferred to via output optical fibre 10
In instrument 3, obtain carrying the transmission spectrum of multiple-mode interfence information.Passed in the drawing cone multimode fibre 5 of bending in the form of evanscent field
It defeated part light, will directly contact with extraneous medium, and be interacted with extraneous medium, and cause extraneous medium refractive index
During change, drift occurs in the wave trough position at the multiple-mode interfence peak in the transmission spectrum that spectroanalysis instrument 3 measures.So as to logical
The interference peaks wave trough position for the transmission spectrum crossed in measure spectrum analyzer 3 realizes the sensing to extraneous medium refraction index, i.e., logical
Cross measurement interference peaks trough drift value and obtain the refractive index of extraneous medium.
The content not being described in detail in description of the invention belongs to prior art known to professional and technical personnel in the field.
Although the illustrative embodiment of the present invention is described above, this is understood in order to the technical staff of this technology neck
Invention, it should be apparent that the invention is not restricted to the scope of embodiment, those skilled in the art are come
Say, as long as various change, in the spirit and scope of the present invention that appended claim limits and determines, these changes are aobvious
And be clear to, all are using the innovation and creation of present inventive concept in the row of protection.
Claims (5)
- It is 1. a kind of based on the U-shaped index sensor for drawing cone single mode-multi-mode-single mode optical fiber structure, it is characterised in that：Including one Individual amplified spontaneous emission wide spectrum light source (1), U-shaped draws bore single mode-multi-mode-single mode fibre-optical probe (2), a spectrum analysis Instrument (3), input optical fibre (9) and output optical fibre (10)；Described U-shaped drawing cone single mode-multi-mode-single mode fibre-optical probe (2) includes an input single-mode fiber (4), a bending Drawing cone multimode fibre (5), output single-mode fiber (6), one piece of fixed plate (7) and two pieces of UV glue (8)；Wherein input single mode Optical fiber (4), the drawing cone multimode fibre (5) of bending and output single-mode fiber (6) welding are integrated, then are bent into U-shaped be positioned over admittedly On fixed board (7), it is fixed by UV glue (8)；The light that wide spectrum light source (1) output is penetrated by Amplified Spontaneous enters U-shaped drawing cone single mode-multi-mode-single mode light via input optical fibre (9) Fibre probe (2), in the fusion point of the drawing of input single-mode fiber (4) and bending cone multimode fibre (5), a series of high-orders can be inspired Mould, in the drawing cone multimode fibre (5) of bending, and part light is transmitted in the form of evanscent field；In output single-mode fiber (6) and curved The fusion point of multimode fibre (5) is bored in bent drawing, and multiple-mode interfence can occur between high-order mode, forms multiple-mode interfence peak, and coupling again Synthesize single mode to transmit in output single-mode fiber (6), be transferred in spectroanalysis instrument (3) and carried via output optical fibre (10) The transmission spectrum of multiple-mode interfence information；The part light transmitted in drawing cone multimode fibre (5) of bending in the form of evanscent field, can be with Directly contact, and interact with extraneous medium, when causing the refractive index of extraneous medium to change, spectroanalysis instrument (3) wave trough position at the multiple-mode interfence peak in the transmission spectrum measured will appear from drifting about；By being passed in measure spectrum analyzer (3) Lose sensing of the interference peaks wave trough position realization to extraneous medium refraction index of spectrum.
- 2. the index sensor according to claim 1 based on U-shaped drawing cone single mode-multi-mode-single mode optical fiber structure, its It is characterised by：Described amplified spontaneous emission wide spectrum light source (1) wave-length coverage is 1200-1700nm, is kept and optical fiber used Operation wavelength is consistent.
- 3. the index sensor according to claim 1 based on U-shaped drawing cone single mode-multi-mode-single mode optical fiber structure, its It is characterised by：Using heat sealing machine, one section of multimode fibre of welding, two section single-mould fibers form defeated respectively among two section single-mould fibers Enter single-mode fiber (4) and output single-mode fiber (6), multimode fibre bores multimode fibre (5) for the drawing of bending.
- 4. the index sensor according to claim 1 based on U-shaped drawing cone single mode-multi-mode-single mode optical fiber structure, its It is characterised by：The drawing cone multimode fibre (5) of the bending is Stepped-index multimode fibre, numerical aperture 0.22, fibre core A diameter of 105 μm, cladding diameter is 125 μm.
- 5. the index sensor according to claim 1 based on U-shaped drawing cone single mode-multi-mode-single mode optical fiber structure, its It is characterised by：The index sensor of described U-shaped drawing cone single mode-multi-mode-single mode optical fiber structure is integrally fastened to fixed plate (7), hanging wherein at fibre-optical probe, fixed plate (7) material is quartz.
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| CN201710975591.8A CN107764775A (en) | 2017-10-18 | 2017-10-18 | A kind of index sensor based on U-shaped drawing cone single mode multimode single-mode fiber structure |
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| CN201710975591.8A CN107764775A (en) | 2017-10-18 | 2017-10-18 | A kind of index sensor based on U-shaped drawing cone single mode multimode single-mode fiber structure |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108519126A (en) * | 2018-05-04 | 2018-09-11 | 天津理工大学 | The sensor of multi parameter simultaneous measuring based on multimode and wimble structure |
| CN110389113A (en) * | 2019-08-30 | 2019-10-29 | 河南师范大学 | A method of coreless fiber structure measurement refractive index is cascaded using broken line type tapered multimode fiber |
| CN110411603A (en) * | 2019-08-30 | 2019-11-05 | 河南师范大学 | A method of coreless fiber structure measurement temperature is cascaded using broken line type tapered multimode fiber |
| CN111504946A (en) * | 2020-04-10 | 2020-08-07 | 天津大学 | Preparation method of single-mode-multi-mode-single-mode structure flexible refractive index sensor |
| CN112432912A (en) * | 2020-11-19 | 2021-03-02 | 哈尔滨理工大学 | Optical fiber ultraviolet sensing device based on interference array and implementation method |
| CN112833928A (en) * | 2020-12-31 | 2021-05-25 | 桂林电子科技大学 | Cascade macrobend and alternative single mode-multimode fiber structure temperature refractive index sensor |
| CN114235755A (en) * | 2021-12-18 | 2022-03-25 | 桂林电子科技大学 | Point type measurement SPR sensor based on U-shaped conical plastic optical fiber |
| CN115693372A (en) * | 2023-01-05 | 2023-02-03 | 济南邦德激光股份有限公司 | Fiber laser capable of suppressing Raman scattering and method |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108519126A (en) * | 2018-05-04 | 2018-09-11 | 天津理工大学 | The sensor of multi parameter simultaneous measuring based on multimode and wimble structure |
| CN110389113A (en) * | 2019-08-30 | 2019-10-29 | 河南师范大学 | A method of coreless fiber structure measurement refractive index is cascaded using broken line type tapered multimode fiber |
| CN110411603A (en) * | 2019-08-30 | 2019-11-05 | 河南师范大学 | A method of coreless fiber structure measurement temperature is cascaded using broken line type tapered multimode fiber |
| CN111504946A (en) * | 2020-04-10 | 2020-08-07 | 天津大学 | Preparation method of single-mode-multi-mode-single-mode structure flexible refractive index sensor |
| CN112432912A (en) * | 2020-11-19 | 2021-03-02 | 哈尔滨理工大学 | Optical fiber ultraviolet sensing device based on interference array and implementation method |
| CN112432912B (en) * | 2020-11-19 | 2021-09-24 | 哈尔滨理工大学 | Optical fiber ultraviolet sensing device based on interference array and implementation method |
| CN112833928A (en) * | 2020-12-31 | 2021-05-25 | 桂林电子科技大学 | Cascade macrobend and alternative single mode-multimode fiber structure temperature refractive index sensor |
| CN112833928B (en) * | 2020-12-31 | 2022-12-06 | 桂林电子科技大学 | Cascade macrobend and alternative single mode-multimode fiber structure temperature refractive index sensor |
| CN114235755A (en) * | 2021-12-18 | 2022-03-25 | 桂林电子科技大学 | Point type measurement SPR sensor based on U-shaped conical plastic optical fiber |
| CN115693372A (en) * | 2023-01-05 | 2023-02-03 | 济南邦德激光股份有限公司 | Fiber laser capable of suppressing Raman scattering and method |
| CN115693372B (en) * | 2023-01-05 | 2023-09-22 | 济南邦德激光股份有限公司 | Fiber laser and method capable of inhibiting Raman scattering |
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