CN208672522U - A kind of index sensor based on micro-nano fiber and end face reflection - Google Patents
A kind of index sensor based on micro-nano fiber and end face reflection Download PDFInfo
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- CN208672522U CN208672522U CN201821261257.2U CN201821261257U CN208672522U CN 208672522 U CN208672522 U CN 208672522U CN 201821261257 U CN201821261257 U CN 201821261257U CN 208672522 U CN208672522 U CN 208672522U
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Abstract
The utility model discloses a kind of index sensor based on micro-nano fiber and end face reflection, it include: laser light source, light power meter, coupler, micro-nano fiber, base station, the connection of the input port of the laser light source and coupler, first output port of the coupler is connect with light power meter, the base station is for placing testing liquid, the micro-nano fiber is fixed on base station, one end face of the micro-nano fiber is contacted with testing liquid, and the other end of the micro-nano fiber and the second output terminal mouth of coupler connect.Have the characteristics that evanscent field is big using micro-nano fiber, Fresnel reflection occurs in the end face of micro-nano fiber by laser, generates evanescent wave, the refractive index of testing liquid is calculated by light power meter, it is simple relative to existing apparatus structure, it can be used for the measurement of liquid refractivity.
Description
Technical field
The invention is related to optical technical field, in particular to a kind of laser beam emitting device.
Background technique
The refractive index of substance is an important basic physical parameter, it is able to reflect some internal informations of substance, such as
Refractive nature, density etc..Secondly, refractive index and some other parameters are as content of material, component or concentration etc. are positively correlated
Relationship, thus these associated arguments can be measured indirectly by measurement refractive index.Therefore to the measurement of material refractive index numerous
Key areas is widely used.
Loss is small, cheap, is easy to the advantages that producing in batches with it for micro-nano fiber, be widely used in detection, medical treatment,
The every field such as communication, play indispensable role.In recent years, since micro-nano fiber has evanscent field big, high non-linearity
The advantages that, it is more and more to study the refractive index direction for applying it to measurement of species.Such as it is humorous based on micro-nano fiber annular
Humidity sensor, the junction type index sensor based on micro-nano fiber etc. of vibration chamber, these sensor bulks are larger, preparation is not simple
List, design are not flexible.
Utility model content
The purpose of this utility model is: providing a kind of index sensor of structure simply based on wiener optical fiber.
The solution that the utility model solves its technical problem is: a kind of refraction based on micro-nano fiber and end face reflection
Rate sensor, comprising: laser light source, light power meter, coupler, micro-nano fiber, base station, the laser light source and coupler it is defeated
Inbound port connection, the first output port of the coupler are connect with light power meter, and the base station is for placing testing liquid, institute
Micro-nano fiber is stated to be fixed on base station, an end face of the micro-nano fiber is contacted with testing liquid, the micro-nano fiber it is another
The connection of the second output terminal mouth of end face and coupler.
Further, the wavelength of the laser light source is 1550nm.
Further, the base station is in the form of slot.
Further, the diameter of the micro-nano fiber is 0.5-3.0 μm.
The beneficial effects of the utility model are: having the characteristics that evanscent field is big using micro-nano fiber, by laser in micro-nano
Fresnel reflection occurs for the end face of optical fiber, generates evanescent wave, the refractive index of testing liquid is calculated by light power meter, relatively
It is simple in existing apparatus structure.
Detailed description of the invention
It, below will be to required in embodiment description in order to illustrate more clearly of the technical scheme in the embodiment of the utility model
Attached drawing to be used is briefly described.Obviously, described attached drawing is a part of the embodiment of the utility model, rather than complete
Portion's embodiment, those skilled in the art without creative efforts, can also be obtained according to these attached drawings it
His design scheme and attached drawing.
Fig. 1 is the structural schematic diagram of the invention sensor.
Specific embodiment
It is carried out below with reference to technical effect of the embodiment and attached drawing to the design of the utility model, specific structure and generation
It clearly and completely describes, to be completely understood by the purpose of this utility model, feature and effect.Obviously, described embodiment
It is a part of the embodiment of the utility model, rather than whole embodiments, it is based on the embodiments of the present invention, the skill of this field
Art personnel other embodiments obtained without creative efforts belong to the model of the utility model protection
It encloses.In addition, all connection/connection relationships being previously mentioned in text, not singly refer to that component directly connects, and referring to can be according to specific reality
Situation is applied, by adding or reducing couple auxiliary, Lai Zucheng more preferably coupling structure.Each technology in the invention is special
Sign, can be with combination of interactions under the premise of not conflicting conflict.
Embodiment 1, with reference to Fig. 1, a kind of index sensor based on micro-nano fiber and end face reflection, comprising: laser light
The input port of source 1, light power meter 2, coupler 3, micro-nano fiber 5, base station 4, the laser light source 1 and coupler 3 passes through light
Fibre connection, the first output port of the coupler 3 are connect with light power meter 2 by optical fiber, and the micro-nano fiber 5 is fixed on base
On platform 4, an end face of the micro-nano fiber 5 is contacted with testing liquid, and the other end of the micro-nano fiber 5 passes through optical fiber and coupling
The second output terminal mouth of clutch 3 connects, and as optimization, the wavelength of the laser light source 1 is 1550nm, the micro-nano fiber 5
Diameter is 0.5-3.0 μm, and the present embodiment is 2.5 μm.
When this working sensor, testing liquid is put on base station 4, the input terminal of the light of laser light source 1 from coupler 3
Mouth input, the first, second output port for passing through coupler 3 export, wherein are sent to micro-nano fiber by second output terminal oral instructions
It in 5, is acted on an end face of micro-nano fiber 5 with testing liquid, Fresnel reflection occurs, generate evanescent wave.Evanescent wave passes through
Micro-nano fiber 5 is exported from the first output port of coupler 3, and the optical power for influencing the first output port of coupler 3 occurs
Variation, the variation are detected by light power meter 2.
According to Fresnel (Fresnel) formula, reflective light intensity Ir, with incident intensity IinRelationship are as follows:Wherein nfAnd nxRespectively optical fiber effective refractive index and testing liquid.Due to the effective refractive index of optical fiber
Be it is known, in combination with the light intensity of the splitting ratio of coupler 3, laser light source 1, reflected light (evanescent wave) can be calculated
The relationship of light intensity and refractive index.To obtain the refractive index of testing liquid.
The refractive index of NaCl solution is detected simultaneously using this sensor and Abbe refractometer, this sensor measurement
The refractive index results of NaCl solution are 1.3500, and the refractive index results of Abbe refractometer measurement are 1.3501, and the two is close, i.e.,
The sensor for demonstrating the invention can detect the refractive index of liquid.It has also been found that can be by reducing micro-nano
The diameter of optical fiber 5 improves the sensitivity of sensor.
As optimization, the base station 4 is in the form of slot, facilitates placement testing liquid.
The better embodiment of the utility model is illustrated above, but the invention be not limited to it is described
Embodiment, those skilled in the art can also make various equivalent changes without departing from the spirit of the present invention
Type or replacement, these equivalent variation or replacement are all included in the scope defined by the claims of the present application.
Claims (4)
1. a kind of index sensor based on micro-nano fiber and end face reflection characterized by comprising laser light source, light function
The input port of rate meter, coupler, micro-nano fiber, base station, the laser light source and coupler connects, and the first of the coupler
Output port is connect with light power meter, and for placing testing liquid, the micro-nano fiber is fixed on base station the base station, described
One end face of micro-nano fiber is contacted with testing liquid, and the other end of the micro-nano fiber and the second output terminal mouth of coupler connect
It connects.
2. a kind of index sensor based on micro-nano fiber and end face reflection according to claim 1, which is characterized in that
The wavelength of the laser light source is 1550nm.
3. a kind of index sensor based on micro-nano fiber and end face reflection according to claim 1, which is characterized in that
The base station is in the form of slot.
4. a kind of index sensor based on micro-nano fiber and end face reflection according to claim 1, which is characterized in that
The diameter of the micro-nano fiber is 0.5-3.0 μm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821261257.2U CN208672522U (en) | 2018-08-06 | 2018-08-06 | A kind of index sensor based on micro-nano fiber and end face reflection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821261257.2U CN208672522U (en) | 2018-08-06 | 2018-08-06 | A kind of index sensor based on micro-nano fiber and end face reflection |
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| Publication Number | Publication Date |
|---|---|
| CN208672522U true CN208672522U (en) | 2019-03-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201821261257.2U Expired - Fee Related CN208672522U (en) | 2018-08-06 | 2018-08-06 | A kind of index sensor based on micro-nano fiber and end face reflection |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109060721A (en) * | 2018-08-06 | 2018-12-21 | 佛山科学技术学院 | A kind of index sensor based on micro-nano fiber and end face reflection |
| CN110160960A (en) * | 2019-06-22 | 2019-08-23 | 南昌航空大学 | Micro-nano fiber biosensor and preparation method thereof based on coupler structure |
-
2018
- 2018-08-06 CN CN201821261257.2U patent/CN208672522U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109060721A (en) * | 2018-08-06 | 2018-12-21 | 佛山科学技术学院 | A kind of index sensor based on micro-nano fiber and end face reflection |
| CN110160960A (en) * | 2019-06-22 | 2019-08-23 | 南昌航空大学 | Micro-nano fiber biosensor and preparation method thereof based on coupler structure |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190329 Termination date: 20200806 |
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| CF01 | Termination of patent right due to non-payment of annual fee |