CN104914501A - Optical fiber condenser and cascading structure constituted by same - Google Patents
Optical fiber condenser and cascading structure constituted by same Download PDFInfo
- Publication number
- CN104914501A CN104914501A CN201510373386.5A CN201510373386A CN104914501A CN 104914501 A CN104914501 A CN 104914501A CN 201510373386 A CN201510373386 A CN 201510373386A CN 104914501 A CN104914501 A CN 104914501A
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- Prior art keywords
- energy
- optical fiber
- transmission optic
- optic fibre
- concentrator
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/04—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings formed by bundles of fibres
Abstract
The invention provides an optical fiber condenser and a cascading structure constituted by the same. The optical fiber condenser includes a plurality of energy transmitting optical fibers, packing medium and a quartz tube. The energy transmitting optical fibers are composed of fiber cores and claddings. The refractive index of the quartz tube is lower than that of the claddings of the energy transmitting optical fibers. The energy transmitting optical fibers are subjected to tapering treatment and are disposed in the quartz tube in a closely distributed manner. The centers of the fiber cores of the energy transmitting optical fibers form a regular triangular mesh net. The distance between the centers of two adjacent energy transmitting optical fibers is equal to the sum of the semi-diameters of the two energy transmitting optical fibers. The gaps between the energy transmitting optical fibers and the quartz tube are filled with the packing medium. Since the optical fiber condenser is subjected to tapering treatment, the inner diameter of the quartz tube at the end face of an output terminal is smaller than or equal to the diameter of the fiber cores of the energy transmitting optical fibers at the input terminal. The optical fiber condenser provided by the invention can improve transmission efficiency, reduce optical fiber end face damage due to too high optical power density of a focusing face and reduce bending loss in an optical fiber energy transmission process.
Description
Technical field
The invention belongs to optical fiber and pass energy field, the cascade structure of especially a kind of optical fiber-concentrator and composition thereof.
Background technology
Sun power, refers to the emittance of sunshine, a kind of emerging regenerative resource, too late, the nexhaustible desirable energy got.But at present, the utilization of sun power is not also very universal, utilizes solar electrical energy generation also to there are the problems such as cost is high, conversion efficiency is low.
The utilization of sun power generally has Passive use (photothermal deformation) and opto-electronic conversion two kinds of modes.Passive use is the new developing direction of Solar use comparatively speaking.And to be coupled in energy-transmission optic fibre by sunshine be a new breakthrough mouth of this technology.But because the fibre core of optical fiber is general less, only has 200 μm ~ 1000 μm, both at home and abroad for the research of sunlight, be usually by beam condensing unit, sunshine to be coupled in optical fiber, then by energy-transmission optic fibre, sunshine be transferred to other equipment.And in this sunlight system, a crucial step utilizes beam condensing unit that sunshine is coupled in energy-transmission optic fibre exactly.
Beam condensing unit generally adopts the form of lens to realize.Obviously, lens sizes is larger, the multiple of optically focused is higher, will more be conducive to more energy accumulating in optical fiber.At present, the light concentrating times preparing superior collector lens can reach 15000 times, and its lens diameter is 95mm, and lens sizes is larger, and manufacture difficulty is also larger, and its light concentrating times should also can decline, simultaneously the too high damage that also can cause optical fiber of focusing surface optical power density.In addition the factor such as mixing of the end face quality of optical fiber, length and the bending pattern that causes and power, has had a strong impact on again it to transfer efficiency and the capacity of assembling sun power.Find out thus, due to the singularity of fiber optic materials, various physical deterioration constrains further developing of energy-transmission optic fibre, also constrains the development that sunshine diameter utilizes energy mode.And this problem does not have good settling mode at present.
Summary of the invention
For Shortcomings in prior art, the invention provides the cascade structure of a kind of optical fiber-concentrator and composition thereof, to reduce the mode of focusing surface optical power density, realize utilizing the high-level efficiency of solar energy, this system adopts multifiber to draw the unitized construction of cone bunchy, and light transmits and is independent of each other mutually in any simple optical fiber.
The present invention realizes above-mentioned technical purpose by following technological means.
A kind of optical fiber-concentrator, comprise many energy-transmission optic fibres, filled media, quartz ampoule, energy-transmission optic fibre is made up of fibre core and covering, the refractive index of described quartz ampoule is lower than the refractive index of described energy-transmitting optical fibers at cladding, described energy-transmission optic fibre is through drawing cone process, described energy-transmission optic fibre is closely arranged in quartz ampoule, many energy-transmission optic fibre core centres form equilateral triangle grid, distance between adjacent two energy-transmission optic fibre centers equals two energy-transmission optic fibre radius sums, between many energy-transmission optic fibres and and quartz ampoule between gap-fill have filled media, described optical fiber-concentrator makes the internal diameter of output terminal end face quartz ampoule be less than or equal to the core diameter of the energy-transmission optic fibre of input end through drawing cone process.
Preferably, drawing between cone length L and quartz ampoule external diameter R of described optical fiber-concentrator meets: L/R >=5.
Preferably, described filled media is quartz medium post or energy-transmission optic fibre.
Preferably, the quantity of described energy-transmission optic fibre is more than or equal to 7.
Preferably, the fiber core radius r of described energy-transmission optic fibre
owith cladding radius r
cratio r
o/ r
c>=0.9.
Preferably, the refractive index n of described fibre core
lwith the refractive index n of covering
2difference meet: (n
1 2-n
2 2)≤0.040.
Preferably, the incident light cone angle maximal value β scope of described energy-transmission optic fibre end face: 2 α+1.6 °≤β≤2 α-3.8 °, wherein, α represents the angle of central axis and incident light, α=arcsin (NA), and wherein NA is fiber numerical aperture.
The cascade structure of described optical fiber-concentrator composition, comprise multistage condenser system, described condenser system is made up of multiple optical fiber-concentrator, and the described condenser outlet in upper level condenser system is connected with an energy-transmission optic fibre of the described condenser input end in its next stage condenser system respectively.
Technique effect of the present invention: optical fiber-concentrator adopts the mode of many energy-transmission optic fibre combinations, expands face area, improves the loss threshold value of end face, thus improves transfer efficiency; The company's of the subsides combination mutually of energy-transmission optic fibre in optical fiber-concentrator, when its optical fiber passes energy beam bending, light can not be refracted in covering and finally leak away, and reduces bending loss; Energy-transmission optic fibre in optical fiber-concentrator is generally quartz material, draws cone simple, easily processes, add its practicality.The present invention can form cascade structure in addition, realizes the light of multiple optical fiber-concentrator to assemble into another optical fiber-concentrator, thus increases optically focused energy exponentially.Based on this, the present invention applies to, in sunlight system, can improve transfer efficiency, reduces the fiber end face damage caused because focusing surface optical power density is too high and the bending loss reduced in optical fiber energy transfer process.
Accompanying drawing explanation
Fig. 1 is optical fiber-concentrator outside drawing of the present invention.
Fig. 2 is optical fiber-concentrator cross section structure figure of the present invention.
Fig. 3 is the structural representation of described energy-transmission optic fibre.
Fig. 4 is the result figure of light tools software simulation.
Fig. 5 is the relation curve drawing cone length and light gathering efficiency.
Fig. 6 is the relation curve of incident light convergence angle and light gathering efficiency.
Fig. 7 is the relation curve of spot size and light gathering efficiency.
In figure:
1-energy-transmission optic fibre, 2-quartz medium post, 3-quartz ampoule, 4-energy-transmission optic fibre fibre core, 5-energy-transmitting optical fibers at cladding, 6-input end, 7-output terminal.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment, the present invention is further illustrated, but protection scope of the present invention is not limited to this.
The object of the invention is the transmission to high power solar energy, reducing the fiber end face damage caused because focusing surface optical power density is too high, is the key improving transfer efficiency.Therefore, 7 identical energy-transmission optic fibres 1 are drawn cone by the present invention, and composition fibre bundle condenser, can expand face area, reduce caustic surface optical power density.After drawing cone, as shown in Figure 1, optical fiber-concentrator defines the output terminal 7 of input end 6, small end face of a large end face.The internal diameter of the output terminal 7 end face quartz ampoule of this optical fiber-concentrator is less than or equal to the core diameter of input end 6 energy-transmission optic fibre, the output terminal 7 of an optical fiber-concentrator is connected with an energy-transmission optic fibre 1 of another optical fiber-concentrator input end 6, form cascade structure, thus converging light is gathered simple optical fiber, be convenient to long apart from high-power transmission.Light beam after lens light gathering, can reenter and be mapped to optical fiber-concentrator end face.
Concrete, the structure of optical fiber-concentrator of the present invention as shown in Figure 2, comprises many energy-transmission optic fibres 1, filled media, quartz ampoule 3.Energy-transmission optic fibre 1 is made up of fibre core 4 and covering 5, as shown in Figure 3, and fibre core 4 radius r of described energy-transmission optic fibre 1
owith covering 5 radius r
cratio r
o/ r
c>=0.9.The refractive index of described quartz ampoule 3 lower than the refractive index of described energy-transmission optic fibre 1 covering 5, the refractive index n of described fibre core 4
lwith the refractive index n of covering 3
2difference meet: (n
1 2-n
2 2)≤0.040.Described energy-transmission optic fibre 1 is through drawing cone process, described energy-transmission optic fibre 1 is closely arranged in quartz ampoule 3, many energy-transmission optic fibre 1 core centres form equilateral triangle grid, and form tight arrangement, the distance namely between adjacent two energy-transmission optic fibre 1 centers equals two energy-transmission optic fibre radius sums.Gap-fill between many energy-transmission optic fibres 1, between energy-transmission optic fibre 1 and quartz ampoule 3 has filled media, to form tight structure, concrete, in the present embodiment, with quartz medium post 2 for filled media.Preferably, described filled media also can adopt energy-transmission optic fibre, to increase light-receiving area, reduces loss.The internal diameter of described optical fiber-concentrator output terminal 77 end face quartz ampoule is less than or equal to the core diameter of the energy-transmission optic fibre 1 of input end 6.
Optical fiber-concentrator of the present invention, carries out parameter simulation with light tools software, and as shown in Figure 4, spot energy distribution is relatively more even, and brightness is large for the analog result obtained.Namely end face loss is low, can realize the high-efficiency transfer of energy-transmission optic fibre.
As shown in Figure 5, along with the increase of drawing cone length L, receiver receives luminous flux and first increases and progressively keep balance again the relation curve drawing the light gathering efficiency of cone length L and optical fiber-concentrator, and namely draw when boring length L long enough, its loss is low.As seen from Figure 5, when drawing cone ratio >=5 of length L with quartz ampoule external diameter R, its luminous flux tends towards stability value, and namely its light gathering efficiency is high.For this reason, require that drawing between cone length L and quartz ampoule external diameter R of described optical fiber-concentrator meets: L/R >=5.
The incident angle β of adjustment energy-transmission optic fibre end face, obtain the relation curve of incident light convergence angle and light gathering efficiency as shown in Figure 6, optically focused angle is between 15 ° ~ 25 °, and light gathering efficiency is higher, and namely optically focused angle is less, and focusing surface optical power density is larger.Theoretical by Optical Fiber Transmission, the angle α=arcsin (NA) of central axis and incident light, wherein NA is fiber numerical aperture.When angle of light is less than incident Critical Light angle, after light enters optical fiber, total internal reflection can be kept to transmit.And if incident angle is greater than incident Critical Light angle, then it easily produces loss.As seen from Figure 6, when incident angle maximal value β is greater than incident Critical Light angle, it still likely keeps low-loss transmission.Because incident angle maximal value β is larger, the luminous flux that Transmission Fibers end face can be assembled is also larger, thus also more easily obtains high power optically focused.Therefore, when optical fiber-concentrator parameter is determined, select suitable β, be necessary.
Can be determined by Fig. 6, the incident light cone angle maximal value β scope of described energy-transmission optic fibre 1 end face: 2 α+1.6 °≤β≤2 α-3.8 °, wherein, α represents the angle of central axis and incident light, α=arcsin (NA), wherein NA is fiber numerical aperture.
Fig. 7 is the relation curve of spot size and light gathering efficiency, and when inputting solar energy and being identical, spot size is larger, and focusing surface optical power density is less, thus end face loss reduces, and light gathering efficiency increases.
Described optical fiber-concentrator composition cascade structure, comprise multistage condenser system, described condenser system is made up of multiple optical fiber-concentrator, described condenser outlet 7 in upper level condenser system is connected with an energy-transmission optic fibre 1 of the described condenser input end in its next stage condenser system respectively, composition multi input end 6 condenser systems.
Transfer efficiency of the present invention is high, end face loss is little, it is simple and easy to process, and can select suitable parameter according to operating bandwidth requirement.According to above structure, enumerate following examples:
Embodiment one:
Energy-transmission optic fibre 1 in optical fiber-concentrator adopts SI type silica clad, its core diameter 400 μm, refractive index n
1be 1.46; Cladding diameter 440 μm, refractive index n
2be 1.446.Input end 6 the place internal diameter 1.35mm of quartz ampoule, output terminal 7 place external diameter 450 μm.Quartz ampoule length is 10mm.The length of energy-transmission optic fibre 1 is identical with the length of quartz ampoule.For the optical fiber-concentrator of above parameter, incident flux is 100lumen, and exit luminous flux is 57.236lumen, and its transfer efficiency is 57.236%.
Embodiment two:
Energy-transmission optic fibre 1 in optical fiber-concentrator adopts SI type silica clad, core diameter 600 μm in its condenser system, refractive index n
1be 1.46; Cladding diameter 660 μm, refractive index n
2be 1.446; Input end 6 the place internal diameter 2mm of its quartz ampoule, quartz ampoule length is 10mm, output terminal 7 place external diameter 580 μm.With the optical fiber-concentrator of the present embodiment for monomer builds cascade structure, in one-level condenser system, the output terminal 7 of each optical fiber-concentrator is connected with the single energy-transmission optic fibre 1 of the optical fiber-concentrator input end 6 of secondary condenser system respectively.The incident flux of first order condenser system is 100lumen, and exit luminous flux is 40.58lumen, and transfer efficiency is 40.58%.Second level condenser system incident flux is 284.06lumen, and exit luminous flux is 109.25lumen, and transfer efficiency is 38.46%.
Above-described embodiment is preferred embodiment of the present invention; but the present invention is not limited to above-mentioned embodiment; when not deviating from flesh and blood of the present invention, any apparent improvement that those skilled in the art can make, replacement or modification all belong to protection scope of the present invention.
Claims (8)
1. an optical fiber-concentrator, it is characterized in that, comprise many energy-transmission optic fibres (1), filled media, quartz ampoule (3), energy-transmission optic fibre (1) is made up of fibre core (4) and covering (5), the refractive index of described quartz ampoule (3) is lower than the refractive index of described energy-transmission optic fibre (1) covering (5), described energy-transmission optic fibre (1) is through drawing cone process, described energy-transmission optic fibre (1) is closely arranged in quartz ampoule (3), many energy-transmission optic fibre (1) core centres form equilateral triangle grid, distance between adjacent two energy-transmission optic fibre (1) centers equals two energy-transmission optic fibre radius sums, between many energy-transmission optic fibres (1) and and quartz ampoule (3) between gap-fill have filled media, the internal diameter of described optical fiber-concentrator output terminal (7) end face quartz ampoule is less than or equal to the core diameter of the energy-transmission optic fibre (1) of input end (6).
2. optical fiber-concentrator according to claim 1, is characterized in that, drawing between cone length L and quartz ampoule external diameter R of described optical fiber-concentrator meets: L/R >=5.
3. optical fiber-concentrator according to claim 1, is characterized in that, described filled media is quartz medium post (2) or energy-transmission optic fibre.
4. optical fiber-concentrator according to claim 1, is characterized in that, the quantity of described energy-transmission optic fibre (1) is more than or equal to 7.
5. optical fiber-concentrator according to claim 1, is characterized in that, fibre core (4) radius r of described energy-transmission optic fibre (1)
owith covering (5) radius r
cratio r
o/ r
c>=0.9.
6. optical fiber-concentrator according to claim 1, is characterized in that, the refractive index n of described fibre core (4)
lwith the refractive index n of covering (3)
2difference meet: (n
1 2-n
2 2)≤0.040.
7. optical fiber-concentrator according to claim 1, it is characterized in that, the incident light cone angle maximal value β scope of described energy-transmission optic fibre (1) end face: 2 α+1.6 °≤β≤2 α-3.8 °, wherein, α represents the angle of central axis and incident light, α=arcsin (NA), wherein NA is fiber numerical aperture.
8. the cascade structure of optical fiber-concentrator composition according to claim 1, it is characterized in that, comprise multistage condenser system, described condenser system is made up of multiple optical fiber-concentrator, and the described condenser outlet (7) in upper level condenser system is connected with an energy-transmission optic fibre (1) of the described condenser input end (6) in its next stage condenser system respectively.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510373386.5A CN104914501A (en) | 2015-06-30 | 2015-06-30 | Optical fiber condenser and cascading structure constituted by same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510373386.5A CN104914501A (en) | 2015-06-30 | 2015-06-30 | Optical fiber condenser and cascading structure constituted by same |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106016171A (en) * | 2016-07-14 | 2016-10-12 | 南京信息职业技术学院 | Optical fiber light collector |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4662714A (en) * | 1983-10-28 | 1987-05-05 | Kei Mori | Integrated construction of a large number of optical conductor cables |
| US5089055A (en) * | 1989-12-12 | 1992-02-18 | Takashi Nakamura | Survivable solar power-generating systems for use with spacecraft |
| CN101634746A (en) * | 2008-07-23 | 2010-01-27 | 台湾基材科技股份有限公司 | Sunlight collecting device |
| CN201954460U (en) * | 2011-01-24 | 2011-08-31 | 任俊杰 | Sunlight acquisition and conduction illuminating device |
-
2015
- 2015-06-30 CN CN201510373386.5A patent/CN104914501A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4662714A (en) * | 1983-10-28 | 1987-05-05 | Kei Mori | Integrated construction of a large number of optical conductor cables |
| US5089055A (en) * | 1989-12-12 | 1992-02-18 | Takashi Nakamura | Survivable solar power-generating systems for use with spacecraft |
| CN101634746A (en) * | 2008-07-23 | 2010-01-27 | 台湾基材科技股份有限公司 | Sunlight collecting device |
| CN201954460U (en) * | 2011-01-24 | 2011-08-31 | 任俊杰 | Sunlight acquisition and conduction illuminating device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106016171A (en) * | 2016-07-14 | 2016-10-12 | 南京信息职业技术学院 | Optical fiber light collector |
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Application publication date: 20150916 |