CN103135168A - Optical fiber with double fiber cores for sensing - Google Patents
Optical fiber with double fiber cores for sensing Download PDFInfo
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- CN103135168A CN103135168A CN 201110392773 CN201110392773A CN103135168A CN 103135168 A CN103135168 A CN 103135168A CN 201110392773 CN201110392773 CN 201110392773 CN 201110392773 A CN201110392773 A CN 201110392773A CN 103135168 A CN103135168 A CN 103135168A
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Abstract
An optical fiber with double fiber cores for sensing comprises cladding I and cladding II arranged outside the cladding I. The cladding I is provided with a fiber core I and a fiber core II in parallel, the refractive indexes of the fiber core I and the fiber core II are bigger than that of the cladding I, the refractive index of the cladding I is bigger than that of the cladding II, and a protective layer is arranged outside the cladding II. Optical signals are injected in the end face of the optical fiber with double fiber cores, and therefore the optical signals exist in the fiber core I, the fiber core II, the cladding I and the cladding II. Through a short transmission distance, the optical signals only exist in the fiber core I and the fiber core II, the optical signals in the fiber core I and the fiber core II can be maintained relatively stable, and when a change occurs to the optical fiber, the optical signals in the fiber core I and the fiber core II are reallocated, the changes of the optical signals inside the fiber core I and the fiber core II can be monitored by arranging detection equipment on the end portion of the optical fiber with the double fiber cores, and the monitoring aim is achieved. The optical fiber with the double fiber core for sensing is simple in structure, low in cost, wide in use and good in market prospect.
Description
Technical field
The present invention relates to a kind of optical fiber, be specifically related to a kind of sensing optical fiber with two fibre cores.
Background technology
Oil transportation, water delivery or the gas transmission line of long distance is due to high efficiency, safety, advantage is widely used cheaply, but the monitoring for long distance line does not have suitable means at present, have advantages of distributed monitoring temperature and strain based on ordinary optic fibre Brillouin scattering sensing device, promote the use of but its high cost has limited it.
Summary of the invention
The present invention has disclosed a kind of pair of fibre core sensing optical fiber, has formed two optical signal transmission passages in optical fiber, by detecting the variation of light signal between two photo-signal channels, can reach the purpose of distributed monitoring.That this optical fiber has is easy to use, cost is low, has application prospect preferably.
For solving the problems of the technologies described above, the technical solution used in the present invention is:
A kind of pair of fibre core sensing optical fiber; it is characterized in that: comprise covering one and the covering two that is positioned at covering one outside; be mounted with side by side fibre core one and fibre core two in covering one; the refractive index of described fibre core one and fibre core two is greater than the refractive index of covering one; the refractive index of covering one is greater than the refractive index of covering two, is protective seams in covering two outsides.
Described fibre core one and fibre core two and covering one are the quartz glasss doped with germanium, boron element, and described covering three is high-purity quartz glasss.
Described covering one is high-purity quartz glass, and described covering three is the quartz glasss doped with fluorine element.
The refractive index of described fibre core one is higher than the refractive index of fibre core two.
The external diameter of described fibre core one is greater than the external diameter of fibre core two.
Described fibre core one and fibre core two are placed in covering one with spiral form.
Described fibre core one is positioned on the central shaft of optical fiber, and described fibre core two is parallel with fibre core one.
Described fibre core one is positioned on the central shaft of optical fiber, and described fibre core two is settled around fibre core one spiral.
The diameter of described fibre core one and fibre core two is at 4 to 15 microns, and the thickness of described covering one is at 5 to 60 microns, and the thickness of described covering two is at 5 to 50 microns.
The present invention compared with prior art has the following advantages:
1, inject light signal at of the present invention pair of doped core optical fiber end face, fibre core one, fibre core two, covering one, covering two is interior all light signal, but through shorter transmission range, light signal partial coupling in covering one enters fibre core one, partial coupling enters fibre core two, and the light signal partial coupling in covering two enters covering two, the protective seam that part enters optical fiber dissipates, so transmission of the light signal president distance in fibre core one and fibre core two, and the light signal in fibre core one and fibre core two can keep relative stability, changing appears in one place when optical fiber, as crooked or little when curved, cause the light signal in fibre core one and fibre core two to be redistributed, by just monitoring this variation at two doped core optical fibers end arrangement checkout equipment, can further calculate by light signal and the relation of time that changes the position that variation occurs, reach the purpose of distributed monitoring.
In sum, optical fiber structure of the present invention is simple, cost is low, purposes is wide, can be used for realizing the purpose of distributed or quasi-distributed monitoring sensing, has market outlook preferably.
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
Description of drawings
Fig. 1 is the structural representation of the xsect of optical fiber of the present invention.
Fig. 2 is the structural representation of optical fiber of the present invention index distribution radially.
Description of reference numerals:
1-fibre core one; 2-fibre core one; 3-covering one; 4-covering two; The 5-protective seam.
Embodiment
Embodiment
A kind of pair of fibre core sensing optical fiber as shown in Figure 1 and Figure 2; comprise covering 1 and the covering 24 that is positioned at covering one 3 outsides; be mounted with side by side fibre core 1 and fibre core 22 in covering 1; the refractive index of described fibre core 1 and fibre core 22 is greater than the refractive index of covering 1; the refractive index of covering 1 is greater than the refractive index of covering 24, is protective seams 5 in covering 24 outsides.
inject light signal at two doped core optical fiber end faces, fibre core 1, fibre core 22, covering 1, covering 24 is interior all light signal, but through shorter transmission range, light signal partial coupling in covering 1 enters fibre core 1, partial coupling enters fibre core 22, and the light signal partial coupling in covering 24 enters covering 22, the protective seam 5 that part enters optical fiber dissipates, so transmission of the light signal president distance in fibre core 1 and fibre core 22, and the light signal in fibre core 1 and fibre core 22 can keep relative stability, when optical fiber somewhere appearance changes, as crooked or little when curved, cause the light signal in fibre core 1 and fibre core 22 to be redistributed, by just monitoring this variation at two doped core optical fibers end arrangement checkout equipment, can further calculate by light signal and the relation of time that changes the position that variation occurs, reach the purpose of distributed monitoring.
preferably, the refractive index of described fibre core 1 is higher than the refractive index of fibre core 22, the constraint of one 1 pairs of light signals of fibre core is higher than the constraint of fibre core 22 light signals, be under identical variation at optical fiber, the part optical signals of fibre core 22 interior transmission is coupled into fibre core 1, thereby cause, the relative variation of the light signal strength in fibre core 1 and fibre core 22, by just monitoring this variation at two doped core optical fibers end arrangement checkout equipment, can further calculate by light signal and the relation of time that changes the position that variation occurs, reach the purpose of distributed monitoring.
Preferably, the diameter of described fibre core 1 and fibre core 22 is at 4 to 15 microns, and the thickness of described covering 1 is at 5 to 60 microns, and the thickness of described covering 24 is at 5 to 50 microns.
Preferably, described fibre core 1 and fibre core 22 and covering 1 are the quartz glasss doped with germanium, boron element, and described covering 34 is high-purity quartz glasss.
Preferably, described covering 1 is high-purity quartz glasss, and described covering 34 is the quartz glasss doped with fluorine element.
Preferably, the external diameter of described fibre core 1 is greater than the external diameter of fibre core 22.
Preferably, described fibre core 1 and fibre core 22 are placed in covering 1 with spiral form.
Preferably, described fibre core 1 is positioned on the central shaft of optical fiber, and described fibre core 22 is parallel with fibre core one.
Preferably, described fibre core 1 is positioned on the central shaft of optical fiber, and described fibre core 22 is settled around fibre core one 1 spirals.
The above; it is only preferred embodiment of the present invention; be not that the present invention is imposed any restrictions, every any simple modification, change and equivalent structure of above embodiment being done according to the technology of the present invention essence changes, and all still belongs in the protection domain of technical solution of the present invention.
Claims (9)
1. two fibre core sensing optical fiber; it is characterized in that: comprise covering one and the covering two that is positioned at covering one outside; be mounted with side by side fibre core one and fibre core two in covering one; the refractive index of described fibre core one and fibre core two is greater than the refractive index of covering one; the refractive index of covering one is greater than the refractive index of covering two, is protective seams in covering two outsides.
2. a kind of pair of fibre core sensing optical fiber according to claim 1, is characterized in that, described fibre core one and fibre core two and covering one are the quartz glasss doped with germanium, boron element, and described covering three is high-purity quartz glasss.
3. a kind of pair of fibre core sensing optical fiber according to claim 1, is characterized in that, described covering one is high-purity quartz glass, and described covering three is the quartz glasss doped with fluorine element.
4. a kind of pair of fibre core sensing optical fiber according to claim 1, is characterized in that, the refractive index of described fibre core one is higher than the refractive index of fibre core two.
5. a kind of pair of fibre core sensing optical fiber according to claim 1, is characterized in that, the external diameter of described fibre core one is greater than the external diameter of fibre core two.
6. a kind of pair of fibre core sensing optical fiber according to claim 1, is characterized in that, described fibre core one and fibre core two are placed in covering one with spiral form.
7. a kind of pair of fibre core sensing optical fiber according to claim 1, is characterized in that, described fibre core one is positioned on the central shaft of optical fiber, and described fibre core two is parallel with fibre core one.
8. a kind of pair of fibre core sensing optical fiber according to claim 1, is characterized in that, described fibre core one is positioned on the central shaft of optical fiber, and described fibre core two is settled around fibre core one spiral.
9. a kind of pair of fibre core sensing optical fiber according to claim 1, is characterized in that, the diameter of described fibre core one and fibre core two is at 4 to 15 microns, and the thickness of described covering one is at 5 to 60 microns, and the thickness of described covering two is at 5 to 50 microns.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110392773 CN103135168A (en) | 2011-12-01 | 2011-12-01 | Optical fiber with double fiber cores for sensing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110392773 CN103135168A (en) | 2011-12-01 | 2011-12-01 | Optical fiber with double fiber cores for sensing |
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| Publication Number | Publication Date |
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| CN103135168A true CN103135168A (en) | 2013-06-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201110392773 Pending CN103135168A (en) | 2011-12-01 | 2011-12-01 | Optical fiber with double fiber cores for sensing |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113820782A (en) * | 2021-08-12 | 2021-12-21 | 江苏法尔胜光电科技有限公司 | High-precision homogenizing optical fiber and preparation method thereof |
| CN114236675A (en) * | 2021-12-27 | 2022-03-25 | 中国联合网络通信集团有限公司 | Optical fiber and optical fiber communication system |
-
2011
- 2011-12-01 CN CN 201110392773 patent/CN103135168A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113820782A (en) * | 2021-08-12 | 2021-12-21 | 江苏法尔胜光电科技有限公司 | High-precision homogenizing optical fiber and preparation method thereof |
| CN114236675A (en) * | 2021-12-27 | 2022-03-25 | 中国联合网络通信集团有限公司 | Optical fiber and optical fiber communication system |
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Application publication date: 20130605 |