CN103135167A - W type optical fiber used for sensing - Google Patents
W type optical fiber used for sensing Download PDFInfo
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- CN103135167A CN103135167A CN 201110392386 CN201110392386A CN103135167A CN 103135167 A CN103135167 A CN 103135167A CN 201110392386 CN201110392386 CN 201110392386 CN 201110392386 A CN201110392386 A CN 201110392386A CN 103135167 A CN103135167 A CN 103135167A
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- refractive index
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Abstract
Provided is a W type optical fiber used for sensing. The W type optical fiber used for the sensing sequentially comprises a fiber core, a first cladding layer, a second cladding layer and a third cladding layer, wherein the fiber core, the first cladding layer , the seconding cladding layer and the third cladding layer are in radial distribution from center to edge, the refractive index of the fiber core is bigger than that of the first cladding layer, the refractive index of the second cladding layer is bigger than the refractive indexes of the first cladding layer and the third cladding layer, and a protective layer is arranged on the outer side of the third cladding layer. When an optical signal is implanted on an end face of the W type optical fiber, the optical signal exists in the fiber core, the first cladding layer, the second cladding layer and the third cladding layer, optical signal transmission only exists in the fiber core and the second cladding layer after a short transmission distance, and the optical signal in the fiber core and the second cladding layer can be maintained to be relative stable. When change such as bending or minor bending appears in one position of the optical fiber, the optical signal in the fiber core and the second cladding are reassigned, and the purpose of detection is achieved due to the fact that the change of the optical signal can be detected through arranging a detecting device on the end portion of the W type optical fiber. The W type optical fiber used for the sensing is simple in structure, low in cost, wide is application, and good in market prospects.
Description
Technical field
The present invention relates to a kind of optical fiber, the sensing optical fiber that to be specifically related to a kind of optical fiber radial refractive index distribution be the W type.
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, Brillouin scattering sensing device based on ordinary optic fibre has advantages of distributed monitoring temperature and strain, promotes the use of but its high cost has limited it.
Summary of the invention
The present invention has disclosed a kind of W type sensing optical fiber, is set to the W type by optical fiber index distribution radially, thereby consists of two optical signal transmission passages, 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 W type sensing optical fiber; radially-arranged from the center to the edge, comprise fibre core, covering one, covering two and covering three successively; the refractive index of described fibre core is greater than the refractive index of covering one, and the refractive index of covering two is greater than the refractive index of covering one and covering three, is protective seams in covering three outsides.
The refractive index of described fibre core exceeds 0.3% than the refractive index of covering one.
The refractive index of described covering two exceeds 0.1% than the refractive index of covering one, and the refractive index of described covering two exceeds 0.3% than the refractive index of covering three.
The refractive index of described covering two exceeds 0.1% than the refractive index of covering one, and the refractive index of described covering two exceeds 0.1% than the refractive index of covering three.
Described fibre core and covering two are the quartz glasss doped with germanium, boron element.
Described covering one is the quartz glass doped with fluorine element.
Described covering three is the quartz glasss doped with fluorine element.
Described covering three is high-purity quartz glasss.
The diameter of described fibre core is 4 to 15 microns, and the thickness of described covering one is 5 to 50 microns, and the thickness of described covering two is 5 to 50 microns, and the thickness of described covering three is 5 to 50 microns.
The present invention compared with prior art has the following advantages:
1, inject light signal at W-type fiber end face of the present invention, fibre core, covering one, covering two and covering three be interior all light signal, but through shorter transmission range, light signal partial coupling in covering one enters fibre core, partial coupling enters covering two, and the light signal partial coupling in covering three enters covering two, the protective seam that part enters optical fiber dissipates, so transmission of the light signal president distance in fibre core and covering two, and the light signal in fibre core and covering two can keep relative stability, changing appears in one place when W-type fiber, as crooked or little when curved, cause the light signal in fibre core and covering two to be redistributed, by just monitoring this variation at W-type fiber end arrangement checkout equipment, can further calculate appearance bending or little curved position by light signal and the relation of time that changes, 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:
The 1-fibre core; 2-covering one; 3-covering two; 4-covering three; The 5-protective seam.
Embodiment
Embodiment
A kind of W type sensing optical fiber as shown in Figure 1 and Figure 2; radially-arranged from the center to the edge, comprise fibre core 1, covering 1, covering 23 and covering 34 successively; the refractive index of described fibre core 1 is greater than the refractive index of covering 1 and covering 23; the refractive index of covering 23 is greater than the refractive index of covering 1 and covering 34, is protective seams 5 in covering 34 outsides.
when the W-type fiber end face injects light signal, fibre core 1, covering 1, covering 23 and covering 34 be interior all light signal, but through shorter transmission range, light signal partial coupling in covering 1 enters fibre core 1, partial coupling enters covering 22, and the light signal partial coupling in covering 34 enters covering 23, the protective seam 5 that part enters optical fiber dissipates, so transmission of the light signal president distance in fibre core 1 and covering 23, and the light signal in fibre core 1 and covering 23 can keep relative stability, changing appears in one place when W-type fiber, as crooked or little when curved, cause the light signal in fibre core 1 and covering 23 to be redistributed, by just monitoring this variation at W-type fiber end arrangement checkout equipment, can further calculate appearance bending or little curved position by light signal and the relation of time that changes, reach the purpose of distributed monitoring.
Preferably, the refractive index of described fibre core 1 exceeds 0.3% than the refractive index of covering 1, and the refractive index of described covering 23 exceeds 0.1% than the refractive index of covering 1, and the refractive index of described covering 23 exceeds 0.3% than the refractive index of covering 34.like this, fibre core 1 differs larger with covering one 2 refractive indexes, light signal constraint for fibre core 1 interior transmission is stronger, and the refractive index of covering 23 differs less than the refractive index of covering 1, a little less than the constraint of the light signal of covering 23 interior transmission, be under identical variation at optical fiber, the part optical signals of covering 23 interior transmission is coupled in covering 1, the part optical signals that enters in covering 1 is coupled in fibre core 1, thereby cause the relative variation of the light signal strength in fibre core 1 and covering 23, by just monitoring this variation at W-type fiber end arrangement checkout equipment, can further calculate appearance bending or little curved position by light signal and the relation of time that changes, reach the purpose of distributed monitoring.
Preferably, the diameter of described fibre core 1 is at 4 to 15 microns, and the thickness of described covering 1 is at 5 to 50 microns, and the thickness of described covering 23 is at 5 to 50 microns, and the thickness of described covering 34 is at 5 to 50 microns.
Preferably, described fibre core 1 and covering 23 are the quartz glasss doped with germanium, boron element.
Preferably, described covering 1 is the quartz glasss doped with fluorine element.
Preferably, described covering 34 is the quartz glasss doped with fluorine element.
Preferably, described covering 34 is high-purity quartz glasss.
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. W type sensing optical fiber; it is characterized in that: radially-arranged from the center to the edge, comprise fibre core, covering one, covering two and covering three successively; the refractive index of described fibre core is greater than the refractive index of covering one; the refractive index of covering two is greater than the refractive index of covering one and covering three, is protective seams in covering three outsides.
2. a kind of W type sensing optical fiber according to claim 1, is characterized in that, the refractive index of described fibre core exceeds 0.3% than the refractive index of covering one.
3. a kind of W type sensing optical fiber according to claim 1, is characterized in that, the refractive index of described covering two exceeds 0.1% than the refractive index of covering one, and the refractive index of described covering two exceeds 0.3% than the refractive index of covering three.
4. a kind of W type sensing optical fiber according to claim 1, is characterized in that, the refractive index of described covering two exceeds 0.1% than the refractive index of covering one, and the refractive index of described covering two exceeds 0.1% than the refractive index of covering three.
5. a kind of W type sensing optical fiber according to claim 1, is characterized in that, described fibre core and covering two are the quartz glasss doped with germanium, boron element.
6. a kind of W type sensing optical fiber according to claim 1, is characterized in that, described covering one is the quartz glass doped with fluorine element.
7. a kind of W type sensing optical fiber according to claim 1, is characterized in that, described covering three is the quartz glasss doped with fluorine element.
8. a kind of W type sensing optical fiber according to claim 1, is characterized in that, described covering three is high-purity quartz glasss.
9. a kind of W type sensing optical fiber according to claim 1, it is characterized in that, the diameter of described fibre core is 4 to 15 microns, and the thickness of described covering one is 5 to 50 microns, the thickness of described covering two is 5 to 50 microns, and the thickness of described covering three is 5 to 50 microns.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110392386 CN103135167A (en) | 2011-12-01 | 2011-12-01 | W type optical fiber used for sensing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110392386 CN103135167A (en) | 2011-12-01 | 2011-12-01 | W type optical fiber used for sensing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103135167A true CN103135167A (en) | 2013-06-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201110392386 Pending CN103135167A (en) | 2011-12-01 | 2011-12-01 | W type optical fiber used for sensing |
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| Country | Link |
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| CN (1) | CN103135167A (en) |
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2011
- 2011-12-01 CN CN 201110392386 patent/CN103135167A/en active Pending
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Application publication date: 20130605 |