CN102819079A - Tight tube optical fiber grating serial sensing optical cable - Google Patents
Tight tube optical fiber grating serial sensing optical cable Download PDFInfo
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- CN102819079A CN102819079A CN2012102934238A CN201210293423A CN102819079A CN 102819079 A CN102819079 A CN 102819079A CN 2012102934238 A CN2012102934238 A CN 2012102934238A CN 201210293423 A CN201210293423 A CN 201210293423A CN 102819079 A CN102819079 A CN 102819079A
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- sensing
- sensing optical
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- 239000013307 optical fiber Substances 0.000 title abstract description 20
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- 238000012360 testing method Methods 0.000 description 1
- 230000002463 transducing effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Abstract
The invention discloses a tight tube optical fiber grating serial sensing optical cable which comprises a sensing optical fiber and a tightly-coated sheath with the external diameter of 900 mu m; the external diameter of the sensing optical fiber is same as the internal diameter of the tightly-coated sheath; the sensing optical fiber is centrally coated by the tightly-coated sheath and tightly coated and touched with the tight tube sheath; optical fiber Bragg gratings with different parameters and intervals are written on the sensing optical fiber according to needs and are externally provided with coating protection. The tight coating of the tight tube optical fiber grating serial sensing optical cable has certain tensile strength and folding strength, can be used for better protecting the central sensing optical fiber and the optical fiber gratings, and reducing and even eliminating chirp phenomena occurring in the installation processes such as sticking; and by virtue of the special encapsulation protection of the tight coating, the survival rate and sensitivity of an optical fiber sensor in the engineering detection field can be greatly improved.
Description
Technical field
the present invention relates to a kind of novel quasi-distributed fiber grating string sensing optic cable.
Background technology
are owing to natural compatibility between fiber grating and the optical fiber; Be easy to a plurality of fiber gratings are connected on the optical fiber and constitute optical fiber optical grating array; Realize quasi-distributed sensing; Add that fiber grating has outside many advantages of ordinary optic fibre; And the transducing signal of itself is a wavelength-modulated, and measuring-signal does not receive the characteristics that light source rises and falls, bending loss of optical fiber is not influenced by light source power fluctuation and system loss, so fiber grating has caused the relevant scholars' in countries in the world extensive concern and very big interest in the application of sensory field.After people such as Morey in 1989 had at first carried out research to the strain of fiber grating and TEMP characteristic, the application of fiber-optic grating sensor was constantly expanded, and people progressively have been applied to it measurement of multiple physical quantity now, have processed various sensors.
very thin fragility of optical fiber self, and it is loaded down with trivial details to continue, and in engineering laying construction and later stage observation process, very easily wrecks, and it is used in the engineering monitoring field be very limited.Particularly receive the influence of fiber grating production technology, the grid region coating is stripped from and is lost protection, very easily fracture in the process of pasting is installed.Utilize the secondary paint-on technique can protect fiber grating to a certain extent, but because fracture or chirp phenomenon appear in influence that glue coated is solidified easily.Length in the monitoring field is monitored apart from multiple spot at present; Mostly adopt a plurality of fiber-optic grating sensor serial connections back to install; Perhaps be pasted on the objective body surface behind a plurality of fiber grating forming fibre-optic grating of the welding string; The former can well protect fiber grating, but is to adopt flange to continue between each sensor, and connecting loss is very big; Easy fracture in latter's taping process, and chirp phenomenon very easily appears, particularly naked grid and naked fibre very easily suffer brokenly to change.Therefore along with the continuous expansion of monitoring and experimental study demand, develop that survivability is strong, construction is simple, the superior sensing optic cable based on the fiber grating string of sensing capabilities has great meaning.
Summary of the invention
the present invention seeks to: provide that a kind of installation is convenient, the high tight alignment distributed sensing optical cable of tensile strength; Solve the problem of fiber grating shortage protection on the naked fibre; And through making the fiber grating string, avoid a plurality of fiber-optic grating sensors to continue the serious problem of loss of signal that causes.
technical scheme of the present invention is: the present invention is the basis with the fiber grating string, is drawn into optical cable at fiber grating string coated outside one deck 900 μ m hard-pressed bale sheaths.The present invention includes sensor fibre and external diameter is hard-pressed bale sheath two parts of 900 μ m, and the external diameter of said sensor fibre is identical with the internal diameter of hard-pressed bale sheath, is wrapped in the center by the hard-pressed bale sheath, contacts with hard-pressed bale sheath hard-pressed bale.
are preferred, and said sensor fibre comprises the sensing fibre core, comprise the covering of sensing fibre core outside, comprise the coating of covering outside.
are preferred, and said sensing fibre core is a fiber core with single-mold.
are preferred, and as required at the Fiber Bragg Grating FBG of specified point with different parameters and distance interval, said Fiber Bragg Grating FBG has the protection of coating outward on the said sensor fibre.
are preferred, and said sensor fibre keeps straight line not twine.
The present invention has following characteristic:
1. quasi-distributed sensing characteristic: sensing and demodulating adopts the fiber grating demodulation technology, promptly the specified point of inscribing fiber grating on the optical fiber is carried out sensor monitoring;
2. low-loss sensing characteristic: adopt the fiber grating string as sensor, promptly do not have splicing point on the sensing optic cable, avoided connecting loss.
Advantage of the present invention is:
hard-pressed bale layer 1. of the present invention can tightly wrap up inner sensor fibre, promotes the coupling of itself and testee, improves the transitivity of strain.
hard-pressed bale layer 2. of the present invention has certain tension and rupture strength, sensor fibre and fiber grating that can the better protection center; The chirp phenomenon that occurs in the installation processes such as minimizing even elimination stickup; The protection of the special package of hard-pressed bale layer can increase substantially Fibre Optical Sensor when using in the engineering detecting field survival rate and sensitivity.
Inner sensor fibre reaction time of temperature has to external world been accelerated in
3. the present invention, promotes the ageing of temperature monitoring.
4. the present invention can directly be used for numerous engineering bodies, in the time of need in rugged surroundings, working, can further be processed into the higher optical cable of intensity.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the present invention is further described:
Fig. 1 is object construction figure of the present invention;
Fig. 2 is a cross section structure synoptic diagram of the present invention.
wherein: 1, sensor fibre, 2, Fiber Bragg Grating FBG, 3,900 μ m hard-pressed bale sheaths.
Embodiment
embodiment: the material of said hard-pressed bale layer 3 possesses certain intensity, satisfies requirements such as certain deformability, machinability and corrosion resistivity.Said hard-pressed bale layer 3 is H-Hytrel1/X-Hytrel2, also can use the hard-pressed bale layer 3 of material preparations such as N-Nylon, F-PVDF.
Manufacturing process of the present invention is following:
at first will make sensor fibre 1, and used sensing fibre core is common fiber core with single-mold among the present invention, core diameter 8 ~ 10 μ m, the cladding diameter 125 μ m of fibre core outside, the coating diameter 250 μ m of covering outside.Inscribe technology specified point on optical fiber 1 through fiber grating and write different parameters and distance Fiber Bragg Grating FBG 2 at interval on request, after inscription is accomplished, carry out the primary coating protection again.
are to make optical cable then; Writing the center that sensor fibre 1 behind the fiber grating string 2 is positioned over 900 μ m hard-pressed bale sleeve pipes 3; The external diameter of said sensor fibre 1 is identical with the internal diameter of hard-pressed bale sheath 3; All be 250 μ m, said sensor fibre 1 is wrapped in the center by hard-pressed bale sheath 3, contacts with hard-pressed bale sheath 3 hard-pressed bales.This process is implemented 900 μ m tight sleeve optic cable drawing technologies capable of using and is realized.In whole implementation process, said sensor fibre 1 keeps straight line not twine, and has guaranteed the smoothness of its light path.Draw its section structure of back shown in Fig. 2, the optical fiber 1 that writes fiber grating string 2 is in the center of 900 μ m hard-pressed bale sleeve pipes 3.
Application process of the present invention is following:
After
sensing optic cable 1 machines; Can directly be pasted on the target object surface, carry out quasi-distributed demodulation test, reach the purpose of quasi-distributed monitoring through the fiber grating demodulation technology; Carry out the monitoring of physical quantitys such as distributed strain, temperature; Perhaps be reprocessed into the higher optical cable of intensity through other optical cable drawing technologies, directly colligation or is cast in and carries out engineering body internal stress strain monitoring in the concrete on steel reinforcement cage; Also can adopt the clamps mode, be installed in the determinand surface.
The quasi-distributed sensing optic cable of
this structure can use by supporting fiber Bragg grating (FBG) demodulator; Perhaps combine the optical cable drawing technology to carry out reinforcing bar reinforcement, thin pattern tube protection, aramid fiber filling etc. and be made into the special applications sensing optic cable, have good, highly sensitive, the characteristics such as intensity is high, installation is convenient, quasi-distributed monitoring of distortion coupling.Can be used for tunnel, bridge, dam and etc. the quasi-distributed monitoring of content such as surface strain, temperature of engineering body; Also can be used as the signal transmission cable of other optical fiber sensing systems such as fiber grating, white light interference.
the foregoing description certainly only are explanation technical conceive of the present invention and characteristics, and its purpose is to let the people who is familiar with this technology can understand content of the present invention and enforcement according to this, can not limit protection scope of the present invention with this.All modifications that the spirit of main technical schemes is done according to the present invention all should be encompassed within protection scope of the present invention.
Claims (5)
1. tight tube fiber grating string sensing optic cable; It is characterized in that: it comprises sensor fibre (1) and hard-pressed bale sheath (3) two parts; The external diameter of said sensor fibre (1) is identical with the internal diameter of hard-pressed bale sheath (3); Be wrapped in the center by hard-pressed bale sheath (3), contact with hard-pressed bale sheath (3) hard-pressed bale.
2. a kind of tight tube fiber grating string sensing optic cable according to claim 1, it is characterized in that: said sensor fibre (1) comprises the sensing fibre core, comprises the covering of sensing fibre core outside, comprises the coating of covering outside.
3. a kind of tight tube fiber grating string sensing optic cable according to claim 2, it is characterized in that: said sensing fibre core is a fiber core with single-mold.
4. a kind of tight tube fiber grating string sensing optic cable according to claim 2; It is characterized in that: as required at the Fiber Bragg Grating FBG (2) of specified point, the protection of coating is arranged outside the said Fiber Bragg Grating FBG (2) on the said sensor fibre (1) with different parameters and distance interval.
5. a kind of tight tube fiber grating string sensing optic cable according to claim 1 is characterized in that: said sensor fibre (1) keeps straight line not twine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102934238A CN102819079A (en) | 2012-08-17 | 2012-08-17 | Tight tube optical fiber grating serial sensing optical cable |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102934238A CN102819079A (en) | 2012-08-17 | 2012-08-17 | Tight tube optical fiber grating serial sensing optical cable |
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| CN102819079A true CN102819079A (en) | 2012-12-12 |
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| CN2012102934238A Pending CN102819079A (en) | 2012-08-17 | 2012-08-17 | Tight tube optical fiber grating serial sensing optical cable |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107255851A (en) * | 2017-08-14 | 2017-10-17 | 江苏法尔胜光电科技有限公司 | The cable configuration and its installation method of a kind of dim light grid array for sensor monitoring |
| CN108427081A (en) * | 2018-03-14 | 2018-08-21 | 中国科学院半导体研究所 | Magnetosensitive sensing optical cable, production method and distribution type fiber-optic sound sense detection of magnetic field system |
| CN109655963A (en) * | 2019-02-28 | 2019-04-19 | 武汉理工大学 | A kind of optical fiber with fixed point coating |
| CN113921186A (en) * | 2021-11-15 | 2022-01-11 | 湖北航天电缆有限公司 | Seismic composite cable |
| CN117824719A (en) * | 2024-01-05 | 2024-04-05 | 重庆大学 | Liquid metal fiber grating sensor array and its protection device and construction method |
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|---|---|---|---|---|
| CN1484056A (en) * | 2002-09-19 | 2004-03-24 | 欧进萍 | Fibre reinforced plastics-optical fibre grating lombined sensor |
| US20050094129A1 (en) * | 2003-10-29 | 2005-05-05 | Macdougall Trevor | Combined Bragg grating wavelength interrogator and brillouin backscattering measuring instrument |
| CN101592765A (en) * | 2008-05-28 | 2009-12-02 | 古河电子北美公司 | Bend-insensitive drop cables for indoor use |
| CN201622374U (en) * | 2009-12-03 | 2010-11-03 | 成都康宁光缆有限公司 | Optical cable for wireless remote RF unit |
| CN102012282A (en) * | 2010-10-29 | 2011-04-13 | 上海华魏光纤传感技术有限公司 | Passive optical fiber temperature semiconductor sensor |
| CN201845113U (en) * | 2010-09-28 | 2011-05-25 | 成都康宁光缆有限公司 | Circular fiber-to-home indoor optical cable |
| CN102288125A (en) * | 2011-07-27 | 2011-12-21 | 苏州南智传感科技有限公司 | Metal-based cable distributed optical fiber sensor |
| CN202720372U (en) * | 2012-08-17 | 2013-02-06 | 苏州南智传感科技有限公司 | Tight sleeve fiber bragg grating string sensing fiber cable |
-
2012
- 2012-08-17 CN CN2012102934238A patent/CN102819079A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1484056A (en) * | 2002-09-19 | 2004-03-24 | 欧进萍 | Fibre reinforced plastics-optical fibre grating lombined sensor |
| US20050094129A1 (en) * | 2003-10-29 | 2005-05-05 | Macdougall Trevor | Combined Bragg grating wavelength interrogator and brillouin backscattering measuring instrument |
| CN101592765A (en) * | 2008-05-28 | 2009-12-02 | 古河电子北美公司 | Bend-insensitive drop cables for indoor use |
| CN201622374U (en) * | 2009-12-03 | 2010-11-03 | 成都康宁光缆有限公司 | Optical cable for wireless remote RF unit |
| CN201845113U (en) * | 2010-09-28 | 2011-05-25 | 成都康宁光缆有限公司 | Circular fiber-to-home indoor optical cable |
| CN102012282A (en) * | 2010-10-29 | 2011-04-13 | 上海华魏光纤传感技术有限公司 | Passive optical fiber temperature semiconductor sensor |
| CN102288125A (en) * | 2011-07-27 | 2011-12-21 | 苏州南智传感科技有限公司 | Metal-based cable distributed optical fiber sensor |
| CN202720372U (en) * | 2012-08-17 | 2013-02-06 | 苏州南智传感科技有限公司 | Tight sleeve fiber bragg grating string sensing fiber cable |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107255851A (en) * | 2017-08-14 | 2017-10-17 | 江苏法尔胜光电科技有限公司 | The cable configuration and its installation method of a kind of dim light grid array for sensor monitoring |
| CN108427081A (en) * | 2018-03-14 | 2018-08-21 | 中国科学院半导体研究所 | Magnetosensitive sensing optical cable, production method and distribution type fiber-optic sound sense detection of magnetic field system |
| CN109655963A (en) * | 2019-02-28 | 2019-04-19 | 武汉理工大学 | A kind of optical fiber with fixed point coating |
| CN113921186A (en) * | 2021-11-15 | 2022-01-11 | 湖北航天电缆有限公司 | Seismic composite cable |
| CN117824719A (en) * | 2024-01-05 | 2024-04-05 | 重庆大学 | Liquid metal fiber grating sensor array and its protection device and construction method |
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Application publication date: 20121212 |