CN202720372U - Tight sleeve fiber bragg grating string sensing fiber cable - Google Patents
Tight sleeve fiber bragg grating string sensing fiber cable Download PDFInfo
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- CN202720372U CN202720372U CN 201220408254 CN201220408254U CN202720372U CN 202720372 U CN202720372 U CN 202720372U CN 201220408254 CN201220408254 CN 201220408254 CN 201220408254 U CN201220408254 U CN 201220408254U CN 202720372 U CN202720372 U CN 202720372U
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Abstract
The utility model discloses a tight sleeve fiber bragg grating string sensing fiber cable. The fiber cable comprises a sensing fiber and a tight-packaged sheath with a 900micron external diameter. The external diameter of the sensing fiber is the same with an internal diameter of the tight-packaged sheath and the sensing fiber is wrapped at a center of the tight-packaged sheath and forms tight-packaged contact with the tight-packaged sheath. Fiber bragg gratings with different parameters and distance intervals are written on a specific point of the sensing fiber according to a need. The fiber bragg gratings are coated with protection. A tight-packaged layer of the utility model possesses certain tensile and flexural strength so that the center sensing fiber and the fiber bragg grating can be well protected. A chirp phenomenon generated during an installation process of pasting and the like is decreased or eliminated. The special packaging protection of the tight-packaged layer can greatly increase a survival rate and a sensitivity of an optical fiber sensor applied in an engineering detection field.
Description
Technical field
The utility model relates to a kind of novel quasi-distributed fiber grating string sensing optic cable.
Background technology
Owing to compatibility natural between fiber grating and the optical fiber, be easy to a plurality of fiber gratings are connected on the optical fiber and consist of 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 wavelength-modulated, measuring-signal is not subjected to the characteristics that light source rises and falls, bending loss of optical fiber is not affected 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 the people such as Morey in 1989 at first were studied the strain of fiber grating and temperature sensing 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 made various sensors.
The 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 be subjected to the impact of fiber grating production technology, the grid region coating is stripped from and loses protection, very easily fracture in the process of pasting is installed.Utilize the secondary paint-on technique can protect to a certain extent fiber grating, but because fracture or chirp phenomenon easily appear in the impact that glue coated is solidified.Length in the monitoring field is monitored apart from multiple spot at present, install after mostly adopting a plurality of fiber-optic grating sensor serial connections, 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 be to adopt flange to continue between each sensor, connecting loss is very large; 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.
The utility model content
The utility model purpose is: 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 by making the fiber grating string, avoid a plurality of fiber-optic grating sensors to continue the serious problem of loss of signal that causes.
The technical solution of the utility model is: the utility model is drawn into optical cable take the fiber grating string as the basis at fiber grating string coated outside one deck 900 μ m hard-pressed bale sheaths.The utility model comprises that sensor fibre and external diameter are hard-pressed bale sheath two parts of 900 μ m, and the external diameter of described 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.
Preferably, described sensor fibre comprises the sensing fibre core, comprises the covering of sensing fibre core outside, comprises the coating of covering outside.
Preferably, described sensing fibre core is fiber core with single-mold.
Preferably, on the described sensor fibre as required at specified point with different parameters with apart from the Fiber Bragg Grating FBG at interval, described Fiber Bragg Grating FBG has the coating protection outward.
Preferably, described sensor fibre keeps straight line not twine.
The utlity model has following feature:
1. quasi-distributed sensing feature: sensing and demodulating adopts the fiber grating demodulation technology, namely the specified point of inscribing fiber grating on the optical fiber is carried out sensor monitoring;
2. low-loss sensing feature: adopt the fiber grating string as sensor, namely on the sensing optic cable without splicing point, avoided connecting loss.
The utility model has the advantages that:
1. hard-pressed bale layer of the present utility model can tightly wrap up inner sensor fibre, promotes the coupling of itself and testee, improves the transitivity of strain.
2. hard-pressed bale layer of the present utility model has certain tension and rupture strength, can better protect sensor fibre and the fiber grating at 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.
3. the utility model has been accelerated inner sensor fibre reaction time of temperature to external world, promotes the ageing of temperature monitoring.
4. the utility model can be directly used in numerous engineering bodies, in the time of need to working in rugged surroundings, can further be processed into the higher optical cable of intensity.
Description of drawings
Below in conjunction with drawings and Examples the utility model is further described:
Fig. 1 is object construction figure of the present utility model;
Fig. 2 is cross section structure schematic diagram of the present utility model.
Wherein: 1, sensor fibre, 2, Fiber Bragg Grating FBG, 3,900 μ m hard-pressed bale sheaths.
Embodiment
Embodiment: the material of described hard-pressed bale layer 3 possesses certain intensity, satisfies the requirements such as certain deformability, machinability and corrosion resistivity.Described hard-pressed bale layer 3 is H-Hytrel1/X-Hytrel2, also can use the hard-pressed bale layer 3 of the material preparations such as N-Nylon, F-PVDF.
Manufacturing process of the present utility model is as follows:
At first will make sensor fibre 1, used sensing fibre core is common fiber core with single-mold in the utility model, 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 that technology specified point on optical fiber 1 writes different parameters on request and apart from the Fiber Bragg Grating FBG 2 at interval by fiber grating, inscribe finish after, carry out again the primary coating protection.
Then be to make optical cable, sensor fibre 1 behind the Fiber Bragg Grating string 2 is positioned over the center of 900 μ m hard-pressed bale sleeve pipes 3, the external diameter of described sensor fibre 1 is identical with the internal diameter of hard-pressed bale sheath 3, all be 250 μ m, described 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 implementation Process can utilize 900 μ m tight sleeve optic cable drawing technologies to realize.In whole implementation process, described sensor fibre 1 keeps straight line not twine, and has guaranteed the smoothness of its light path.Its section structure is shown in Fig. 2 after drawing, and the optical fiber 1 of Fiber Bragg Grating string 2 is in the center of 900 μ m hard-pressed bale sleeve pipes 3.
Application process of the present utility model is as follows:
After sensing optic cable 1 machines, can directly be pasted on the target object surface, carry out quasi-distributed demodulation test by the fiber grating demodulation technology, reach the purpose of quasi-distributed monitoring, carry out the monitoring of the physical quantitys such as distributed strain, temperature, perhaps be reprocessed into the higher optical cable of intensity by other optical cable drawing technologies, directly colligation is on steel reinforcement cage, or be cast in and carry out engineering body internal stress strain monitoring in the concrete, also can adopt the anchor clamps fixed form, 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 carry out reinforcing bar reinforcement, thin pattern tube protection, aramid fiber filling etc. in conjunction with the optical cable drawing technology and be made into the special applications sensing optic cable, have the characteristics such as Coupling Deformation is good, highly sensitive, intensity is high, installation is convenient, quasi-distributed monitoring.Can be used for tunnel, bridge, dam and etc. the quasi-distributed monitoring of the 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.
Certainly above-described embodiment only is explanation technical conceive of the present utility model and characteristics, and its purpose is to allow the people who is familiar with technique can understand content of the present utility model and according to this enforcement, can not limit protection domain of the present utility model with this.All modifications of doing according to the Spirit Essence of the utility model main technical schemes all should be encompassed within the protection domain of the present utility model.
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 described 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: described 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: described sensing fibre core is 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: on the described sensor fibre (1) as required at specified point with different parameters with apart from the Fiber Bragg Grating FBG (2) at interval, described Fiber Bragg Grating FBG (2) is outer the coating protection.
5. a kind of tight tube fiber grating string sensing optic cable according to claim 1 is characterized in that: described sensor fibre (1) keeps straight line not twine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220408254 CN202720372U (en) | 2012-08-17 | 2012-08-17 | Tight sleeve fiber bragg grating string sensing fiber cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220408254 CN202720372U (en) | 2012-08-17 | 2012-08-17 | Tight sleeve fiber bragg grating string sensing fiber cable |
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| Publication Number | Publication Date |
|---|---|
| CN202720372U true CN202720372U (en) | 2013-02-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220408254 Expired - Lifetime CN202720372U (en) | 2012-08-17 | 2012-08-17 | Tight sleeve fiber bragg grating string sensing fiber cable |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102819079A (en) * | 2012-08-17 | 2012-12-12 | 苏州南智传感科技有限公司 | Tight tube optical fiber grating serial sensing optical cable |
| CN104655036A (en) * | 2015-01-26 | 2015-05-27 | 南京大学 | Deformation quasi-distributed fiber optic sensing system in geotechnical centrifuge model body |
| CN107328503A (en) * | 2017-07-11 | 2017-11-07 | 中国矿业大学 | Coal mine tunnel top board Stress On-Line system and method based on fiber-optic grating sensor |
| CN107677391A (en) * | 2017-10-30 | 2018-02-09 | 深圳伊讯科技有限公司 | A kind of battery temperature sensor |
-
2012
- 2012-08-17 CN CN 201220408254 patent/CN202720372U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102819079A (en) * | 2012-08-17 | 2012-12-12 | 苏州南智传感科技有限公司 | Tight tube optical fiber grating serial sensing optical cable |
| CN104655036A (en) * | 2015-01-26 | 2015-05-27 | 南京大学 | Deformation quasi-distributed fiber optic sensing system in geotechnical centrifuge model body |
| CN107328503A (en) * | 2017-07-11 | 2017-11-07 | 中国矿业大学 | Coal mine tunnel top board Stress On-Line system and method based on fiber-optic grating sensor |
| CN107677391A (en) * | 2017-10-30 | 2018-02-09 | 深圳伊讯科技有限公司 | A kind of battery temperature sensor |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130206 |