CN102981230B - High-sensitivity wide-range stress-strain sensing optical cable and monitoring method thereof - Google Patents
High-sensitivity wide-range stress-strain sensing optical cable and monitoring method thereof Download PDFInfo
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- CN102981230B CN102981230B CN201210533930.4A CN201210533930A CN102981230B CN 102981230 B CN102981230 B CN 102981230B CN 201210533930 A CN201210533930 A CN 201210533930A CN 102981230 B CN102981230 B CN 102981230B
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Abstract
The invention discloses a high-sensitivity wide-range stress-strain sensing optical cable for structure safety monitoring, and a monitoring method of the optical cable. The optical cable comprises an outer protection layer, a reinforcing member, a half-tight sleeve sensing unit and a loose sleeve sensing unit, wherein the reinforcing member adopts a twisted structure; and the reinforcing member, the half-tight sleeve sensing unit and the loose sleeve sensing unit are placed in parallel. According to the optical cable, the testing sensitivity of the half-tight sleeve sensing unit is improved by the reinforcing member in the twisted structure, and a range scope of the stress-strain sensing optical cable is expanded by regulating excessive length of the loose sleeve sensing unit and a testing scope of the half-tight sleeve sensing unit. The optical cable can be applied to various measuring occasions, has an extremely large measuring range and takes the measuring sensitivity into consideration, categories of the sensing optical cable are reduced, the cost is saved, and the laying difficulty is reduced.
Description
Technical field
The invention belongs to input and analysis technical field, relate to a kind of high sensitivity wide-range ess-strain sensing optic cable and monitoring method thereof for works safety monitoring.
Background technology
In recent years, in monitoring structural health conditions and Geological Hazards Monitoring, utilize the optical fiber sensing monitoring system of brillouin distributed fiber-optic monitoring technology to obtain development rapidly, in engineering, extensively adopt at present the artificial image data method based on conventional electric measuring type sensor, this method monitoring range is little, workload is large, efficiency is low, have high input, and cannot guarantee long-time stability and the accuracy of Monitoring Data.Fibre Optical Sensor has anti-electromagnetic interference (EMI), waterproof, anticorrosive, permanance long, measurement range is wide, be convenient to the features such as laying installation, is implanted the problem that does not have coupling in monitoring target, less on impacts such as the performance of monitoring target and mechanics parameters; Optical fiber itself is sensor information and signal transmission medium, can realize the remote distributed monitoring to monitoring target.
Traditional sensing optic cable is mainly divided into two classes at present, the sensing optic cable that a class is tight tube structure, and the ess-strain that is mainly used in regular object is monitored, and shortcoming is that monitoring range is little, easily affected by environment; Equations of The Second Kind is the sensing optic cable of redundancy structure, is mainly used in the monitoring of labyrinth thing, complex environment, and shortcoming is that monitoring sensitivity is low.
Summary of the invention
For prior art problem, the object of the invention is to propose a kind of high sensitivity wide-range ess-strain sensing optic cable and monitoring method thereof for works safety monitoring.
To achieve these goals, the present invention is achieved by the following technical solutions:
A high sensitivity wide-range ess-strain sensing optic cable, comprises outer jacket and is plugged in lay configuration stiffener, semi-tight sleeve sensing unit and the pine cover sensing unit in described outer jacket.
Preferably, described lay configuration stiffener is used for controlling measurement sensitivity, and semi-tight sleeve sensing unit is for precision monitor, and pine cover sensing unit is for increasing ess-strain sensing optic cable range.
Preferably, the stranded lay ratio scope of described lay configuration stiffener is between 40～100; Twisting element quantity is 2～7, and the diameter of single element is 0.4～1.2mm, and stranded form is concentric stranding.
Preferably, described semi-tight sleeve sensing unit is from inside to outside followed successively by 1-4 root the first sensor fibre, material water-proof material and optical fiber bundle tubes; Described pine cover sensing unit is from inside to outside followed successively by 4-12 root the second sensor fibre, material water-proof material, PBT pine sleeve pipe and armoured layer.
Preferably, the remaining long scope of the second sensor fibre in pine cover sensing unit is 0.2%～0.5% of ess-strain sensing optic cable length.
Preferably, the lower limit of the monitoring range of the second sensor fibre be greater than the first sensor fibre monitoring range lower limit and be less than or equal to the higher limit of the monitoring range of the first sensor fibre, the higher limit of the monitoring range of the second sensor fibre is greater than the higher limit of the monitoring range of the first sensor fibre.
Preferably, described stiffener, semi-tight sleeve sensing unit and the parallel placement of pine cover sensing unit.
The monitoring method of high sensitivity wide-range ess-strain sensing optic cable, comprising: when the stressed generation strain of ess-strain sensing optic cable, and first the first sensor fibre monitoring strain in semi-tight sleeve sensing unit; At this working stage, the second sensor fibre in pine cover sensing unit is because existing remaining length that strain does not occur, and lay configuration stiffener is along with the stressed of ess-strain sensing optic cable stretches gradually; The lower limit of the monitoring range of the second sensor fibre be greater than the first sensor fibre monitoring range lower limit and be less than or equal to the higher limit of the monitoring range of the first sensor fibre, the higher limit of the monitoring range of the second sensor fibre is greater than the higher limit of the monitoring range of the first sensor fibre; The first sensor fibre in semi-tight sleeve sensing unit is prescribed a time limit in its monitoring range or on arrival monitoring range, the remaining length of the second sensor fibre in pine cover sensing unit is just in time offset by strain, the second sensor fibre in pine sleeve pipe sensing unit does not start to monitor strain after there is no remaining length.
Preferably, the strain monitoring scope of the first sensor fibre is that the strain monitoring scope of the 0～0.5%, second sensor fibre is 0.3%～1.0%.
Preferably, lay configuration stiffener, in the first sensor fibre monitoring range, stretches gradually along with the stressed of ess-strain sensing optic cable, but the Main Function power that the straining sensing optical cable that do not meet with stresses bears; In the monitoring range of the second sensor fibre, stranded stiffener is along with stressed the stretching, extension gradually of ess-strain sensing optic cable reaches capacity, and the straining sensing optical cable that starts the to meet with stresses Main Function power of bearing.
With respect to prior art, the present invention has the following advantages:
At the works initial stage that changes, all can there is atomic little ess-strain, common sensing optic cable is because itself is remaining long and the reason of stiffener be difficult for detecting these minimal stress strains, and a feature of sensing optic cable of the present invention adopts lay configuration stiffener exactly, increase the ess-strain sensitivity of semi-tight sleeve sensing unit sensor fibre, because making sensing optic cable, lay configuration stiffener exists stretch to window, the non-main part of the force of stiffener when sensing optic cable is stressed within the scope of this stretch to window, improved the ess-strain sensitivity of sensing optic cable itself, so improved the ess-strain sensitivity of sensor fibre in semi-tight sleeve sensing unit.By regulating the stranded lay ratio scope (40～100) of stiffener, can change the highly sensitive test specification (0.05%～0.3%) of sensor fibre.
The present invention, by regulating the remaining long scope of sensor fibre in pine cover sensing unit, in conjunction with the monitoring range of semi-tight sleeve sensing unit, has increased the monitoring range of sensing optic cable integral body.
The work of ess-strain sensing optic cable is divided into two stages, semi-tight sleeve sensing unit working stage and pine cover sensing unit working stage.
Semi-tight sleeve sensing unit working stage: the sensor fibre monitoring strain in semi-tight sleeve sensing unit, strain monitoring scope is 0～0.5%, at this working stage, because there is the remaining long strain that do not occur in the sensor fibre in pine cover sensing unit, but this optical fiber can change by temperature sensor, eliminate this phase temperature and change the error causing, improve monitoring accuracy.
Pine cover sensing unit working stage: the sensor fibre in semi-tight sleeve sensing unit lost efficacy because strain acquires a certain degree or approached and lost efficacy, now the remaining length of sensor fibre in pine cover sensing unit is just in time offset by the strain of this scope, after sensor fibre in pine sleeve pipe does not have remaining length, start to monitor strain, its strain monitoring scope is 0.3%～1.0%.By adjusting the remaining length of pine cover sensing unit sensor fibre and the testing range that loose sleeve pipe cabling structure regulates ess-strain sensing optic cable, make the range of sensing optic cable reach 0～1.0%.
The present invention can be used for multiple measurement occasion, and has great measurement range, takes into account measurement sensitivity simultaneously, has reduced the kind of sensing optic cable, has saved cost, reduces to lay difficulty.
Accompanying drawing explanation
Fig. 1, Fig. 2 are the radial structure sectional views of two kinds of embodiment of high sensitivity wide-range ess-strain sensing optic cable of the present invention.
Fig. 3 is the structural representation of sensing optic cable semi-tight sleeve sensing unit.
Fig. 4 is the structural representation of sensing optic cable pine cover sensing unit.
Fig. 5 is the stress strain curve schematic diagram that adopts respectively stranded stiffener and non-stranded stiffener sensing optic cable.
Fig. 6 is that the first sensor fibre and the second sensor fibre contrast schematic diagram with the stress-strain diagram that ordinary construction tightly overlaps sensor fibre in sensing optic cable of the present invention.
Fig. 7 is the strain curve schematic diagram of sensing optic cable length growth rate of the present invention and the first sensor fibre and the second sensor fibre.
Below in conjunction with accompanying drawing, the present invention is described in further detail.
Embodiment
Referring to Fig. 1, Fig. 2, the present invention is for the high sensitivity wide-range ess-strain sensing optic cable of works safety monitoring, and it comprises outer jacket 1 and is arranged at the stiffener 2 of a lay configuration in outer jacket 1, semi-tight sleeve sensing unit 3 and a pine cover sensing unit 4.Stiffener 2, semi-tight sleeve sensing unit 3 and the parallel placement of pine cover sensing unit 4.
Stiffener 2 in sensing optic cable can adopt metal material or nonmetallic materials, and the physical dimension of stiffener 2 is consistent with the size of pine cover sensing unit 4.Stranded lay ratio scope is between 40～100; Twisting element quantity is 2～7; The diameter of single element is 0.4～1.2mm; Stranded form is concentric stranding.
Referring to Fig. 3, semi-tight sleeve sensing unit 3 is from inside to outside followed successively by the first sensor fibre 31, material water-proof material 32, optical fiber bundle tubes 33.The first sensor fibre 31 in semi-tight sleeve sensing unit 3 can be single-mode fiber, can be also multimode optical fiber, 1～4 of the quantity of the first sensor fibre 31; The material water-proof materials 32 such as the first sensor fibre 31 and optical fiber bundle tubes 33 gap-fill water blocking yarns or ointment, prevent that the first sensor fibre 31 is because moisture intrusion destroys.
Referring to Fig. 4, pine cover sensing unit 4 is from inside to outside followed successively by the second sensor fibre 41, material water-proof material 42, PBT pine sleeve pipe 43, armoured layer 44.The second sensor fibre 41 in pine cover sensing unit 4 can be single-mode fiber, can be also multimode optical fiber, 4～12 of the quantity of the second sensor fibre 41; The material water-proof materials 42 such as the second sensor fibre 41 and PBT pine sleeve pipe 43 gap-fill water blocking yarns or ointment, prevent that the second sensor fibre 41 is because moisture intrusion destroys; The material of PBT pine sleeve pipe 43 adopts PBT material; The armoured layer 44 of pine sleeve pipe adopts wrapped the forming of stainless steel band spiral, guarantees the lateral pressure resistant performance of pine cover sensing unit 4.
Referring to Fig. 5, (line a) to adopt the stress strain curve schematic diagram (line b) of stranded stiffener sensing optic cable and the stress strain curve schematic diagram of the non-stranded stiffener sensing optic cable of employing, conventionally the effect of stiffener in optical cable is mainly the tensile strength that increases optical cable, protection internal optical fiber is not damaged, lay configuration stiffener 2 is owing to there being the existence of twisting into coefficient, make the Length Ratio sensing optic cable of stiffener slightly long, when optical cable stretches, tensile elongation is less than the lay length of stiffener 2, stiffener 2 does not bear main acting force, only have when tensile elongation is greater than the lay length of stiffener 2, stiffener 2 just starts to bear main acting force, and the stage of not bearing Main Function power at stiffener 2 presents one section of stretch to window 211 on the stress strain curve of optical cable.
Referring to Fig. 6, adopt the first sensor fibre 31(line e in semi-tight sleeve sensing unit 3 in lay configuration stiffener sensing optic cable) and pine cover sensing unit 4 in the second sensor fibre 41(line c) stress-strain diagram that tightly overlaps sensor fibre (line d) with ordinary construction contrasts schematic diagram.In the scope of sensing optic cable stretch to window 211, sensing optic cable comprises that sensor fibre ess-strain sensitivity wherein increases.And the first sensor fibre 31 is identical with sensing optic cable length in semi-tight sleeve sensing unit, its ess-strain sensitivity also improves thereupon, so the interval that sensitivity improves is high sensitivity interval 311; The second sensor fibre 41 in pine cover sensing unit is remaining long because self existing, and exists the stretch to window 411 of self, and its scope is greater than the scope of the stretch to window 211 of sensing optic cable, thus within the scope of this second sensor fibre 41 remaining long reducing just.By regulating the scope of the adjustable stiffener stretch to window 211 of stranded lay ratio of stiffener 2, the range of adjustment of lay ratio is 40～100, and corresponding stretch to window scope is that the scope in high sensitivity interval 311 is 0.05%～0.3%.
Referring to Fig. 7, when the stressed generation strain of sensing optic cable, the work of ess-strain sensing optic cable is divided into two stages, semi-tight sleeve sensing unit work rank 312(line g) and pine cover sensing unit working stage 412(line h).
Semi-tight sleeve sensing unit working stage 312: the first sensor fibre 31 monitoring strains in semi-tight sleeve sensing unit 3, strain monitoring scope is 0～0.5%, at this working stage, because there is the remaining long strain that do not occur in the second sensor fibre 41 in pine cover sensing unit 4, but the second sensor fibre 41 can change by temperature sensor, eliminate this phase temperature and change the error causing, improve monitoring accuracy.
Pine cover sensing unit working stage 412: the first sensor fibre 31 in semi-tight sleeve sensing unit 3 lost efficacy because strain acquires a certain degree or approached and lost efficacy, now the second sensor fibre more than 41 length in pine cover sensing unit 4 are just in time offset by the strain of this scope, after the second sensor fibre 41 in pine sleeve pipe does not have remaining length, start to monitor strain, its strain monitoring scope is 0.3%～1.0%.By adjusting the remaining length of pine cover sensing unit sensor fibre and the testing range that loose sleeve pipe cabling structure regulates ess-strain sensing optic cable, make the range of sensing optic cable reach 0～1.0%.
Above embodiment is to illustrate the invention and not to limit the present invention.
Claims (5)
1. a high sensitivity wide-range ess-strain sensing optic cable, is characterized in that: comprise outer jacket (1) and be plugged in lay configuration stiffener (2), semi-tight sleeve sensing unit (3) and the pine cover sensing unit (4) in described outer jacket (1); Described stiffener (2), semi-tight sleeve sensing unit (3) and the parallel placement of pine cover sensing unit (4); The stranded lay ratio scope of described lay configuration stiffener (2) is between 40～100; Twisting element quantity is 2～7, and the diameter of single element is 0.4～1.2mm, and stranded form is concentric stranding;
Described semi-tight sleeve sensing unit (3) be from inside to outside followed successively by 1 ?4 the first sensor fibres (31), material water-proof material and optical fiber bundle tubes (33); Described pine cover sensing unit (4) be from inside to outside followed successively by 4 ?12 the second sensor fibres (41), material water-proof material, PBT pine sleeve pipe (43) and armoured layer (44);
The remaining long scope of the second sensor fibre (41) in pine cover sensing unit (4) is 0.2%～0.5% of ess-strain sensing optic cable length;
The lower limit of the monitoring range of the second sensor fibre (41) be greater than the first sensor fibre (31) monitoring range lower limit and be less than or equal to the higher limit of the monitoring range of the first sensor fibre (31), the higher limit of the monitoring range of the second sensor fibre (41) is greater than the higher limit of the monitoring range of the first sensor fibre (31).
2. high sensitivity wide-range ess-strain sensing optic cable according to claim 1, it is characterized in that: described lay configuration stiffener (2) is for controlling measurement sensitivity, semi-tight sleeve sensing unit (3) is for precision monitor, and pine cover sensing unit (4) is for increasing ess-strain sensing optic cable range.
3. the monitoring method of the high sensitivity wide-range ess-strain sensing optic cable described in any one in claim 1 to 2, is characterized in that, comprising:
When the stressed generation strain of ess-strain sensing optic cable, the first monitoring of the first sensor fibre (31) in semi-tight sleeve sensing unit (3) strain; At this working stage, the second sensor fibre (41) in pine cover sensing unit (4) is because existing remaining length that strain does not occur, and lay configuration stiffener (2) is along with the stressed of ess-strain sensing optic cable stretches gradually;
The lower limit of the monitoring range of the second sensor fibre (41) be greater than the first sensor fibre (31) monitoring range lower limit and be less than or equal to the higher limit of the monitoring range of the first sensor fibre (31), the higher limit of the monitoring range of the second sensor fibre (41) is greater than the higher limit of the monitoring range of the first sensor fibre (31); The first sensor fibre (31) in semi-tight sleeve sensing unit (3) is prescribed a time limit in its monitoring range or on arrival monitoring range, the remaining length of the second sensor fibre (41) in pine cover sensing unit (4) is just in time offset by strain, the second sensor fibre (41) in pine sleeve pipe sensing unit does not start to monitor strain after there is no remaining length.
4. monitoring method according to claim 3, is characterized in that, the strain monitoring scope of the first sensor fibre (31) is that the strain monitoring scope of the 0～0.5%, second sensor fibre (41) is 0.3%～1.0%.
5. according to the monitoring method described in claim 3 or 4, it is characterized in that, lay configuration stiffener (2) is in the first sensor fibre (31) monitoring range, along with the stressed of ess-strain sensing optic cable, stretch gradually, but the Main Function power that the straining sensing optical cable that do not meet with stresses bears; In the monitoring range of the second sensor fibre (41), stranded stiffener is along with the stressed continuation of ess-strain sensing optic cable is stretched and reached capacity, and the straining sensing optical cable that starts the to meet with stresses Main Function power of bearing.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104459917A (en) * | 2014-12-30 | 2015-03-25 | 东捷光电科技(苏州)有限公司 | Temperature stress sensing optical cable |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104952542A (en) * | 2015-07-28 | 2015-09-30 | 江苏藤仓亨通光电有限公司 | Multi-purpose optical fiber composite overhead phase conductor |
| CN106094146A (en) * | 2016-08-30 | 2016-11-09 | 江苏中天科技股份有限公司 | Pre-buried stress temperature sensing optical cable in a kind of RTP |
| CN109405854A (en) * | 2018-10-19 | 2019-03-01 | 吉林大学 | A kind of bionical strain amplification, the programmable sensing device of sensitivity and application |
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| CN2831162Y (en) * | 2005-08-10 | 2006-10-25 | 烽火通信科技股份有限公司 | Indoor reinforced single-core optical cable |
| CN201392418Y (en) * | 2009-03-19 | 2010-01-27 | 江苏通鼎光电股份有限公司 | Composite sensing optical cable |
| US20110026889A1 (en) * | 2009-07-31 | 2011-02-03 | Draka Comteq B.V. | Tight-Buffered Optical Fiber Unit Having Improved Accessibility |
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