CN102981230A - 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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- CN102981230A CN102981230A CN2012105339304A CN201210533930A CN102981230A CN 102981230 A CN102981230 A CN 102981230A CN 2012105339304 A CN2012105339304 A CN 2012105339304A CN 201210533930 A CN201210533930 A CN 201210533930A CN 102981230 A CN102981230 A CN 102981230A
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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 the 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 rapidly development, extensively adopt at present the artificial image data method based on conventional electric measuring type sensor on the engineering, this method monitoring range is little, workload is large, efficient is low, have high input, and can't guarantee long-time stability and the accuracy of Monitoring Data.Fibre Optical Sensor have anti-electromagnetic interference (EMI), waterproof, anticorrosive, permanance long, measurement range wide, be convenient to lay the characteristics such as installations, and it is implanted the problem that does not have coupling in monitoring target, affects less on the performance of monitoring target and mechanics parameter etc.; Optical fiber itself be sensor information be again signal transmission medium, can realize the monitoring of the remote distributed of monitoring target.
Traditional sensing optic cable mainly is divided into two classes at present, and a class is the sensing optic cable of tight tube structure, is mainly used in the ess-strain monitoring of regular object, 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 the 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 the works safety monitoring.
To achieve these goals, the present invention is achieved by the following technical solutions:
A kind of high sensitivity wide-range ess-strain sensing optic cable comprises outer jacket and is plugged in the interior lay configuration stiffener of described outer jacket, semi-tight sleeve sensing unit and pine cover sensing unit.
Preferably, described lay configuration stiffener is used for the control measurement sensitivity, and the semi-tight sleeve sensing unit is used 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 from inside to outside is followed successively by 1-4 root the first sensor fibre, material water-proof material and optical fiber bundle tubes; Described pine cover sensing unit from inside to outside is 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 the 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 is greater than the lower limit of the monitoring range of the first sensor fibre and be less than or equal to the higher limit of the monitoring range of the first sensor fibre, and 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 comprises: when the stressed generation strain of ess-strain sensing optic cable, and the at first monitoring of the first sensor fibre in semi-tight sleeve sensing unit strain; At this working stage, strain does not remainingly longly occur because existing in the second sensor fibre in the pine cover sensing unit, and the lay configuration stiffener stretches gradually along with the stressed of ess-strain sensing optic cable; The lower limit of the monitoring range of the second sensor fibre is greater than the lower limit of the monitoring range of the first sensor fibre and be less than or equal to the higher limit of the monitoring range of the first sensor fibre, and 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; When the first sensor fibre in the semi-tight sleeve sensing unit in its monitoring range or arrive monitoring range in limited time, the remaining length of the second sensor fibre in the pine cover sensing unit is just in time offset by strain, the second sensor fibre in the pine sleeve pipe sensing unit does not have to begin to monitor strain after the 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, the lay configuration stiffener stretches gradually along with the stressed of ess-strain sensing optic cable in the first sensor fibre monitoring range, 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 to be along with stressed the stretching, extension gradually of ess-strain sensing optic cable reaches capacity, and the straining sensing optical cable that begins the to meet with stresses Main Function power of bearing.
With respect to prior art, the present invention has the following advantages:
Atomic little ess-strain all can occur at the works initial stage that changes, the reason of common sensing optic cable and stiffener remaining long owing to itself also is difficult for detecting these minimal stress strains, and characteristics of sensing optic cable of the present invention adopt the lay configuration stiffener exactly, increase the ess-strain sensitivity of semi-tight sleeve sensing unit sensor fibre, because making sensing optic cable, the lay configuration stiffener exists stretch to window, the non-main part of the force of stiffener when sensing optic cable is stressed in this stretch to window scope, improved the ess-strain sensitivity of sensing optic cable itself, so improved the ess-strain sensitivity of sensor fibre in the 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 in conjunction with the monitoring range of semi-tight sleeve sensing unit, has increased the monitoring range of sensing optic cable integral body by regulating the remaining long scope of sensor fibre in the pine cover sensing unit.
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 the semi-tight sleeve sensing unit, the strain monitoring scope is 0～0.5%, at this working stage, sensor fibre in the pine cover sensing unit is because existing the remaining long strain that do not occur, but but this optical fiber temperature sensor changes, eliminate this phase temperature and change the error that causes, improve monitoring accuracy.
Pine cover sensing unit working stage: the sensor fibre in the semi-tight sleeve sensing unit lost efficacy in response to change acquires a certain degree or approached and lost efficacy, the remaining length of sensor fibre in the pine cover sensing unit is just in time offset by the strain of this scope at this moment, sensor fibre in the pine sleeve pipe does not have after the remaining length, begin to monitor strain, its strain monitoring scope is 0.3%～1.0%.Overlap the remaining length of sensing unit sensor fibre and the testing range that loose sleeve pipe cabling structure is regulated the ess-strain sensing optic cable by adjusting pine, make the range of sensing optic cable reach 0～1.0%.
The present invention can be used for multiple measurement occasion, and great measurement range is arranged, and takes into account simultaneously measurement sensitivity, has reduced the kind of sensing optic cable, has saved cost, reduces to lay difficulty.
Description of drawings
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 synoptic 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 synoptic diagram with the stress-strain diagram that ordinary construction tightly overlaps sensor fibre in the sensing optic cable of the present invention.
Fig. 7 is the strain curve synoptic diagram of sensing optic cable length growth rate of the present invention and the first sensor fibre and the second sensor fibre.
The present invention is described in further detail below in conjunction with accompanying drawing.
Embodiment
Referring to Fig. 1, Fig. 2, the present invention is used 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 the outer jacket 1, a semi-tight sleeve sensing unit 3 and loose cover sensing unit 4.Stiffener 2, semi-tight sleeve sensing unit 3 and the 4 parallel placements of pine cover sensing unit.
Stiffener 2 in the 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 from inside to outside is followed successively by the first sensor fibre 31, material water-proof material 32, optical fiber bundle tubes 33.The first sensor fibre 31 in the semi-tight sleeve sensing unit 3 can be single-mode fiber, also can be multimode optical fiber, 1～4 of the quantity of the first sensor fibre 31; The first sensor fibre 31 and the material water-proof materials 32 such as optical fiber bundle tubes 33 gap-fill water blocking yarns or ointment prevent that the first sensor fibre 31 is owing to the moisture intrusion destroys.
Referring to Fig. 4, pine cover sensing unit 4 from inside to outside is 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 the pine cover sensing unit 4 can be single-mode fiber, also can be multimode optical fiber, 4～12 of the quantity of the second sensor fibre 41; The second sensor fibre 41 and the material water-proof materials 42 such as PBT pine sleeve pipe 43 gap-fill water blocking yarns or ointment prevent that the second sensor fibre 41 from destroying owing to the moisture intrusion; The material of PBT pine sleeve pipe 43 adopts the 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 synoptic diagram (line b) of stranded stiffener sensing optic cable and the stress strain curve synoptic diagram of the non-stranded stiffener sensing optic cable of employing; usually the effect of stiffener in optical cable mainly is the tensile strength that increases optical cable; the protection internal optical fiber is not damaged; lay configuration stiffener 2 is owing to there is strand to enter the existence of 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; then stiffener 2 does not bear main acting force; only have when tensile elongation during greater than the lay length of stiffener 2; stiffener 2 just begins to bear main acting force, and the stage of not bearing Main Function power at stiffener 2 presents one section stretch to window 211 at the stress strain curve of optical cable.
Referring to Fig. 6, adopt the first sensor fibre 31(line e in the semi-tight sleeve sensing unit 3 in the 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 synoptic 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 the semi-tight sleeve sensing unit, and its ess-strain sensitivity also improves thereupon, so the interval that sensitivity improves is high sensitivity interval 311; The second sensor fibre 41 that pine is overlapped in the 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, so the second sensor fibre 41 is remaining long reducing in this scope.By the scope that the stranded lay ratio of regulating stiffener 2 can be regulated stiffener stretch to window 211, 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 the semi-tight sleeve sensing unit 3, the strain monitoring scope is 0～0.5%, at this working stage, the second sensor fibre 41 in the pine cover sensing unit 4 is because existing the remaining long strain that do not occur, but but the second sensor fibre 41 temperature sensors change, eliminate this phase temperature and change the error that causes, improve monitoring accuracy.
Pine cover sensing unit working stage 412: the first sensor fibre 31 in the semi-tight sleeve sensing unit 3 lost efficacy or approached in response to change acquires a certain degree and lost efficacy, this moment, pine cover sensing unit 4 interior the second sensor fibre more than 41 length were just in time offset by the strain of this scope, the second sensor fibre 41 in the pine sleeve pipe does not have after the remaining length, begin to monitor strain, its strain monitoring scope is 0.3%～1.0%.Overlap the remaining length of sensing unit sensor fibre and the testing range that loose sleeve pipe cabling structure is regulated the ess-strain sensing optic cable by adjusting pine, make the range of sensing optic cable reach 0～1.0%.
Above embodiment only is used for explanation the present invention, but not is used for limiting the present invention.
Claims (10)
1. a high sensitivity wide-range ess-strain sensing optic cable is characterized in that: comprise outer jacket (1) and be plugged in the interior lay configuration stiffener (2) of described outer jacket (1), semi-tight sleeve sensing unit (3) and pine cover sensing unit (4).
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 used for the control measurement sensitivity, semi-tight sleeve sensing unit (3) is used for precision monitor, and pine cover sensing unit (4) is for increasing ess-strain sensing optic cable range.
3. high sensitivity wide-range ess-strain sensing optic cable according to claim 1, it is characterized in that: 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.
4. high sensitivity wide-range ess-strain sensing optic cable according to claim 1, it is characterized in that: described semi-tight sleeve sensing unit (3) from inside to outside is followed successively by 1-4 root the first sensor fibre (31), material water-proof material and optical fiber bundle tubes (33); Described pine cover sensing unit (4) from inside to outside is followed successively by 4-12 root the second sensor fibre (41), material water-proof material, PBT pine sleeve pipe (43) and armoured layer (44).
5. high sensitivity wide-range ess-strain sensing optic cable according to claim 4 is characterized in that: the remaining long scope of the second sensor fibre (41) in the pine cover sensing unit (4) is 0.2%～0.5% of ess-strain sensing optic cable length.
6. high sensitivity wide-range ess-strain sensing optic cable according to claim 4, it is characterized in that: the lower limit of the monitoring range of the second sensor fibre (41) is greater than the lower limit of the monitoring range of the first sensor fibre (31) and be less than or equal to the higher limit of the monitoring range of the first sensor fibre (31), and 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).
7. high sensitivity wide-range ess-strain sensing optic cable according to claim 1 is characterized in that: described stiffener (2), semi-tight sleeve sensing unit (3) and the parallel placement of pine cover sensing unit (4).
8. the monitoring method of each described high sensitivity wide-range ess-strain sensing optic cable in the claim 1 to 7 is characterized in that, comprising:
When the stressed generation strain of ess-strain sensing optic cable, the at first monitoring of the first sensor fibre (31) in the semi-tight sleeve sensing unit (3) strain; At this working stage, strain does not remainingly longly occur because existing in the second sensor fibre (41) in the pine cover sensing unit (4), and lay configuration stiffener (2) stretches gradually along with the stressed of ess-strain sensing optic cable;
The lower limit of the monitoring range of the second sensor fibre (41) is greater than the lower limit of the monitoring range of the first sensor fibre (31) and be less than or equal to the higher limit of the monitoring range of the first sensor fibre (31), and 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 in its monitoring range or arrive monitoring range in limited time, the remaining length of the second sensor fibre (41) in the pine cover sensing unit (4) is just in time offset by strain, the second sensor fibre (41) in the pine sleeve pipe sensing unit does not have to begin to monitor strain after the remaining length.
9. monitoring method according to claim 8 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%.
10. according to claim 8 or 9 described monitoring methods, it is characterized in that, lay configuration stiffener (2) stretches gradually along with the stressed of ess-strain sensing optic cable in the first sensor fibre (31) monitoring range, 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 stretches and reaches capacity along with the stressed continuation of ess-strain sensing optic cable, and the straining sensing optical cable that begins the to meet with stresses Main Function power of bearing.
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Cited By (3)
| 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 |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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| 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 | Combined type sensing optical cable |
| US20110026889A1 (en) * | 2009-07-31 | 2011-02-03 | Draka Comteq B.V. | Tight-Buffered Optical Fiber Unit Having Improved Accessibility |
| CN202256798U (en) * | 2011-08-31 | 2012-05-30 | 李泱 | Flat type sensing optical cable |
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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 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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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| CN102981230B (en) | 2014-10-01 |
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