CN204142466U - The quiet dynamic checkout unit of distributed sensing fiber multiple goal multiple degrees of freedom - Google Patents
The quiet dynamic checkout unit of distributed sensing fiber multiple goal multiple degrees of freedom Download PDFInfo
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Abstract
The utility model relates to the quiet dynamic test integrated platform of multiple goal multiple degrees of freedom and the method for testing of distributed sensing fiber performance.In the quiet dynamic checkout unit of distributed sensing fiber multiple goal multiple degrees of freedom optical fiber multiple degrees of freedom fixed system successively with manually add discharge mechanism and oil pressure cntrol and add unloading and pretend and be connected, testing fiber obtains system with optical fiber multiple degrees of freedom fixed system and distribution type fiber-optic Brillouin shift and is connected; The test to optical fiber property is realized by the device controlled in multiple degrees of freedom fixed system.The all parts of this test platform all freely can be dismantled and assemble, a multiple goal test platform has been built for completing different test request, probe into possible test and provide huge secondary development space, device of the present utility model, have structure light, cheap, easy to operate, be disturbed little, test class is many, numerous advantages such as convenient are unloaded in strong adaptability, stable performance and adding.
Description
Technical field
The utility model relates to the quiet dynamic test integrated platform of multiple goal multiple degrees of freedom and the method for testing that the utility model relates to distributed sensing fiber performance.
Background technology
Improve constantly along with people's awareness of safety and each domain engineering is built in a large number, the health monitoring of works becomes more important and urgent, and as a kind of functional form sensor, in monitoring structural health conditions field, application constantly increases optical-fiber intelligent material.Distributed optical fiber sensing system is for the sensing and monitoring system based on electric signal and point type optic-fiber monitoring system, and the content of its technical difficulty, monitoring variable, index and monitoring occasion and scope have all shown huge advantage.
Compared with distributed fiberoptic sensor optical parametric, himself some physical parameter is also not exclusively quantitative technique index, usually way carries out correlation test both at home and abroad, do not destroy in test and be specification product, what test is probability event, optical fiber everywhere can not be rolled up for each all to test, therefore be unknown substantially for the optical fiber parameter performance applied in Practical Project, even if for carrying out the acceptable splice of non-destructive test, quantitative cognition is also lacked for the good and bad degree of its performance, therefore for optical fibers, design, produce, buying, construction and use all bring greatly inconvenience and waste.
For current both at home and abroad fiber optic applications field, the distributed fiberoptic sensor parameter that user uses is substantially all the parameter of institute's conventional demarcation when adopting optical fiber to dispatch from the factory.When being applied to more complicated working environment, particularly for field particular job environment of the complicated huge engineerings such as hydraulic structure, it has an impact to monitoring result reliability, especially the mechanical property of distributed fiberoptic sensor and sensing capabilities appreciable impact practical application precision.
Optical fiber indices manufactured under different optical fiber starting material or different optical fiber production process also exists bigger difference, for the optical fiber basic parameter also property of there are differences in the situations such as the different production batch of different fiber manufacturer, different fiber model, different sheath material and same optical fiber model, no matter be therefore scientific research or production application, the test for distribution type fiber-optic mechanical property and sensing capabilities all becomes the prerequisite work primarily carried out.
Fiber-draw disruptive force is smaller, in order to accurately catch the deformation mechanism tracked in its Emergence and Development, destruction Life cycle in time, needs in a hurry to study a kind of accurately nimble multiple goal Fiber Optic Test platform; Along with optical fiber sensing technology is towards intellectuality, digitizing, integrated and miniaturization development, monitor its spatial resolution technology to improve constantly, its monitoring micro-structure body becomes inexorable trend, in order to better be matched in the development of Distributed Optical Fiber Sensing Techniques, need to research and develop a kind of range adjustable, be convenient for carrying, test accurate and simply constructed multiple goal Test integration platform.
Utility model content
The purpose of this utility model is for the deficiencies in the prior art, in order to solve the test problem such as mechanical property and sensing capabilities of distributed sensing fiber in Practical Project and propose one quiet dynamic multiple degrees of freedom optical fiber property test platform and method of testing more effectively and accurately, some performances of tight tube fiber are become a quantitative target from a qualitative index, is generalized to concrete engineering practical application concept from common meaning; The utility model device and method can carry out the test of high-precision optical fiber mechanical property indoor standardization, also can towards the test job of fiber optic applications before Practical Project; Require more Accurate Calibration result time, repeatedly can calculate, according to its result of calculation Normal Distribution principle, final obtain more accurate calibration result.
The utility model adopts following technical scheme:
The quiet dynamic checkout unit of distributed sensing fiber multiple goal multiple degrees of freedom described in the utility model, comprise optical fiber multiple degrees of freedom fixed system, manually add discharge mechanism, oil pressure cntrol add unloading dress, testing fiber, distribution type fiber-optic Brillouin shift acquisition system, Data Management Analysis system; Optical fiber multiple degrees of freedom fixed system successively with manually add discharge mechanism and oil pressure cntrol and add unloading and pretend and be connected, testing fiber obtains system with optical fiber multiple degrees of freedom fixed system and distribution type fiber-optic Brillouin shift and is connected.The test to optical fiber property is realized by the device controlled in multiple degrees of freedom fixed system; Distribution type fiber-optic Brillouin shift obtains system and to be under static state or dynamic stress condition the fiber optics information such as Brillouin shift value for gathering optical fiber; The digital information that Data Management Analysis system collects for online treatment and analyses distribution type fiber-optic Brillouin shift acquisition system and force snesor, high sensitivity thermometer etc.
The quiet dynamic checkout unit of distributed sensing fiber multiple goal multiple degrees of freedom described in the utility model, initial end elastic fixing device is fixed on initial stiff end mounting table by the front storehouse of the through arc of fastening screw by described initial end elastic fixing device, optical fiber is by the small gauge fiber optic communication passage in small diameter optic fibre communicating passage in the front storehouse of arc and high resiliency internal ring wall, by rotating the adjusting bolt be communicated with on screw rod, axial pressure is applied to high resiliency internal ring wall, by circle L-type external annulus, transverse pressure is applied to high resiliency internal ring wall, by high resiliency internal ring wall, hoop constraint is delivered to small gauge fiber optic communication passage.
The quiet dynamic checkout unit of distributed sensing fiber multiple goal multiple degrees of freedom described in the utility model, optical fiber multiple degrees of freedom fixed system also comprises intermediate pulley linkage one and intermediate pulley linkage two, standing groove through before and after being respectively arranged with in rear operator's console middle upper portion position and lower middle position, to lay intermediate pulley linkage one and intermediate pulley linkage two; Pivot link is controlled by handling the round handle of the angular adjustment be connected with dial disc and then driving in intermediate pulley linkage one; With fixed pivot disk for fixed pivot, level connection joint pulley will be drawn optical fiber and will flatly be transitioned in intermediate pulley linkage one from initial end elastic fixing device; Said apparatus is encapsulated in arc operation room, and fastened screw rod is fixed in rear operator's console; Connecting pulley by being positioned in the medial launder on rear operator's console, the testing fiber of drawing in intermediate pulley linkage one being caused in vertical small diameter optic fibre communication passage and is connected on intermediate pulley linkage two; Intermediate pulley linkage two mainly comprises major diameter transition pulley and minor diameter transition pulley, and testing fiber is transitioned into follow-up test section by it.
The quiet dynamic checkout unit of distributed sensing fiber multiple goal multiple degrees of freedom described in the utility model, optical fiber multiple degrees of freedom fixed system also comprises the non-rigid stationary installation of end; Rotating ring turnover is controlled by rotating rotating ring cap in the non-rigid stationary installation of end; Screw piece is provided with in rotating ring inwall, testing fiber establishes threaded optical fiber communication passage by outer wall, optical fiber communication passage is provided with resilient material inwall near optical fiber side and contacts with testing fiber and be delivered in testing fiber by hoop load, resilient material circle wall is subject to the level of rotating ring to pressure, hoop constraint is applied on resilient material circle wall by outer rim heavy wall drum, and hoop load is delivered in the resilient material inwall in optical fiber communication passage.
In the quiet dynamic checkout unit of distributed sensing fiber multiple goal multiple degrees of freedom described in the utility model, generic connectivity pulley is replaceable is the special pulley of built-in spring, threaded rod handle is connected with threaded rod, one end deeply rear operator's console of threaded rod, deep-slotted chip breaker is slotted respectively in upper strip bloom and lower strip bloom one end, slots respectively at the other end of its correspondence, and high resiliency spring applies vertical load to deep-slotted chip breaker in opposite directions, thus testing fiber is subject to hoop constraint.
This proving installation of the quiet dynamic checkout unit of distributed sensing fiber multiple goal multiple degrees of freedom described in the utility model also comprises two unjacketed optical fibers and adds discharge mechanism, for manually adding for discharge mechanism, manual control handle and front operating platform are connected and fixed by threaded disk and fixed disc, horizontal gird with a scale runs through mobile platform, horizontal gird subscript with a scale is marked with scale, bidirectional force sensor is had between mobile platform and front operating platform, manual control handle is connected with the horizontal screw thread crossbeam of rotation, manual control handle two ends have turning handle and vernier control handle respectively, mobile platform is subject to the horizontal rotating force of horizontal screw thread crossbeam, horizontal loading is delivered on initial end elastic fixing device, add for discharge mechanism for oil pressure cntrol, telescoping cylinders and oil pressure add Unloading Control handle and are connected.
This proving installation of the quiet dynamic checkout unit of distributed sensing fiber multiple goal multiple degrees of freedom described in the utility model also comprises special fixing circle seat, special fixing circle seat is connected to lower horizontal and fixes spreader by fixing circular sleeve, and will fix by junction steel plate and justify seat connect with erecting.
Testing fiber in this proving installation of the quiet dynamic checkout unit of distributed sensing fiber multiple goal multiple degrees of freedom described in the utility model, extends to test platform lower end along proving installation from top always, finally obtains system with optical fiber Brillouin frequency displacement and is connected.
The utility model this device of the quiet dynamic checkout unit of distributed sensing fiber multiple goal multiple degrees of freedom of describing can add uninstalling system by optical fiber dynamic static load is applied to optical fiber, supporting distribution type fiber-optic Brillouin shift obtains system and Data Management Analysis system can realize Real-time Collection and analyze optical fiber information, the performance test under optical fiber different curvature can be completed, and directly or indirectly monitoring is realized to its parameter such as ultimate elongation load and synthetical elastic modulus.
The testing procedure of the quiet dynamic checkout unit of distributed sensing fiber multiple goal multiple degrees of freedom described in the utility model is as follows:
Testing fiber is connected with initial end elastic fixing device, through intermediate pulley linkage one and intermediate pulley linkage two, is drawn out to optical fiber Brillouin frequency displacement obtains system by the non-rigid stationary installation of end by level;
Step 1: assemble each parts and carry out operation debugging, especially assembles special pulley gear according to test objective and adjustment rotational angle regulates circle handle regulation test curvature, lays testing fiber.
Step 2: record initial time, temperature and testing fiber initial gage, determine loading type and dynamically and statically monitoring mode, the result of being monitored by bidirectional force sensor carrys out controlled loading progression, carries out stress test to test specimen afterwards.
Step 3: based on test objective, monitors, gathers the Monitoring Data such as the length at each position, angle and load.
Step 4: based on the above-mentioned mechanical test of testing fiber, utilizes the Monitoring Data collected to carry out static and dynamic analysis constantly.
Beneficial effect
The quiet dynamic checkout unit of distributed sensing fiber multiple goal multiple degrees of freedom that utility model provides and method, a reliable sound state multiple degrees of freedom is provided for optical fibers, design, production, buying, construction and use add and unload control system, for Fibre Optical Sensor parameter demarcation, be applied to the Performance Detection before engineering and improve the theoretical and practical application of distribution type fiber-optic further, provide good test platform; The multiple optical fiber elastic fixation system of the utility model ingehious design, by optical fiber, lossless and multiple degrees of freedom is fixed, and relies on unique pulley device link can arbitrarily to change fibre-optical bending angle, realizes multiple goal monitoring; Adopt the artificial of particular design and oil pressure two cover to add uninstalling system to achieve and freely control optical fiber sound state and add unloading, the utility appliance such as the acquisition of its Brillouin shift system, power sensor-based system and temperature acquisition system can realize its mechanical property with the Real-time Collection of sensing capabilities and analysis.
For Distributed Optical Fiber Sensing Techniques, accuracy calibration and raising all have great importance the utility model in actual applications, the all parts of this test platform all freely can be dismantled and assemble, a multiple goal test platform has been built for completing different test request, probe into possible test and provide huge secondary development space, device of the present utility model, have structure light, cheap, easy to operate, be disturbed little, test class is many, numerous advantages such as convenient are unloaded in strong adaptability, stable performance and adding.
Accompanying drawing explanation
Fig. 1 is the floor map of the quiet dynamic checkout unit of distributed sensing fiber multiple goal multiple degrees of freedom of the present utility model;
Fig. 2 is the enlarged diagram of local I structure in Fig. 1;
Fig. 3 is the enlarged diagram of local I I structure in Fig. 1;
Fig. 4 is the enlarged diagram of local I II structure in Fig. 1;
Fig. 5 is the front view of the quiet dynamic checkout unit of distributed sensing fiber multiple goal multiple degrees of freedom of the present utility model;
Fig. 6 is distributed sensing fiber multiple goal multiple degrees of freedom of the present utility model quiet dynamic checkout unit 1-1 sectional view;
Fig. 7 is distributed sensing fiber multiple goal multiple degrees of freedom of the present utility model quiet dynamic checkout unit 2-2 sectional view;
Fig. 8 is initial end elastic fixing device 71 sectional view in the utility model test unit;
Fig. 9 is intermediate pulley linkage 1 sectional view in the utility model test unit;
Figure 10 is intermediate pulley linkage 2 73 sectional view in the utility model test unit;
Figure 11 is end non-rigid stationary installation 74 sectional view in the utility model test unit;
Figure 12 is the 3-3 sectional view of the non-rigid stationary installation 74 of end in the utility model test unit;
Figure 13 is special pulley gear 16 sectional view in the utility model test unit;
Figure 14 is the 4-4 sectional view of special pulley gear 16 in the utility model test unit;
Figure 15 is special fixing circle seat 92 sectional view in the utility model test unit;
Figure 16 is based on the utility model device optical fiber horizontal tension test comparison diagram.
Embodiment
Below in conjunction with accompanying drawing, the utility model is further described:
The quiet dynamic checkout unit of distributed sensing fiber multiple goal multiple degrees of freedom and method, by optical fiber multiple degrees of freedom fixed system 70, manually, it adds that discharge mechanism 81 and oil pressure cntrol add discharge mechanism 40, testing fiber 80, distribution type fiber-optic Brillouin shift obtain system 50, Data Management Analysis system 60 and other backup systems and form.
Wherein, optical fiber multiple degrees of freedom fixed system mainly comprises initial end elastic fixing device 71, intermediate pulley linkage 1 and intermediate pulley linkage 2 73 and the non-rigid stationary installation 74 of end, realizes the laying in testing fiber different directions, different curvature by the different device controlled in multiple degrees of freedom fixed system 70; The frequency displacement of optical fiber distributed type optical fiber Brillouin obtains system 50 and is mainly used to gather under optical fiber is in static state or dynamic stress condition, the fiber optics information such as Brillouin shift value; Data Management Analysis system 60 mainly online treatment and analyses distribution type fiber-optic Brillouin shift obtains the digital information that system and force snesor, high sensitivity thermometer etc. collect; Other auxiliary test units mainly comprise high sensitivity electronic thermometer 91, special fixing circle seat 92, oil pressure add the supporting auxiliary equipment such as Unloading Control handle 93 and shock absorbing resilient support 94.
Optical fiber multiple degrees of freedom fixed system 70 comprises the optical fiber multiple degrees of freedom stationary installation of four kinds of different designs thinkings and using method, wherein pass through the front storehouse 2 of the through arc of fastening screw 1 in initial end elastic fixing device 71, initial end elastic fixing device is firmly fixed at initial stiff end mounting table 46, optical fiber is by the small gauge fiber optic communication passage 7 in small diameter optic fibre communicating passage 6 in the front storehouse of arc 2 and high resiliency internal ring wall 5, constantly axial pressure is applied to high resiliency internal ring wall 5 by rotating the adjusting bolt 8 be communicated with on screw rod 4, high resiliency internal ring wall 5 is constantly forced to because being subject to axle pressure and axial compression occurs, but its longitudinal cross-section is because being subject to the longitudinal pressure constraint of circle L-type external annulus 3, it incites somebody to action constantly longitudinally fastening small gauge fiber optic communication passage 7, optical fiber in the most small gauge fiber optic communication passage 7 is tightly suppressed in wherein, adopt the method for horizontal pressurized interlock longitudinal elasticity distortion that target optical fiber is anchored in nonrigid mode the end that stretches, very effectively can avoid the physical damnification that optical fiber produces because material hardness is inharmonious when being subject to rigidity holder.Initial end elastic fixing device 71 of the present utility model is for designing for this test platform particular/special requirement, and it is convenient, simple to operate, practical to change, and it is tested for optical fiber property and provides sound assurance.
Optical fiber multiple degrees of freedom fixed system 70 comprises intermediate pulley linkage 1 and intermediate pulley linkage 2 73.In intermediate pulley linkage 1, by handling the angular adjustment circle handle 10 be connected with dial disc 9, and then drive control pivot link 18, angle adjustable pulley 15 is regulated according to different testing requirement, optical fiber is changed at the angle of bend at this place, fixed pivot disk 11 plays fixing and point action, the optical fiber that level connection joint pulley 14 mainly will be drawn from initial end elastic fixing device 71, horizontal transition is in intermediate pulley linkage 1, whole device is encapsulated in arc operation room 13, it can freely be dismantled, so that installing optical fibres and control operation, it mainly provides all parts to connect and operating space, the adverse environment interference that protection all parts may exist from the external world, the fastened screw rod of whole device 12 is firmly fixed at rear operator's console 20, the intermediate pulley linkage 1 of this place's utility model utilizes lever balance theory, the control to fibre-optical bending angle is efficiently accurately achieved by fixed pivot, it is workable.Connecting pulley 16 by being positioned in the medial launder on rear operator's console, the testing fiber 80 of drawing from intermediate pulley linkage 1 being caused vertical small diameter optic fibre communication passage 17, is connected to intermediate pulley linkage 2 73.Intermediate pulley linkage 2 73 mainly comprises major diameter transition pulley 18 and slightly minor diameter transition pulley 19, testing fiber 80 is transitioned into follow-up test section by simply and effectively, the intermediate pulley linkage 2 73 of this place's utility model is ingenious utilizes anisodiametric large roundel external arc tangent, testing fiber 80 is gently transitioned into horizontal level from vertical position, it not only can flexible fiber position, and this place's fibre-optical bending curvature can be made to meet test request completely; Standing groove through before and after being respectively arranged with in rear operating platform middle upper portion position and lower middle position, places intermediate pulley linkage 1 and intermediate pulley linkage 2 73 to facilitate.
Optical fiber multiple degrees of freedom fixed system 70 also comprises the non-rigid stationary installation 74 of end.Rotating ring 22 can be controlled by rotation rotating ring cap 21 in this device to pass in and out, rotating ring inwall is threaded portion, optical fiber communication passage 25 is outer wall belt screw thread thin layer optical-fibre channel, this optical-fibre channel has certain thickness resilient material inwall 47 near optical fiber side, itself and optical fiber contact, can hoop load be effectively delivered in testing fiber 80, and can ensure that optical fiber is not subject to the larger high rigid element compressing of rigidity magnitude gap and destroys, when screwing rotating ring 22, its end face near resilient material circle wall 24 will extrude resilient material circle wall 24, because its outer rim heavy wall drum 23 rigidity is larger, it is forced to compress to optical fiber communication passage 25 direction, the resilient material inwall 47 of its internal layer additional has elastic expansion and compression property, optical fiber is fixed on wherein in nonrigid mode.Non-rigid stationary installation 74 of the present utility model, Appropriate application power transmission and equilibrium principle, ingenious at resilient material bulk properties, by rotating connecting move control load between screw thread, achieve the nonrigid interlock of optical fiber preferably to fix, it is simple to operate, for the valid function realizing optical fiber controls to provide another new way.
Generic connectivity pulley 16, when needing the temperature compensation in the situations such as accurate Calculation temperature effect affects or variation of ambient temperature is larger to calculate, can be replaced by the special pulley of built-in spring by this test platform.This special pulley gear mainly through threaded rod handle 26 rotate one end deeply after the threaded rod 27 of operator's console 20, related high resiliency spring 30 compresses by it, the deep-slotted chip breaker 29 of subtend is driven to dock, the testing fiber 80 laid in it will be thereupon tightly compacted, the device of utility model utilizes spring works principle herein, unloading thinking is added in conjunction with screw thread, according to force balance principle, optical fiber is fixed on wherein by the deep-slotted chip breaker 29 being provided with the subtend movement of certain thickness resilient material by skin, it is still elastic fixing device, but it is for special vertical fixed position, this place and unique design, can realize and optical fiber flexible connecting, cooperative transformation, its thinking is novel, structure is succinct, wherein deep-slotted chip breaker 29 is slotted in upper strip bloom 28 and lower strip bloom 31 one end respectively, in order to the other end in its correspondence for subsequent use is slotted respectively.After fixing for testing fiber 80, from this testing fiber 80 extending downwardly into end non-rigid stationary installation 74 place always for fixing and free state, it is not by the impact of charger, it is for only having the Brillouin shift section caused by temperature variation, obtains system 50 calculated as temperature compensation piecewise analysis at this place by distribution type fiber-optic Brillouin shift.
This test platform optical fiber adds uninstalling system.In order to realize different testing requirement, devising two unjacketed optical fibers and adding discharge mechanism.A set of for manually to add discharge mechanism 81, it mainly rotates horizontal screw thread crossbeam 32 by manual control handle 33, by threads turn being driven mobile platform 36 level to stressed movement, and then pull that initial end elastic fixing device 71 is horizontal forward to be moved, thus can realize manually adding unloading to optical fiber, by threaded disk 35 and fixed disc 34, its manual control handle 33 is connected and fixed with front operating platform 37, manual control handle about 33 is held in fig. 1 turning handle and vernier control handle respectively, need to carry out corresponding operating to it according to difference, horizontal gird 38 with a scale runs through mobile platform 36, it is mainly used to mark display scale in real time, bidirectional force sensor 39 is had between mobile platform 36 and front operating platform 37, it is mainly used to obtain sensor fibre and is subject to adding the loading of sound state and unloading value under discharge mechanism effect, second cover charger is the multi-parts such as oil pressure cntrol adds discharge mechanism, and it mainly contains telescoping cylinders 40, oil pressure adds Unloading Control handle 93 and oil pressure control system composition.
The a set of temperature compensation calculating high sensitivity electronic thermometer 91 of another installation in this proving installation, it can read temperature and display current date and time this moment automatically, and it is for judging ambient temperature influential effect, carrying out temperature compensation calculating and recording the effectively supplementary of complete test process.In use may there is excessive tensile load, this equipment is occurred, and position is moved or in Practical Project, occurs the special circumstances that use in non-horizontal surface, be specially designed the special fixing circle seat 92 in other backup systems: special fixing circle seat 92 is connected to lower horizontal and fixes spreader 44 by fixing circular sleeve 42 for this reason, and connected fixing with perpendicular circle seat 43 by junction steel plate 41, be fixed in certain by fixing need fixed position place with erecting round seat 43 and body of bolt under needs fixing situation.In whole test platform bottom, damping hard elastics support 94 is installed, it is formed primarily of built-in hard elastics material, can be used for preventing the impacts such as the vibrations of External force interference and test and transportation existence, farthest to reduce the interference of external environment, improve the Stability and veracity of test optical fiber platform test result.
Obtain for system 50 for the optical fiber Brillouin frequency displacement in this proving installation, also bigger difference is had for its spatial resolution of different analysers, testing fiber 80 extends to test platform lower end along proving installation from top always, the optical fiber trend of this uniqueness, add the length of testing fiber, one of this way object is namely in order to make this device better can be combined with the Fiber Analysis instrument of different spatial resolutions.
Testing fiber 80 adds change value (the Δ v of its Brillouin shift when uninstalling system loads being subject to optical fiber
b)
stretchrelevant with the change of temperature T, strain stress, and have good linear relationship, the Brillouin shift v caused by temperature T
b(T) v is formulated as
b(T)=v
b(T
0)+C '
tΔ T, i.e. Δ v
b(T)=v
b(T)-v
b(T
0)=Δ T × C '
t, wherein, v
b(T
0) be initial temperature T
0under Brillouin shift value, Δ v
b(T) the Brillouin shift variable quantity caused by the temperature variation of the testing fiber section of being stretched, C '
tfor the temperature coefficient of the testing fiber section of being stretched, Δ T is the change value of temperature, can obtain result by aforementioned temperature compensation optical fiber or high sensitivity electronic thermometer 91; The deformation value that the now section of being stretched testing fiber causes because of ambient temperature can be calculated by above-mentioned formula, and then according to Δ v
b(ε, T)
stretch=C '
εΔ ε+C '
tΔ T can draw Δ v
b(ε, T)
stretch=Δ v
b(ε)
stretch+ Δ v
b(T)
stretch, Δ v can be drawn
b(ε)
stretch=Δ v
b(ε, T)
stretch-Δ v
b(T)
stretch, finally calculating the deformation value utilizing this test platform to monitor is
wherein Δ v
b(ε, T)
stretchfor strain to be coupled with temperature the change value of the Brillouin shift caused, Δ ε is the change strained, Δ v
b(ε)
stretch, Δ v
b(T)
stretchbe respectively the Brillouin shift change value caused by stretch section fibre strain and temperature, C '
εfor the coefficient of strain of the section of being stretched testing fiber, the stress that Δ ε is stretched as the section of being stretched testing fiber causes strain variation value.
Data Management Analysis system 60, the digitizing measured value information that analyser 50, bidirectional force sensor 39, high sensitivity electronic thermometer 91 etc. obtain mainly is carried out accessing, processes, is analyzed by it, and draws information changing course curve.
This platform can add uninstalling system by optical fiber and apply dynamic static load to optical fiber, supporting distribution type fiber-optic Brillouin shift obtains system 50 and Data Management Analysis system 60 can realize Real-time Collection and analyze optical fiber information, the performance test under optical fiber different curvature can be completed, and direct or indirect monitoring can be realized for its parameter such as ultimate elongation load and synthetical elastic modulus.Such as, the optical fiber initial gage length of record is l
0, when the payload values collected after applying one constant load is F
0, fiber lengths is now l
00, then strain value is this moment
its corresponding stress value is
s
0for the cross section of optic fibre of correspondence amasss, then can calculate corresponding optical fiber synthetical elastic modulus value by this device is
This platform can also carry out high-precision optical fiber mechanical property rating test, by aforesaid operations, effective for testing fiber time initial tensile elongation is designated as l
1, after being subject to charger effect, the effective tensile elongation of optical fiber is designated as l
2, then the fibre strain value that shape control and monitoring equipment obtain is
the temperature change value using high sensitivity electronic thermometer 91 to monitor is Δ T, and the m time loads relative to initial strain value is Δ ε
m, corresponding temperature variation value is Δ T
m, n-th time loads corresponding dependent variable changing value is Δ ε
n(m ≠ n), corresponding temperature variation value is Δ T
n, then following computing formula can be drawn according to optical fiber Brillouin frequency displacement Computing Principle
Formula is above utilized to obtain:
And then can obtain:
Wherein C
εfor the coefficient of strain, C
tfor temperature coefficient,
it is the Brillouin shift change value under loading for i-th time.By utilizing this test platform, according to the derivation of above-mentioned formula, can carry out high-precision calibrating to the temperature coefficient of testing fiber 80 and the coefficient of strain by the utility model device, the utility model device and method also can towards the test job of fiber optic applications before Practical Project; Require more Accurate Calibration result time, repeatedly can calculate, finally obtain more accurate calibration result according to its result of calculation Normal Distribution principle.
Embodiment 1
The present embodiment for SMF-28e general single mode fiber as testing fiber 80, will illustrate making and the installation step of main device in the utility model:
The first step, the steel plate of long 180mm, wide 30mm, high 120mm is adopted to be made into front operating platform 37, mobile platform 36 is made the steel plate of growth 180mm, wide 60mm, high 60mm, use the steel plate of long 180mm, wide 50mm, high 140mm to be made into rear operator's console 20; A M24 standard bolt hole is respectively processed at front operating platform 37, mobile platform 36 and two, rear operator's console 20 upper end folding corner region, a M27 standard bolt hole is respectively processed at front operating platform 37 and rear operator's console 20 middle and lower part, the circular hole of a 30mm is processed at the position, lower middle of front operating platform 37 two bolts hole, a M20 bolt hole is processed, for placing dissimilar optical fiber elastic fixing device at rear operator's console 20, mobile platform 36 top correspondence position.In the middle of rear operator's console 20, the slotted eye of through front and back is offered at top position, be mainly used in placing pulley gear 16, and press close to face, outside in slotted eye bottom and open through upper and lower small diameter optic fibre communication passage, the slotted eye of through front and back is offered, for placing intermediate pulley linkage 2 73 at the middle lower end position of rear operator's console 20.
Second step, it is 620mm that lower horizontal is fixed spreader 44 long, diameter is 27mm, two-port is threaded, first the special fixing circle seat 92 that size fixes spreader 44 slightly larger than lower horizontal is placed on lower horizontal and fixes spreader 44, fix spreader 44 with lower horizontal front operating platform 37 is connected with rear operator's console 20, be 620mm by length, diameter is that the threaded horizontal gird 38 with a scale of 24mm two-port is by front operating platform 37, mobile platform 36 is connected with rear operator's console 20, use diameter is 50mm, thickness is the fixed disc 34 of 30mm threaded disk 35 external diameter 18mm is 500mm by its manual control handle 33 by the circular hole on front operating platform 37 and length, diameter is that the horizontal screw thread crossbeam 32 of rotation of 30mm connects, the bolt of dimension is finally used to be fixed by above-mentioned member in tight.
3rd step, consider each optical fiber elastic fixing device and other precise part complicacy and high manufacture craft, the making step detailed about it and this place of technique repeat no more, by each optical fiber elastic fixing device of in advance making according to the rules design and installation to the assigned address at each position.
Each parts in other backup systems, with reference to the content in instructions, are carried out selecting and installing according to concrete test request by the 4th step.Finally optical fiber Brillouin frequency displacement is obtained system 50 to be connected with the aforementioned test macro assembled with Data Management Analysis system 60, a set ofly integrate the quiet dynamic test integrated platform of distributed sensing fiber performance multiple goal multiple degrees of freedom adding uninstalling system, dynamometric system, sensor-based system and Data Management Analysis system to form.
Embodiment 2
Conveniently set forth the most basic operation steps of this platform, under only stretching for measuring fiber horizontal axis, concrete elaboration is done in the test of distribution type fiber-optic deformation performance.
1. test material and test specimen
Use SMF-28e general single mode fiber, due to its non-bare fibre, appearance has one deck rubber cover, by tight tube fiber successively through initial end elastic fixing device 71, intermediate pulley linkage 1 and intermediate pulley linkage 2 73 and the non-rigid stationary installation 74 of end, and use the distribution type fiber-optic Brillouin shift of NBX-6050A type pre-pumping Brillouin optical time domain analysis technology to obtain system, DVP-730 type optical fiber splicer, several and the DVP-105 type optical fiber cutter of heat-shrink tube, the support equipments such as Panasonic-CF-FGCYCDP type Data Management Analysis system.
2. testing procedure
Step 1: first regulate circle handle 10 according to certain curvature rotational angle, and will run through the initial end elastic fixing device 71 that there is testing fiber and the non-rigid stationary installation of end 74 by regulating corresponding parts device for screwing up.
Step 2: port testing fiber two ends being connected respectively the distributed optical fiber sensing system of NBX-6050A type pre-pumping Brillouin optical time domain analysis technology, fixing bidirectional force sensor 39 is in correspondence position, open high sensitivity electronic thermometer, Panasonic-CF-FGCYCDP type Data Management Analysis system is connected each monitoring component, completes the preliminary work before loading.
Step 3: record start time and beginning temperature, select loading type, this test is conveniently set forth, manual loading mode is selected to carry out, demarcate the initial gage before loading, and record its numerical value, then rotational angle regulates circle handle 10, the result of being monitored by bidirectional force sensor 39 carrys out controlled loading progression, regulate the hand held turning handle on circle handle 10 to carry out fine setting by rotational angle to load, to realize dynamically accurately controlling in real time, constantly gather Brillouin shift numerical value by using NBX-6050A and utilize Panasonic-CF-FGCYCDP type Data Management Analysis system-computed to strain result.
Step 4: regulate circle handle 10 1 circle at once to record the numerical value of this chronothermometer according to the every rotational angle of the object of this test, and use NBX-6050A to carry out fibre strain monitoring.
3. test result analysis
The strain result that pre-set eight times load is analyzed, first by the temperature variations that thermometer records, finds that temperature remains on about 20 ° always, pass through formula
test temperature change Delta T ≈ 0 can be drawn, Brillouin shift caused by it can be considered, lasts shorter in conjunction with the whole test duration, and when shop experiment, temperature keeps constant substantially, so from the temperature recorded, can ignore because the strain caused by temperature variation.
By formula Δ v
b(ε, T)=C
v εΔ ε+C
vTΔ T and Δ v
b(ε)=Δ v
b(ε, T)-Δ v
b(T) the tensile strain value of testing fiber 80 is calculated, then basis point analysis method is adopted, the strain value at every turn loading step is all deducted initial results, the impact of deduction primary stress, only consider the distortion in tensile loads process, comparative analysis the results are shown in Figure 13, list the correlative value of wherein 4 loading results in the drawings, deduction is because outside the unmodifiable reasons such as the relative displacement that in fiber manufacturing process, internal material own exists when stretching, from these four end values, at the part stretch section 1.8m ~ 2.25m place comprising fixture length, along with the continuous increase loading step, on optical fiber integrally, its tensile strain value is in continuous increase, and change maximum in intermediate load step, initial and terminal stage increase is less in loading.
By verification experimental verification, and carry out Comparative result analysis, and then demonstrate rationality and the feasibility of the utility model device and method of testing.
As mentioned above, although represented with reference to specific preferred embodiment and described the utility model, it shall not be construed as the restriction to the utility model self.Under the spirit and scope prerequisite of the present utility model not departing from claims definition, can make a variety of changes in the form and details it.
Claims (9)
1. the quiet dynamic checkout unit of distributed sensing fiber multiple goal multiple degrees of freedom, is characterized in that: comprise optical fiber multiple degrees of freedom fixed system (70), manually add discharge mechanism (81), oil pressure cntrol adds unloading dress (40), testing fiber (80), distribution type fiber-optic Brillouin shift obtains system (50), Data Management Analysis system (60); Optical fiber multiple degrees of freedom fixed system (70) successively with manually add discharge mechanism (81) and oil pressure cntrol and add to unload and fill (40) and be connected, testing fiber (80) and optical fiber multiple degrees of freedom fixed system (70) and distribution type fiber-optic Brillouin shift obtain system (50) and are connected; The test to optical fiber property is realized by the device controlled in multiple degrees of freedom fixed system (70); Distribution type fiber-optic Brillouin shift obtains system (50) and to be under static state or dynamic stress condition the fiber optics information such as Brillouin shift value for gathering optical fiber; The digital information that Data Management Analysis system (60) collects for online treatment and analyses distribution type fiber-optic Brillouin shift acquisition system and force snesor, high sensitivity thermometer etc.
2. the quiet dynamic checkout unit of distributed sensing fiber multiple goal multiple degrees of freedom according to claim 1, is characterized in that: also comprise initial end elastic fixing device (71), initial end elastic fixing device is fixed on initial stiff end mounting table (46) by the front storehouse of fastening screw (1) through arc (2) by described initial end elastic fixing device (71), optical fiber is by small diameter optic fibre communicating passage (6) in the front storehouse of arc (2) and the small gauge fiber optic communication passage (7) in high resiliency internal ring wall (5), by rotating the adjusting bolt (8) be communicated with on screw rod (4), axial pressure is applied to high resiliency internal ring wall (5), by circle L-type external annulus (3), transverse pressure is applied to high resiliency internal ring wall (5), by high resiliency internal ring wall (5), hoop constraint is delivered to small gauge fiber optic communication passage (7).
3. the quiet dynamic checkout unit of distributed sensing fiber multiple goal multiple degrees of freedom according to claim 1, it is characterized in that: optical fiber multiple degrees of freedom fixed system (70) also comprises intermediate pulley linkage one (72) and intermediate pulley linkage two (73), rear operator's console (20) middle upper portion and center-bottom are not provided with the through standing groove in front and back, for placing intermediate pulley linkage one (72) and intermediate pulley linkage two (73); Pivot link (18) is controlled by handling the round handle (10) of the angular adjustment be connected with dial disc (9) and then driving in intermediate pulley linkage one (72); With fixed pivot disk (11) for fixed pivot, level connection joint pulley (14) will be drawn optical fiber and flatly be transitioned in intermediate pulley linkage one (72) from initial end elastic fixing device (71); Said apparatus is encapsulated in arc operation room (13), and fastened screw rod (12) is fixed in rear operator's console (20); In being positioned on rear operator's console (20) medial launder, connecting pulley (16), the testing fiber (80) of drawing in intermediate pulley linkage one (72) being caused in vertical small diameter optic fibre communication passage (17) and to be connected on intermediate pulley linkage two (73); Intermediate pulley linkage two (73) comprises major diameter transition pulley (18) and minor diameter transition pulley (19), and major diameter transition pulley (18) and minor diameter transition pulley (19) are for being transitioned into follow-up test section by testing fiber (80).
4. the quiet dynamic checkout unit of distributed sensing fiber multiple goal multiple degrees of freedom according to claim 1, is characterized in that: optical fiber multiple degrees of freedom fixed system (70) also comprises the non-rigid stationary installation of end (74), rotating ring (22) turnover is controlled by rotating rotating ring cap (21) in the non-rigid stationary installation of end (74), screw piece is provided with in rotating ring (22) inwall, testing fiber (80) establishes threaded optical fiber communication passage (25) by outer wall, optical fiber communication passage (25) is provided with resilient material inwall (47) near optical fiber side, and contact with testing fiber (80) and hoop load be delivered in testing fiber (80), resilient material circle wall (24) is subject to the level of rotating ring (22) to pressure, hoop constraint is applied on resilient material circle wall (24) by outer rim heavy wall drum (23), hoop load is delivered in the resilient material inwall (47) in optical fiber communication passage (25).
5. the quiet dynamic checkout unit of distributed sensing fiber multiple goal multiple degrees of freedom according to claim 1, it is characterized in that: connect the replaceable special pulley for built-in spring of pulley (16), threaded rod handle (26) is connected with threaded rod (27), one end deeply rear operator's console (20) of threaded rod (27), deep-slotted chip breaker (29) is slotted in upper strip bloom (28) and lower strip bloom (31) one end respectively, slot respectively at the other end of its correspondence, high resiliency spring (30) applies vertical load to deep-slotted chip breaker (29) in opposite directions, hoop constraint testing fiber (80).
6. the quiet dynamic checkout unit of distributed sensing fiber multiple goal multiple degrees of freedom according to claim 1, is characterized in that: also comprise and add discharge mechanism for manually adding discharge mechanism (81) with oil pressure cntrol, manually add threaded disk (35) on discharge mechanism (81) and manual control handle (33) and front operating platform (37) are connected and fixed by fixed disc (34), horizontal gird with a scale (38) runs through mobile platform (36), horizontal gird with a scale (38) subscript is marked with scale, bidirectional force sensor (39) is had between mobile platform (36) and front operating platform (37), manual control handle (33) is connected with the horizontal screw thread crossbeam (32) of rotation, manual control handle (33) two ends have turning handle and vernier control handle respectively, mobile platform (36) is subject to the horizontal rotating force of horizontal screw thread crossbeam (32), horizontal loading is delivered on initial end elastic fixing device (71), the oil pressure cntrol telescoping cylinders (40) added on discharge mechanism adds Unloading Control handle (93) with oil pressure and is connected.
7. the quiet dynamic checkout unit of distributed sensing fiber multiple goal multiple degrees of freedom according to claim 1, it is characterized in that: also comprise fixing circle seat (92), fixing circular sleeve (42) will be fixed and be connected to lower horizontal fix spreader (44) with circle seat (92), and will fix by junction steel plate (41) and justify seat (43) connect with erecting.
8. the quiet dynamic checkout unit of distributed sensing fiber multiple goal multiple degrees of freedom according to claim 1, is characterized in that: testing fiber (80) extends to test platform lower end along proving installation from top always and obtains system (50) with optical fiber Brillouin frequency displacement and be connected.
9. the quiet dynamic checkout unit of distributed sensing fiber multiple goal multiple degrees of freedom according to claim 1, it is characterized in that: add uninstalling system by optical fiber and dynamic static load is applied to optical fiber, supporting distribution type fiber-optic Brillouin shift obtains system (50) and Data Management Analysis system (60) realizes Real-time Collection and analyzes optical fiber information, completes the performance test under optical fiber different curvature and realizes directly or indirectly monitoring to its parameter such as ultimate elongation load and synthetical elastic modulus.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2016011775A1 (en) * | 2014-07-22 | 2016-01-28 | 河海大学 | Multi-target multi-degree-of-freedom static and dynamic test apparatus and method for distributed sensing optical fiber |
| CN108829905A (en) * | 2018-04-03 | 2018-11-16 | 桂林电子科技大学 | A kind of Benchmark System reasonableness test method based on Boolean algebra and Degree of Freedom Analysis |
| CN110967057A (en) * | 2019-12-20 | 2020-04-07 | 中国地质大学（武汉） | Device and method for calibrating optical fiber strain and temperature coefficient |
| CN116519500A (en) * | 2023-04-19 | 2023-08-01 | 山东科技大学 | Method for acquiring dynamic temperature cloud picture of Hopkinson pressure bar sample |
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2014
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2016011775A1 (en) * | 2014-07-22 | 2016-01-28 | 河海大学 | Multi-target multi-degree-of-freedom static and dynamic test apparatus and method for distributed sensing optical fiber |
| US9581522B2 (en) | 2014-07-22 | 2017-02-28 | Hohai University | Distributed sensing optical fiber multi-objective multi-degree-of-freedom static and dynamic test device and method |
| CN108829905A (en) * | 2018-04-03 | 2018-11-16 | 桂林电子科技大学 | A kind of Benchmark System reasonableness test method based on Boolean algebra and Degree of Freedom Analysis |
| CN110967057A (en) * | 2019-12-20 | 2020-04-07 | 中国地质大学（武汉） | Device and method for calibrating optical fiber strain and temperature coefficient |
| CN110967057B (en) * | 2019-12-20 | 2021-08-17 | 中国地质大学（武汉） | Device and method for calibrating optical fiber strain and temperature coefficient |
| CN116519500A (en) * | 2023-04-19 | 2023-08-01 | 山东科技大学 | Method for acquiring dynamic temperature cloud picture of Hopkinson pressure bar sample |
| CN116519500B (en) * | 2023-04-19 | 2024-03-12 | 山东科技大学 | Method for acquiring dynamic temperature cloud picture of Hopkinson pressure bar sample |
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