CN209495662U - A kind of fibre optical sensor prestressing force loading device and system - Google Patents
A kind of fibre optical sensor prestressing force loading device and system Download PDFInfo
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- CN209495662U CN209495662U CN201920244592.XU CN201920244592U CN209495662U CN 209495662 U CN209495662 U CN 209495662U CN 201920244592 U CN201920244592 U CN 201920244592U CN 209495662 U CN209495662 U CN 209495662U
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Abstract
The utility model relates to physical experiments technical fields, specifically disclose a kind of fibre optical sensor prestressing force loading device and system, device includes bracket, the first wire fixing clamp being fixedly mounted on bracket and the second wire fixing clamp, the first fixed pulley being fixedly mounted on bracket and the second fixed pulley and for applying prestressed first movable pulley and the second movable pulley；System includes device and optical frequency domain analysis instrument and computer, and the both ends connection of optical frequency domain analysis instrument and optical fiber, computer is connect with optical frequency domain analysis instrument, for analyzing the optical signal after measuring.The device of the utility model makes optical fiber generate stretching strain and hanging counterweight on the first movable pulley and the second movable pulley and applying preparatory tensile stress to optical fiber, effectively simulate the physical characteristic of distributed fiberoptic sensor under a stretching force in stratum deformation detection, compressive strain value detection when stratum is pressurized is realized, to obtain more accurately analyzing result.
Description
Technical field
The utility model relates to physical experiments technical field more particularly to a kind of fibre optical sensor prestressing force load dresses
It sets and system.
Background technique
Stratum settlement is a kind of worldwide geological problem, will become geological disaster when serious.Model test is by indoors
Field engineering structure and its loading conditions are simulated, back analysis are carried out according to test result and according to the theory of similarity, to be showed
Deformation behaviour, stability, stress and the failure mechanism etc. of field engineering structural system, and it is finally reflected the practical shape of engineering site
State is the most direct-vision method for solving the problems, such as field engineering.Stratum deformation simulation test device deformation test method mainly has percentage
Table measurement, displacement sensor, total station survey and close-range photogrammetry, all of above test method can only be outside measurement models
Portion's deformation and overall deformation, cannot measure model internal modification and strain.Traditional strain detecting means mainly have electricity
A few class sensors such as strain gage, differential resistance strain gage, steel chord type and flat jack formula are hindered, while having scholar's use both at home and abroad
The method and Ground Penetrating Radar of audio-frequency stress wave detection, the methods of wavelet analysis.These electrical category sensitive components largely use,
And having mature technology, the especially long-time stability of strain ga(u)ge, temperature drift, zero point stability and long distance transmission is asked
Topic is preferably solved.But these sensors can not achieve distributed measurement there are still moisture-proof, waterproof, interference free performance are poor
The disadvantages of.These defects hinder the raising of model test level of accuracy and growing high-precision of scientific research is wanted
It asks.
Optical fiber sensing technology is one kind using light as carrier, and optical fiber is medium, the sensing technology of perception and transmission outer signals.
Distributed Optical Fiber Sensing Techniques are applied to the deformation detection of all kinds of geotechnical structures, apply in test method and measuring instrument is researched and developed
On do a lot of work.However, most researchs remain in the applicability that distribution type fiber-optic measures rock deformation, testing
As a result reliability and test result explain it is still indefinite, the coupled relation that is mainly manifested between optical fiber and tested matrix and
Optical fiber is not perfect to the measurement method of strain.So designing a kind of more perfect measurement scheme becomes urgent problem to be solved.
Utility model content
For in the prior art the technical issues of, the utility model provide a kind of fibre optical sensor prestressing force loading device and
System.
A kind of fibre optical sensor prestressing force loading device, including bracket, the first wire fixing clamp being fixedly mounted on bracket and
Second wire fixing clamp, the first fixed pulley being fixedly mounted on bracket and the second fixed pulley and dynamic for applying prestressed first
Pulley and the second movable pulley；Wherein: one end of optical fiber is clamped by the first wire fixing clamp, and the other end successively bypasses the first movable pulley,
After one fixed pulley, the second fixed pulley and the second movable pulley, clamped by the second wire fixing clamp；Under first movable pulley and the second movable pulley
The equal counterweight of square sprung mass generates downward pulling force to the first movable pulley and the second movable pulley, and then applies to optical fiber pre-
Stress.
Further, device further includes pillar buoy and perforated plate, in which: under perforated plate is lain in a horizontal plane in in pillar buoy
Portion, and the internal diameter of its outer diameter and pillar buoy matches；At least provided with the first through hole that two positions are symmetrical on perforated plate
With the second through-hole, optical fiber sequentially passes through first through hole and the second through-hole on perforated plate after around the first fixed pulley, further around mistake
Second fixed pulley；Padded coaming is loaded below perforated plate in pillar buoy, it is equal to be filled with composition above the perforated plate in pillar buoy
Even cast material.
Further, device further includes the coiling card slot equipped with U-shaped groove, in which: coiling card slot is mounted on perforated plate
Lower section, and the both ends of U-shaped groove are mutually connected with first through hole and the second through-hole respectively；It is U-shaped around entering after optical fiber passes through first through hole
The second through-hole is then passed through after card slot.
Further, the first movable pulley and the second movable pulley pass through the first spring respectively and second spring is connected to bracket
On.
Further, bracket includes cross bar, the first vertical bar, the second vertical bar, in which: the both ends of cross bar are separately fixed at first
The upper end of vertical bar and the second vertical bar.
Further, cross bar and the first vertical bar, the second vertical bar are retractable structure.
Further, bracket further includes first base and second base, in which: first base and second base are installed respectively
In the lower end of the first vertical bar and the second vertical bar.
Further, the first wire fixing clamp and the second wire fixing clamp are rubber wire fixing clamp.
Further, optical fiber, which is equipped with, increases resistance point.
A kind of fibre optical sensor prestressing force loading device of the utility model embodiment, by the first movable pulley and second
Counterweight is hung on movable pulley to apply preparatory tensile stress to optical fiber and optical fiber is made to generate stretching strain, passes through pillar buoy and perforated plate
Design makes optical fiber receive the pressure of cast material and generate compressive strain, effectively simulates distribution type fiber-optic in stratum deformation detection
Physical characteristic of the sensor under pulling force and pressure effect realizes compressive strain value detection when stratum is pressurized, to obtain more
Precise results.
A kind of fibre optical sensor prestressing force loading system further includes optical frequency domain analysis instrument and calculating including above-mentioned device
Machine, in which: the input terminal and output end of optical frequency domain analysis instrument are connect with the both ends of optical fiber respectively, and output end is used for optical fiber transmission
The optical signal of measurement, input terminal receive the optical signal after measurement；Computer is connect with optical frequency domain analysis instrument, after analyzing measurement
Optical signal.
The fibre optical sensor prestressing force loading system of the utility model embodiment, on the basis of above-mentioned apparatus, in conjunction with light
Frequency-domain analysis instrument completes experiment, and is analyzed by computer measurement result, to obtain the more accurate physics of optical fiber
Characteristic provides the referential of high value for the actual measurement of distributed fiberoptic sensor.
Detailed description of the invention
Illustrate the utility model embodiment or technical solution in the prior art in order to clearer, it below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it is clear that, the accompanying drawings in the following description is only
It is some embodiments of the utility model, for those of ordinary skill in the art, in the premise not made the creative labor
Under, it can also be obtained according to these attached drawings other attached drawings.
Fig. 1 is a kind of structure chart of fibre optical sensor prestressing force loading device of the utility model embodiment；
Fig. 2 is a kind of another structure chart of fibre optical sensor prestressing force loading device of the utility model embodiment；
Fig. 3 is a kind of coiling notch figure of fibre optical sensor prestressing force loading device of the utility model embodiment
(1)；
Fig. 4 is a kind of perforated plate structure design of fibre optical sensor prestressing force loading device of the utility model embodiment
Figure；
Fig. 5 is a kind of coiling notch figure of fibre optical sensor prestressing force loading device of the utility model embodiment
(2)；
Fig. 6 is a kind of coiling notch figure of fibre optical sensor prestressing force loading device of the utility model embodiment
(3)；
Fig. 7 is a kind of increasing resistance point distribution map of fibre optical sensor prestressing force loading device of the utility model embodiment；
Fig. 8 is a kind of composition figure of fibre optical sensor prestressing force loading system of the utility model embodiment；
Fig. 9 is the composition figure of another fibre optical sensor prestressing force loading system of the utility model embodiment.
Wherein: 1- bracket, 101- cross bar, the first vertical bar of 102-, the second vertical bar of 103-, 104- first base, 105- second
Pedestal, the first wire fixing clamp of 2-, the second wire fixing clamp of 3-, the first fixed pulley of 4-, the second fixed pulley of 5-, the first movable pulley of 6-, 7- second
Movable pulley, 8- optical fiber, 9- pillar buoy, 10- perforated plate, 11- first through hole, the second through-hole of 12-, 13-U type groove, 14- coiling clip
Slot, the first spring of 15-, 16- second spring, 17- increase resistance point, 18- optical frequency domain analysis instrument, 19- computer.
Specific embodiment
Below in conjunction with the attached drawing in the utility model, to the technical scheme in the embodiment of the utility model carry out it is clear,
Complete description, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole implementation
Example.Based on the embodiments of the present invention, those skilled in the art is without making creative work
All other embodiment obtained, belongs to the protection scope of the utility model.
As shown in Figure 1, for a kind of fibre optical sensor prestressing force loading device of the utility model embodiment, including bracket 1,
The first wire fixing clamp 2 and the second wire fixing clamp 3 that are fixedly mounted on bracket 1,4 and of the first fixed pulley being fixedly mounted on bracket 1
Second fixed pulley 5 and for applying prestressed first movable pulley 6 and the second movable pulley 7；Wherein: one end of optical fiber 8 is by
The clamping of one wire fixing clamp 2, the other end successively bypass the first movable pulley 6, the first fixed pulley 4, the second fixed pulley 5 and the second movable pulley 7
Afterwards, it is clamped by the second wire fixing clamp 3；The equal counterweight of the underhung quality of first movable pulley 6 and the second movable pulley 7, to first
Movable pulley 6 and the second movable pulley 7 generate downward pulling force, and then apply prestressing force to optical fiber 8.
Bracket 1 in the present embodiment is used to play the role of support for entire experiment, herein not to its specific design structure
It limits, bracket 1 can be designed as including cross bar 101, the first vertical bar 102, the second vertical bar 103, the both ends of cross bar 101 are solid respectively
It is scheduled on the upper end of the first vertical bar 102 and the second vertical bar 103.For the stability of reinforced support 1, the present embodiment can also be set bracket 1
Count into there are three tools, four structures even more than vertical bar, and design have at least one cross bar for install the first fixed pulley 4,
Second fixed pulley 5 and setting the first wire fixing clamp 2, the second wire fixing clamp 3.Preferably, the bracket 1 of the present embodiment design is symmetrical junction
Structure, it is ensured that uniform force when experiment carries out, accuracy are higher.The first wire fixing clamp 2 and the second wire fixing clamp 3 in the present embodiment are used for
Grip optical fiber 8, and guarantee that optical fiber 8 will not move in the case where stress, it is used for optical fiber 8 during prestress application
The section of measurement remains unchanged, and makes measurement result more easily comparative analysis.
The first fixed pulley 4 and the second fixed pulley 5 in the present embodiment are mounted on same level height, 6 He of the first movable pulley
Second movable pulley 7 is located at same level height, and the first fixed pulley 4, the second fixed pulley 5, the first movable pulley 6 and the second movable pulley
7 are generally aligned in the same plane.The present embodiment is to the first fixed pulley 4, the second fixed pulley 5 and the first movable pulley 6, the second movable pulley 7
Product type is without limitation, it is preferred that the first fixed pulley 4 is identical with 5 structure of the second fixed pulley, the first movable pulley 6 and
The structure of two movable pulleys 7 is identical；It is furthermore preferred that the first fixed pulley 4, the second fixed pulley 5, the first movable pulley 6 and second are dynamic
The structure of pulley 7 is identical.The device of the present embodiment, using the distributed sensing characteristic of optical fiber 8, in the first movable pulley 6
When with the second movable pulley 7 by power straight down, pulling force is generated to optical fiber 8, and then analyzes optical fiber 8 and the strain of pulling force is imitated
Fruit, the model as optical fiber measurement formation variation.It should be noted that the weight of counterweight applied in the present embodiment should be in light
Fibre 8 can be within tolerance range.
As shown in Figure 2 and Figure 3, the fibre optical sensor prestressing force loading device of another embodiment of the utility model,
On the basis of a upper embodiment, the present embodiment further includes pillar buoy 9 and perforated plate 10, and wherein perforated plate 10 lies in a horizontal plane in cylindricality
Middle and lower part in cylinder 9, and the internal diameter of its outer diameter and pillar buoy 9 matches；It is mutual at least provided with two positions on perforated plate 10
Symmetrical first through hole 11 and the second through-hole 12, optical fiber 8 sequentially pass through first on perforated plate 10 after around the first fixed pulley 4
Through-hole 11 and the second through-hole 12, further around the second fixed pulley 5 excessively；Padded coaming, cylindricality are loaded below perforated plate 10 in pillar buoy 9
The cast material of uniform ingredients is filled with above perforated plate in cylinder 9.It should be noted that cast material in the present embodiment
Weight should be greater than the weight of external suspension counterweight, it is ensured that during measurement 8 compression of optical fiber and tensile stress, the position of perforated plate 10
Setting will not move up.
The padded coaming and cast material loaded in pillar buoy 9 in the present embodiment is used for simulated formation soil property, with
It realizes the strain effects to the pressure of optical fiber 8, the composition of padded coaming and cast material is not construed as limiting in the present embodiment, it is excellent
Choosing, using fine quartz sand be used as padded coaming, for guarantee experimental analysis accuracy, using sand uniform in material as mould
Profile material, enable be located at cast material below 8 uniform force of optical fiber, the cast material of the present embodiment also can be selected clay,
Dauk.In the present embodiment, the unlimited concrete shape for determining pillar buoy 9 and perforated plate 10, only need 10 outer diameter of perforated plate with
The internal diameter of pillar buoy 9 matches, and the section of pillar buoy 9 may be designed as circle, square, rectangle, regular polygon, and (side is even
Number) etc.；Also the unlimited specific size and material for determining pillar buoy 9 and perforated plate 10, optional rigid plastics are made the present embodiment.This
Perforated plate 10 in embodiment, is provided with the first through hole 11 and the second through-hole 12 of at least two positional symmetries, in the present embodiment
Defined by position it is symmetrical, be meant that, the straight line where first through hole 11 and the second through-hole 12 is the one of perforated plate 10
Symmetry axis, and the size for stretching out the both ends institute stress of the optical fiber 8 of perforated plate 10 is impartial.By 11 He of first through hole of positional symmetry
Second through-hole 12 is referred to as one group of through-hole, the i.e. settable multiple groups of perforated plate 10 of the present embodiment, as shown in figure 4, being circular perforation
Plate 10, wherein a-a ', b-b ', c-c ', d-d ', e-e ', f-f ', g-g ' and, h-h ' is respectively one group of through-hole, and the present embodiment is to through-hole
Design do not limit specific position, it is preferred that multiple groups through-hole, similar c- are set on a symmetry axis of perforated plate 10
C ', d-d ', e-e ', f-f ', g-g ', h-h ' are conveniently adjusted 8 length of optical fiber of compression experiment, can be used as a variable and carry out
Many experiments are more accurate to the experimental analysis in later period.In the present embodiment the pore size of through-hole then according to the line footpath of optical fiber 8 into
Row design, such as the optical fiber 8 that the aperture of this group of through-hole of a-a ' is relatively large, slightly larger suitable for line footpath.Preferably, in this implementation
In example, optical fiber 8 between the first wire fixing clamp 2 and the first movable pulley 6, between the first movable pulley 6 and the first fixed pulley 4, it is first fixed
Between pulley 4 and first through hole 11, between the second through-hole 12 and the second fixed pulley 5, the second fixed pulley 5 and the second movable pulley 7 it
Between and each section between the second movable pulley 7 and the second wire fixing clamp 3 be vertical direction, when optical fiber 8 is by stress, stress
Direction is consistent with wire direction, is convenient for force analysis.
The fibre optical sensor prestressing force loading device of the utility model, on the one hand, optical fiber sensing technology is selected to be used for model
Test, have the advantages that strong antijamming capability, durability are good, sensing media is various informative, gently it is fine and soft it is tough, be easily installed；It is another
Aspect, the first wire fixing clamp 2 and the second wire fixing clamp 3 designed in the present apparatus is by 8 fixed clamp of optical fiber, it is determined that prestressing force load is real
The test scope tested；Tensile stress is applied to optical fiber 8 in advance using counterweight, so that accurate detection optical fiber 8 applies in cast material
Compression under the strain effects that generate, and then improve accuracy and precision of the optical fiber 8 in the measurement of actual stratum deformation.
Specifically, as shown in figure 3, the device of the present embodiment further includes the coiling card slot 14 equipped with U-shaped groove 13, in which:
Coiling card slot 14 is mounted on the lower section of perforated plate 10, and the both ends of U-shaped groove 13 respectively with first through hole 11 and the second through-hole 12
Mutually it is connected；After optical fiber 8 passes through first through hole 11, the second through-hole 12 is then passed through after entering U-shaped card slot 13.The present embodiment designs coiling
Card slot 14 is to alleviate perforated plate and top model material to reduce the fiber section crooked radian for being located at 10 lower section of perforated plate
Expect the extruding to optical fiber, prevents from excessively bending such as to impact measurement result even damaging optical fiber 8.Fig. 3 and Fig. 5, Fig. 6 institute
Show, the coiling card slot 14 in the present embodiment not only may be designed as " U-shaped ", can also be set as " arc-shaped ", " semicircle " or coiling
Card slot 14 can also design other card slots with buffering effect to meet the requirement of experiment.Material of the present embodiment to coiling card slot 14
Matter does not do specific restriction, is preferably made of rubber or other flexible materials of need.
Specifically, as shown in Figure 1 or 2, the first movable pulley 6 in the present embodiment passes through respectively with the second movable pulley 7
First spring 15 and second spring 16 are connected on bracket 1.It, can be by using the design of the first spring 15 and second spring 16
The position of one movable pulley 6 and the second movable pulley 7 is relatively fixed, when the lower section of the first movable pulley 6 and the second movable pulley 7 does not hang weight
When code, the stress of optical fiber 8 is zero；When the underhung counterweight of the first movable pulley 6 and the second movable pulley 7,15 He of the first spring
Second spring 16 stretches, and the first movable pulley 6 and the second movable pulley 7 move down, and optical fiber 8 drawing effect occurs and realizes survey
Amount.The present embodiment is not construed as limiting the specific size and material of the first spring 15 and second spring 16, but when choosing, should examine
Consider the quality of counterweight applied when experiment, makes spring deformation occurs just may be used.
Specifically, the cross bar 101 of the present embodiment and the first vertical bar 102, the second vertical bar 103 are retractable structure.At this
It is selected due to first through hole 11 on perforated plate 10 and the second through-hole 12 in the embodiment of utility model, it can be because of first through hole
11 and second through-hole 12 distance influence the first fixed pulley 4 between first through hole 11,5 to the second through-hole 12 of the second fixed pulley it
Between optical fiber 8 wiring direction, to keep the two section optical fiber 8 to be able to maintain vertical direction, the present embodiment designs cross bar 101
At retractable structure, when the distance for meeting one group of through-hole of the present apparatus is different value, cross bar 101 can carry out the adjustment of adaptability.
In addition, the first vertical bar 102 and the second vertical bar 103 are designed to retractable structure, adjustable first fixed pulley 4 to first through hole
Between 11, between 5 to the second through-hole 12 of the second fixed pulley optical fiber 8 length, and then the stress section of optical fiber 8 is adjusted,
To adapt to different experiment demands.It is preferred as shown in Figures 1 and 2, further include being mounted on the in the bracket 1 of the present embodiment
The first base 104 of one vertical bar, 102 lower end and the second base 105 for being mounted on 103 lower end of the second vertical bar, 104 He of first base
The whole stability of bracket 1 can be improved in the design of second base 105, further ensures that going on smoothly for experiment.
Specifically, as shown in fig. 7, the optical fiber 8 in the present embodiment, which is equipped with, increases resistance point 17.In order to guarantee optical fiber 8 and model
Coupling between material makes result when strain testing be more nearly true value, in the test section of optical fiber 8, Mei Geyi
Section distance is arranged an increasing and hinders point 17, and increasing 17 set-up modes of resistance point of the present embodiment can be the adhesive tape using fixed width in optical fiber
Certain thickness is wound on 8, such as the spacing for increasing resistance point 17 is set as 10cm, is selected the adhesive tape of 8mm wide to wind optical fiber 8, is made it
Outer diameter increases 1mm.
As shown in Figure 8 and Figure 9, the utility model embodiment also provides a kind of fibre optical sensor prestressing force loading system, packet
The device in above-described embodiment is included, further includes optical frequency domain analysis instrument 18 and computer 19, in which: the input of optical frequency domain analysis instrument 18
End and output end are connect with the both ends of optical fiber 8 respectively, and output end sends the optical signal for measurement to optical fiber, and input terminal, which receives, to be surveyed
Optical signal after amount；Computer 19 is connect with optical frequency domain analysis instrument 18, for analyzing the optical signal after measuring.Light in the present embodiment
The stress test of fibre 8 is finally embodied in the variation of optical signal, and the analysis method used in the prior art is based on Brillouin's time domain
And the analytical technology of frequency domain, when optical fiber 8 certain a part strain change when, Brillouin shift changes therewith, connects
The brillouin scattering signal for receiving the point, the frequency domain for determining that energy transfer reaches corresponding when maximum on each section of region of optical fiber is poor,
To obtain strain information.The specific calculating process that the present embodiment is converted into strain information to frequency domain difference does not repeat them here, for
For those skilled in the art, the technology is known and applies often.
The utility model also provides a kind of experimental method using above-described embodiment device, is realized by following steps:
Step S101: by optical fiber one end by the clamping of the first wire fixing clamp after, the other end successively bypasses the first movable pulley, first fixed
After pulley, the second fixed pulley and the second movable pulley, clamped by the second wire fixing clamp.
This step is to install device as requested, it should be noted that the optical fiber in this method install after be in
Now naturally tight unstressed state.
Step S102: the both ends of optical fiber are connect with the input terminal of optical frequency domain analysis instrument and output end respectively；Optical frequency domain analysis
Instrument and calculating mechatronics, and open optical frequency domain analysis instrument and computer.
Optical fiber in device is connected with optical frequency domain analysis instrument, computer is also connected with optical frequency domain analysis instrument, is real
It tests and is ready work.
Step S103: optical frequency domain analysis instrument sends the optical signal for measurement to optical fiber, and receives the optical signal after measurement；
Computer analyzes optical signal.
One-time detection is carried out in the case where optical fiber does not stress, and is compared and analyzed with the detection of later period stress.
Step S104: below the first movable pulley and the second movable pulley simultaneously the equal counterweight of sprung mass.
Counterbalance mass selected by this step must be within optical fiber institute tolerance range, and the present embodiment is to the kind for selecting optical fiber
Class is not construed as limiting, can be ordinary optic fibre or armored fiber optic, when the present embodiment select armored fiber optic when, can suitably select quality compared with
Big counterweight is tested.Under normal circumstances, select quality within 3-25kg.
Step S105: step S103 is repeated.
After being applied with counterweight below the first movable pulley and the second movable pulley, optical frequency domain analysis instrument is sent to optical fiber again
For the optical signal of measurement, and the optical signal after measurement is received, simultaneous computer analyzes optical signal.
Step S104 and step S105 can also be performed a plurality of times in the present embodiment, and the counterbalance mass only hung every time should not
Together, the strain that optical fiber is occurred under different stress conditions could be compared as a result, to more quasi- to the force analysis of optical fiber
Really.The present embodiment only obtains more accurately analyzing result could bigger utility value in actual optical fiber measurement.
Step S106: experiment terminates.
The utility model also provides another experimental method for applying above-described embodiment device, is realized by following steps:
Step S201: padded coaming is loaded in pillar buoy bottom.
In the present embodiment, the loading of padded coaming is not limited, and the effect of buffering, specific material are only generated for perforated plate
It can refer to above embodiments.
Step S202: after optical fiber one end is clamped by the first wire fixing clamp, the other end is successively calmly sliding through the first movable pulley, first
After wheel, first through hole, the second through-hole, the second fixed pulley and the second movable pulley, clamped by the second wire fixing clamp；Perforated plate is horizontal positioned
Above the padded coaming in column type cylinder.
The present embodiment according to it is as above require by optical fiber cloth it is good after, it is perpendicular for should keeping section of the optical fiber between all parts
Histogram to.
Step S203: first part's cast material is loaded in pillar buoy.
What the weight of the first part's cast material loaded in this step should will be hung not less than later step
The weight of counterweight, to guarantee that perforated plate will not be moved up due to the pulling force of counterweight when subsequent step hangs counterweight.The present embodiment
Cast material preferably uses the sand of uniform ingredients, uses sand rain method when loading to guarantee the physico mechanical characteristic phase of cast material
Together.The soil of several heterogeneities can be selected also to simulate different geological stratifications in the cast material of the present embodiment, and specific design view is real
Depending on the requirement tested, herein without limitation.
Step S204: the both ends of optical fiber are connect with the input terminal of optical frequency domain analysis instrument and output end respectively；Optical frequency domain analysis
Instrument and calculating mechatronics, and open optical frequency domain analysis instrument and computer.
Step S205: optical frequency domain analysis instrument sends the optical signal for measurement to optical fiber, and receives the optical signal after measurement；
Computer analyzes optical signal.
This step optical fiber only by first part's cast material pressure when carry out a compressive strain measurement, can with
Face step measurement result compares calculating.
Step S206: below the first movable pulley and the second movable pulley simultaneously the equal counterweight of sprung mass.
The counterbalance mass applied below the first movable pulley and the second movable pulley in this step should be less than or equal to first
The quality of department pattern material guarantees that the position of measurement process middle punch plate is not moved.After counterweight is hung in this step,
Optical fiber by Weight gravity effect and tensional state is presented, and optical fiber in a stretched state stress act on when, to institute's stress
Strain effects are more preferably obvious, are also easier to measure.
Step S207: step S205 is repeated.
After being applied with counterweight below the first movable pulley and the second movable pulley, optical frequency domain analysis instrument is sent to optical fiber again
For the optical signal of measurement, and receive the optical signal after measurement, simultaneous computer analyzes optical signal, analyze optical fiber by
How its optical property changes after to the effect of Weight gravity, and refers to for later period measurement.
Step S208: second part cast material is loaded in the pillar buoy.
After being applied counterweight by step step S206, the optical fiber in tensional state loads second part mould in pillar buoy
During profile material, since the cast material on perforated plate top is more and more, compression suffered by optical fiber is also become larger, directly
It loads and completes to cast material.The present embodiment to the specific quality of first part's cast material and second part cast material or
Without limitation, the quality of first part's cast material is related to the quality of hung counterweight for volume, second part cast material
Quality is then related to this requirement of experiment, goes down to measure optical fiber to different quality (or composition, density in different requirement of experiment
Deng) cast material compressive strain response.Step S205 can be executed again after the completion of this step, obtain one-shot measurement as a result, with
The comparative analysis of experimental result later.
Step S209: the counterweight being suspended below the first movable pulley and the second movable pulley is laid down.
Since cast material acts on the frictional force of optical fiber, make originally the optical fiber in tensional state after counterweight is laid down simultaneously
Be not in apparent contraction, and gone in the state of fiber-draw detection model material to optical fiber apply pressure when optical fiber pressure
Strain, then can obtain more accurately as a result, this is because optical fiber in a stretched state for it is prestressed apply it is sensitiveer,
So the result of measurement is also more accurate.
Step S210: step step S205 is repeated.
The compression of cast material is measured to the optical fiber after counterweight is laid down, and then analyzes optical fiber in different stress feelings
For the measurement result of stress under condition, the analysis for experimental result should be that the result of all measurements in comprehensive this method carries out
It calculates analysis and draws a conclusion.
Step S211: experiment terminates.
The experimental method of the utility model embodiment, counterweight and the different quality that different quality can be selected are (or ingredient, close
Degree) cast material carry out many experiments, so that detection fiber is imitated in the strain by different tensile stresses and when compression
Fruit.Stratum deformation is measured for actual fiber, and accurately reference data is provided.
The utility model is further described by specific embodiment above, it should be understood that, have here
The description of body, should not be construed as the restriction to the spirit and scope of the utility model, and one of ordinary skilled in the art is readding
The various modifications made after reader specification to above-described embodiment belong to the range that the utility model is protected.
Claims (10)
1. a kind of fibre optical sensor prestressing force loading device, which is characterized in that including bracket, be fixedly mounted on the bracket
The first fixed pulley on the bracket and the second fixed pulley is fixedly mounted and for applying in first wire fixing clamp and the second wire fixing clamp
The first movable pulley and the second movable pulley of Prestressing；Wherein:
One end of optical fiber is clamped by first wire fixing clamp, and the other end successively bypasses first movable pulley, the first fixed cunning
After wheel, second fixed pulley and second movable pulley, clamped by second wire fixing clamp；
The equal counterweight of the underhung quality of first movable pulley and second movable pulley, to first movable pulley and
Second movable pulley generates downward pulling force, and then applies prestressing force to optical fiber.
2. a kind of fibre optical sensor prestressing force loading device as described in claim 1, which is characterized in that further include pillar buoy and
Perforated plate, in which:
The perforated plate lies in a horizontal plane in the middle and lower part in the pillar buoy, and the internal diameter phase of its outer diameter and the pillar buoy
Match；It is being bypassed on the perforated plate at least provided with the symmetrical first through hole in two positions and the second through-hole, the optical fiber
The first through hole on the perforated plate and second through-hole are sequentially passed through after first fixed pulley, further around excessively described
Two fixed pulleys；
Padded coaming is loaded below the perforated plate in the pillar buoy, is loaded above the perforated plate in the pillar buoy
There is the cast material of uniform ingredients.
3. a kind of fibre optical sensor prestressing force loading device as claimed in claim 2, which is characterized in that further include equipped with U-shaped
The coiling card slot of groove, in which:
The coiling card slot is mounted on the lower section of the perforated plate, and the both ends of the U-shaped groove respectively with the first through hole
Mutually it is connected with the second through-hole；
After the optical fiber passes through the first through hole, second through-hole is then passed through after entering the U-shaped card slot.
4. a kind of fibre optical sensor prestressing force loading device as described in any one of claims 1-3, which is characterized in that described
One movable pulley passes through the first spring respectively with second movable pulley and second spring is connect on the bracket.
5. a kind of fibre optical sensor prestressing force loading device as claimed in claim 4, which is characterized in that the bracket includes cross
Bar, the first vertical bar, the second vertical bar, in which:
The both ends of the cross bar are separately fixed at the upper end of first vertical bar and second vertical bar.
6. a kind of fibre optical sensor prestressing force loading device as claimed in claim 5, which is characterized in that the cross bar and described
First vertical bar, second vertical bar are retractable structure.
7. a kind of fibre optical sensor prestressing force loading device as claimed in claim 5, which is characterized in that the bracket further includes
First base and second base, in which:
The first base and the second base are separately mounted to the lower end of first vertical bar and second vertical bar.
8. a kind of fibre optical sensor prestressing force loading device as claimed in claim 4, which is characterized in that first wire fixing clamp
It is rubber wire fixing clamp with second wire fixing clamp.
9. a kind of fibre optical sensor prestressing force loading device as claimed in claim 4, which is characterized in that the optical fiber is equipped with
Increase resistance point.
10. a kind of fibre optical sensor prestressing force loading system, which is characterized in that including of any of claims 1-9
Device further includes optical frequency domain analysis instrument and computer, in which:
The input terminal and output end of the optical frequency domain analysis instrument are connect with the both ends of the optical fiber respectively, and the output end is to described
Optical fiber sends the optical signal for measurement, and the input terminal receives the optical signal after measurement；
The computer is connect with the optical frequency domain analysis instrument, for analyzing the optical signal after the measurement.
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| CN201920244592.XU CN209495662U (en) | 2019-02-27 | 2019-02-27 | A kind of fibre optical sensor prestressing force loading device and system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109990724A (en) * | 2019-02-27 | 2019-07-09 | 西安科技大学 | Prestressing force loading experimental apparatus, system and method based on distributed fiberoptic sensor |
| CN112372393A (en) * | 2020-11-17 | 2021-02-19 | 上海理工大学 | Multifunctional optical fiber polishing equipment |
| CN113959838A (en) * | 2021-09-15 | 2022-01-21 | 深圳市比洋光通信科技股份有限公司 | Stress monitoring method for optical fiber capillary tube |
| CN114859490A (en) * | 2022-05-30 | 2022-08-05 | 宜昌睿传光电技术有限公司 | Ultra-weak fiber grating prestressed optical cable and preparation method thereof |
-
2019
- 2019-02-27 CN CN201920244592.XU patent/CN209495662U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109990724A (en) * | 2019-02-27 | 2019-07-09 | 西安科技大学 | Prestressing force loading experimental apparatus, system and method based on distributed fiberoptic sensor |
| CN112372393A (en) * | 2020-11-17 | 2021-02-19 | 上海理工大学 | Multifunctional optical fiber polishing equipment |
| CN113959838A (en) * | 2021-09-15 | 2022-01-21 | 深圳市比洋光通信科技股份有限公司 | Stress monitoring method for optical fiber capillary tube |
| CN113959838B (en) * | 2021-09-15 | 2024-03-29 | 深圳市比洋光通信科技股份有限公司 | Method for monitoring stress of optical fiber capillary tube |
| CN114859490A (en) * | 2022-05-30 | 2022-08-05 | 宜昌睿传光电技术有限公司 | Ultra-weak fiber grating prestressed optical cable and preparation method thereof |
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