CN208075789U - A kind of Brillouin light fiber sensor system strain calibrating installation - Google Patents
A kind of Brillouin light fiber sensor system strain calibrating installation Download PDFInfo
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- CN208075789U CN208075789U CN201820598073.9U CN201820598073U CN208075789U CN 208075789 U CN208075789 U CN 208075789U CN 201820598073 U CN201820598073 U CN 201820598073U CN 208075789 U CN208075789 U CN 208075789U
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- optical fiber
- fibre
- sliding block
- mobile sliding
- strain
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Abstract
The utility model discloses a kind of Brillouin light fiber sensor systems to strain calibrating installation.The utility model includes servo motor, ball-screw, fibre holder immobilising device, fibre holder, firm banking, mobile base, clamping fixture table, mobile sliding block, grating scale, grating scale immobilising device.The utility model drives ball screw turns by servo motor, make to be fixed on the mobile sliding block on guide rail and generates horizontal movement, and then the single mode bare fibre being fixed on mobile sliding block is made to generate strain displacement, grating scale reads fibre strain displacement, by comparing reading value and preset value, after reaching reduction range, controller brake servo motor gradually slows down, preset displacement value is eventually arrived at, realizes and known fixed strain is applied to optical fiber.It is compared to the prior art, utility model device is simple in structure, easy to operate, has the characteristics that positioning accuracy, the depth of parallelism and straightness height, backhaul gap bottom.
Description
Technical field
The utility model is related to a kind of calibrating installations suitable for coal mine Fibre Optical Sensor type safety monitoring system, especially
It is related to a kind of strain calibrating installation based on Brillouin light fiber sensor system.
Background technology
Include mainly currently based on optical fiber sensing technology：Rayleigh scattering, Raman scattering and Brillouin scattering；Rayleigh scattering
Optical fiber sensing technology can only measure loss and the breakpoint of optical fiber, be unable to the physical quantitys such as measuring temperature and strain, and be dissipated based on Raman
The Fibre Optical Sensor for penetrating principle is one of technology the most ripe in distributing optical fiber sensing, and the optical signal of Raman scattering is relatively
It is weak, therefore detect more difficult and only temperature sensitive, it is difficult to the fields such as geology, building structure for needing stress mornitoring
It closes.Brillouin scattering is all sensitive to temperature and strain, and temperature and strain can cause the frequency offset phenomena of original optical signal therefore to lead to
It crosses and measures frequency displacement calibration to fiber optic temperature-frequency displacement coefficient, strain-frequency displacement coefficient, Brillouin light fiber sensor system may be implemented
Other sensing technologies are above in terms of measurement accuracy, measurement range and spatial resolution.Brillouin scattering optical signal is to temperature
The method of degree/strain cross sensitivity, common separation temperature/strain is by detecting Brillouin scattering signal frequency shift amount and power
Temperature/strain separation is realized in variation, but power detection is easily disturbed, stability is bad, and since temperature is to Brillouin signal frequency
It moves and the sensitivity coefficient of power is much larger than strain sensitive coefficient, the error of frequency displacement and power detection can bring strain testing result
Larger impact.Therefore it to realize to the calibration of strain-frequency displacement coefficient, very high requirement is equipped with to fibre strain calibration cartridge.
Traditional fibre strain detection device stretching optical fiber by the way of suspension counterweight vertically, gives the fixed drawing of optical fiber
Power realizes the measurement to fibre strain by detecting Brillouin frequency shifts amount.Device provides fixing axle by counterweight to optical fiber
Xiang Li, fibre strain coefficient CεIt is known that by formula F=Cε× Δ x is (in formula：F-power；Cε- fibre strain coefficient；Δ x-optical fiber
Strain displacement amount.) the theoretical strain displacement amount Δ x of optical fiber can be obtained.It follows that device cannot directly make optical fiber generation fixed
Strain, can only provide theoretical value, cause apparatus system error；In addition device is converted into the power of counterweight vertical direction by pulley
The power of horizontal direction, it could be theoretically argued that the size of two direction force is equal, since pulley frictional force makes horizontal direction power subtract
It is small, cause apparatus system error；In addition device provides different pulling force to optical fiber, causes device flexibility by replacing counterweight
Difference, measurement range are small.Therefore, developing a set of Brillouin light fiber sensor system strain calibrating installation seems particularly important.
Invention content
The utility model is directed to and cannot directly acquire the dependent variable of optical fiber in the prior art and lead to strain-frequency displacement coefficient meter
It does not calculate accurately really, and then influences the demodulation accuracy of Brillouin light fiber sensor system dependent variable, the purpose of this utility model is that developing
A set of Brillouin light fiber sensor system strains calibrating installation, by applying known standard strain to optical fiber, in conjunction with Brillouin light
Fiber sensor system obtains the frequency shift amount of Brillouin scattering optical signal in optical fiber, and then obtains strain-frequency displacement coefficient, and then realization pair
Fibre-optical sensing device strains the calibration of parameter.
The technical solution of the utility model：
The utility model includes servo motor, ball-screw, fibre holder immobilising device, fibre holder, fixed bottom
Seat, mobile base, clamping fixture table, mobile sliding block, grating scale, grating scale immobilising device；Two fibre holders are clamped by optical fiber
Device fixing piece is separately fixed on mobile sliding block and clamping fixture table, for fixing bare fibre；One end of single mode bare fibre is by moving cunning
Fibre holder on block is fixed, and the other end is fixed by the fibre holder on clamping fixture table, and bare fibre to be measured is made to be in pre-
Tight state；Bare fibre initial length l to be measured is equal to the length between the optical fiber hold-down bars end of two fibre holders at this time；Institute
The clamping fixture table stated is highly consistent with mobile sliding block and fixes always, and grating ruler reading head is fixed on mobile cunning by grating scale fixing piece
On block, grating ruler reading head is used to read the relative shift of mobile sliding block, and servo motor is made by driving ball screw turns
Mobile sliding block generates axial movement, and then single mode bare fibre is driven to generate a certain amount of relative shift Δ l, reaches and is applied to optical fiber
The relationship of the effect of the quasi- strain stress of mark-on, relative shift Δ l and dependent variable ε is ε=Δ l/l.
Furtherly, it includes optical fiber fixing piece, optical fiber hold-down bars and screw, optical fiber that the fibre holder, which fixes optical fiber,
Hold-down bars fixes bare fibre by crack, and optical fiber hold-down bars is screwed on optical fiber fixing piece.
Compared with the background art, the utility model has the beneficial effects that：
1. the fibre strain calibrating installation in the utility model has positioning accurate compared with traditional fiber strains calibrating installation
The feature that degree, the depth of parallelism and straightness are high, backhaul gap is low, and accurately optical fiber can be applied arbitrary in range ability
Standard strains.
2. being compared to traditional fibre strain calibrating installation, the present apparatus directly measures the relative shift of optical fiber, passes through
Displacement calculation dependent variable can meet and apply standard strain to 2-3m testing fibers, optical fiber is made to generate 500-15000 μm of position
It moves, minimum division value is 1 μm.
3. fixing single mode bare fibre using fibre holder in the utility model, the mode of the fixed single mode bare fibre of tradition is
Single mode bare fibre is pasted onto on fixing piece with instant drying adhesive, the present apparatus is flexible with adjustment by comparison, it is small to be damaged to optical fiber
Feature.
4. the displacement in the utility model is read and the adjustment of servo motor operating parameter, user can be on software interface
The adjusting for carrying out relevant parameter realizes the acquisition to displacement data using serial ports.Testing result shows on software interface, in real time
Property and detection efficiency it is high, detection method is simple to operation, monitors the relative shift of single mode bare fibre in real time, to accurately control
The size of the standard dependent variable applied.
Description of the drawings
Fig. 1 is Brillouin light fiber sensor system strain calibrating installation dimensional structure diagram.
Fig. 2 is the fibre holder structure chart of the utility model.
Fig. 3 is the Hardware Design block diagram of the utility model.
Fig. 4 is the control system flow chart of the utility model.
Fig. 5 is the path profile of tracing to the source of the utility model.
Specific implementation mode
Below in conjunction with attached drawing, the utility model is described in further detail.
As illustrated in fig. 1 and 2, fibre holder 8,13 is placed in clamping fixture table 10 respectively by fibre holder fixing piece 9,14
On mobile sliding block 12, for fixing bare fibre, bare fibre to be measured is set to be in certain pre-strained state, at this time bare fibre to be measured
Initial length l is equal to the length between the hold-down bars end of two fibre holders.Clamping fixture table 10 is fixed on mobile base 7, leads to
It crosses mobile base 7 and changes the distance between clamping fixture table 10 and firm banking 6, meet and measure the strain of different length single mode bare fibre
It is required that clamping fixture table 10 is consistent with mobile 12 upper level of sliding block and fixes always, servo motor 1 is fixed on retarder 2
Determine on pedestal 6, ball-screw 16 is placed in by leading screw fixing piece 11 on firm banking 6, and servo motor 1 and retarder 2 are given
Bare fibre provides axial tension, by driving ball-screw 16 to rotate, and then make ball screw 16 drive mobile sliding block 12 along
15 direction of guide rail generates axial displacement, and then bare fibre is driven to generate a certain amount of standard displacement, and grating scale includes optical grating calibration
Ruler 3 and grating ruler reading head 4, grating mark scale 3 are fixed on firm banking 6, and grating ruler reading head 4 is fixed by grating scale
Part 5 is fixed on mobile sliding block 12, and grating ruler reading head 4 is for the real-time relative shift for reading mobile sliding block 12 and is uploaded to
Host computer carries out data processing.
As shown in Fig. 2, the fibre holder in the present embodiment includes screw 17, optical fiber hold-down bars 18, optical fiber fixing piece 19.
Optical fiber hold-down bars 18 fixes bare fibre by crack, and crack size determines according to the diameter of the bare fibre of different model, can be with
It realizes the clamping to bare fibre to be measured in the present apparatus, corresponds to actual needs.Optical fiber hold-down bars 18 is fixed on optical fiber by screw 17
On fixing piece 19, rotation screw 17 gives optical fiber hold-down bars 18 certain radial load, and optical fiber hold-down bars can both be fixed by reaching
18 do not damage the effect of bare fibre again simultaneously.
As shown in figure 3, STM32 microcontrollers are exported by PWM, control servomotor 1 is with pre-set velocity value uniform rotation, band
Dynamic ball-screw 16 rotates, and then mobile sliding block 12 and fibre holder 13 is driven to move, and bare fibre is made to generate standard displacement
Δl.Grating ruler reading head 4 is fixed on mobile sliding block 12, the relative shift for reading mobile sliding block, and by measurement result
It is transferred to STM32 microcontrollers by serial communication circuit.By comparing shift value and preset displacement value is read, deceleration model is reached
After enclosing, controller brake servo motor 1 is gradually slowed down, and preset displacement value is finally reached, according to standard dependent variable ε and standard
Relational expression ε=Δ l/l of displacement l acquires standard dependent variable ε, that is, realizes and apply known standard strain stress to optical fiber, in conjunction with cloth
In deep optical fiber sensing system obtain the frequency shift amount of Brillouin scattering optical signal in optical fiber, and then obtain strain-frequency displacement coefficient, also may be used
Realize the calibration that parameter is strained to Brillouin light fiber sensor system.
As shown in figure 4, mobile slider displacement value and servo motor rotating speed are arranged in the host computer interface of control system
Value, servo motor 1 drive ball-screw 14 to rotate, and so that mobile sliding block 10 is moved by setting speed, grating ruler reading head 4 detects phase
It is uploaded to control system to displacement and by detected value, control system is slowed down by whether contrasting detection value reaches setting shift value
Range, brake servo motor gradually slow down, whether contrasting detection value reaches setting shift value, complete brake servo motor, this
Series of steps is realized applies known standard strain to optical fiber.
As shown in figure 5, the utility model can realize the calibration for straining parameter to Brillouin fiber optic strain sensing system, strain
Parameter can be traced to the source by the present apparatus to national length standard step by step.
Claims (2)
1. a kind of Brillouin light fiber sensor system strains calibrating installation, including servo motor, ball-screw, fibre holder are fixed
Device, fibre holder, firm banking, mobile base, clamping fixture table, mobile sliding block, grating scale, grating scale immobilising device, it is special
Sign is：
Two fibre holders are separately fixed at by fibre holder fixing piece on mobile sliding block and clamping fixture table, naked for fixing
Optical fiber；One end of single mode bare fibre is fixed by the fibre holder moved on sliding block, and the other end is clamped by the optical fiber on clamping fixture table
Device is fixed, and bare fibre to be measured is made to be in pre-strained state；Bare fibre initial length l to be measured is equal to two fibre holders at this time
Optical fiber hold-down bars end between length；The clamping fixture table is highly consistent with mobile sliding block and fixes always, and grating scale is solid
To determine part to be fixed on mobile sliding block grating ruler reading head, grating ruler reading head is used to read the relative shift of mobile sliding block,
Servo motor makes mobile sliding block generate axial movement, and then single mode bare fibre is driven to generate one by driving ball screw turns
Quantitative relative shift Δ l achievees the effect that apply standard strain stress, the pass of relative shift Δ l and dependent variable ε to optical fiber
System is ε=Δ l/l.
2. Brillouin light fiber sensor system according to claim 1 strains calibrating installation, it is characterised in that：The optical fiber
It includes optical fiber fixing piece, optical fiber hold-down bars and screw that clamper, which fixes optical fiber, and optical fiber hold-down bars fixes bare fibre, light by crack
Fine hold-down bars is screwed on optical fiber fixing piece.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820598073.9U CN208075789U (en) | 2018-04-25 | 2018-04-25 | A kind of Brillouin light fiber sensor system strain calibrating installation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820598073.9U CN208075789U (en) | 2018-04-25 | 2018-04-25 | A kind of Brillouin light fiber sensor system strain calibrating installation |
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| CN208075789U true CN208075789U (en) | 2018-11-09 |
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| CN201820598073.9U Expired - Fee Related CN208075789U (en) | 2018-04-25 | 2018-04-25 | A kind of Brillouin light fiber sensor system strain calibrating installation |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110332902A (en) * | 2019-07-15 | 2019-10-15 | 中国地质大学（武汉） | A kind of friction pile deformation monitoring fixes device and method with distribution type fiber-optic |
| CN113720445A (en) * | 2021-07-16 | 2021-11-30 | 内蒙古普析通用仪器有限责任公司 | Photometer grating control mechanism based on direct current motor and encoder and driving method |
-
2018
- 2018-04-25 CN CN201820598073.9U patent/CN208075789U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110332902A (en) * | 2019-07-15 | 2019-10-15 | 中国地质大学（武汉） | A kind of friction pile deformation monitoring fixes device and method with distribution type fiber-optic |
| CN113720445A (en) * | 2021-07-16 | 2021-11-30 | 内蒙古普析通用仪器有限责任公司 | Photometer grating control mechanism based on direct current motor and encoder and driving method |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20181109 |