CN108844482B - Calibration platform of fiber grating sensor - Google Patents
Calibration platform of fiber grating sensor Download PDFInfo
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- CN108844482B CN108844482B CN201810968917.9A CN201810968917A CN108844482B CN 108844482 B CN108844482 B CN 108844482B CN 201810968917 A CN201810968917 A CN 201810968917A CN 108844482 B CN108844482 B CN 108844482B
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- 239000000835 fiber Substances 0.000 title claims abstract description 119
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims abstract description 34
- 230000006835 compression Effects 0.000 claims description 6
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- 238000005259 measurement Methods 0.000 abstract description 5
- 238000010030 laminating Methods 0.000 abstract description 2
- 239000013307 optical fiber Substances 0.000 description 56
- 238000010438 heat treatment Methods 0.000 description 42
- 238000003466 welding Methods 0.000 description 29
- 238000004806 packaging method and process Methods 0.000 description 22
- 238000003825 pressing Methods 0.000 description 22
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- 238000006073 displacement reaction Methods 0.000 description 11
- 230000005484 gravity Effects 0.000 description 10
- 238000001514 detection method Methods 0.000 description 9
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- 230000000694 effects Effects 0.000 description 6
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- 229910000679 solder Inorganic materials 0.000 description 6
- 230000001681 protective effect Effects 0.000 description 5
- 239000007787 solid Substances 0.000 description 5
- 230000004907 flux Effects 0.000 description 3
- 230000000149 penetrating effect Effects 0.000 description 3
- 238000002955 isolation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 238000005476 soldering Methods 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
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- 230000008878 coupling Effects 0.000 description 1
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- 238000000411 transmission spectrum Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
- G01B11/165—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge by means of a grating deformed by the object
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- General Physics & Mathematics (AREA)
- Length Measuring Devices By Optical Means (AREA)
- Optical Transform (AREA)
Abstract
The invention discloses a calibration platform of a fiber grating sensor, which relates to the calibration of the fiber grating sensor, and the key points of the technical scheme are as follows: including calibration pedestal, fix fixed bench on calibration pedestal, slide and connect and fix the coplanar movable fixed bench of upper surface at calibration pedestal and upper surface and fixed bench, be used for adjusting the stretching device that movable fixed bench kept away from each other with fixed bench and be used for measuring the distance measurement chi of distance between movable fixed bench and the fixed bench, movable fixed bench and fixed bench laminating and mutual butt, the light grating sensor both ends are fixed respectively on movable fixed bench and fixed bench. The invention has the characteristics of conveniently enabling the fiber grating sensor to quantitatively deform, and further improving the calibration precision.
Description
Technical Field
The invention relates to calibration of a fiber grating sensor, in particular to a calibration platform of the fiber grating sensor.
Background
The fiber grating sensor is a sensing process based on fiber gratings, obtains sensing information through the modulation of external physical parameters to fiber Bragg wavelength, and is a wavelength modulation type fiber sensor.
The prior fiber grating sensor comprises a frame piece and an optical fiber which is arranged on the frame piece in a penetrating way and is provided with a grating, wherein a welding groove is formed in the frame piece, the optical fibers at two ends of the grating are arranged above the welding groove and are filled with solder in the welding groove, after the wavelength of the grating is changed by stretching the optical fiber, the solder is heated and cooled, the frame piece and the optical fiber are welded, and the packaging is completed. The fiber grating sensor packages the grating in the frame sheet, so that the strength of fiber grating sensing is increased, and the fiber grating sensor is convenient for engineering construction.
After the sensor is packaged, the change of the wavelength displayed by the fiber bragg grating sensor and the physical change of the actual frame piece are required to be corresponding to obtain the proportionality coefficient between the sensor and the wavelength, the deformation of the actual frame piece is obtained through the proportionality coefficient after the output wavelength of the fiber is obtained through the demodulator, and then the deformation of the field measured equipment is obtained.
However, the fiber grating sensor has small ductility and is not easy to quantitatively stretch.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention aims to provide a calibration platform of a fiber grating sensor, which has the characteristic of being convenient for quantitatively deforming the fiber grating sensor.
The technical purpose is realized through following technical scheme, a calibration platform of fiber grating sensor, including calibration pedestal, fix fixed bench on calibration pedestal, slide and connect at calibration pedestal and upper surface and the coplanar movable fixation platform of upper surface of fixed bench, be used for adjusting the stretching device that movable fixation platform kept away from each other with fixed fixation platform to and be used for measuring the distance measurement chi of distance between movable fixation platform and the fixed fixation platform, movable fixation platform and fixed fixation platform laminating and mutual butt, the fiber grating sensor both ends are fixed respectively on movable fixation platform and fixed fixation platform.
Through above-mentioned technical scheme, fix fiber bragg grating sensor both ends respectively on fixed station and movable fixed station, make fixed station and movable fixed station mutually separate through stretching device, and then make fiber bragg grating sensor take place deformation, measure the distance between fixed station and the movable fixed station through the range finding chi, and then learn fiber bragg grating sensor's deformation volume.
Further, the stretching device comprises a rotating shaft fixed on one side of the movable fixing table far away from the fixed fixing table and a tensioning wire connected to the rotating shaft and the calibration pedestal.
Through the technical scheme, the fixing table can be driven to be far away from the fixing table by vertically pushing the tensioning wire, so that the fiber bragg grating sensor deforms, and the fiber bragg grating sensor can be controlled to deform because the tensioning wire is pushed vertically to move along the direction of the tensioning wire, so that the pushing distance is far greater than the moving distance of the actual moving fixing table.
Further, be provided with the book pole of L shape on the calibration pedestal, roll over the pole and rotate around the break point and be connected with the calibration pedestal, calibration bench threaded connection has thin tooth screw rod, thin tooth screw rod tip pastes in the one end of rolling over the pole, rolls over the pole other end and is provided with the fine setting axle, the fine setting axle pastes on compressing tightly the silk.
Through above-mentioned technical scheme, through the book pole of L shape, promote to roll over pole one end and can let roll over the pole other end synchronous rotation, and then promote taut silk, easy operation is convenient, simultaneously for directly promoting taut silk more stable, can let to promote to roll over the pole more stable through setting up thin tooth screw rod threaded connection on the one hand, on the other hand can reduce the distance of promoting the actuating lever through thin tooth and let fiber grating sensor's deformation littleer, has increased the calibration precision.
Further, the folding rod comprises a short rod and a long rod, the thin tooth screw rod is attached to the end portion of the long rod, and the fine adjustment shaft is attached to the compression wire.
Through above-mentioned technical scheme, through setting up the book pole into a length and a short long pole that passes through, let the short pole synchronous rotation, the displacement that long pole moved is greater than the displacement that the short pole moved with the short pole, has further enlarged the actual distance between the fixed station of promotion displacement and actual movement.
Further, the tensioning wire passes through the side face of the calibration pedestal at the two ends after bypassing the rotating shaft, and the two ends of the tensioning wire are fixed on the calibration pedestal.
Through above-mentioned technical scheme, fix on the calibration pedestal through tensioning silk both ends, the other end cover is in pivot epaxial mode, can promote when a compress tightly the silk, and the displacement variable quantity of pivot is less than the length that shortens of tensioning silk, has further enlarged the displacement of promotion and the multiplying power of moving the displacement between the fixed station.
Furthermore, the calibration pedestal is provided with guide rods parallel to each other on the surface close to the movable fixing pedestal, a chute is formed between the two guide rods, and a slide rod embedded in the chute is fixed on one surface of the movable fixing pedestal close to the calibration pedestal.
Through above-mentioned technical scheme, realize moving the slip connection of fixed station through slide bar and spout cooperation, it is difficult to the position offset to both sides to inject moving the fixed station simultaneously, reduces because the skew of moving the fixed station influences the calibration accuracy.
Further, the tightening device is used for enabling the fixed table and the movable fixed table to be in mutual abutting connection, and comprises a fixed column fixed on the fixed table, a connecting column fixed on the movable fixed table and a tension spring fixedly connected on the fixed column and the fixed table.
Through above-mentioned technical scheme, move the butt between fixed station and the fixed station under the realization nature state through tightening means, let both be close to each other, can let the spliced pole and fix between having the order about that is close to each other through the pulling force of extension spring, the spliced pole is located the bottom of moving the fixed station, is difficult for influencing fiber bragg grating sensor and moves the fixed of fixed station to and is difficult for influencing and move the fixed plate and fix the fixed plate and paste tightly each other.
Further, the fixed column passes and decides the fixed station, and fixed station one end is kept away from to the fixed column is provided with the stopper, and fixed column is kept away from stopper one end and is provided with the solid fixed ring that supplies the extension spring to fix.
Through above-mentioned technical scheme, pass the fixed column fixed station with the fixed station and can let the fixed station fix better, can be convenient for fix simultaneously and avoid fixed station upper surface.
The invention has the following technical effects:
1. the two ends of the fiber bragg grating sensor are respectively fixed on the fixed table and the movable fixed table, the fixed table and the movable fixed table are mutually separated through the stretching device, the fiber bragg grating sensor is further deformed, the distance between the fixed table and the movable fixed table is measured through the distance measuring ruler, the deformation quantity of the fiber bragg grating sensor is further known, and compared with the fact that the fiber bragg grating sensor is directly stretched, the fiber bragg grating sensor is easier to operate;
2. the driving displacement is far greater than the stretching displacement of the actual sensor through the tensioning device and the fine adjustment device, and the driving displacement and the stretching displacement of the actual sensor form a certain proportion because the stretching displacement required by the actual sensor is smaller, so that the operation is more convenient, and the calibration precision is higher;
3. through the setting of extension spring, solid fixed ring and spliced pole, can let fixed block and movable fixed block be close to each other and paste tightly, the measurement of the range finding chi of being convenient for.
Drawings
FIG. 1 is a schematic diagram of a fiber grating sensor according to an embodiment;
fig. 2 is an enlarged view of a portion a in fig. 1;
FIG. 3 is a schematic structural diagram of a fiber grating sensor fixing surface according to an embodiment;
FIG. 4 is a schematic view of a part of a fiber grating sensor inserted into a protection tube in an embodiment;
FIG. 5 is a schematic structural diagram of a packaging platform of a fiber grating sensor according to an embodiment;
FIG. 6 is a schematic structural diagram of a fixing structure of a fiber grating sensor according to an embodiment;
FIG. 7 is a schematic structural diagram of a force applying device of a fiber grating sensor according to an embodiment;
FIG. 8 is a schematic view of a structure of a fiber fixing jig according to an embodiment;
FIG. 9 is a schematic diagram of a structure in which a fiber fixing jig holds a fiber in an embodiment;
FIG. 10 is a schematic structural diagram of a calibration platform of a fiber grating sensor according to an embodiment;
FIG. 11 is an exploded view of a calibration platform for a fiber grating sensor according to an embodiment;
FIG. 12 is a schematic view of a part of the structure of a calibration platform of a fiber grating sensor according to an embodiment;
FIG. 13 is a schematic diagram showing a measurement state of the range finder in the embodiment;
FIG. 14 is a schematic view of a fixture for calibrating a platform according to an embodiment;
fig. 15 is a circuit diagram of the temperature control device in the embodiment.
Reference numerals: 1. an optical fiber; 10. a protective tube; 2. a frame sheet; 20. a fiber placement groove; 21. a welding groove; 22. a welding area; 23. spot welding grooves; 24. a deformation zone; 240. a deformation frame; 25. a protection zone; 250. an inner protection hole; 251. an outer protection hole; 3. packaging structure of fiber grating sensor; 30. a packaging seat; 31. a heat conduction table; 32. a limiting plate; 33. a thermal insulation gap; 34. a support; 340. a bottom plate; 341. a support plate; 342. a receiving plate; 343. a heat-insulating roller; 344. a heat insulating pipe; 35. a heat insulating mat; 36. a heating rod; 4. a packaging table; 40. a pressing member; 400. a compressing seat; 401. a pressing rod; 41. a lead post; 42. a heightening pad; 5. the fixing clamp is used for packaging the fiber bragg grating sensor; 50. a base; 51. a connecting plate; 510. a first vertex; 511. a second vertex; 512. a third vertex; 513. a fourth vertex; 52. a driving rod; 520. a hand-held part; 53. a pressing rod; 54. a mortgage rod; 55. a force-bearing rod; 56. a compression assembly; 560. adjusting a screw; 561. an adjusting nut; 562. an anastomotic plate; 6. the force application device is used for the fiber bragg grating sensor; 60. a fixed wheel plate; 61. a pulley; 62. a rotating shaft; 63. a gravitational member; 630. tying a fiber rod; 631. a connecting rod; 64. a receiving block; 65. a gravity block; 650. a mounting groove; 7. a calibration platform of the fiber grating sensor; 70. a calibration stand; 700. a slide rail; 701. a balancing stand; 71. a fixed table; 710. a through hole; 72. a movable fixing table; 720. a slide bar; 73. a distance measuring ruler; 74. a stretching device; 740. a tightening shaft; 741. tensioning the wire; 75. a fine tuning assembly; 750. folding the rod; 7500. a long rod; 7501. a short bar; 751. a fine tuning shaft; 752. a fine tooth screw; 76. a tightening device; 760. fixing the column; 761. a limiting block; 762. a fixing ring; 763. a connecting column; 8. a fixture for calibrating the platform; 80. a calibration seat; 81. a rotating shaft; 82. a mortgage base; 83. mortgage board; 84. a jackscrew; 85. rotating the handle; 9. a temperature control device; 90. a detection module; 91. a reference module; 92. a control module; 920. a manual control unit; 921. normally closed non-self-locking keys; 922. normally open non-self-locking keys; 923. a controller; 93. a heating module; 94. a reference display screen; 95. a real-time display screen; 96. an isolation transformer.
Detailed Description
Embodiment 1, referring to fig. 1 and 2, a fiber grating sensor includes a frame for packaging an optical fiber 1 and an optical fiber 1 penetrating through a frame sheet 2, where the frame may be provided in a cylindrical, flat or cubic shape, and in this embodiment, the frame sheet 2 is preferably in a flat shape, the flat frame sheet 2 can be conveniently fixed or installed to a device to be measured, a grating is engraved on the optical fiber 1 inside the frame sheet 2, after the grating is deformed, a spectrum passing through the grating will be changed, and a rear portion of the optical fiber 1 entering the frame sheet 2 will be reflected to form a reflection spectrum and a refraction spectrum. The deformation of the grating can be reflected by observing the change of the two spectrums, the grating is packaged on the frame piece 2, the frame piece 2 is attached to equipment to be measured, the slight deformation of the equipment can be sensed, and the deformation quantity of the equipment is further known through the change rule of the corresponding deformation and the spectrums.
Referring to fig. 1, a frame sheet 2 includes a package surface and a fixing surface, a fiber placement groove 20 is formed in the package surface along a length direction, an optical fiber 1 engraved with a grating is placed in the fiber placement groove 20, a welding groove 21 is formed at both ends of the fiber placement groove 20, a certain force is applied to both ends of the optical fiber 1, a certain amount of deformation is generated on the grating, a spectrum is observed by a fiber 1 grating demodulator, and the optical fiber 1 and the frame sheet 2 are fixed in the welding groove 21 after an expected state is reached. The packaging of the fiber bragg grating sensor is completed, when the frame piece 2 deforms, the grating deforms, the reflection spectrum and the transmission spectrum change, and the deformation of the frame can be obtained through the observation spectrum.
Referring to fig. 3, spot welding grooves 23 are respectively formed on two sides of the fixing surface, which are located on the frame piece 2, packaged fiber bragg grating sensors are attached to equipment to be measured, the packaged fiber bragg grating sensors are fixed on the equipment to be measured by spot welding machines on the spot welding grooves 23, after the equipment to be measured is deformed, the frame piece 2 drives the gratings to deform, and the deformation amount of the equipment can be known through observation of a spectrum.
Referring to fig. 1, in order to better fix the optical fiber 1, the frame sheet 2 is made of hard material, in this embodiment, steel is selected as the material of the frame sheet 2, the width of the lower part of the corresponding grating on the frame sheet 2 is smaller than the deformation area 24 of the width of the two ends of the frame sheet 2, the two ends of the deformation area 24 are rectangular deformation frames 240, which are used for reducing the rigidity of the frame, increasing the deformation of the deformation area 24, and utilizing the instability of the quadrangle shape to facilitate the deformation of the deformation frames 240. The width of the joint between the two ends of the deformation zone 24 and the deformation frame 240 is smaller than the width of the deformation, so that the stress points of the deformation frame 240 are smaller, and the deformation is easier. Referring to fig. 3 and fig. 4, the two deformed frames 240 are separated from each other by a welding area 22, the width of the joint between the welding area 22 and the deformed frame 240 is approximately equal to the width of the joint between the deformed frame 240 and the deformed area 24, at this time, two sides of the rectangular deformed frame 240 are approximately in a point connection relationship, and according to the characteristic of instability of the parallelogram, when the two sides stretch the frame 2, the deformed frame 240 is used to deform, so that the grating encapsulated on the frame 2 deforms. Spot welding grooves 23 are respectively formed in the two sides of the welding area 22 on the fixing surface, the packaged fiber bragg grating sensor is attached to equipment to be measured, the fiber bragg grating sensor is fixed on the equipment to be measured through a spot welder on the spot welding grooves 23, after the equipment to be measured deforms, the frame piece 2 drives the grating to deform, and the deformation amount of the equipment can be known through observation of a spectrum.
Referring to fig. 2, two welding areas 22 are respectively connected with a protection area 25 on one side far away from the deformation frame 240, an inner protection hole 250 is formed in the protection area 25, close to the welding groove 21, perpendicular to the frame piece 2 from the packaging surface, the inner protection hole 250 is communicated with the fiber placement groove 20 along the direction of the fiber placement groove 20, an outer protection hole 251 is formed in one end, far away from the welding groove 21, of the protection area 25, perpendicular to the frame piece 2 from the fixing surface, and the outer protection hole 251 is communicated with the fiber placement groove 20 along the direction of the fiber placement groove 20. The optical fiber 1 is inserted into the fiber placement groove 20 from one end of the outer protection hole 251 perpendicularly to the outer protection hole 251. The grating-engraved portion is placed at the deformation region 24, and after quantitative stretching, the optical fiber 1 and the frame sheet 2 are fixed in the welding groove 21. The optical fiber 1 is sleeved with a protective tube 10 at two ends, and the protective tube 10 penetrates into the protective area 25 vertically and externally through the protective hole 251 and contacts with the end part of the fiber placement groove 20. For protecting the optical fiber 1 from breakage.
In a specific implementation process, the optical fiber 1 carved with the grating is vertically rotated from the protection area 25 along the fiber placement groove 20 to sequentially pass through the outer protection hole 251 and the inner protection hole 250, is placed into the fiber placement groove 20, and is vertically penetrated out from the inner protection hole 250 and the outer protection hole 251 at the other end to the outer protection hole 251. The optical fibers 1 on two sides apply a certain force, so that an initial tensile force can be applied to the grating, the optical fibers 1 and the frame piece 2 are packaged in the welding groove 21, the sensor is attached to equipment to be measured, the sensor is fixed to the equipment to be measured through the spot welder from the spot welding groove 23, and when the equipment to be measured is deformed, the grating is driven to deform, the output spectrum is changed, and therefore the deformation amount of the equipment to be measured is known.
Referring to fig. 5, the fixing structure of the fiber bragg grating sensor comprises a package base 30 for placing the frame sheet 2, a heating device arranged on the package base 30 for heating the welding groove 21, and a temperature control device for controlling the heating temperature. The frame piece 2 is placed on the package base 30, and the soldering bath 21 is heated by the heating device, so that the solder in the soldering bath 21 is melted, and the frame piece 2 is fixed to the optical fiber 1. By controlling the temperature of the heating by means of the temperature control device, the risk of damage to the frame piece 2 and the optical fibers 1 due to too high a temperature or the risk of weak welding due to too low a temperature can be reduced.
Referring to fig. 6, the package base 30 includes two heat conducting tables 31 arranged in parallel, a heat insulating sheet is erected between the two heat conducting tables 31, heat insulating grooves for embedding the heat insulating sheet are formed in the two heat conducting tables 31, the upper surface of a heat insulating pad 35 is coplanar with the upper surface of the heat conducting table 31, the frame sheet 2 is partially placed on the heat insulating sheet, the welding groove 21 is attached to the heat conducting tables 31, a limiting plate 32 with an L-shaped cross section is arranged on one side, away from the deformation area 24, of the heat conducting tables 31 parallel to the heat conducting tables 31, a heat insulating gap 33 is formed between the limiting plate 32 and the heat insulating tables, a supporting piece 34 is arranged below the limiting plate 32 to support and fix the limiting plate 32, and a limiting groove for embedding the protection area 25 of the frame sheet 2 is formed in the limiting plate 32 to limit the left and right shaking of the frame sheet 2.
Referring to fig. 6, the supporting member 34 includes a bottom plate 340 located below the heat conducting platform 31, two ends of the bottom plate 340 are vertically fixed with supporting plates 341, the upper surface of the supporting plates 341 extends vertically inward to form a receiving plate 342, and the lower surface of the limiting plate 32 is attached to the receiving plate 342 and is fixedly connected with the receiving plate 342. Two heat-insulating rollers 343 are provided side by side sequentially passing through one supporting plate 341, two heat-conducting tables 31 and the other supporting plate 341, and a top thread 84 for fixing the heat-insulating rollers 343 is provided on the supporting plate 341 perpendicularly to the heat-insulating rollers 343. The heat insulation roller 343 penetrates into the heat conduction table 31 and the heat insulation pipes 344 are sleeved between the two heat conduction tables 31, the outer surfaces of the heat insulation rollers 343 are attached to the inner surfaces of the heat insulation pipes 344, and the outer surfaces of the heat insulation pipes 344 are attached to the heat conduction tables 31, so that the heat conduction tables 31 can be fixed and the heat conduction tables 31 can be supported, the heat conduction tables 31 are separated from the bottom plate 340, the heat conduction tables 31 are prevented from being conducted on the bottom plate 340, and operators are prevented from mistakenly touching the bottom plate 340 for scalding.
The heating device comprises a heating rod 36 penetrating through the heat conduction table 31, and the heating rod 36 is heated to heat the heat conduction table 31, so that the solder in the solder tank on the heat conduction table 31 is melted. The optical fiber 1 is fixed to the frame sheet 2.
The temperature control device includes a temperature sensor made of a thermocouple fixed on the heat conduction stage 31, and a temperature controller 923 coupled to the temperature sensor and the heating rod 36. When the temperature reaches a certain value, the heating of the heating rod 36 is stopped by the temperature controller 923. Avoiding damage to the frame piece 2 or damage to the optical fibers 1 due to excessive temperatures.
In order to facilitate packaging, referring to fig. 5 and 6, a packaging table 4 is further provided, the bottom surface of the bottom plate 340 is fixed on the packaging table 4, and a pressing member 40 is provided on the packaging table 4 between two corresponding heat conducting tables 31 located on the side surface of the bottom plate 340. The pressing member 40 includes a pressing seat 400 fixed on the encapsulation table 4 and a pressing bar 401 hinged on the pressing seat 400, the hinge point of the pressing bar 401 is located at the same horizontal plane with the frame sheet 2, and the pressing bar 401 is pressed on the frame sheet 2 by self-gravity through rotation. For preventing the encapsulation station 4 from tilting during encapsulation.
The specific implementation process is that the heat insulation pad 35 is placed in the heat insulation groove, the frame piece 2 is placed on the heat insulation pad 35, the limit groove is placed in the protection area 25 at the two ends of the frame piece 2, the welding groove 21 is attached to the heat conduction table 31, the heat conduction table 31 is heated by energizing the heating rod 36, the welding flux is melted and then stops heating, the melting point of the welding flux is known in advance, the temperature of the heat conduction table 31 is measured through the thermocouple, when the melting point of the welding flux is reached, the heating is stopped to fix the frame piece 2 and the optical fiber 1, and the packaging of the fiber bragg grating sensor is completed.
Referring to fig. 15, a temperature control device 9 includes a detection module 90, a reference module 91, a control module 92 coupled to the detection module 90 and the reference module 91, and a heating module 93 coupled to the control module 92, wherein the control module 92 includes a controller 923 coupled to the detection module 90, a manual control unit 920 coupled to the controller 923, and a preset unit coupled to the controller 923 for controlling the highest temperature, heating is started by the manual control unit 920, and a temperature value is preset by the preset unit, and when the temperature detected by the detection module 90 reaches the preset value, the controller 923 sends a power-off signal to stop heating.
The detection module 90 comprises a thermistor R3 and a voltage-dividing resistor R0 connected in series with the thermistor R3, the thermistor R3 and the voltage-dividing resistor R0 are connected to the controller 923, after the temperature of the thermistor R3 is changed, signals between the thermistor R3 and the voltage-dividing resistor R0 are changed, the detection module 90 sends out temperature signals, and when the temperature signals reach a preset value, the controller 923 controls the power-off, and the heating module 93 stops heating. The detection module 90 in this embodiment is implemented by a thermocouple.
The reference module 91 includes a variable resistor and a voltage dividing resistor R5 connected in series with the variable resistor, wherein the voltage drop between the variable resistor and the voltage dividing resistor is changed by changing the resistance value of the variable resistor, the variable resistor and the voltage dividing resistor R5 are connected to the controller 923, and a reference value is provided for the controller 923 by sending a preset reference signal.
The heating module 93 comprises a heating rod 36 connected in series with a controller 923, and the manual control unit 920 comprises a normally closed non-self-locking key 921 connected in series between the controller 923 and the heating rod 36, a normally open non-self-locking key 922 connected in series between the controller 923 and the heating rod 36, and a relay KM1 connected in series between the controller 923 and the heating rod 36, wherein a normally open contact KM1-1 of the relay is connected in parallel with the normally open non-self-locking key 922. When the normally open non-self-locking key 922 is pressed, the relay KM1 is powered, the heating rod 36 starts to heat, the normally open contact KM1-1 is closed, and the controller 923 continuously supplies power to the heating rod 36. In order to facilitate observation of whether the heating rod 36 is heating, indicator lamps L are connected in parallel to both ends of the heating rod 36, and when the circuit is on, the indicator lamps are turned on to know whether the heating rod 36 is operating. If the indicator lights are on but the heating rod 36 is not working, the heating rod 36 is proved to be faulty, so that the fault removal can be conveniently carried out when the equipment is faulty. When the detection signal reaches a preset value, the controller 923 changes the continuous current output into pulse signal output, when the controller 923 outputs a low level, the relay is powered off instantaneously, the normally open contact KM1-1 is restored to the off state, at this time, the heating rod 36 stops heating, and since both S1 and KM1-1 are in the off state at this time, the pulse signal of the controller 923 does not act on the heating rod 36, and the heating rod 36 is not heating. In the heating process of the heating rod 36, the normally closed non-self-locking key 921 is pressed, the relay is powered off instantaneously, and the normally open contact KM1-1 is restored to the off state, so that the power-off effect is achieved. Therefore, the circuit needs to be manually started, can be manually powered off, and can also be automatically powered off through the controller 923, so that the operation is more flexible.
In this embodiment, the controller 923 is a controller 923 with model REX-C100, and for safety in the circuit, an isolation transformer 96 is connected between the controller 923 and the room electricity, and the controller 923 is coupled with a real-time display screen 95 for displaying real-time temperature detected by the thermocouple and a reference display screen 94 for displaying preset values of the preset control module 92.
The utility model provides a packaging platform of fiber bragg grating sensor, refer to fig. 5, including encapsulation platform 4, fix the optical fiber 1 mounting fixture on encapsulation platform 4, and be used for tensile optical fiber 1's application of force structure, encapsulation seat 30 is fixed on encapsulation platform 4, place frame piece 2 on encapsulation seat 30, penetrate frame piece 2 with the optical fiber 1 that can have the grating, the front end passes through optical fiber 1 mounting fixture with optical fiber 1 fixing, optical fiber 1 other end is stretched optical fiber 1 through application of force device, after the grating is stretched to suitable position, package structure through optical fiber 1 grating with frame piece 2 and optical fiber 1 fixed encapsulation.
In order to make the packaging precision of the optical fiber 1 grating higher, the optical fiber 1 needs to be positioned on a straight line, the two ends of the packaging table 4, which are positioned at the packaging seat 30, are inserted with lead posts 41 for limiting the position of the optical fiber 1, in order to conveniently place the optical fiber 1 in the lead posts 41, the lead posts 41 are arranged in a staggered manner, the bottom of the optical fiber 1 fixing clamp is provided with a heightening pad 42, the upper surface of the heightening pad 42 is coplanar with the frame piece 2, the force application position of the force application device to the optical fiber 1 is positioned on the same plane as the frame piece 2, a receiving table is arranged between the force application device and the packaging seat 30, the upper surface of the receiving table is positioned on the same plane as the upper surface of the heightening pad 42, the lead posts 41 are inserted in a staggered manner on the receiving table, and the gap of the lead posts 41 is collinear with the force application direction of the optical fiber 1.
Referring to fig. 5, 8 and 9, a fixing clamp for packaging a fiber bragg grating sensor comprises a base 50 which is connected to a heightening pad 42 in a threaded manner, wherein a connecting plate 51 is vertically fixedly connected to the base 50, the connecting plate 51 is provided with 4 vertexes, one side far away from the base 50 is respectively provided with a first vertex 510 and a second vertex 511, the point which is shared with the second vertex 511 and is close to the base 50 is provided with a third vertex 512, the rest vertex is provided with a fourth vertex 513, the second vertex 511 is closer to the base 50 relative to the first vertex 510, the third vertex 512 is hinged with a driving rod 52 parallel to the connecting plate 51, the first vertex 510 is hinged with a pressing rod 53 parallel to the connecting plate 51, the end part of the pressing rod 53 is hinged with a mortgage rod 54, when the pressing rod 53 is perpendicular to the driving rod 52, the intersection point of the mortgage rod 54 and the pressing rod 53 coincides with the driving rod 52, and the other end of the mortgage rod 54 is parallel to the connecting plate 51 and is connected to one end far away from the connecting plate 51 of the driving rod 52 in a rotating manner. When the hold-down bar 53 is perpendicular to the drive bar 52, the mortgage bar 54 is parallel to the drive bar 52. The driving rod 52 is provided with a hand-held part 520 at one end far away from the connecting plate 51, and the pressing rod 53 is fixedly connected with a pressing component 56 at one end far away from the first vertex 510. The compressing assembly 56 comprises a stress rod 55 fixedly connected to one end, far away from the first vertex 510, of the compressing rod 53, an adjusting screw 560 is vertically connected to the stress rod 55, adjusting nuts 561 are arranged on the upper side and the lower side of the stress rod 55, an anastomotic plate 562 is fixedly connected to the bottom of the adjusting screw 560, the anastomotic plate 562 is conical, the bottom surface of the anastomotic plate 562 is attached to the heightening pad 42, the stress point of the conical anastomotic plate 562 is the upper surface with a smaller section, the section of the lower surface is larger, the stress of the stress point can be increased while the pressure intensity of the optical fiber 1 is reduced, and the optical fiber 1 with a weaker diameter is more used for fixing. The hand-held part 520 is pushed towards the direction of the anastomotic placode 562, the driving rod 52 drives the pressing rod 53 to push the mortgage rod 54 downwards in the rotating process, when the mortgage rod 54 is parallel to the driving rod 52, the pressing rod 53 is parallel to the driving rod 52, at the moment, the pressing rod 53 is perpendicular to the mortgage rod 54, the pressing rod 53 is pushed upwards, the pressing rod 53 drives the mortgage rod 54 to have upward acting force, but the driving rod 52 which is parallel to the mortgage rod 54 cannot rotate, the self-locking effect is achieved, and only when the driving rod 52 is pushed, the pressing component 56 on the mortgage rod 54 can be lifted, so that the fixing effect on the optical fiber 1 is better.
In order to improve the stability of fixing the optical fiber 1, the two compression rods 53 are respectively connected to two sides of the connecting plate 51 in a rotating way, the two driving rods 52 are respectively connected to two sides of the connecting plate 51 in a rotating way, the compression rods 53 are positioned on two sides of the driving rods 52, the two stress rods 55 are arranged on two sides of the adjusting screw 560, and the end parts of the two stress rods are fixed to the end parts of the compression rods 53 after being bent. The stress on two sides of the connecting plate 51 can be symmetrical, the stability is improved, the stress on the optical fiber 1 is more uniform, meanwhile, the adjusting screw 560 can slide along the stress rod 55 towards the direction close to or far from the connecting plate 51, and the relative position of the clamped optical fiber 1 can be controlled. A fixing piece is provided between the adjusting nut 561 and the force receiving rod 55.
The utility model provides a force application device for fiber grating sensor, combine FIG. 7, including fixing in encapsulation platform 4 edge, and be located the encapsulation seat 30 and deviate from the fixed fixture one side two L shape solid round plate 60, rotate the pulley 61 of supporting on solid round plate 60, and the gravity spare 63 of pulling optic fibre 1, two solid round plate 60 are relative and parallel arrangement, rotate between two fixed plates and support and have pivot 62, middle pulley 61 body coupling is on pivot 62, pulley 61 is located encapsulation seat 30 and keeps away from the fixed fixture one side, optic fibre 1 one end is fixed on encapsulation platform 4 through the fixed fixture, the other end is walked around pulley 61 and is sagged naturally, be located pulley 61 one end and be tied on gravity spare 63 with optic fibre 1, know the size of force application device to optic fibre 1 grating application of force through the gravity spare 63 of known quality. The amount of deformation of the grating is changed by changing the mass of the gravitational member 63.
The gravity piece 63 comprises a fiber tying rod 630, a connecting rod 631 vertically connected to the end of the fiber tying rod 630, a receiving block 64 connected to the end of the connecting rod 631, and a gravity block 65 for increasing or decreasing the gravity of the gravity piece 63, wherein a placement groove 650 is arranged on the gravity block 65, the connecting rod 631 is embedded into the placement groove 650, and the gravity block 65 is placed on the receiving block 64. The weight block 65 is marked with a corresponding weight to facilitate varying the force applied to the optical fiber 1.
The frame piece 2 is placed on the packaging seat 30, the optical fiber 1 passes through the frame piece 2, the grating is aligned with the deformation zone 24, one end of the optical fiber 1 is fixed by the fixing component, the optical fiber 1 passes through the lead post 41, the other end is wound on the fiber tying rod 630, the optical fiber 1 is adhered on the fiber tying rod 630 by using an adhesive tape, the optical fiber 1 is placed on the pulley 61, and a mass block with corresponding mass is added on the bearing block 64 according to the weight requirement. The heating rod 36 is powered, the solder is melted, and the optical fiber 1 is welded on the frame piece 2, so that the packaging of the fiber bragg grating sensor is completed.
Referring to fig. 10, the calibration platform of the fiber grating sensor is that the fiber grating sensor is stretched to deform, a spectrum is input into an optical fiber 1 of the fiber grating sensor, and a proportionality coefficient between wavelength variation and physical variation is obtained by observing that the variation of wavelength in a reflection spectrum and an output spectrum corresponds to the physical deformation of the fiber grating sensor. The calibration platform for fiber grating sensor includes calibration pedestal 70, fixed table 71 fixedly connected to the calibration pedestal 70, movable fixed table 72 connected to the calibration pedestal 70 in sliding mode and contacting with the fixed table 71, and two fixing clamps 8 fixed to the fixed table 71 and the movable fixed table 72 for calibrating the platform, wherein a distance measuring scale 73 (refer to fig. 13) attached to the movable fixed table 72 and used for measuring the gap between the movable fixed table 72 and the fixed table 71 is arranged through the fixed table 71, in this embodiment, an ID-S112B Sanfeng 543-690B digital dial gauge is selected, a through hole 710 is formed in the fixed table 71 for inserting the distance measuring scale 73, the measuring end of the dial gauge is inserted into the through hole 710 and attached to the movable fixed table 72, a stretching device 74 used for pulling the movable fixed table 72 is arranged at one end of the movable fixed table 72 away from the fixed table 71, and a tightening device 76 used for enabling the movable fixed table 72 and the fixed table 71 to have mutual approaching trend is arranged between the calibration pedestal 70 and the fixed table 71. The packaged fiber bragg grating sensor is placed at the joint of the fixed table 71 and the movable fixed table 72, the movable fixed table 72 and the fixed table 71 are tightly attached to each other through the tightening device 76, two ends of the fiber bragg grating sensor are respectively fixed on the fixed table 71 and the movable fixed table 72 through the fixed clamp 8 for calibrating the platform, the movable fixed table 72 is pulled away from the fixed table 71 through the stretching device 74, the deformation area 24 of the fiber bragg grating sensor is deformed, the changing distance between the fixed table 71 and the movable fixed table 72 is measured through the distance measuring ruler 73, the deformation amount of the fiber bragg grating 1 sensor is obtained, the deformation amount corresponds to the reflection spectrum and the output spectrum wavelength change amount in the fiber bragg grating 1, and the multiple groups of data are obtained through multiple tests, so that the proportionality coefficient K of the physical change amount X and the wavelength change amount of the fiber bragg grating sensor is obtained. The fiber grating sensor is attached to equipment with measurement, the sensor is deformed simultaneously after the equipment is deformed, and the physical change of the fiber grating sensor can be obtained according to the proportionality coefficient K and the wavelength change obtained by observing the spectrum.
Referring to fig. 12, slide rails 700 are provided on both sides of the alignment pedestal 70 corresponding to the surface of the movable fixing table 72, and a slide rod 720 capable of sliding in the slide rails 700 is fixed to the bottom of the movable fixing table 72, so that the movable fixing table 72 can slide on the alignment pedestal 70 through the slide rails 700.
The tightening device 76 includes two symmetrically arranged fixing columns 760 extending through the fixing table 71 to the moving table 72, one end of the fixing column 760 away from the moving table 72 is provided with a limiting block 761, the fixing column 760 can be prevented from moving towards the moving table 72, one end of the fixing column 760 close to the moving table 72 is provided with a fixing ring 762, two connecting columns 763 are fixed at positions corresponding to the fixing column 760 on the bottom of the moving table 72, and a tension spring (not shown in the figure) for enabling the moving table 72 and the fixing table 71 to abut against each other is fixedly connected between the connecting columns 763 and the fixing ring 762.
The stretching device 74 comprises a tensioning shaft 740 fixed at the bottom of the movable fixing table 72 and far from one side of the fixed fixing table 71, a balancing table 701 fixed on the fixed table base, tensioning wires 741 with two ends fixed on the balancing table 701 and bypassing the tensioning shaft 740, tensioning holes for the tensioning wires 741 to pass through are formed in the balancing table 701, and a fine adjustment assembly 75 for pushing the tensioning wires 741 to the direction perpendicular to the tensioning wires 741 is arranged on the movable fixing table 72. The tensioning wire 741 is vertically pushed by the fine adjustment assembly 75, so that the movable fixing table 72 is far away from the fixed fixing table 71, and the moving distance along the direction of the tensioning wire 741 can be far smaller than the vertical pushing distance because the direction of pushing the tensioning wire 741 is the vertical direction, so that the fiber grating sensor is convenient to stretch less, the magnitude order of physical deformation is reduced, and the calibration is convenient.
The fine tuning assembly 75 comprises a folding rod 750 rotatably connected to the calibration pedestal 70, the folding rod 750 rotates by taking a folding point as an axis, the folding rod 750 comprises a long rod 7500 and a short rod 7501 which are perpendicular to each other, the end part of the short rod 7501 is provided with a fine tuning shaft 751 positioned in the middle of two tensioning wires 741, a thin tooth screw 752 is in threaded connection with the end part of the corresponding long rod 7500 on the balance platform 701, the thin tooth screw 752 penetrates through the calibration pedestal 70 and is abutted to the end part of the long rod 7500, the long rod 7500 can be pushed by rotating the calibration pedestal 70, the short rod 7501 rotates synchronously with the long rod 7500, the short rod 7501 pushes the tensioning wires 741 to deform the tensioning wires 741, the movable fixing platform 72 moves away from the fixed platform 71, the deformation region 24 of the fiber grating sensor deforms due to the fact that the two ends of the fiber grating sensor are fixed on the fixed platform 71 and the movable fixing platform 72, and the output spectrum and the reflection spectrum of the fiber grating sensor can be changed at the same time, and the calibration is achieved through the correspondence of physical deformation and wavelength deformation.
In the specific implementation process, two ends of the fiber grating sensor are respectively fixed on the movable fixing table 72 and the fixed fixing table 71, the movable fixing table 72 is abutted against the fixed fixing table 71 through a tensioning device, the distance measuring rule 73 is inserted into the through hole 710 on the fixed fixing table 71 and is abutted against the movable fixing table 72, the thin tooth screw 752 is rotated, the long rod 7500 is pushed, the short rod 7501 synchronously rotates, the fine adjustment shaft 751 pushes the tensioning wire 741, the movable fixing table 72 is further away from the fixed fixing table 71, the deformation area 24 of the fiber grating sensor is deformed, and the indication on the distance measuring rule 73 is read to compare the reflection spectrum of the optical fiber 1 and the wavelength of the output spectrum. And obtaining the coefficients of the physical deformation and the wavelength change through multiple groups of data, and completing calibration.
The fixing clamp 8 for the calibration platform is combined with fig. 14, the movable fixing table 72 and the fixed fixing table 71 on the calibration platform are both provided with the fixing clamp 8 for the calibration platform, in this embodiment, the movable fixing table 72 is the same as the fixing clamp 8 for the calibration platform on the fixed fixing table 71, wherein the fixing clamp 8 for the calibration platform arranged on the movable fixing table 72 comprises a cuboid calibration seat 80 with one end in threaded connection with the movable fixing table 72, the other end of the calibration seat 80 is rotationally connected with a rotating shaft 81, one end of the rotating shaft 81 is inserted into the calibration seat 80, the other end is rotationally connected with a cuboid mortgage seat 82, one end, close to the mortgage seat 82, of the mortgage seat is fixedly connected with a mortgage plate 83 for fixing the fiber bragg grating sensor, the mortgage plate 83 is abutted on the fiber bragg grating sensor, one end of the mortgage seat 82 is far away from the fiber bragg grating sensor is in threaded connection with a jackscrew 84, one end of the jackscrew 84 is abutted on the movable fixing table 72, and the other end is provided with a rotating handle 85. Through rotatory jackscrew 84, mortgage seat 82 is kept away from fiber bragg grating sensor one end and is moved to keeping away from movable fixed station 72 direction, and mortgage board 83 will compress tightly fiber bragg grating sensor, reaches fixed effect, in order to reach better fixed effect, the distance between jackscrew 84 and the axis of rotation 81 is greater than the distance between axis of rotation 81 and the mortgage board 83 far away, realizes leverage, increases the effort between mortgage board 83 and the fiber bragg grating sensor.
In order to make the surface of the mortgage 83 stick to the surface of the fiber bragg grating sensor when the mortgage 83 compresses the fiber bragg grating sensor, the mortgage 83 is rotatably connected with the mortgage seat 82, so that damage to the fiber bragg grating sensor caused by the corner of the mortgage 83 can be prevented.
In a specific implementation process, the fiber grating sensor is placed on the movable fixing table 72 and the fixed fixing table 71, the calibration seats 80 on the two fixing clamps 8 for calibrating the platform are respectively fixed on the movable fixing table 72, the jackscrews 84 are screwed into one end of the mortgage seats 82 far away from the fiber grating sensor and are abutted on the movable fixing seat, and the mortgage plates 83 are abutted on the fiber grating sensor so as to fix the fiber grating sensor.
The present embodiment is only for explanation of the present invention and is not to be construed as limiting the present invention, and modifications to the present embodiment, which may not creatively contribute to the present invention as required by those skilled in the art after reading the present specification, are all protected by patent laws within the scope of claims of the present invention.
Claims (3)
1. The utility model provides a calibration platform of fiber grating sensor which characterized in that: the device comprises a calibration pedestal (70), a fixed table (71) fixed on the calibration pedestal (70), a movable fixed table (72) which is connected to the calibration pedestal (70) in a sliding manner and has the upper surface coplanar with the upper surface of the fixed table (71), a stretching device (74) for adjusting the movable fixed table (72) and the fixed table (71) to be separated from each other, and a distance measuring ruler (73) for measuring the distance between the movable fixed table (72) and the fixed table (71), wherein the movable fixed table (72) is attached to the fixed table (71) and is abutted against each other, two ends of a light grating sensor are respectively fixed on the movable fixed table (72) and the fixed table (71), the stretching device (74) comprises a tensioning shaft (740) fixed on one side of the movable fixed table (72) far away from the fixed table (71), a balancing table (701) fixed on the fixed pedestal, and tensioning wires (741) with two ends fixed on the balancing table (701) and bypassing the tensioning shafts (740), and tensioning holes for the tensioning wires (741) to pass through are arranged on the balancing table (701). A fine adjustment assembly (75) for pushing the tensioning wire (741) to a direction perpendicular to the tensioning wire (741) is arranged on the movable fixing table (72); the tensioning wire (741) is vertically pushed by the fine adjustment assembly (75), so that the movable fixing table (72) is far away from the fixed fixing table (71); the fine adjustment assembly (75) comprises a folding rod (750) which is rotatably connected to the calibration pedestal (70), the folding rod (750) rotates by taking a folding point as an axis, the folding rod (750) comprises a long rod (7500) and a short rod (7501) which are perpendicular to each other, the end part of the short rod (7501) is provided with a fine adjustment shaft (751) which is positioned between two tensioning wires (741), the fine adjustment shaft (751) is attached to the compression wires, a fine tooth screw (752) is in threaded connection with the end part of the corresponding long rod (7500) on the balance table (701), the fine tooth screw (752) passes through the balance table (701) and is abutted to the end part of the long rod (7500), the long rod (7500) can be pushed by rotating the fine tooth screw (752), the short rod (7501) and the long rod (7500) synchronously rotate, and the fine adjustment shaft (751) pushes the tensioning wires (741), so that the tensioning wires (741) deform, and the movable fixing table (72) moves away from the fixed fixing table 71; both ends of the tensioning wire (741) are fixed on the balance table (701); the tightening device (76) comprises a fixed column (760) fixed on the fixed table (71), a connecting column (763) fixed on the movable table (72) and a tension spring fixedly connected on the fixed column (760) and the fixed table.
2. The fiber grating sensor calibration platform of claim 1, wherein: the two sides of the surface of the calibration pedestal (70) corresponding to the fixed table (72) are respectively provided with a sliding rail (700), a sliding rod (720) capable of sliding in the sliding rail (700) is fixed at the bottom of the movable fixed table (72), and the movable fixed table (72) can slide on the calibration pedestal (70) through the sliding rail (700).
3. The fiber grating sensor calibration platform of claim 1, wherein: the fixed column (760) passes fixed platform (71), and fixed column (760) keep away from fixed platform (71) one end and are provided with stopper (761), and fixed column (760) keep away from stopper (761) one end and are provided with fixed ring (762) that supply the extension spring to fix.
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