CN111736281A - Fiber grating array temperature measurement optical cable for solving problem of excess length and process - Google Patents
Fiber grating array temperature measurement optical cable for solving problem of excess length and process Download PDFInfo
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- CN111736281A CN111736281A CN202010568464.8A CN202010568464A CN111736281A CN 111736281 A CN111736281 A CN 111736281A CN 202010568464 A CN202010568464 A CN 202010568464A CN 111736281 A CN111736281 A CN 111736281A
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- spiral
- movable pulley
- optical cable
- protective sleeve
- limit switch
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4479—Manufacturing methods of optical cables
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4439—Auxiliary devices
- G02B6/444—Systems or boxes with surplus lengths
Abstract
The invention discloses a process for solving the problem of excess length of a fiber grating array temperature measurement optical cable, which comprises the following steps: while the spiral sheath tube is formed, the array grating optical fiber is penetrated into the spiral sheath tube; a forming end and a take-up end of the spiral protective sleeve are respectively provided with a fixed pulley, and a group of movable pulley balancing weights with adjustable quality is arranged below the space between the two fixed pulleys; under the action of gravity of the movable pulley balancing weight, the take-up speed of the forming end and the take-up end is controlled, so that the spiral protective sleeve is in a stretching state, and the extra length of the array grating optical fiber in the spiral protective sleeve is controlled.
Description
Technical Field
The invention belongs to the technical field related to fiber grating sensing, and mainly introduces a novel process structure capable of solving the problem of excess length of a continuous fiber grating array temperature measurement sensing optical cable.
Background
With the development of the fiber grating sensing technology, the continuous array grating sensing technology gradually replaces the application of the traditional distributed sensing fiber and the point type Bragg strong grating sensor in the related fields due to the technical characteristics of high capacity, high precision, long distance and high reliability, and also meets the requirement of the high-speed development of the internet of things era.
Then, the packaging process of the large-capacity fiber grating array sensing optical cable, in particular to the research of the array grating temperature measuring optical cable widely applied to the temperature measuring field, is not mature at present, and the sensing optical cable manufactured by adopting the traditional communication optical cable cabling technology has the problems of uncontrollable negative excess length and excess length, which causes the stress failure of the grating in the array grating sensing optical cable in engineering construction.
The problem of the extra length of the array grating is to be solved in order to solve the problem of the internal stress failure of the array grating sensing optical cable. The array grating temperature measurement sensing optical cable is different from the traditional communication optical cable, because the grating array has double sensitivity of the grating to stress-temperature, the influence of the stress on the grating needs to be solved to realize the temperature measurement function, the internal structure for packaging the grating needs no traditional factice or fabric filling mode of the communication optical cable, and the solution of the extra length of the general communication optical cable is realized just by various filling modes, so the cabling process of the array grating temperature measurement optical cable has no requirement on the method and has certain technical difficulty.
Therefore, a new optical cable process structure needs to be developed to solve the problem of extra length by applying the array grating temperature measurement sensing technology to engineering well.
Disclosure of Invention
The invention aims to solve the problem of excess cabling length of a fiber grating array temperature measurement sensing optical cable.
In order to achieve the purpose, the invention provides a process for solving the problem of extra length of a fiber grating array temperature measurement optical cable, which comprises the following steps:
while the spiral sheath tube is formed, the array grating optical fiber is penetrated into the spiral sheath tube;
a forming end and a take-up end of the spiral protective sleeve are respectively provided with a fixed pulley, and a group of movable pulley balancing weights with adjustable quality is arranged below the space between the two fixed pulleys;
under the action of the gravity of the movable pulley balancing weight, the take-up speed of the take-up end is controlled, so that the spiral protective sleeve is in a stretching state, and the extra length of the array grating optical fiber in the spiral protective sleeve is controlled.
According to the technical scheme, the spiral protective sleeve is a dry non-filled stainless steel sleeve.
According to the technical scheme, a plurality of reinforcing ribs are arranged in the spiral protecting pipe.
The invention also provides a fiber grating array temperature measuring optical cable which comprises a bare fiber and a spiral protective sleeve, wherein the fiber grating array is engraved on the bare fiber and encapsulated in the spiral protective sleeve.
The invention also provides an optical fiber extra length processing device for realizing the process for solving the problem of the extra length of the optical fiber grating array temperature measuring optical cable in the technical scheme, wherein the optical cable processing device comprises a bracket, two fixed pulleys are fixed on the bracket, one fixed pulley is used as a positioning guide wheel at the forming end of the spiral protective sleeve, and the other fixed pulley is used as a positioning guide wheel at the take-up end of the spiral protective sleeve;
the optical cable processing device also comprises a control system for controlling the winding and unwinding speeds of the forming end and the take-up end of the spiral protective sleeve;
the bracket is also fixed with a linear guide rail, a movable pulley bearing sliding support is arranged on the linear guide rail, a movable pulley is arranged on the movable pulley bearing sliding support, and the movable pulley can slide along the axial direction of the track of the linear guide rail along with the movable pulley bearing sliding support and can freely rotate along a wheel core;
the movable pulley bearing sliding support is also fixed with a balancing weight.
According to the technical scheme, a hanging rod is arranged on the movable pulley bearing sliding support and connected with the movable pulley bearing sliding support, and the balancing weight is fixed on the hanging rod.
According to the technical scheme, the support is further fixed with a limit switch support, an upper limit switch and a lower limit switch are arranged on the limit switch support, and the two limit switches are connected with a control system and used for adjusting the speed of the wire receiving end.
According to the technical scheme, when the speed of the wire take-up end is higher than that of the forming end, the spiral protective sleeve is tightened, the movable pulley moves upwards, the upper limit switch is triggered, the upper limit switch transmits a signal to the control system, and the control system enables the spiral protective sleeve to be loosened, the movable pulley moves downwards and the upper limit switch resets by reducing the speed of the wire take-up end; when the speed of the wire winding end is lower than that of the forming end, the spiral protective sleeve is loosened, the movable pulley moves downwards and triggers the lower limit switch, the lower limit switch transmits a signal to the control system, and the control system enables the spiral protective sleeve to be tightened, the movable pulley moves upwards and the lower limit switch resets by improving the speed of the wire winding end.
The invention has the following beneficial effects: the scalability of the spiral protective sleeve structure controls the prestretching amount of the spiral protective sleeve by adjusting the quality of the balancing weight in the forming process, so that the sensing bare fiber in the spiral protective sleeve forms an extra length after being off-line and controls the size of the extra length.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic drawing of a helical sheath according to an embodiment of the present invention;
FIG. 2 is a schematic free state diagram of a spiral sheath according to an embodiment of the present invention;
FIG. 3 is a first schematic view of an excess fiber length processing apparatus according to an embodiment of the present invention;
FIG. 4 is a second schematic view of an excess fiber length processing apparatus according to an embodiment of the present invention;
FIG. 5 is a cross-sectional view of an array grating thermometry sensing optical cable according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In order to eliminate the influence of stress on the wavelength of the array grating, the array grating optical fiber is packaged in a dry-type non-filling belt-type spiral protective sleeve (hereinafter referred to as a spiral tube) in a bare fiber form, and the principle and the control method for forming the excess length of the optical fiber in the process are described in detail in the following.
As shown in fig. 1, when the spiral protecting pipe is formed, the array grating optical fiber penetrates into the pipe, a group of movable pulley balancing weights with mass M is arranged between the forming end and the receiving end of the spiral protecting pipe, at the moment, the spiral protecting pipe is in a stretching state under the action of gravity of the balancing weights, the pitch of the spiral protecting pipe is stretched and is recorded as P1, at the moment, two mark points are taken at the stretching section of the spiral protecting pipe and are recorded as a and B, and then, the length of the mark section of the spiral protecting pipe in the state is recorded as LABAnd the length of the array grating fiber is marked as FAB。
L is because the penetration of the array grating optical fiber is synchronously performed with the molding of the spiral protective sleeveAB＝FAB。
After the sheathing tube is finished and off-line, as shown in fig. 2, the spiral sheathing tube 1 is in a freely unfolded state without being affected by the counterweight, and the pitch becomes small and is marked as P2, i.e., P2<P1, in this state, the mark points of the spiral sheath are marked as a and b, and the length is marked as LabAnd the length of the array grating fiber inside is marked as Fab。
Due to P2<P1, therefore, LAB>Lab。
The array grating optical fiber is positioned in the spiral sheath tube and is not influenced by external force, and at the moment, FAB＝Fab。
From the above length relationships, Fab＝FAB＝LAB>LabI.e. Fab>Lab. Therefore, the processing technology of the fiber grating protective sleeve can enable the optical fiber to be in the sleeve to form a positive surplus length.
The size of the extra length depends on the size difference of pitches P1 and P2 of the spiral protecting sleeve, obviously, the change size of the pitch is related to the mass M of the balancing weight, the larger M is, the larger the difference between P2 and P1 is, the larger the difference between the lengths of the array grating optical fiber and the spiral protecting sleeve is, namely, the larger the extra length is, and vice versa, and the method for controlling the extra length process is related to the invention.
The invention also provides an optical cable processing device which comprises a bracket, wherein two fixed pulleys are fixed on the bracket, one fixed pulley is used as a positioning guide wheel at the forming end of the spiral protective sleeve, and the other fixed pulley is used as a positioning guide wheel at the take-up end of the spiral protective sleeve; the optical cable processing device also comprises a control system for controlling the winding and unwinding speeds of the forming end and the take-up end of the spiral protective sleeve; the bracket is also fixed with a linear guide rail, a movable pulley bearing sliding support is arranged on the linear guide rail, a movable pulley is arranged on the movable pulley bearing sliding support, and the movable pulley can slide along the axial direction of the track of the linear guide rail along with the movable pulley bearing sliding support and can freely rotate along a wheel core; the movable pulley bearing sliding support is also fixed with a balancing weight.
As shown in fig. 3 and 4, the optical fiber extra-long processing apparatus according to the embodiment of the present invention includes a support 1, a fixed pulley 2, a fixed pulley bearing support 3, a movable pulley 4, a movable pulley bearing sliding support 5, a fixed pulley 6, a fixed pulley bearing support 7, a linear guide 8, a suspension rod 9, a weight 10, an upper limit switch 11, a lower limit switch 12, a limit switch support 13, and a control system (not shown in the figure).
In the optical fiber extra-long processing device, a fixed pulley 2 is fixed on a support 1 through a fixed pulley bearing support 3 and can rotate freely as a spiral protective sleeve, namely a spiral armor forming end positioning guide wheel.
The fixed pulley 6 is fixed on the support 1 through a fixed pulley bearing support 7 and can rotate freely as a spiral armor take-up end positioning guide wheel.
The movable pulley 4 is fixedly arranged on a movable pulley bearing sliding support 5, the movable pulley bearing sliding support 5 is arranged on a track of a linear guide rail 8, and the linear guide rail 8 is fixed on the bracket 1, so that the movable pulley 4 has 2 degrees of freedom, namely slides along the axial direction of the track of the linear guide rail 8 and freely rotates along a wheel core;
the suspender 9 is connected with a shaft rod of the sliding support 5 of the movable pulley bearing, and the weight 10 is arranged on the suspender 9, so that the weight of the weight 10 is transferred to the movable pulley 4 through the suspender 9, and the gravity borne by the movable pulley 4 can be freely controlled by changing the number of the weights 10, thereby controlling the gravity loaded on the spiral armor tube 14 and controlling the pretensioning pitch of the spiral armor tube 14;
a limit switch support 13 is fixed on the support 1, an upper limit switch 11 and a lower limit switch 12 are fixed on the limit switch support 13, and the function of the limit switch support is to adjust the speed of a wire receiving end, when the speed of the wire receiving end is different from that of a forming end, a spiral armored pipe 14 can be continuously tightened or loosened to drive the movable pulley 4 and a component thereof to move up and down, the pre-tensioning pitch of the spiral armored pipe 14 can fluctuate along with the up-and-down movement of the movable pulley 4, the larger the speed difference between the wire receiving end and the forming end is, the more sudden the up-and-down movement amplitude of the movable pulley 4 and the component thereof is, the larger the fluctuation of the pre-tensioning pitch of the spiral armored pipe 14 is, the influence on the stability of the surplus length is larger, and the speed of the wire receiving end is. When the speed of the wire take-up end is higher than that of the forming end, the spiral armor tube 14 is tightened, the movable pulley 4 and the component thereof move upwards, the upper limit switch 11 is triggered, the upper limit switch 11 transmits a signal to the control system, the control system enables the spiral armor tube 14 to be loosened by reducing the speed of the wire take-up end, the movable pulley 4 and the component thereof move downwards, and the upper limit switch 11 is reset; when the speed of the wire take-up end is lower than that of the forming end, the spiral armor tube 14 is loosened, the movable pulley 4 and components thereof move downwards, the lower limit switch 12 is triggered, the lower limit switch 12 transmits signals to the control system, the control system enables the spiral armor tube to be tightened up by improving the speed of the wire take-up end, the movable pulley 4 and components thereof move upwards, the lower limit switch 12 is reset, and the control system adjusts the speed matching of the wire take-up end and the forming end through the sensing of the limit switch, so that the stability of the control of the surplus length is achieved.
As shown in figure 5, the array grating temperature measurement sensing optical cable manufactured by the device and the process comprises a bare fiber 51 and a spiral protective sleeve 52, wherein the bare fiber is engraved with a fiber grating array and is packaged in the spiral protective sleeve.
Wherein the spiral protecting pipe is a dry-type non-filling spiral protecting pipe, a plurality of reinforcing ribs 53 are arranged in the spiral protecting pipe, and an outer protecting sleeve layer 54 is arranged outside the spiral protecting pipe.
In the optical cable packaging structure related to the present invention, the bare fiber 51 is an array grating fiber, and adopts a bare fiber form, so that the grating is not affected by stress.
In the optical cable packaging structure related by the invention, the dry-type non-filled spiral protective sleeve 52 is formed by adopting a stainless steel belt, so that the excellent corrosion resistance, high and low temperature linear stability and mechanical high strength of the stainless steel are utilized, the extra length of the optical fiber is conveniently controlled, and meanwhile, sufficient pressure resistance protection capability and good bending performance, particularly temperature conductivity, are provided for the optical fiber;
in the optical cable packaging structure related by the invention, the reinforcing ribs 53 adopt a parallel steel wire structure, the structure is fully applied in the field of communication optical cables, the tensile strength of the structure can provide good axial tensile strength for the optical cables, the influence on the wall thickness of the sheath is small, the good tensile strength is provided, and meanwhile, the thickness of the sheath can be reduced to the minimum.
In the optical cable packaging structure, the outer sheath layer 54 is made of HDPE, so that the array grating temperature measuring optical cable has good heat conductivity, weather resistance, protection level and mechanical property, and can adapt to various conventional engineering environments.
The invention relates to a surplus length control process, which is characterized in that the core key point of the process is that the scalability of a dry-type non-filling spiral pipe structure is utilized, the prestretching amount of the spiral pipe is controlled by adjusting the quality of a balancing weight in the forming process, so that sensing bare fibers in the spiral pipe form the surplus length after being off-line and the size of the surplus length is controlled, therefore, the control process of the spiral casing pipe is different from the spiral armor technology in the field of traditional communication optical cables from the aspects of purposes and implementation modes.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.
Claims (8)
1. A process for solving the problem of extra length of a fiber grating array temperature measurement optical cable is characterized by comprising the following steps:
while the spiral sheath tube is formed, the array grating optical fiber is penetrated into the spiral sheath tube;
a forming end and a take-up end of the spiral protective sleeve are respectively provided with a fixed pulley, and a group of movable pulley balancing weights with adjustable quality is arranged below the space between the two fixed pulleys;
under the action of gravity of the movable pulley balancing weight, the take-up speed of the forming end and the take-up end is controlled, so that the spiral protective sleeve is in a stretching state, and the extra length of the array grating optical fiber in the spiral protective sleeve is controlled.
2. The process for solving the problem of excess length of the fiber grating array temperature measuring optical cable according to claim 1, wherein the spiral protective sleeve is a dry non-filled stainless steel sleeve.
3. The process for solving the problem of excess length of the fiber grating array temperature measuring optical cable according to claim 1, wherein a plurality of reinforcing ribs are arranged in the spiral protecting sleeve.
4. An optical fiber grating array temperature measuring optical cable is characterized by comprising a bare fiber and a spiral protective sleeve, wherein an optical fiber grating array is engraved on the bare fiber and encapsulated in the spiral protective sleeve, and the optical fiber grating array temperature measuring optical cable is manufactured by the process for solving the problem of the extra length of the optical fiber grating array temperature measuring optical cable according to any one of claims 1 to 3.
5. An extra-long optical fiber processing device for realizing the process for solving the extra-long problem of the optical fiber grating array temperature measuring optical cable according to any one of claims 1 to 3, wherein the optical cable processing device comprises a bracket, two fixed pulleys are fixed on the bracket, one fixed pulley is used as a positioning guide wheel at the forming end of the spiral protecting sleeve, and the other fixed pulley is used as a positioning guide wheel at the take-up end of the spiral protecting sleeve;
the optical cable processing device also comprises a control system for controlling the winding and unwinding speeds of the forming end and the take-up end of the spiral protective sleeve;
the bracket is also fixed with a linear guide rail, a movable pulley bearing sliding support is arranged on the linear guide rail, a movable pulley is arranged on the movable pulley bearing sliding support, and the movable pulley can slide along the axial direction of the track of the linear guide rail along with the movable pulley bearing sliding support and can freely rotate along a wheel core;
the movable pulley bearing sliding support is also fixed with a balancing weight.
6. The apparatus according to claim 5, wherein the movable pulley bearing is provided with a suspension rod connected to the movable pulley bearing, and the weight member is fixed to the suspension rod.
7. The apparatus of claim 5, wherein the holder further comprises a limit switch holder having an upper limit switch and a lower limit switch, the two limit switches being connected to the control system for adjusting the speed of the take-up terminal.
8. The apparatus of claim 7, wherein when the speed of the winding end is higher than the speed of the forming end, the spiral sheath tube is tightened, the movable pulley moves upwards, and the upper limit switch is triggered, the upper limit switch transmits a signal to the control system, and the control system releases the spiral sheath tube by reducing the speed of the winding end, the movable pulley moves downwards, and the upper limit switch is reset; when the speed of the wire winding end is lower than that of the forming end, the spiral protective sleeve is loosened, the movable pulley moves downwards and triggers the lower limit switch, the lower limit switch transmits a signal to the control system, and the control system enables the spiral protective sleeve to be tightened, the movable pulley moves upwards and the lower limit switch resets by improving the speed of the wire winding end.
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| CN202010568464.8A CN111736281B (en) | 2020-06-19 | 2020-06-19 | Fiber grating array temperature measurement optical cable for solving problem of excess length and process |
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| CN202010568464.8A CN111736281B (en) | 2020-06-19 | 2020-06-19 | Fiber grating array temperature measurement optical cable for solving problem of excess length and process |
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Cited By (1)
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| 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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