CN115857101A - Leading-out interface protection process of fiber grating sensor - Google Patents
Leading-out interface protection process of fiber grating sensor Download PDFInfo
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- CN115857101A CN115857101A CN202211557478.5A CN202211557478A CN115857101A CN 115857101 A CN115857101 A CN 115857101A CN 202211557478 A CN202211557478 A CN 202211557478A CN 115857101 A CN115857101 A CN 115857101A
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Abstract
The invention discloses a leading-out interface protection process of a fiber grating sensor, belonging to the field of resin matrix composite materials and products, comprising the following steps: the end part of the optical fiber is welded with the optical fiber ceramic ferrule with the spring buckle; step two: locking the optical fiber connector and the two-way connector, and locking the two-way connector by penetrating through an aluminum clamp; sealing the optical fiber connector, the two-way connector and the aluminum fixture by using glue; the whole optical fiber is embedded into the honeycomb panel structure, and a polyimide sleeve is used for protecting the bending part; laying carbon fiber prepreg on the upper layer and the lower layer of the honeycomb plate, and fixing the optical fiber on the carbon fiber prepreg; placing a hollow aluminum block outside the two-way connector, and plugging the hollow aluminum block by using a thermosetting butyl adhesive tape; the vacuum belt pressing technology is adopted to make the uncured composite material structure product compact under the action of pressure; and (4) putting the product into a high-temperature oven for high-temperature curing.
Description
Technical Field
The invention belongs to the field of resin-based composite materials and products, and particularly relates to a process for protecting an outgoing interface of a fiber grating sensor.
Background
The composite material has the advantages of high specific strength, large specific rigidity, good fatigue resistance, good designability and the like, and is widely applied to modern aircraft structures to improve the structural performance. Advanced composite materials are applied to aerospace vehicles in the united states, and the application range of the composite materials on the aerospace vehicles is from the initial small structural components with simple structure and small stress (such as aircraft leading edges, air inlet covers, spoilers, nose fairings and the like) to integrated structural components with complex structure and large bearing ratio (such as rudders, elevators, flaperons, horizontal stabilizers, fuselages and the like). Currently, as the technology for preparing and using composite materials is mature, the composite materials are more and more commonly applied to large aircraft, and gradually replace traditional metal materials to become novel aviation materials.
Compared with a continuous medium material, the special structural form of the honeycomb structure gives the honeycomb structure more excellent mechanical properties. Under the same geometric dimension, in the aspect of bearing characteristics, the traditional continuous material is higher than a honeycomb structure, and for the honeycomb structure, the in-plane bearing capacity is larger than the out-of-plane bearing capacity; however, in terms of material density, conventional continuous materials are much larger than honeycomb structures; in the aspect of bearing impact load, the composite material is easy to generate impact damage, and the honeycomb structure has good energy absorption performance and high impact load toughness. Therefore, for the reasons, researchers combine the two materials to form a novel material, namely a composite material honeycomb sandwich structure, which not only inherits the characteristic of high bearing capacity of the composite material, but also has good impact load resistance, and saves the manufacturing cost.
At present, the load bearing capacity of the composite material honeycomb sandwich structure is judged by detecting the external strain condition and the macroscopic size deformation condition of the composite material honeycomb sandwich structure, a detection mode that real-time strain is obtained when each part inside the composite material honeycomb sandwich structure bears impact is not considered, and a mode that some sensors are embedded into the structure is also provided, but the leading-out part of a sensing wire is not processed with portability and reliability.
Disclosure of Invention
The invention provides a leading-out interface protection process of a fiber grating sensor, which can integrate the fiber grating sensor in a composite material honeycomb sandwich structure, solves the problem that optical fibers need to be led out when the optical fibers are embedded in the composite material honeycomb structure, and improves the integral portability and engineering reliability of the composite material honeycomb sandwich structure integrated with the fiber grating sensor.
In order to achieve the purpose, the invention adopts the following technical scheme:
a leading-out interface protection process of a fiber grating sensor comprises the following steps:
the method comprises the following steps: welding the end part of the optical fiber with the optical fiber ceramic ferrule with the spring buckle to obtain an optical fiber connector;
step two: locking an optical fiber connector with a two-way connector which is internally provided with a spring buckle and externally provided with threads by using the spring buckle, and enabling the two-way connector to pass through an aluminum clamp internally provided with the threads and be locked by using the threads;
step three: sealing the optical fiber connector, the two-way connector and the aluminum fixture;
step four: the whole optical fiber is embedded into the honeycomb panel structure, and the bent part is protected by a protective sleeve;
step five: laying carbon fiber prepreg on the upper layer and the lower layer of the honeycomb plate, and fixing the optical fiber on the carbon fiber prepreg;
step six: placing a hollow aluminum block outside the two-way connector, and plugging the hollow aluminum block by using a thermosetting butyl adhesive tape;
step seven: compacting the honeycomb plate paved with the carbon fiber prepreg in the fifth step under the action of pressure by adopting a vacuum belt pressing molding technology; and (4) putting the product into a high-temperature oven for high-temperature curing.
In the above steps, the first step specifically includes: scraping a part of coating layer of the optical fiber, penetrating the optical fiber into a micropore of the optical fiber ceramic ferrule, vertically cutting the part of the optical fiber exposed out of the ceramic ferrule by using a cutting knife, fusing the optical fiber and the optical fiber ceramic ferrule, and injecting resin glue into the optical fiber ceramic ferrule along the optical fiber inserting end to fixedly connect the optical fiber ceramic ferrule and the optical fiber ceramic ferrule to form an optical fiber joint;
the second step specifically comprises: aligning and inserting the optical fiber connector with the buckling position of an internal spring of the double-pass connector; the aluminum fixture is provided with three through holes in total, the middle through hole is provided with threads and is used for being matched with the two-way connector, and the two small through holes beside the aluminum fixture can guide gas or molten glue in the composite material structure out of the structure so as to keep the pressure balance in the composite material structure; the upper surface and the lower surface of the aluminum clamp are subjected to frosting treatment and used for enhancing the adhesive force between the aluminum clamp and the carbon fiber prepreg, the aluminum clamp with threads inside is penetrated to the end of an optical fiber connector from the other end of the optical fiber, the two-way connector is fixed, the aluminum clamp is rotated, and the threads between the aluminum clamp and the two-way connector are locked;
the third step specifically comprises: after the optical fiber connector and the two-way connector are oppositely inserted and locked by the spring buckle, a certain gap is generated inside the two-way connector, filling epoxy resin glue into the ceramic ferrule along the position where the optical fiber is introduced into the ceramic ferrule; filling epoxy resin glue into the aluminum clamp along the position where the optical fiber connector is connected in series with the aluminum clamp; coating a layer of epoxy resin adhesive on the connecting end part of the bi-pass connector and the aluminum clamp, and placing the whole optical fiber after being sealed with the adhesive for 8 hours at normal temperature to wait for the epoxy resin adhesive to be cured;
the fourth step specifically comprises: cutting off partial material at the end part of the honeycomb plate for placing an aluminum clamp, and after the aluminum clamp is placed, penetrating the polyimide small sleeve into the optical fiber from the other end of the optical fiber and fixing the polyimide small sleeve at the bent part of the optical fiber;
the fifth step specifically comprises the following steps: cutting a fine line at the front end of the carbon fiber prepreg along the optical fiber embedding direction, guiding the optical fiber to the surface of the carbon fiber prepreg along the notch from the surface of the honeycomb plate along the notch after the carbon fiber prepreg and the honeycomb plate are aligned, and fixing the optical fiber on the surface of the carbon fiber prepreg;
the sixth step specifically comprises: after the carbon fiber prepreg is laid, placing an aluminum block with a through hole at a two-way connector outside the composite material, and inserting thermosetting butyl rubber into the aluminum block to ensure the sealing property of the two-way connector;
step seven specifically comprises the steps of adopting a vacuum belt pressing forming technology, putting an uncured product formed by hand pasting into a polyethylene bag, a polyvinyl alcohol bag and a rubber bag, removing air in the rubber bag, and applying pressure to compact the uncured composite material structural product under the action of pressure; and (4) putting the product into a high-temperature oven for high-temperature curing.
Has the beneficial effects that: the invention provides a process for protecting a leading-out interface of a fiber grating sensor, which can integrate the fiber grating sensor in a composite material honeycomb sandwich structure, can directly detect the strain condition in the material, solves the problem that the optical fiber needs to be led out when the optical fiber is embedded in the composite material honeycomb structure, and improves the integral portability and engineering reliability of the composite material honeycomb sandwich structure integrated with the fiber grating sensor.
Drawings
FIG. 1 is a schematic diagram of a honeycomb sandwich structure with optical fibers integrated in the composite material according to an embodiment of the present invention;
FIG. 2 is a sectional view of a composite material honeycomb sandwich structure according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of an end face of an optical fiber being routed out using a protective sleeve in an embodiment of the present invention;
FIG. 4 is a flow chart of the steps of an embodiment of the present invention;
in the figure: 1 is an aluminum clamp with threads; 2 is a two-way connector; 3 is an external aluminum block with a through hole; 4 is an optical fiber joint; 5 is an optical fiber; and 6, a honeycomb sandwich plate.
Detailed Description
The invention is described in detail below with reference to the following figures and specific examples:
as shown in fig. 2, a process for protecting an outgoing interface of a fiber grating sensor specifically includes the following steps:
the method comprises the following steps: the end part of the optical fiber is welded with the optical fiber ceramic ferrule, and the method comprises the following steps: scraping a part of coating layer of the optical fiber, penetrating the optical fiber into a micropore of the optical fiber ceramic ferrule, vertically cutting the part of the optical fiber exposed out of the ceramic ferrule by using a cutting knife, welding the optical fiber and the optical fiber ceramic ferrule, and injecting resin glue into the optical fiber ceramic ferrule along the optical fiber inserting end to fixedly connect the optical fiber ceramic ferrule and the optical fiber ceramic ferrule to form an optical fiber joint 4;
step two: with optical fiber splice 4 and inside have outside screwed bi-pass connector 2 of spring buckle, utilize spring buckle locking, pass inside screwed aluminium system anchor clamps 1 with bi-pass connector 2, utilize screw thread locking, specifically as follows: the optical fiber connector 4 is aligned with and inserted into the inner spring catch position of the double-pass connector 2. The aluminum fixture 1 has three through holes in total, the middle through hole is provided with threads and is used for being matched with the two-way connector 2, and the two small through holes beside the aluminum fixture can guide gas or molten glue in the composite material structure out of the structure, so that the pressure balance in the composite material structure is kept; the upper surface and the lower surface of the aluminum clamp 1 are subjected to frosting treatment, and the frosting treatment is used for enhancing the bonding force between the aluminum clamp 1 and the carbon fiber prepreg. And (3) threading the aluminum clamp 1 with threads inside to the end of the optical fiber joint from the other end of the optical fiber, fixing the two-way connector 2, rotating the aluminum clamp 1, and locking the threads between the aluminum clamp 1 and the two-way connector 2.
Step three: before embedding the composite material honeycomb sandwich structure, the optical fiber connector 4, the two-way connector 2 and the aluminum fixture 1 are subjected to glue sealing treatment, which comprises the following steps: after the optical fiber connector 4 and the two-way connector 2 are oppositely inserted and locked by the spring buckle, a certain gap is generated inside the optical fiber connector 4, and epoxy resin glue is filled inside the optical fiber connector 4 along the position where the optical fiber is introduced into the ceramic ferrule; the optical fiber connector 4 is connected in series with the aluminum clamp 1, and epoxy resin glue is filled in the aluminum clamp; and coating a layer of epoxy resin glue on the connecting end part of the two-way connector 2 and the aluminum clamp 1. And placing the whole optical fiber after being sealed for 8 hours at normal temperature to wait for the epoxy resin glue to be cured.
Step four: the whole optical fiber is embedded into the composite material honeycomb sandwich structure, and a polyimide sleeve is used for protecting a bending part, and the method specifically comprises the following steps: and cutting off partial materials at the end part of the honeycomb sandwich plate 6 for placing the aluminum clamp 1, and after the aluminum clamp 1 is placed, penetrating the polyimide small sleeve into the optical fiber from the other end of the optical fiber and fixing the polyimide small sleeve at the bent part of the optical fiber.
Step five: a thin line is cut at the front end of the carbon fiber prepreg along the optical fiber embedding direction, the optical fibers are guided to the surface of the carbon fiber prepreg from the surface of the honeycomb sandwich board 6 along the cut after the carbon fiber prepreg and the honeycomb sandwich board 6 are aligned, the polyimide sleeve is located at the cut of the carbon fiber prepreg, and the optical fibers 5 are fixed on the surface of the carbon fiber prepreg.
Step six: after the carbon fiber prepreg is laid, an aluminum block 3 with a through hole is placed at the double-pass connector 2 outside the composite material, and thermosetting butyl rubber is plugged into the aluminum block 3 to ensure the sealing performance of the double-pass connector 2;
step seven: loading the uncured product formed by hand pasting into polyethylene, polyvinyl alcohol and a rubber bag by adopting a vacuum belt pressing forming technology, removing air in the rubber bag, and applying pressure to compact the uncured composite material structural product under the action of pressure; and (4) putting the product into a high-temperature oven for high-temperature curing.
The foregoing is only a preferred embodiment of this invention and it should be noted that modifications can be made by those skilled in the art without departing from the principle of the invention and these modifications should also be considered as the protection scope of the invention.
Claims (9)
1. A leading-out interface protection process of a fiber grating sensor is characterized by comprising the following steps:
the method comprises the following steps: the end part of the optical fiber is welded with the optical fiber ceramic ferrule with the spring buckle to obtain an optical fiber joint;
step two: locking an optical fiber connector with a double-pass connector which is internally provided with a spring buckle and externally provided with threads by using the spring buckle, and enabling the double-pass connector to penetrate through an aluminum clamp with internally provided threads and be locked by using the threads;
step three: sealing the optical fiber connector, the two-way connector and the aluminum fixture;
step four: the whole optical fiber is embedded into the honeycomb panel structure, and the bent part is protected by a protective sleeve;
step five: laying carbon fiber prepreg on the upper layer and the lower layer of the honeycomb plate, and fixing the optical fiber on the carbon fiber prepreg;
step six: placing a hollow aluminum block outside the two-way connector, and plugging the hollow aluminum block by using a thermosetting butyl adhesive tape;
step seven: adopting a vacuum belt pressing forming technology, and compacting the honeycomb plate paved with the carbon fiber prepreg in the fifth step under the action of pressure; and (4) putting the product into a high-temperature oven for high-temperature curing.
2. The leading-out interface protection process of the fiber grating sensor according to claim 1, wherein the first step specifically comprises: and scraping part of the coating layer of the optical fiber, penetrating the optical fiber into the micropores of the optical fiber ceramic ferrule, vertically cutting the part of the optical fiber exposed out of the ceramic ferrule by using a cutting knife, welding the optical fiber and the optical fiber ceramic ferrule, and injecting resin glue into the optical fiber ceramic ferrule along the optical fiber insertion end to fixedly connect the optical fiber ceramic ferrule and the optical fiber ceramic ferrule to form an optical fiber connector.
3. The lead-out interface protection process of the fiber grating sensor according to claim 1, wherein the two-way connector is internally provided with a spring buckle and an external thread, the aluminum fixture has three through holes, the middle through hole is provided with a thread and used for being matched with the two-way connector, and the two small through holes beside the aluminum fixture are used for leading gas or molten glue inside the composite material structure out of the inside of the structure.
4. The extraction interface protection process of the fiber grating sensor according to claim 1 or 3, wherein the second step specifically comprises: aligning and inserting the optical fiber connector with the inner spring buckle position of the double-pass connector; and (3) penetrating the aluminum clamp with the threads inside to the end of the optical fiber connector from the other end of the optical fiber, fixing the double-pass connector and rotating the aluminum clamp, and locking the threads between the aluminum clamp and the double-pass connector.
5. The extraction interface protection process of the fiber grating sensor according to claim 1, wherein the third step specifically comprises: after the optical fiber connector and the two-way connector are oppositely inserted and locked by the spring buckle, a certain gap is generated inside the two-way connector, and epoxy resin glue is filled inside the ceramic ferrule along the position where the optical fiber is introduced into the ceramic ferrule; filling epoxy resin glue into the aluminum clamp along the position where the optical fiber connector is connected in series with the aluminum clamp; and coating a layer of epoxy resin glue on the connecting end part of the bi-pass connector and the aluminum fixture, and placing the whole optical fiber after being sealed with the glue at normal temperature for waiting for the epoxy resin glue to be cured.
6. The leading-out interface protection process of the fiber grating sensor according to claim 1, wherein the fourth step specifically comprises: and cutting off partial material at the end part of the honeycomb plate for placing an aluminum clamp, and after the aluminum clamp is placed, penetrating the protective sleeve into the optical fiber from the other end of the optical fiber and fixing the optical fiber at the bent part of the optical fiber.
7. The extraction interface protection process of the fiber grating sensor according to claim 1, wherein the step five specifically comprises: the front end of the carbon fiber prepreg is cut with a thin line along the optical fiber embedding direction, the optical fiber is guided to the surface of the carbon fiber prepreg along the cut from the surface of the honeycomb plate after the carbon fiber prepreg and the honeycomb plate are aligned, and the polyimide sleeve is located at the cut of the carbon fiber prepreg and fixes the optical fiber on the surface of the carbon fiber prepreg.
8. The leading-out interface protection process of the fiber grating sensor according to claim 1, wherein the sixth step specifically comprises: after the carbon fiber prepreg is laid, an aluminum block with a through hole is placed at a bi-pass connector outside the composite material, and thermosetting butyl rubber is plugged into the aluminum block to ensure the tightness of the bi-pass connector.
9. The extraction interface protection process of the fiber grating sensor according to claim 1, wherein the seventh step specifically comprises: loading the uncured product formed by hand pasting into polyethylene, polyvinyl alcohol and a rubber bag by adopting a vacuum belt pressing forming technology, removing air in the rubber bag, and applying pressure to compact the uncured composite material structural product under the action of pressure; and (4) putting the product into a high-temperature oven for high-temperature curing.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211557478.5A CN115857101A (en) | 2022-12-06 | 2022-12-06 | Leading-out interface protection process of fiber grating sensor |
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| CN202211557478.5A CN115857101A (en) | 2022-12-06 | 2022-12-06 | Leading-out interface protection process of fiber grating sensor |
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| CN115857101A true CN115857101A (en) | 2023-03-28 |
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