CN110967150B - A sealed optical fiber ring assembly and its manufacturing and leak detection method - Google Patents
A sealed optical fiber ring assembly and its manufacturing and leak detection method Download PDFInfo
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- CN110967150B CN110967150B CN201911277858.1A CN201911277858A CN110967150B CN 110967150 B CN110967150 B CN 110967150B CN 201911277858 A CN201911277858 A CN 201911277858A CN 110967150 B CN110967150 B CN 110967150B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/20—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material
- G01M3/202—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material using mass spectrometer detection systems
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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
- G02B6/4401—Optical cables
- G02B6/4429—Means specially adapted for strengthening or protecting the cables
- G02B6/44384—Means specially adapted for strengthening or protecting the cables the means comprising water blocking or hydrophobic materials
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Light Guides In General And Applications Therefor (AREA)
Abstract
本发明涉及一种密封光纤环组件及其制作与检漏方法，旨在解决现有技术中存在的光纤环的密封性较低的问题。本发明提供了一种密封光纤环组件，将光纤环安装于环状盖板与光纤环骨架形成的环状密封腔内，光纤环的尾纤伸入保护套管内，并通过过纤通道引出，尾纤与保护套管之间、保护套管与环状盖板之间、保护套管与骨架内筒之间的间隙内均填充密封胶；由此实现光纤环的密封；本发明还提供了一种密封光纤环组件的制作方法以及一种密封光纤环组件的检漏方法，有效提高光纤环的密封性，进而提高光纤陀螺的环境适应性和长期重复性。
The present invention relates to a sealed optical fiber ring assembly and a method for making and leaking the same, aiming to solve the problem of low sealing of optical fiber rings in the prior art. The present invention provides a sealed optical fiber ring assembly, wherein the optical fiber ring is installed in an annular sealed cavity formed by an annular cover plate and an optical fiber ring skeleton, the pigtail of the optical fiber ring extends into a protective sleeve and is led out through a fiber passage, and the gaps between the pigtail and the protective sleeve, between the protective sleeve and the annular cover plate, and between the protective sleeve and the inner tube of the skeleton are filled with sealant; thereby, the sealing of the optical fiber ring is achieved; the present invention also provides a method for making a sealed optical fiber ring assembly and a method for leaking the sealed optical fiber ring assembly, which effectively improve the sealing of the optical fiber ring, thereby improving the environmental adaptability and long-term repeatability of the optical fiber gyroscope.
Description
Technical Field
The invention relates to sealing of an optical fiber ring, in particular to a sealing optical fiber ring assembly and a manufacturing and leakage detecting method thereof.
Background
The fiber optic gyroscope has the advantages of impact resistance, high sensitivity, long service life, large dynamic range, short starting time and the like, and is widely applied to inertial navigation systems.
The high-precision fiber optic gyroscope is generally composed of a combination of a fiber optic ring module, a digital demodulation circuit, an ASE light source, a 1X 3 coupler and a PIN-FET component. The fiber optic ring module includes a fiber optic ring. The optical fiber ring is a core component of the optical fiber gyro and is used for sensing a Sagnac phase difference between two opposite propagation light waves caused by input angular velocity. The external environment air pressure change, water vapor and salt fog can influence the performance of the optical fiber ring, and further influence the precision, reliability and long-term stability of the optical fiber gyroscope.
Therefore, the sealing of the optical fiber ring is particularly important, the sealing performance of the traditional optical fiber ring mainly depends on the sealing performance of the optical fiber inertial measurement unit, and the optical fiber inertial measurement unit usually adopts a static sealing structure with O-shaped sealing rubber strips, but because the optical fiber inertial measurement unit has a complex structure, multiple external interfaces and large volume, and is difficult to achieve good air tightness, the optical fiber ring cannot be well sealed, and the environmental adaptability and long-term repeatability of the optical fiber gyroscope are further affected.
Disclosure of Invention
The invention aims to solve the problem of low tightness of an optical fiber ring in the prior art, and provides a sealed optical fiber ring assembly and a manufacturing and leakage detecting method thereof.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the invention relates to a sealed optical fiber ring assembly, which is characterized by comprising an optical fiber ring framework, an annular cover plate, a protective sleeve and an optical fiber ring;
the optical fiber ring framework comprises a framework inner cylinder, a framework outer cylinder and an annular bottom plate;
The framework inner cylinder and the framework outer cylinder are coaxially arranged, one end of the two is provided with an annular cover plate, and the other end is provided with an annular bottom plate; thereby forming an annular sealing cavity among the framework inner cylinder, the framework outer cylinder, the annular cover plate and the annular bottom plate;
a fiber passing channel which is used for communicating the annular sealing cavity with the outside is arranged on the wall of the framework inner cylinder;
the optical fiber ring is arranged in the annular sealing cavity, and a tail fiber of the optical fiber ring is sleeved with a protective sleeve and led out from the fiber passing channel;
and the gaps between the tail fibers and the protective sleeve, between the protective sleeve and the annular cover plate and between the protective sleeve and the framework inner cylinder are filled with sealant.
Further, the sealant comprises silicon rubber, light curing adhesive and epoxy adhesive;
the silicone rubber is filled at a side opening part of the fiber passing channel communicated with the annular sealing cavity;
The light-curing adhesive is filled in a gap between the tail fiber and the protective sleeve;
The epoxy glue is filled in the gaps between the protection sleeve, the annular cover plate and the framework inner cylinder and in two sections of arc gaps between the annular cover plate and the framework inner cylinder, and the two sections of arc gaps are distributed on two sides of the fiber passing channel.
Further, the optical fiber ring is adhered in the annular sealing cavity through epoxy glue.
Further, one end, close to the annular cover plate, of the framework inner cylinder is provided with an annular folded edge which is bent towards the center of the framework inner cylinder, and an annular notch matched with the inner side of the annular cover plate is arranged at the bent position of the framework inner cylinder;
The fiber passing channel is arranged on the annular folded edge;
at least three mounting holes are uniformly formed in the annular folded edge along the circumferential direction of the annular folded edge.
Further, laser welding is performed between the annular cover plate and the framework outer cylinder;
the gaps between the annular cover plate and the annular notch except the arc-shaped gaps are laser welding.
Further, the framework inner cylinder, the framework outer cylinder and the annular bottom plate are of an integrated structure.
Based on the sealed optical fiber ring assembly, the invention also provides a manufacturing method of the sealed optical fiber ring assembly, which is characterized by comprising the following steps:
Step 1), penetrating tail fibers of an optical fiber ring into a protective sleeve, and injecting light curing adhesive into the protective sleeve;
Step 2) bonding the optical fiber ring into an optical fiber ring framework through epoxy glue, and discharging tail fibers with protective sleeves from a fiber passing channel;
step 3) laser welding the outer side of the annular cover plate and the framework outer cylinder, laser welding the inner side of the annular cover plate and the annular notch, and reserving a section of arc-shaped gap at two sides of the fiber passing channel respectively;
Step 4) plugging a side opening part of the fiber-passing channel communicated with the annular sealing cavity by coating silicone rubber;
And 5) coating epoxy glue in gaps among the protection sleeve, the annular cover plate and the framework inner cylinder, and coating epoxy glue in two arc gaps between the inner side of the annular cover plate and the annular notch.
Based on the sealed optical fiber ring assembly and the manufacturing method thereof, the invention also provides a leak detection method of the sealed optical fiber ring assembly, which is characterized by being implemented according to the following steps:
Step 1), manufacturing the sealed optical fiber ring assembly by the manufacturing method of the sealed optical fiber ring assembly;
step 2), placing the manufactured sealed optical fiber ring assembly into a vacuum pressure box;
Step 3), vacuumizing a vacuum pressure box, and maintaining for 0.5-2 hours;
Step 4), filling high-pressure helium into the vacuum pressure box, and maintaining the pressure for 0.5-2 hours;
step 5), taking out the sealed optical fiber ring assembly, and standing the sealed optical fiber ring assembly in the air for 4-8 hours;
step 6), placing the sealed optical fiber ring assembly into a leakage detection box;
step 7), vacuumizing a leak detection box by adopting a helium mass spectrometer leak detector, and performing leak rate test;
if the leak rate is qualified, the sealed optical fiber ring assembly is qualified;
and if the leak rate is not qualified, re-sealing the sealed optical fiber ring assembly, and then repeating the steps 1) to 7) until the leak rate is qualified.
Further, after the vacuum pressure box is vacuumized in the step 3), the vacuum pressure box is kept for 1h;
the pressure retention time in the step 4) is 1h.
The beneficial effects of the invention are as follows:
1. The optical fiber ring is arranged in the annular sealing cavity formed by the annular cover plate and the optical fiber ring framework, the tail fiber of the optical fiber ring stretches into the protective sleeve and is led out through the fiber passing channel, and the gaps between the tail fiber and the protective sleeve, between the protective sleeve and the annular cover plate and between the protective sleeve and the framework inner cylinder are filled with sealant, so that the sealing of the optical fiber ring is realized, the sealing design of the optical fiber ring in the optical fiber ring module is realized, the performance of the optical fiber ring is prevented from being influenced by the change of external environment air pressure, water vapor, salt fog and the like, the sealing performance of the optical fiber ring is effectively improved, and the environmental adaptability and long-term repeatability of the optical fiber gyro are further improved.
2. The invention uses three kinds of sealing glue, the light-curing glue fills the protective sleeve, the silicon rubber is not easy to flow and is flexible, so that the protective sleeve is protected by the silicon rubber on one hand, the communication port between the fiber passing channel and the annular sealing cavity can be blocked, the easy-flowing epoxy glue is prevented from flowing into the annular sealing cavity to influence the performance of the optical fiber ring, and the epoxy glue is good in adhesiveness, and other gaps are finally bonded and sealed by the epoxy glue, so that the tightness of the optical fiber ring module can be effectively improved.
3. In the invention, the optical fiber ring is adhered in the annular sealing cavity through the epoxy glue, so that the optical fiber ring is reliably fixed in the sealing cavity.
4. The annular folded edge which is bent towards the center is arranged at one end of the framework inner cylinder, the fiber passing channel is arranged on the annular folded edge, on one hand, the strength of the framework inner cylinder can be increased by the annular folded edge, on the other hand, the fiber passing channel is arranged on the annular folded edge, so that a tail fiber with a protective sleeve in the fiber passing channel is more stable, and on the other hand, the annular folded edge is provided with a mounting hole, so that the whole optical fiber ring assembly is more convenient to connect with an external platform body.
5. The annular cover plate and the optical fiber ring skeleton are welded by laser except for the two arc-shaped gaps at the two sides of the fiber passing channel, so that the annular cover plate and the optical fiber ring skeleton are connected and sealed more reliably by the laser welding, and the two arc-shaped gaps are reserved during welding, thereby avoiding the damage of laser to the optical fiber.
6. The invention adopts helium mass spectrum backpressure leak detection method to carry out leak detection test on the independently arranged sealed optical fiber ring component, and the sealed optical fiber ring component pressed by helium is placed into a leak detection box to be vacuumized and to carry out leak rate test until the leak rate is qualified; the method is simple and easy to implement, and can improve the reliability of the sealed optical fiber ring assembly.
Drawings
FIG. 1 is a schematic view of a sealed fiber optic ring assembly according to the present embodiment;
FIG. 2 is a schematic view of a sealed fiber optic ring assembly without a fiber optic ring installed in this embodiment;
FIG. 3 is an enlarged view at A in FIG. 2;
FIG. 4 is a schematic view of the structure of the annular cover plate in the present embodiment;
FIG. 5 is a schematic view of the structure of an optical fiber ring in the present embodiment;
FIG. 6 is a schematic view of the structure of the protective sheath in this embodiment;
FIG. 7 is a schematic view of an assembly process of the hermetic optical fiber ring assembly in the present embodiment;
Fig. 8 is a flow chart of a leak detection method of a sealed fiber optic ring assembly in this embodiment.
In the figure, a 1-optical fiber ring framework, a 11-framework inner cylinder, a 12-framework outer cylinder, a 13-annular bottom plate, a 14-annular folded edge, a 141-annular notch, a 16-mounting hole, a 2-annular cover plate, a 3-protective sleeve, a 4-optical fiber ring, a 41-pigtail, a 5-annular sealing cavity, 51-epoxy glue and a 6-fiber passing channel.
Detailed Description
To further clarify the objects, advantages and features of the present invention, a sealed fiber ring assembly and leak detection method according to the present invention will be described in further detail with reference to the drawings and the accompanying examples. The advantages and features of the present invention will become more apparent from the following detailed description. It should be noted that the drawings are in a very simplified form and are not to scale precisely, but merely for the purpose of facilitating and clearly aiding in the description of the embodiments of the invention, and that the structures shown in the drawings are often part of actual structures.
The invention will be described in detail below with reference to the drawings and the detailed description.
Referring to fig. 1 to 6, a sealed optical fiber ring assembly of the present embodiment includes an optical fiber ring skeleton 1, an annular cover plate 2, a protective sleeve 3, and an optical fiber ring 4;
The optical fiber ring skeleton 1 comprises a skeleton inner cylinder 11, a skeleton outer cylinder 12 and an annular bottom plate 13, wherein the annular bottom plate 13 is arranged at one end of the skeleton inner cylinder 11 and one end of the skeleton outer cylinder 12 to form a U-shaped groove, and the skeleton inner cylinder 11, the skeleton outer cylinder 12 and the annular bottom plate 13 are of an integrated structure;
The other end of the framework inner cylinder 11 is provided with an annular folded edge 14 which is bent towards the center, an annular notch 141 which is matched with the inner side of the annular cover plate 2 is arranged at the bent position of the framework inner cylinder, the annular folded edge 14 is provided with a fiber passing channel 6, and three mounting holes 16 are uniformly arranged on the annular folded edge 14 along the circumferential direction of the annular folded edge and are used for being connected with an external platform body.
The inner side of the annular cover plate 2 and the annular notch 141 are welded by laser, two arc-shaped gaps at two sides of the fiber passing channel 6 are reserved at the same time, so that optical fibers are prevented from being damaged, the outer side of the annular cover plate 2 and the other end of the framework outer cylinder 12 are welded by laser, an annular sealing cavity 5 is formed between the annular cover plate 2 and the optical fiber ring framework 1, the fiber passing channel 6 enables the annular sealing cavity 5 to be communicated with the outside, the optical fiber ring 4 is adhered to the annular sealing cavity 5 through epoxy glue 51, a protective sleeve 3 is sleeved on a tail fiber 41 of the optical fiber ring 4 and led out from the fiber passing channel 6, optical fiber fixing glue is filled in a gap between the tail fiber 41 and the protective sleeve 3, silicone rubber is filled in a port part at one side, communicated with the annular sealing cavity 5, of the epoxy glue 51 is filled in a gap between the protective sleeve 3 and the annular cover plate 2 and the framework inner cylinder 11, and the arc-shaped gaps between the annular cover plate 2 and the framework inner cylinder 11 are filled. Thereby achieving a seal against the fiber ring.
As shown in fig. 7, the specific assembly steps of the sealed optical fiber ring assembly of this embodiment are:
step 1), enabling tail fibers 41 of an optical fiber ring 4 to pass through a protective sleeve 3, and injecting light-curing glue into the protective sleeve 3 for curing and sealing;
Step 2) bonding the optical fiber ring 4 on the annular bottom plate 13 of the optical fiber ring framework 1 through epoxy glue, and discharging the tail fiber 41 with the protective sleeve 3 from the fiber passing channel 6;
Step 3) covering the opening of the optical fiber ring skeleton 1 with an annular cover plate 2, and welding the outer side of the annular cover plate 2 and the skeleton outer cylinder 12 in a whole circle by laser, wherein the inner side of the annular cover plate 2 and the annular notch 141 are welded by laser except for arc gaps at two sides of the fiber passing channel 6;
step 4) coating silicon rubber in the fiber passing channel 6, and plugging a communication port between the fiber passing channel 6 and the annular sealing cavity 5 through the silicon rubber;
Step 5) epoxy glue is coated in the gaps between the protection sleeve 3 and the annular cover plate 2 and between the protection sleeve 3 and the framework inner cylinder 11, and epoxy glue is coated in the two arc gaps between the inner side of the annular cover plate 2 and the annular notch 141.
The leak detection method for the sealed optical fiber ring assembly adopts a helium mass spectrum backpressure leak detection method to leak the sealed structure of the optical fiber ring, as shown in fig. 8, and comprises the following specific steps:
The method comprises the steps of firstly placing the sealed optical fiber ring assembly into a vacuum pressure box, vacuumizing the vacuum pressure box, keeping the vacuum pressure box for 1h, then filling high-pressure helium into the vacuum pressure box under the vacuum condition, if leakage holes exist at welding seams or glue injection and gluing positions of an optical fiber ring framework and a cover plate, enabling the helium to enter an annular sealing cavity formed by the optical fiber ring framework and the annular cover plate through the leakage holes, taking out the sealed optical fiber ring assembly from the vacuum pressure box after pressure maintaining for 1h, standing in air for 5-6 h, completely dispersing helium on the outer surface of the sealed optical fiber ring assembly until the helium does not exist on the outer surface, placing the sealed optical fiber ring assembly pressed with the helium into a leakage detection box, vacuumizing the leakage detection box by adopting a helium mass spectrometer, and testing leakage rate.
If the leak rate does not meet the design requirement, the laser welding seam, the glue injection and gluing positions are checked again, the glue injection and gluing sealing are carried out again on the leak hole or the position where the leak hole possibly exists, and the repeated leakage detection method is carried out after the sealing until the leak rate meets the design requirement.
Claims (8)
1. The sealing optical fiber ring assembly is characterized by comprising an optical fiber ring framework (1), an annular cover plate (2), a protective sleeve (3) and an optical fiber ring (4);
The optical fiber ring framework (1) comprises an inner framework cylinder (11), an outer framework cylinder (12) and an annular bottom plate (13);
The framework inner cylinder (11) and the framework outer cylinder (12) are coaxially arranged, one end of each of the framework inner cylinder (11) and the framework outer cylinder is provided with an annular cover plate (2), and the other end of each of the framework inner cylinder and the framework outer cylinder is provided with an annular bottom plate (13), so that an annular sealing cavity (5) is formed among the framework inner cylinder (11), the framework outer cylinder (12), the annular cover plate (2) and the annular bottom plate (13);
a fiber passing channel (6) which is used for communicating the annular sealing cavity (5) with the outside is arranged on the wall of the framework inner cylinder (11);
The optical fiber ring (4) is arranged in the annular sealing cavity (5), and a tail fiber (41) of the optical fiber ring (4) is sleeved with the protective sleeve (3) and led out from the fiber passing channel (6);
The gaps between the tail fibers (41) and the protective sleeve (3), between the protective sleeve (3) and the annular cover plate (2) and between the protective sleeve (3) and the framework inner cylinder (11) are filled with sealant;
The sealant comprises silicon rubber, light curing adhesive and epoxy adhesive (51);
The silicon rubber is filled at the opening part of one side of the fiber passing channel (6) communicated with the annular sealing cavity (5);
The light-curing adhesive is filled in a gap between the tail fiber (41) and the protective sleeve (3);
the epoxy glue (51) is filled in the gap between the protection sleeve (3) and the annular cover plate (2) and the framework inner cylinder (11), and is filled in two sections of arc-shaped gaps between the annular cover plate (2) and the framework inner cylinder (11), and the two sections of arc-shaped gaps are distributed on two sides of the fiber passing channel (6).
2. A sealed fiber optic ring assembly as claimed in claim 1, wherein,
The optical fiber ring (4) is adhered in the annular sealing cavity (5) through epoxy glue (51).
3. A sealed fiber optic ring assembly according to claim 1 or 2, wherein,
An annular folded edge (14) which is bent towards the center of the annular cover plate (2) is arranged at one end, close to the annular cover plate (2), of the framework inner cylinder (11), and an annular notch (141) which is matched with the inner side of the annular cover plate (2) is arranged at the bent position of the annular folded edge;
the fiber passing channel (6) is arranged on the annular folded edge (14);
at least three mounting holes (16) are uniformly formed in the annular folded edge (14) along the circumferential direction of the annular folded edge.
4. A sealed fiber optic ring assembly as claimed in claim 3 wherein,
The annular cover plate (2) and the framework outer cylinder (12) are welded by laser;
the gaps between the annular cover plate (2) and the annular notch (141) except the arc-shaped gaps are laser welding.
5. The sealed optical fiber ring assembly according to claim 4, wherein the skeleton inner tube (11), the skeleton outer tube (12) and the annular bottom plate (13) are integrally formed.
6. A method of making a sealed fiber optic ring assembly according to any one of claims 1-5, comprising the steps of:
step 1), penetrating tail fibers (41) of an optical fiber ring (4) into a protective sleeve (3), and injecting light-curing adhesive into the protective sleeve (3);
Step 2) bonding the optical fiber ring (4) into the optical fiber ring framework (1) through epoxy glue, and discharging the tail fiber (41) with the protective sleeve (3) from the fiber passing channel (6);
Step 3) the outer side of the annular cover plate (2) is welded with the framework outer cylinder (12) by laser, the inner side of the annular cover plate (2) is welded with the annular notch (141) by laser, and a section of arc-shaped gap is reserved at two sides of the fiber passing channel (6) respectively;
step 4) a side opening part communicated with the annular sealing cavity (5) through the fiber passing channel (6) is blocked by coating silicone rubber;
And 5) coating epoxy glue in gaps between the protection sleeve (3) and the annular cover plate (2) and between the protection sleeve and the framework inner cylinder (11), and coating epoxy glue in two arc gaps between the inner side of the annular cover plate (2) and the annular notch (141).
7. A method of leak detection of a sealed fiber optic ring assembly according to any one of claims 1-5, comprising the steps of:
step 1) manufacturing a sealed fiber optic ring assembly according to any one of claims 1-5 by the method of claim 6;
step 2), placing the manufactured sealed optical fiber ring assembly into a vacuum pressure box;
Step 3), vacuumizing a vacuum pressure box, and maintaining for 0.5-2 hours;
Step 4), filling high-pressure helium into the vacuum pressure box, and maintaining the pressure for 0.5-2 hours;
step 5), taking out the sealed optical fiber ring assembly, and standing the sealed optical fiber ring assembly in the air for 4-8 hours;
step 6), placing the sealed optical fiber ring assembly into a leakage detection box;
step 7), vacuumizing a leak detection box by adopting a helium mass spectrometer leak detector, and performing leak rate test;
if the leak rate is qualified, the sealed optical fiber ring assembly is qualified;
and if the leak rate is not qualified, re-sealing the sealed optical fiber ring assembly, and then repeating the steps 1) to 7) until the leak rate is qualified.
8. A method of leak detection of a sealed fiber optic ring assembly as defined in claim 7,
After the vacuum pressure box is vacuumized in the step 3), maintaining for 1h;
the pressure retention time in the step 4) is 1h.
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