Laser transmission connecting piece and optical fiber detection assembly comprising same

Abstract

The utility model provides a laser transmission connecting piece and an optical fiber detection assembly comprising the same, and the laser transmission connecting piece comprises an optical fiber which comprises a peeling coating segment and a coating segment; the outer side of the joint of the stripping coating section and the coating section is coated with a first loose tube; the outer side of the section with the coating is coated with a second loose tube, and a set interval is formed between the second loose tube and the first loose tube; the high-temperature glue coats the exteriors of the first loose tube and part of the second loose tube and the exteriors of the first subsections of the stripping coating sections; a through hole is formed in the ceramic joint, the second subsection of the stripping coating section is inserted into the through hole, and the ceramic joint is in contact with the high-temperature glue; and the metal sleeve is arranged outside the ceramic joint and the high-temperature glue. Through the above design, the stability of the laser transmission connecting piece is improved, it can be ensured that laser is transmitted to the photoelectric detector, and it is ensured that a photoelectric conversion result is obtained.

Description

Technical Field

[0001] The present application relates to the technical field of optical fiber measurement electronic devices, and in particular to a laser transmission connector and an optical fiber detection assembly including the same. Background Art

[0002] In a fiber optic gyroscope system, a photodetector is needed to detect the intensity of the laser light returning from the gyroscope. This intensity is converted into an electrical intensity signal and transmitted to a system analysis device. Ultimately, the gyroscope angle can be adjusted at any time to ensure precise guidance. During this process, the stability of the laser transmission component used to transmit the laser light to the photodetector is extremely important.

[0003] In the existing laser transmission assembly, one end of the optical fiber is stripped of its coating and connected to a ceramic joint. The outer side of the optical fiber that has not been stripped of its coating is wrapped with a loose tube. After the outer side of the loose tube is connected to the ceramic joint, a metal sleeve is sleeved on the outer side. High-temperature glue is used to fix the outer wall of the loose tube to the inner wall of the metal sleeve. The outer end of the ceramic joint is used to connect to the photodetector, and the outer end of the loose tube is used to connect the pigtail, which is used to receive the laser returned from the gyroscope. The laser transmission assembly in the prior art has the following defects: in harsh environments, affected by temperature changes, the high-temperature glue and the loose tube may be deformed, and the stress between the ceramic joint and the metal sleeve changes. When the stress change is reflected in the optical fiber, it may cause the optical fiber to be dislocated and broken, thereby making it impossible to achieve laser transmission. This affects the laser and makes it impossible to transmit to the photodetector, and ultimately, it is impossible to obtain a photoelectric conversion result. Summary of the Invention

[0004] The technical problem to be solved by this application is that the laser transmission component connected to the photodetector in the fiber optic gyroscope in the prior art is prone to light dislocation and breakage, which affects the laser transmission, and thus provides a laser transmission connector and a fiber optic detection component including the same.

[0005] In a first aspect, the technical solution of the present application provides a laser transmission connector, comprising:

[0006] An optical fiber including a stripped coating section and a coated section;

[0007] a first loose tube covering the outer side of the junction of the stripping coating section and the coated section;

[0008] a second loose tube, covering the outside of the coated section and having a set interval between the second loose tube and the first loose tube;

[0009] High temperature adhesive, covering the outside of the first loose tube and part of the second loose tube, and the outside of the first segment of the peeling coating segment;

[0010] A ceramic joint is provided with a through hole inside, and the through hole is for inserting a second segment of the stripping coating section, and the ceramic joint is in contact with the high-temperature adhesive;

[0011] A metal sleeve is arranged outside the ceramic joint and the high-temperature adhesive.

[0012] In some embodiments of the laser transmission connector, an internal thread is formed on the inner wall of the metal sleeve.

[0013] In some embodiments of the laser transmission connector, at least one groove is formed on the inner wall of the metal sleeve, and the groove is formed along the axial direction of the metal sleeve.

[0014] In some embodiments of the laser transmission connector, there are two grooves, and the two grooves are symmetrically arranged with respect to the axis.

[0015] In some embodiments of the laser transmission connector, a V-shaped groove is formed on one side of the ceramic joint close to the high-temperature adhesive, and the opening of the through hole is located at the bottom of the V-shaped groove.

[0016] In some embodiments of the laser transmission connector, it further includes:

[0017] A buffer part is arranged at the bottom of the V-shaped groove and covers the outside of the stripping coating section.

[0018] In some embodiments of the laser transmission connector, the length of the first loose tube is within a set range.

[0019] In some embodiments of the laser transmission connector, the length of the first loose tube is (2 ± 0.15) mm.

[0020] In some embodiments of the laser transmission connector, the second loose tube is connected with a pigtail assembly; the pigtail assembly includes a pigtail, a pigtail sleeve for fixing the pigtail, and a connector arranged at the end of the pigtail sleeve; after the pigtail sleeve is connected with the second loose tube, the pigtail is butt-jointed with the optical fiber, and the connector is used for receiving the laser to be measured.

[0021] In a second aspect, the technical solution of the present application provides an optical fiber detection assembly, including a photodetector and the laser transmission connector according to any one of the first aspect, and the ceramic joint of the laser transmission connector is connected to the input end of the photodetector.

[0022] The above technical solution provided by the present application, compared with the prior art, has at least the following effects:

[0023] The laser transmission connector provided by the present application and the optical fiber detection component including the same. The laser transmission connector includes: an optical fiber, including a stripped coating section and a coated section; a first loose tube is used to cover the outside of the junction of the stripped coating section and the coated section; a second loose tube is used to cover the outside of the coated section and has a set interval from the first loose tube; that is, in the prior art, the loose tube is divided into two sections, and one of the sections is used to make the junction of the stripped coating section and the coated section more stable. A high-temperature adhesive is coated on the outside of the first loose tube and part of the second loose tube, and the outside of the first segment of the stripped coating section; a ceramic joint is provided with a through hole inside, and the second segment of the stripped coating section is inserted into the through hole, and the ceramic joint is in contact with the high-temperature adhesive; a metal sleeve is arranged on the outside of the ceramic joint and the high-temperature adhesive. Through the above design of the present application, affected by temperature changes, the properties of the high-temperature adhesive change. When it reacts on the loose tube, since the loose tube is segmented, especially a protective first loose tube is provided at the connection position of the stripped coating and the non-stripped coating, and no stress is generated between the two loose tubes, greatly reducing the acting force on the connection position of the stripped coating and the non-stripped coating, and this position is the most likely to be misaligned and broken. Through this solution, it is well protected, improving the stability of the laser transmission connector and ensuring that the laser can be transmitted to the photodetector to obtain the photoelectric conversion result. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic structural diagram of the laser transmission connector according to an embodiment of the present application;

[0025] Figure 2 It is a schematic internal structure diagram of the metal sleeve according to an embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] The following further describes the specific embodiments of the present application with reference to the drawings.

[0027] It is easy to understand that according to the technical solution of the present application, under the condition of not changing the essence of the present application, there are various structural ways and implementation ways that can be mutually replaced by those of ordinary skill in the art. Therefore, the following specific embodiments and the drawings are only exemplary descriptions of the technical solution of the present application, and should not be regarded as all of the present application or as a limitation or restriction on the technical solution of the application.

[0028] The orientation terms such as up, down, left, right, front, back, front, back, top, bottom, etc. mentioned or possibly mentioned in this specification are defined relative to the structures shown in the respective drawings. They are relative concepts, and therefore may change accordingly according to their different positions and different usage states. Therefore, these or other orientation terms should not be construed as restrictive terms.

[0029] This embodiment provides a laser transmission connector, such as Figure 1 shown, which includes an optical fiber, a first loose tube 21, a second loose tube 22, a high-temperature adhesive 3, a ceramic joint 4, and a metal sleeve 5. Among them, the optical fiber includes a stripped coating section 11 and a coated section 12; the first loose tube is wrapped outside the junction of the stripped coating section 11 and the coated section 12; the second loose tube 22 is wrapped outside the coated section 12 and has a set interval from the first loose tube 11; the high-temperature adhesive 3 is wrapped outside the first loose tube 21 and part of the second loose tube 22, and outside the first segment of the stripped coating section 11; the ceramic joint 4 is provided with a through hole, and the second segment of the stripped coating section 11 is inserted into the through hole, and the ceramic joint 4 is in contact with the high-temperature adhesive 3; the metal sleeve 5 is arranged outside the ceramic joint 4 and the high-temperature adhesive 3.

[0030] In the above solution, a single-mode optical fiber is selected. The single-mode optical fiber is made by drawing a high-purity silica doped with boron and germanium into a core, and a layer of quartz glass about 125um is coated on the outer layer of the core. The stripped coating section 11 can be obtained by stripping the coating of the single-mode optical fiber. A fiber stripper can be used to strip the coating to ensure better bonding between the stripped coating section 11 and the ceramic joint 4. The coated section 12 is a normal single-mode optical fiber, which can protect the fiber core from damage while ensuring laser transmission. The first loose tube 21 and the second loose tube 22 are made of the same material as the existing loose tubes. The first loose tube 21 and the second loose tube 22 can protect the optical fiber, but due to their plastic nature, the shrinkage force generated by temperature is extremely large. Therefore, when the existing overall loose tube shrinks, it is easy to drive the optical fiber out of position or break. In this application, the first loose tube 21 and the second loose tube 22 are designed to be separated, reducing the stress on the optical fiber at the junction of the stripped coating section 11 and the coated section 12 caused by the scaling force of the loose tube due to temperature change, and avoiding dislocation or breakage. The high-temperature adhesive 3 can be 353ND adhesive, which is obtained by baking at a temperature of 110°C for a certain period of time to achieve high-strength brittle bonding. The ceramic joint 4 is a non-standard zirconia ceramic head. As the end of the laser transmission connector, it can be inserted into the photodetector by adjusting the angle and grinding of the end face, and can ensure low insertion loss and return loss.

[0031] The laser transmission connector provided in this embodiment is affected by temperature changes. When the high-temperature glue undergoes a change in properties and is reflected on the loose tube, since the loose tube is segmented, especially at the connection position between the stripped coating and the non-stripped coating, a protected first loose tube is provided. No stress will be generated between the two loose tubes, greatly reducing the acting force on the connection position between the stripped coating and the non-stripped coating. And this position is the most prone to dislocation and fracture, and it is well protected by this solution, improving the stability of the laser transmission connector, ensuring that the laser can be transmitted to the photodetector, and ensuring the photoelectric conversion result. By adopting this solution, the laser transmission connector can continuously ensure the normal transmission of the laser in a harsh environment (-55°C to +85°C), transmit the 1310nm - 1550nm laser to the photodetector, thereby improving the product reliability.

[0032] In the above solution, the length of the first loose tube is within a set range, so that it can not only protect the stability of the connection of the two parts of the optical fiber, but also will not bring great difficulty to the processing. Preferably, the length of the first loose tube is (2 ± 0.15) mm.

[0033] Preferably, for the laser transmission connector in the above solution, as Figure 2 shown, an internal thread 51 is formed on the inner wall of the metal sleeve 5. The metal sleeve 5 is a sleeve made of stainless steel. An internal thread 51 is provided inside it, which can generate a greater bonding force with the high-temperature glue 3 and achieve enhanced positioning of the high-temperature glue 3. Further preferably, at least one groove 52 is opened on the inner wall of the metal sleeve 5, and the groove 52 is opened along the axial direction of the metal sleeve 5. By providing the groove 52, the deformation and the stress generated by the deformation can be absorbed when the high-temperature glue 3 deforms due to temperature change, avoiding the deformation force being transmitted to the optical fiber through the loose tube and further protecting the optical fiber. When specifically implemented, it is preferred that the groove 52 includes two, and the two grooves 52 are symmetrically arranged with respect to the central axis, so that the processing difficulty of the metal sleeve 5 can be simplified. Therefore, the structure of the metal sleeve 5 has the following multiple functions: riveting the ceramic joint 4 into its interior, and at the same time using the internal thread design to prevent the loose tube from being pulled off and separated from the metal sleeve 5 under the later environmental stress, and further releasing part of the environmental stress by opening slots inside the metal sleeve 5.

[0034] In some technical solutions, as Figure 1 shown, a V-shaped groove 6 is formed on one side of the ceramic joint 4 close to the high-temperature glue, and the opening of the through hole is located at the bottom of the V-shaped groove 6. In this solution, the tail end of the ceramic joint 4 is designed with a V-shaped opening, which can more conveniently realize the guiding function of physically passing the optical fiber through the through hole of the ceramic joint 4.

[0035] Preferably, the laser transmission connector further includes a buffer portion 7 disposed at the bottom of the V-shaped groove 6 and covering the outside of the stripped coating section 11. The buffer portion 7 is preferably an ultraviolet glue. After the coating is stripped, the stripped coating section 11 loses the protection of the coating for the optical fiber to be stripped, and it is difficult to directly insert it into the through hole at the bottom of the V-shaped groove 6 due to the influence of the loose tube. Therefore, in this solution, a glue application process can be added at the position where the stripped coating section 11 contacts the through hole after the coating is stripped, and the optical fiber is coated with ultraviolet glue to form the buffer portion 7 on the stripped optical fiber. The buffer portion 7 plays a protective role for the optical fiber.

[0036] Further, in the laser transmission connector, the second loose tube 22 is connected to a pigtail assembly; the pigtail assembly includes a pigtail, a pigtail sleeve 8 for fixing the pigtail, and a connector 10 disposed at the end of the pigtail sleeve; after the pigtail sleeve 8 is connected to the second loose tube, the pigtail is docked with the optical fiber, and the connector 10 is used to receive the laser to be measured. The pigtail sleeve 8 includes a rubber sheath for connecting and buffering to ensure the use of the optical fiber. The connector 10 is used to dock with the component that returns the laser of the gyroscope to ensure the complete transmission of the input laser. As shown in the figure, a plastic housing 9 can also be provided between the pigtail sleeve 8 and the connector 10 to fix the connector 10 and transmit the laser introduced by the connector 10. The plastic housing 9 is usually connected by an adapter flange.

[0037] The embodiment of the present application also provides an optical fiber detection component, including a photodetector and the laser transmission connector according to any one of the above embodiments, and the ceramic connector of the laser transmission connector is connected to the input end of the photodetector. The optical fiber detection component can reduce the stress generated by the product in a harsh environment and ensure the reliability of the product. It can be used in various aspects of optical fiber transmission and monitoring, such as fiber to the home, fiber optic gyroscopes, radar and other fields, and has a wide range of applications.

[0038] According to needs, the above technical solutions can be combined to achieve the best technical effect.

[0039] The above are only the principles and preferred embodiments of the present application. It should be noted that for those of ordinary skill in the art, based on the principles of the present application, several other variations can also be made, which should also be regarded as the protection scope of the present application.

Claims

1. A laser transmission connector, characterized in that, Comprising: An optical fiber, including a stripped coating section and a coated section; A first loose tube, covering the outside of the joint between the stripped coating section and the coated section; A second loose tube, covering the outside of the coated section and having a set interval from the first loose tube; A high-temperature adhesive, covering the outside of the first loose tube and part of the second loose tube, and the outside of the first segment of the stripped coating section; A ceramic joint, with a through hole formed therein, the through hole for inserting the second segment of the stripped coating section, and the ceramic joint being in contact with the high-temperature adhesive; A metal sleeve, disposed outside the ceramic joint and the high-temperature adhesive.

2. The laser transmission connector according to claim 1, wherein: Internal threads are formed on the inner wall of the metal sleeve.

3. The laser transmission connector according to claim 2, wherein: At least one groove is formed on the inner wall of the metal sleeve, and the groove is formed along the axial direction of the metal sleeve.

4. The laser transmission connector according to claim 3, wherein: There are two grooves, and the two grooves are symmetrically arranged with respect to the axis.

5. The laser transmission connector according to any one of claims 1-4, wherein: A V-shaped groove is formed on the side of the ceramic joint close to the high-temperature adhesive, and the opening of the through hole is located at the bottom of the V-shaped groove.

6. The laser transmission connection member according to claim 5, wherein, Further comprising: A buffer portion, disposed at the bottom of the V-shaped groove and covering the outside of the stripped coating section.

7. The laser transmission connector according to any one of claims 1-4, wherein: The length of the first loose tube is within a set range.

8. The laser transmission connector according to claim 7, wherein: The length of the first loose tube is (2±0.15)mm.

9. The laser transmission connector according to any one of claims 1-4, wherein: The second loose tube is connected to a pigtail fiber assembly; the pigtail fiber assembly includes a pigtail fiber, a pigtail fiber sleeve for fixing the pigtail fiber, and a connector disposed at the end of the pigtail fiber sleeve; after the pigtail fiber sleeve is connected to the second loose tube, the pigtail fiber is butt-jointed with the optical fiber, and the connector is used to receive the laser to be measured.

10. An optical fiber detection component, characterized in that, Comprising a photodetector and the laser transmission connector according to any one of claims 1-9, and the ceramic joint of the laser transmission connector is connected to the input end of the photodetector.

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