Selectable industrial filter fiber in transmission band

Abstract

This invention relates to the field of optoelectronic detection equipment, specifically an improved industrial optical fiber structure with adjustable transmission band and filtering function. To achieve the above objectives, the invention employs the following technical solution: it comprises an optical fiber head, a first optical fiber, a second optical fiber, a filtering component, and a third optical fiber; the first and second optical fibers are inserted into the optical fiber head from the left side to its left end face to form an optical path entrance; the second optical fiber continues to be inserted into the filtering component from the right; the third optical fiber is inserted into the filtering component from the right side and optically connected to the second optical fiber at the filter, completing the optical path transmission; by introducing a replaceable filter component into the optical fiber path, the optical fiber itself possesses filtering function, eliminating reliance on terminal equipment for band selection and significantly enhancing the flexibility of band selection; simultaneously, it achieves a glue-free, reusable connection method, improving maintenance efficiency and component reusability.

Description

Technical Field

[0001] This utility model relates to the field of optoelectronic detection equipment, and in particular to an industrial optical fiber structure with filtering function and adjustable transmission band, belonging to the technology of optical fiber component structure optimization and connection method improvement. Background Technology

[0002] With the widespread application of photoelectric detection technology, optical fiber has been widely used in industrial automation, precision measurement and other fields due to its advantages such as high transmission efficiency, small size and strong anti-interference ability. Although conventional industrial optical fiber structures can complete basic optical signal transmission, in certain specific applications, it is especially necessary to effectively screen and filter light in specific wavelength bands to enhance the system's anti-interference ability or achieve multi-band precision detection.

[0003] Existing conventional optical fibers do not have the function of filtering light. When it is necessary to detect light in a specific wavelength band, the processing can only be carried out on the light receiving device. The selection of wavelength bands by the light receiving device is often fixed and it is difficult to change it at any time according to the needs, which cannot meet the flexible and ever-changing application scenarios.

[0004] In existing technologies, to achieve the filtering function, filters are typically added to the receiving end or detection equipment. However, this approach has the following problems: the filter components are usually integrated inside the terminal equipment, lacking flexibility and unable to change the filter band according to different detection requirements; the filter device is difficult to integrate directly with the optical fiber, resulting in a complex system structure and difficult assembly; some optical fiber components are fixed by methods such as potting or impregnation, which is time-consuming and inconvenient for subsequent maintenance and disassembly, affecting production efficiency and equipment reusability.

[0005] Therefore, there is an urgent need for an industrial filter fiber that has filtering function, detachable structure, replaceable components, simple assembly, and can effectively control the optical path accuracy, so as to meet the comprehensive requirements of flexible band selection, miniaturization and rapid maintenance in actual use. Utility Model Content

[0006] The purpose of this invention is to address the shortcomings and deficiencies of existing technologies by providing a transmission band selectable industrial filter optical fiber. By introducing a replaceable filter functional component into the optical fiber path, the optical fiber itself possesses filtering capabilities, eliminating the need for terminal equipment to select bands and significantly enhancing the flexibility of band selection. At the same time, it achieves a glue-free connection method that can be disassembled and reassembled multiple times, improving maintenance efficiency and component reuse rate.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: it comprises an optical fiber head 1, a first optical fiber 2, a second optical fiber 3, a filter element 4, and a third optical fiber 5; the first optical fiber 2 and the second optical fiber 3 are inserted into the optical fiber head 1 from the left side to its left end face to form an optical path entrance; the second optical fiber 3 continues to be inserted into the filter element 4 to the right; the third optical fiber 5 is inserted into the filter element 4 from the right side and optically connected to the second optical fiber 3 at the filter, completing the optical path transmission; the filter element 4 includes a left locking cap 41. The system consists of a left connecting tube 42, a circumferential fixing tube 43, a left protective washer 44, a filter 45, a right protective washer 46, a right connecting tube 47, and a right locking cap 48. The left locking cap 41 is threaded onto the left end of the left connecting tube 42. The left connecting tube 42 and the right connecting tube 47 are threaded together. The circumferential fixing tube 43, the left protective washer 44, the filter 45, and the right protective washer 46 are sequentially arranged inside the left connecting tube 42 and screwed together. The right locking cap 8 is threaded onto the right end of the right connecting tube 47. When tightened, all components are pressed together, achieving the positioning and fixation of the filter 45. The second optical fiber 3 passes through the left locking cap 41 and connects to the filter 45 via the left connecting tube 42; the third optical fiber 5 passes through the right locking cap 48 and connects to the filter 5 via the right connecting tube 47. The left protective washer 44 and the right protective washer 46 are for protecting the filter 45 from damage. When the filter 45 is thick enough, the circumferential fixing tube 43, left protective washer 44, and right protective washer 46 are not required. The thicker the filter 45, the less stress it will experience when the left connecting tube 42 and right connecting tube 47 undergo the same axial deformation during tightening. When the filter 45 reaches a certain thickness, the protective washer is no longer needed.

[0008] The left locking cap 41 is a hollow cylindrical tube. The hollow left part is a cylindrical cavity 411, the inner diameter of which corresponds to the second optical fiber 3. The hollow middle part of the left locking cap 41 is a tapered cavity 412, the inner diameter of which gradually increases from left to right. The hollow right part of the left locking cap 41 has an internal thread 413. The internal thread 413 is screwed onto the left connecting tube 42. The right locking cap 48 has a similar structure to the left locking cap 41 and is screwed onto the right connecting tube 47. The third optical fiber 5 passes through the right locking cap 48.

[0009] The left connecting tube 42 is an integral structure, and is configured as an axially slotted left tapered tube 421. From the tapered tube 421 to the right, there are sequentially a left external threaded tube 422, a left round tube 423, and a left internal threaded tube 424. A small-diameter left through hole 425 is provided inside the left connecting tube 42, and the inner diameter of the small-diameter left through hole 425 corresponds to that of the optical fiber 3. The left locking cap 41 is threadedly connected to the left external threaded tube 422 of the left connecting tube 42. During tightening, the tapered cavity 412 will compress the left tapered tube 421. Due to the slot on the left tapered tube 421, the diameter of the right end of the left tapered tube 421 can be significantly reduced, thereby securing the second optical fiber 3 inside the left connecting tube 42.

[0010] The right connecting tube 47 is an integral structure. A right tapered tube 471 with an axial groove is provided on the right side of the right connecting tube 47. Moving left from the right tapered tube 471, there are a right externally threaded tube 472, a right circular tube 473, and a right externally threaded tube 474. The right side of the inner cavity of the right connecting tube 47 has a small-diameter right through hole 475, the diameter of which is similar to that of the third optical fiber 5. The right externally threaded tube 474 mates with the left internally threaded tube 424. The left side of the inner cavity of the right externally threaded tube 474 has a circular hole 476, the inner diameter of which is larger than that of the small-diameter right through hole 475. An axial groove 477 is provided on the inner wall of the circular hole 476. When the circumferential fixing tube 43 is not used, the axial groove 477 is not required, and the fastening principle of the third optical fiber 5 is the same as that of the second optical fiber 3.

[0011] The circumferential fixing tube 43 is provided with an axial protrusion 431 that mates with the axial groove 477. Inserting the axial protrusion 431 of the circumferential fixing tube 43 into the axial groove 477 will prevent the circumferential fixing tube 43 from undergoing significant circumferential displacement relative to the left connecting tube 42 during the tightening and connection of the left connecting tube 42 and the right connecting tube 47. This will prevent the left protective washer 44 and the right protective washer 46 from being twisted, deformed, and damaged, and will also protect the safety of the filter 45.

[0012] In this invention, both the left and right connecting tubes are designed as a single unit, and the connection is made by threaded connection, which has a good sealing effect and makes it almost impossible for external dust to enter. The docking of the filter and the optical fiber will introduce some additional insertion loss, but this loss is almost negligible for the filter.

[0013] This invention incorporates a modular filtering function within the optical fiber, enabling the fiber to have adjustable filtering capabilities. An integrated filter allows the fiber to filter out light of specific wavelengths during signal transmission. Compared to traditional methods that only perform filtering at the receiving end, this structure expands the filtering capabilities of the optical fiber itself, meeting the needs for flexible adjustment and multi-scenario applications.

[0014] This invention features a detachable structure that enables rapid filter replacement and diverse selection. The filter is fixed by a threaded clamping method between the left and right connecting tubes, without relying on potting or adhesive materials. The filter can be quickly disassembled and replaced without damaging the structure. It is especially suitable for industrial testing scenarios with different requirements for transmission bands, improving the adaptability and reusability of the equipment.

[0015] This invention employs a combination of threaded locking and a tapered structure to achieve automatic alignment of the fiber optic end face. The tapered cavity structure of the left and right locking caps applies pressure to the tapered tube inside the connecting tube during tightening, causing it to contract radially and firmly positioning the fiber optic cable within the connecting cavity, maintaining axial alignment. This effectively reduces insertion loss between the filter and the fiber optic cable, ensuring the stability and accuracy of optical performance.

[0016] This invention achieves anti-rotation restriction of internal components by setting the axial strip of the circumferential fixing tube to cooperate with the axial groove in the threaded section of the connecting tube, thus avoiding misalignment, slippage or damage of the protective gasket and the filter during tightening; at the same time, it helps to maintain the consistency of repeated assembly and sealing performance of the filter components. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the internal structure of the light-filtering functional component 4 in this utility model;

[0020] Figure 3 This is an internal sectional view of the light-filtering functional component 4 in this utility model;

[0021] Figure 4 An exploded view of the light-filtering functional component 4 in this utility model.

[0022] Explanation of reference numerals in the attached drawings: 1. Fiber optic head; 2. First fiber optic; 3. Second fiber optic; 4. Filtering component; 5. Third fiber optic; 41. Left locking cap; 42. Left connecting tube; 43. Circumferential fixing tube; 44. Left protective washer; 45. Filter; 46. Right protective washer; 47. Right connecting tube; 48. Right locking cap; 411. Cylindrical cavity; 412. Tapered cavity; 413. Internal thread; 421. Left tapered tube; 422. Left external threaded tube; 423. Left round tube; 424. Left internal threaded tube; 425. Small diameter left through hole; 471. Right tapered tube; 472. Right external threaded tube; 473. Right external threaded tube; 474. Small diameter right through hole; 475. Round hole; 476. Axial groove; 477. Axial protrusion; 431. Detailed Implementation

[0023] See Figure 1-4 As shown, the technical solution adopted in this specific embodiment is as follows: it includes an optical fiber head 1, a first optical fiber 2, a second optical fiber 3, a filter element 4, and a third optical fiber 5; the first optical fiber 2 and the second optical fiber 3 pass through the optical fiber head 1 from the left side to its left end face to form an optical path entrance; the second optical fiber 3 continues to pass through the filter element 4 to the right; the third optical fiber 5 passes through the filter element 4 from the right side and optically connects with the second optical fiber 3 at the filter to complete the optical path transmission; the filter element 4 includes a left locking cap 41 and a left... The system comprises a connecting tube 42, a circumferential fixing tube 43, a left protective washer 44, a filter 45, a right protective washer 46, a right connecting tube 47, and a right locking cap 48. The left locking cap 41 is threaded onto the left end of the left connecting tube 42. The left connecting tube 42 and the right connecting tube 47 are threaded together. The circumferential fixing tube 43, left protective washer 44, filter 45, and right protective washer 46 are sequentially arranged inside the left connecting tube 42 and screwed together. The right locking cap 48 is threaded onto the right end of the right connecting tube 47. When tightened, all components are pressed together, achieving positioning and fixing of the filter 45. The second optical fiber 3 passes through the left locking cap 41 and connects to the filter 45 via the left connecting tube 42; the third optical fiber 5 passes through the right locking cap 48 and connects to the filter 5 via the right connecting tube 47. The left protective washer 44 and the right protective washer 46 are for protecting the filter 45 from damage. When the filter 45 is thick enough, the circumferential fixing tube 43, left protective washer 44, and right protective washer 46 are not required. The thicker the filter 45, the less stress it will experience when the left connecting tube 42 and right connecting tube 47 undergo the same axial deformation during tightening. When the filter 45 reaches a certain thickness, the protective washer is no longer needed.

[0024] The left locking cap 41 is a hollow cylindrical tube. The hollow left part is a cylindrical cavity 411, the inner diameter of which corresponds to the second optical fiber 3. The hollow middle part of the left locking cap 41 is a tapered cavity 412, the inner diameter of which gradually increases from left to right. The hollow right part of the left locking cap 41 has an internal thread 413. The internal thread 413 is screwed onto the left connecting tube 42. The right locking cap 48 has a similar structure to the left locking cap 41 and is screwed onto the right connecting tube 47. The third optical fiber 5 passes through the right locking cap 48.

[0025] The left connecting tube 42 is an integral structure, and is configured as an axially slotted left tapered tube 421. From the tapered tube 421 to the right, there are sequentially a left external threaded tube 422, a left round tube 423, and a left internal threaded tube 424. A small-diameter left through hole 425 is provided inside the left connecting tube 42, and the inner diameter of the small-diameter left through hole 425 corresponds to that of the optical fiber 3. The left locking cap 41 is threadedly connected to the left external threaded tube 422 of the left connecting tube 42. During tightening, the tapered cavity 412 will compress the left tapered tube 421. Due to the slot on the left tapered tube 421, the diameter of the right end of the left tapered tube 421 can be significantly reduced, thereby securing the second optical fiber 3 inside the left connecting tube 42.

[0026] The right connecting tube 47 is an integral structure. A right tapered tube 471 with an axial groove is provided on the right side of the right connecting tube 47. Moving left from the right tapered tube 471, there are a right externally threaded tube 472, a right circular tube 473, and a right externally threaded tube 474. The right side of the inner cavity of the right connecting tube 47 has a small-diameter right through hole 475, the diameter of which is similar to that of the third optical fiber 5. The right externally threaded tube 474 mates with the left internally threaded tube 424. The left side of the inner cavity of the right externally threaded tube 474 has a circular hole 476, the inner diameter of which is larger than that of the small-diameter right through hole 475. An axial groove 477 is provided on the inner wall of the circular hole 476. When the circumferential fixing tube 43 is not used, the axial groove 477 is not required, and the fastening principle of the third optical fiber 5 is the same as that of the second optical fiber 3.

[0027] The circumferential fixing tube 43 is provided with an axial protrusion 431 that mates with the axial groove 477. Inserting the axial protrusion 431 of the circumferential fixing tube 43 into the axial groove 477 will prevent the circumferential fixing tube 43 from undergoing significant circumferential displacement relative to the left connecting tube 42 during the tightening and connection of the left connecting tube 42 and the right connecting tube 47. This will prevent the left protective washer 44 and the right protective washer 46 from being twisted, deformed, and damaged, and will also protect the safety of the filter 45.

[0028] In this invention, both the left and right connecting tubes are designed as a single unit, and the connection is made by threaded connection, which has a good sealing effect and makes it almost impossible for external dust to enter. The docking of the filter and the optical fiber will introduce some additional insertion loss, but this loss is almost negligible for the filter.

[0029] This specific embodiment achieves anti-rotation restriction of internal components by setting the axial strip of the circumferential fixing tube to cooperate with the axial groove in the threaded section of the connecting tube, avoiding misalignment, slippage or damage of the protective gasket and filter during tightening; at the same time, it helps to maintain the consistency of repeated assembly and sealing performance of the filter assembly.

[0030] The above description is only used to illustrate the technical solution of this utility model and is not intended to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solution of this utility model, as long as they do not depart from the spirit and scope of the technical solution of this utility model, should be covered within the scope of the claims of this utility model.

Claims

1. A transmission band selectable industrial filtered optical fiber, characterized in that: It includes an optical fiber head (1), a first optical fiber (2), a second optical fiber (3), a filter element (4), and a third optical fiber (5); the first optical fiber (2) and the second optical fiber (3) pass through the optical fiber head (1) from the left to form an optical path entrance on its left end face; the second optical fiber (3) continues to pass through the filter element (4) to the right; the third optical fiber (5) passes through the filter element (4) from the right and is optically connected to the second optical fiber (3) at the filter; the filter element (4) includes a left locking cap (41), a left connecting tube (42), and a circumferential fixing tube (43). ), left protective washer (44), filter (45), right protective washer (46), right connecting tube (47), right locking cap (48); the left locking cap (41) is threaded onto the left end of the left connecting tube (42), the left connecting tube (42) and the right connecting tube (47) are threaded together, the circumferential fixing tube (43), left protective washer (44), filter (45) and right protective washer (46) are sequentially arranged in the left connecting tube (42) and are screwed together, and the right locking cap (48) is threaded onto the right end of the right connecting tube (47).

2. The transmission band selectable industrial filtered optical fiber according to claim 1, characterized in that: The left locking cap (41) is a hollow round tube. The hollow left part is a cylindrical cavity (411). The inner diameter of the cylindrical cavity (411) corresponds to the second optical fiber (3). The hollow middle part of the left locking cap (41) is a conical cavity (412). The inner diameter of the conical cavity (412) gradually increases from left to right. The hollow right part of the left locking cap (41) is an internal thread (413).

3. The transmission band selectable industrial filtered optical fiber according to claim 1, wherein: The left connecting tube (42) is an integral structure. The left connecting tube (42) is set as a left tapered tube (421) with an axial groove. The left tapered tube (421) to the right are the left external thread tube (422), the left round tube (423), and the left internal thread tube (424). The left connecting tube (42) is provided with a small diameter left through hole (425). The inner diameter of the small diameter left through hole (425) is second to correspond to the optical fiber (3).

4. The transmission band selectable industrial filtered optical fiber of claim 1, wherein: The right connecting tube (47) is an integral structure. The right connecting tube (47) has an axially slotted right tapered tube (471) on the right side. From the right tapered tube (471) to the left are the right external threaded tube (474), the right round tube (473), and the right external threaded tube (474). The right side of the inner cavity of the right connecting tube (47) is a small-diameter right through hole (475). The diameter of the small-diameter right through hole (475) is similar to that of the third optical fiber (5). The right external threaded tube (474) is matched with the left internal threaded tube (424). The left side of the inner cavity of the right external threaded tube (474) is a round hole (476). The inner diameter of the round hole (476) is larger than that of the small-diameter right through hole (475). An axial groove (477) is provided on the inner wall of the round hole (476).

5. The selective transmission band industrial filter fiber according to claim 1, characterized in that: The circumferential fixed tube (43) is provided with an axial protrusion (431) that cooperates with the axial groove (477).

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