Optical fiber testing device and testing method

Abstract

The invention provides an optical fiber testing device and method, and relates to the technical field of optical fiber bending loss test.The device comprises a workbench, an expansion bending assembly, two arc-shaped guide rails and two clamping seats; the expanding and bending assembly comprises an expanding base plate and a tensioning air bag, the two arc-shaped guide rails are arranged around the expanding base plate, the two clamping seats are arranged on the arc-shaped guide rails in a sliding mode respectively, and the two testing tables are provided with a detection emitting head and a detection receiving head respectively. The device has the advantages that the bending degree of the optical fiber to be tested can be adjusted under the condition that the optical fiber testing device is not detached, and it is guaranteed that the bending degrees of all points of the testing section of the optical fiber to be tested are kept consistent. According to the invention, the test cylinder composed of the expansion rods is filled with the tensioning air bag, so that the smoothness of the external cambered surface of the test cylinder is improved, and the bending consistency of the optical fiber is improved. The test bench is rotationally arranged on the clamping seat, and it is guaranteed that the detection transmitting head and the detection receiving head vertically enter and vertically receive optical fiber signals.

Description

Technical Field

[0001] The present invention relates to the technical field of optical fiber bending loss testing, and particularly to an optical fiber testing device and a testing method. Background Art

[0002] In the fields of optical fiber communication and sensing, the bending loss of optical fibers is one of the key factors affecting the signal transmission quality. When an optical fiber is bent due to the installation environment or external stress, the optical signals transmitted inside it will incur varying degrees of loss, thereby affecting the performance of the communication system. Therefore, accurately evaluating the optical loss characteristics of optical fibers under different bending radians is of great significance for the design, installation, and maintenance of optical fiber products. Traditional testing methods usually use cylinders with a fixed diameter or bending jigs to perform bending tests on optical fibers. For example, the optical fiber to be tested is wound around a cylinder with a known diameter, and the optical signal loss is measured to evaluate the bending performance of the optical fiber.

[0003] Chinese Patent No. CN201410054691.3 discloses a device and method for bending an optical fiber during macro-bending loss measurement of an optical fiber. The device of this patent includes a base, on which several groups of winding columns with different diameters and several optical fiber clamping strips are provided. Along the length direction of each optical fiber clamping strip, several fracture openings for clamping the optical fiber are evenly distributed. Each group of winding columns is symmetrically arranged on the left and right along the center line of the length direction of the base. A circular installation groove and a strip-shaped through hole adapted to the winding columns and the optical fiber clamping strips are provided on the base. This device can wind the optical fiber around winding columns with different diameters and fix it, and at the same time quickly release the optical fiber from the bent and fixed state.

[0004] During the process of existing optical fiber testing devices, it is difficult to adjust the bending degree of the optical fiber. When it is necessary to test the signal loss of the same optical fiber at different bending degrees, the optical fiber needs to be reinstalled and clamped, which is cumbersome to operate and prone to introducing clamping errors. At the same time, when the bending degree of the optical fiber is changed after clamping in the existing optical fiber testing device, it usually causes changes in the length of the bent section of the optical fiber and the optical incident angle; the simultaneous change in the length and bending degree of the bent section of the optical fiber to be tested is not conducive to the testing principle of the control variable method, and it is difficult to accurately evaluate the relationship between the bending radian of the optical fiber to be tested and the optical fiber signal loss. Moreover, the change in the optical incident angle makes it difficult to ensure that the test head is vertically incident and vertically receives the optical signal, resulting in test errors.

[0005] Therefore, there is an urgent need for an optical fiber testing device and method that can accurately adjust the bending radian and keep the length of the bent section consistent without disassembling the optical fiber, so as to achieve efficient and high-precision optical fiber bending loss testing. Summary of the Invention

[0006] In order to overcome the deficiencies of the prior art, the purpose of the present invention is to provide an optical fiber testing device and a testing method. The present invention enables the optical fiber testing device to adjust the bending degree of the optical fiber to be tested without disassembly, while ensuring that the bending degrees of all points on the test section of the optical fiber to be tested are consistent. The tensioning airbag of the present invention can elastically fill the test cylinder composed of expansion rods, improving the smoothness of the outer arc surface of the test cylinder, thereby improving the consistency of the bending arcs of each part of the optical fiber to be tested. The arc-shaped guide rail and the sliding driving mechanism of the present invention can adjust the winding tangent point position during the diameter adjustment of the expanded cylindrical structure, so that the length of the bent section of the optical fiber to be tested always remains the same as the length of the test section, avoiding the problem that the optical fiber needs to be frequently clamped due to adjusting the length of the bent section, and reducing the test error. The test bench of the present invention is rotatably arranged on the clamping seat, and during the rotation of the test bench relative to the arc-shaped guide rail, it can ensure that the detection transmitting head and the detection receiving head are perpendicular to the incident and perpendicular to receive the optical fiber signal. The optical fiber testing device method of the present invention can test the optical loss rate of the same optical fiber and the same length test section under multiple bending degrees without disassembly, so as to accurately evaluate the relationship between the bending arc of the optical fiber to be tested and the optical fiber signal loss.

[0007] The above technical purpose of the present invention is achieved through the following technical solutions. The optical fiber testing device of the present invention includes a workbench, an expansion and bending assembly, two arc-shaped guide rails, and two clamping seats; The expansion and bending assembly is arranged on the workbench. The expansion and bending assembly includes an expansion base plate and a tensioning airbag. A plurality of expansion chutes are provided on the expansion base plate, and all the expansion chutes are radially arranged relative to the axis of the expansion base plate. A vertically arranged expansion rod is slidably arranged in each expansion chute, and all the expansion rods surround the tensioning airbag; a expansion driving mechanism is further provided at the bottom of the expansion base plate, and the expansion driving mechanism is connected to all the expansion rods. The expansion driving mechanism is used to drive all the expansion rods to slide synchronously in the expansion chutes; Both of the two arc-shaped guide rails are slidably arranged on the workbench. The two arc-shaped guide rails surround the expansion base plate. A sliding driving mechanism is respectively provided on each of the two clamping seats, and each clamping seat is slidably arranged on an arc-shaped guide rail. The sliding driving mechanism is used to drive the clamping seat to move along the arc-shaped guide rail; A test bench is rotatably arranged on each clamping seat. A detection transmitting head and a detection receiving head are respectively provided on the two test benches. The optical fiber to be tested is wound around the expansion rod, and both ends of the optical fiber to be tested are fixedly connected to the detection transmitting head and the detection receiving head respectively; Elastic members are provided on the outer sides of both arc-shaped guide rails, and the elastic members elastically tension the arc-shaped guide rails.

[0008] Furthermore, the outer wall of the tensioning airbag is adhesively connected to all the expansion rods. A connecting air nozzle is provided on the tensioning airbag, and the connecting air nozzle is connected to a two-way air pump through an air pipe.

[0009] Further, an upper limit disk is fixedly arranged above the expansion base plate. A vertical fixed shaft rod is arranged between the upper limit disk and the expansion base plate. The upper and lower ends of the fixed shaft rod are respectively fixed to the expansion base plate and the upper limit disk. A plurality of upper limit grooves are arranged on the upper limit disk. The upper limit grooves are aligned with the expansion chutes one by one. The upper end of the expansion rod is slidably limited in the upper limit grooves.

[0010] Further, the tensioning airbag is an annular airbag, and the tensioning airbag is sleeved outside the fixed shaft rod.

[0011] Further, the expansion driving mechanism includes a lifting guide rod, a plurality of hinged rods and a lifting driving module. The lifting guide rod is fixedly connected to the bottom of the expansion base plate. A lifting sliding sleeve is slidably sleeved on the lifting guide rod. The upper end of each hinged rod is hinged to the lower end of an expansion rod. The lower ends of all the hinged rods are hinged to the outer wall of the lifting sliding sleeve. The lifting driving module is used to drive the lifting sliding sleeve to lift along the lifting guide rod.

[0012] Further, the lifting driving module includes a lifting driving motor, a limiting plate and a lifting threaded sleeve. The upper end of the lifting threaded sleeve is connected to the lifting sliding sleeve. The lifting driving motor is fixed below the limiting plate. The limiting plate is provided with a limiting hole. Limiting grooves are arranged on both sides of the limiting hole. The outer wall of the lifting threaded sleeve is provided with limiting convex strips. The lifting threaded sleeve is slidably arranged in the limiting hole, and the limiting convex strips are slidably limited in the limiting grooves. The inner wall of the lifting threaded sleeve is provided with a lifting thread. A driving screw rod is connected to the output shaft of the lifting driving motor. The driving screw rod extends into the lifting threaded sleeve and is in threaded cooperation with the lifting threaded sleeve.

[0013] Further, the sliding driving mechanism includes a sliding driving motor, and a sliding driving gear is connected to the output shaft of the sliding driving motor. An arc-shaped guide groove is arranged on the arc-shaped guide rail. An arc-shaped rack is arranged inside the arc-shaped guide rail. A sliding guide rod is arranged at the lower part of the clamping seat. The sliding guide rod is slidably limited in the arc-shaped guide groove. The sliding driving motor is fixedly connected to the lower end of the sliding guide rod. The sliding driving gear meshes with the arc-shaped rack.

[0014] Further, a rotating mounting hole is arranged in the middle of the clamping seat. A rotating mounting shaft is arranged at the lower end of the test bench. The rotating mounting shaft is rotatably arranged in the rotating mounting hole.

[0015] The optical fiber testing device method of the present invention uses the above optical fiber testing device, and the method includes the following steps: S1: Obtain the optical fiber to be tested, and mark a predetermined length of the optical fiber segment to be tested on the optical fiber to be tested by using two marking points; S2: Wind the optical fiber to be measured around the expansion rod and the tensioning airbag, and clamp the two ends of the optical fiber to be measured on the detection transmitting head and the detection receiving head respectively; S3: Adjust the winding of the optical fiber to be measured around the expansion rod and the tensioning airbag, and clamp the two ends of the optical fiber to be measured on the detection transmitting head and the detection receiving head respectively; S4: Adjust the positions of the two clamping seats through the sliding driving mechanism so that the two marking points become the winding tangent points respectively; S: The detection transmitting head emits detection light of a predetermined intensity to one end of the optical fiber to be measured, the detection receiving head acquires the detection light to measure the beam intensity, and calculates the optical signal loss of the optical fiber segment to be measured under this bending degree; S6: Adjust the diameter of the expansion and bending assembly to adjust the bending degree of the optical fiber segment to be measured wound on the expansion and bending assembly, repeat steps S3 - S4, and calculate the optical signal loss of the optical fiber segment to be measured under another bending degree.

[0016] Further, the method for adjusting the diameter of the expansion and bending assembly in step S6 includes the following steps: S61: The expansion driving mechanism synchronously adjusts the distances of all the expansion rods relative to the axis of the expansion base plate; S62: Start the two - way air pump to adjust the air pressure in the tensioning airbag so that the outer wall arc of the tensioning airbag fills the gap between adjacent expansion rods.

[0017] The beneficial effects of an optical fiber testing device and a testing method of the present invention are as follows: (1) The optical fiber testing device includes an expansion and bending assembly, two arc - shaped guide rails, and two clamping seats. The expansion and bending assembly includes a plurality of expansion rods that can form a test cylinder structure and an expansion driving mechanism. The optical fiber to be measured is wound around the expansion rods, and the two ends of the test section of the optical fiber to be measured are the winding tangent points respectively. The two ends of the optical fiber to be measured are clamped on the detection transmitting head and the detection receiving head respectively. And the expansion driving mechanism can drive the expansion rods to move synchronously to adjust the outer diameter of the test cylinder formed by the expansion rods, so that the bending degree of the optical fiber to be measured is adjustable. When the test cylinder expands to a larger diameter, the optical fiber wound on the cylinder expansion mechanism is likely to be wound into a polygonal structure. The two - way air pump can inflate the tensioning airbag to make the tensioning airbag expand, and the expanded tensioning airbag can arc - fill the gap between adjacent expansion rods to ensure an arc transition of the gap between the expansion rods of the cylinder expansion mechanism, so that the outer wall of the test cylinder is smooth. The present invention combines the elastic filling of the tensioning airbag of the test cylinder structure formed by the expansion rods and the expansion driving mechanism, so that the optical fiber testing device can adjust the outer diameter of the test cylinder by synchronously adjusting the distances of the expansion rods relative to the axis of the expansion base plate, making the bending degree of the optical fiber to be measured wound on the expansion cylinder structure adjustable. In this way, the optical fiber testing device can adjust the bending degree of the optical fiber to be measured without disassembly, while ensuring that the bending degrees of all points of the test section of the optical fiber to be measured are consistent.

[0018] (2) The two test benches of the optical fiber testing device are respectively arranged on two arc-shaped guide rails in a movable manner, and the test benches slide along the arc-shaped guide rails under the drive of a test bench sliding drive mechanism. After the optical fiber to be tested is clamped, during the process of adjusting the outer diameter of the test cylinder to change the bending degree of the optical fiber to be tested, the position of the winding tangent point of the optical fiber to be tested will change, which will cause an error between the length of the bent section and the length of the test section of the optical fiber to be tested. By adjusting the position of the test bench on the arc-shaped guide rail, the optical fiber testing device can actively adjust the position of the winding tangent point of the optical fiber to be tested, so as to ensure that after the bending degree of the optical fiber to be tested changes, the position of the winding tangent point of the optical fiber to be tested remains unchanged, and the error between the length of the bent section and the length of the test section of the optical fiber to be tested is eliminated. The arc-shaped guide rail and the sliding drive mechanism of the present application can adjust the position of the winding tangent point during the process of adjusting the diameter of the expanded cylindrical structure, so that the length of the bent section of the optical fiber to be tested always remains the same as the length of the test section, avoiding the problem that the optical fiber needs to be frequently clamped due to adjusting the length of the bent section, and reducing the test error.

[0019] (3) The test bench of the optical fiber testing device is rotatably arranged on the clamping seat, so that the angles of the detection transmitting head and the detection receiving head on the test bench relative to the arc-shaped guide rail can be adaptively adjusted; in this way, during the rotation of the test bench relative to the arc-shaped guide rail, the detection transmitting head and the detection receiving head can adaptively adjust their own angles to ensure that the detection transmitting head and the detection receiving head are perpendicular to the incident and perpendicular to receive the optical fiber signal, further reducing the test error.

[0020] (4) The optical fiber testing device method of the present invention can test the optical loss rate of the same optical fiber and the same length test section under the condition of not disassembling, and test the relationship between the bending radian of the optical fiber to be tested and the optical fiber signal loss. Description of the Drawings

[0021] Figure 1 is a three-dimensional structure schematic diagram of the overall structure of an optical fiber testing device according to an embodiment of the present invention.

[0022] Figure 2 is a front view of the overall structure of an optical fiber testing device according to an embodiment of the present invention.

[0023] Figure 3 is a top view of the overall structure of an optical fiber testing device according to an embodiment of the present invention.

[0024] Figure 4 is an installation structure diagram of the arc-shaped guide rail and the sliding drive motor of an optical fiber testing device according to an embodiment of the present invention.

[0025] Figure 5 is an installation structure diagram of the test bench and the clamping seat of an optical fiber testing device according to an embodiment of the present invention.

[0026] Figure 6 It is the installation structure diagram of the tensioning airbag and the expansion rod of an optical fiber testing device according to an embodiment of the present invention.

[0027] Figure 7 It is the first partial structure schematic diagram of an optical fiber testing device according to an embodiment of the present invention.

[0028] Figure 8 It is the second partial structure schematic diagram of an optical fiber testing device according to an embodiment of the present invention.

[0029] Figure 9 It is the flowchart of a method for an optical fiber testing device of the present invention.

[0030] In the above figures: 100 - workbench, 101 - guide rail chute, 102 - support leg, 103 - lower support plate, 200 - expansion base plate, 201 - expansion chute, 202 - upper limit disk, 203 - upper limit groove, 204 - fixed shaft rod, 205 - tensioning airbag, 206 - two - way air pump, 300 - expansion rod, 301 - lifting guide rod, 302 - hinge rod, 303 - lifting sliding sleeve, 400 - lifting drive motor, 401 - drive screw rod, 402 - lifting thread sleeve, 403 - limit rib, 404 - limit plate, 500 - arc - shaped guide rail, 501 - arc - shaped guide groove, 502 - arc - shaped rack, 503 - fixed block, 504 - elastic member, 505 - limit convex rod, 600 - clamping seat, 601 - sliding guide rod, 602 - sliding drive motor, 603 - sliding drive gear, 700 - test bench, 701 - detection transmitting head, 702 - detection receiving head, 703 - clamping sleeve, 704 - rotating mounting shaft, 800 - optical fiber to be tested, 801 - winding tangent point. Detailed implementation manners

[0031] In order to make the purpose, technical solutions and advantages of the present invention clearer, the following further elaborates on the present invention in detail in conjunction with embodiments. Of course, the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0032] Although the steps in the present invention are arranged with reference signs, they are not used to limit the sequence of steps. Unless the sequence of steps is clearly stated or the execution of a certain step requires other steps as a basis, the relative sequence of steps can be adjusted. It can be understood that the term "and / or" used herein relates to and encompasses any and all possible combinations of one or more of the associated listed items.

[0033] Please refer to Figures 1 to 8 , the above - mentioned technical objectives of the present invention are achieved through the following technical solutions. The optical fiber testing device of the present invention includes a workbench 100, an expansion and bending assembly, two arc - shaped guide rails 500, and two clamping seats 600.

[0034] The workbench 100 is a rectangular plate. There are multiple guide rail chutes 101 on the workbench 100. At the bottom of the workbench 100, there are multiple support legs 102 and a lower support plate 103. The support legs 102 fixedly support the workbench 100 and the lower support plate 103.

[0035] The expansion and bending assembly is arranged on the workbench 100. The expansion and bending assembly includes an expansion base plate 200 and a tensioning airbag 205. The expansion base plate 200 is a circular plate. There are multiple expansion chutes 201 on the expansion base plate 200. All the expansion chutes 201 are radially arranged relative to the axis of the expansion base plate 200. A vertically arranged expansion rod 300 is slidably arranged in each expansion chute 201. The distances of the multiple expansion rods 300 from the axis of the expansion base plate 200 are all equal. All the expansion rods 300 surround the tensioning airbag 205. The tensioning airbag 205 arc-fills the gaps between adjacent expansion rods 300, so that the expansion rods 300 form an expandable test cylinder structure. Specifically, the outer wall of the tensioning airbag 205 is adhesively connected to all the expansion rods 300. A connecting air nozzle is arranged on the tensioning airbag 205. The connecting air nozzle is connected to a two-way air pump 206 through an air pipe.

[0036] The bottom of the expansion base plate 200 is also provided with an expansion driving mechanism. The expansion driving mechanism is connected to all the expansion rods 300. The expansion driving mechanism is used to drive all the expansion rods 300 to slide synchronously in the expansion chutes 201, so as to achieve the effect of adjusting the diameter of the test cylinder.

[0037] Both of the arc-shaped guide rails 500 are slidably arranged on the workbench 100. The arc-shaped guide rails 500 are symmetrically arranged and surround the expansion and bending assembly. A limiting convex rod is arranged at the bottom of the arc-shaped guide rail 500. The limiting convex rod is slidably limited in the guide rail chute 101. The two arc-shaped guide rails 500 surround the expansion base plate 200. A sliding driving mechanism is respectively arranged on the two clamping seats 600. Each clamping seat 600 is slidably arranged on an arc-shaped guide rail 500. The sliding driving mechanism is used to drive the clamping seat 600 to move along the arc-shaped guide rail 500.

[0038] A test bench 700 is rotatably arranged on each clamping seat 600. A detection transmitter 701 and a detection receiver 702 are respectively arranged on the two test benches 700. Clamping sleeves 703 for clamping the end of the optical fiber are arranged on both the detection transmitter 701 and the detection receiver 702. The optical fiber to be tested 800 is wound around the expansion rod 300. The two ends of the optical fiber to be tested 800 are respectively fixedly clamped on the detection transmitter 701 and the detection receiver 702. By adjusting the position of the test bench 700 on the arc-shaped guide rail 500, the winding tangent point position of the optical fiber to be tested 800 on the test cylinder structure can be adjusted.

[0039] Elastic members 503 are provided on the outer sides of both arc-shaped guide rails 500. Fixed blocks are provided on the workbench 100. The elastic members 503 are spiral springs, and the two ends of the spiral springs are respectively connected to the arc-shaped guide rails 500 and the fixed blocks. The elastic members 503 elastically tension the arc-shaped guide rails 500, so that the optical fiber 800 to be measured is always in a tensioned state.

[0040] Understandably, after the optical fiber 800 to be measured is clamped, it includes a bent section and a straight section. The two ends of the bent section are the winding tangent points. The distance from the winding tangent points to the end of the optical fiber 800 to be measured is the straight section. During testing, the bending loss of the optical fiber occurs in the bent section. The optical fiber loss of the straight section of the optical fiber 800 to be measured can be removed by calculation or ignored (the loss of the optical fiber in the straight section is usually a known parameter).

[0041] During the test of this optical fiber testing device, the optical fiber 800 to be measured is wound around the expansion rod 300, and the two ends of the test section of the optical fiber 800 to be measured are respectively the winding tangent points. The two ends of the optical fiber 800 to be measured are respectively clamped on the detection transmitting head 701 and the detection receiving head 702. In this way, it can be ensured that the test section (i.e., the bent section) of the optical fiber 800 to be measured is completely wound on the expansion and bending assembly during the test, and the bending degrees of all points of the test section of all the optical fibers 800 to be measured are kept consistent. And the expansion driving mechanism can drive the expansion rod 300 to move synchronously, adjust the outer diameter of the test cylinder composed of the expansion rods 300, so that the bending degree of the optical fiber 800 to be measured can be adjusted. The present invention adopts a test cylinder structure that can be expanded, and can adjust the outer diameter of the test cylinder by synchronously adjusting the distance between the expansion rod 300 and the axis of the expansion base plate 200, so that the bending degree of the optical fiber 800 to be measured wound on this expansion cylinder structure can be adjusted. In this way, the optical fiber testing device can adjust the bending degree of the optical fiber to be measured without disassembly, and at the same time ensure that the bending degrees of all points of the test section of the optical fiber 800 to be measured are kept consistent.

[0042] The tensioning airbag 205 of this optical fiber testing device is connected to the two-way air pump 206. When the test cylinder expands to a larger diameter, the optical fiber wound around the test cylinder composed of the expansion rods 300 is likely to be wound into a polygonal structure. The two-way air pump 206 can inflate the tensioning airbag 205 to make the tensioning airbag 205 expand, and the expanded tensioning airbag 205 can arc-fill the gap between adjacent expansion rods 300, ensuring an arc transition of the gap between the expansion rods 300 of the cylinder expansion mechanism, so that the outer wall of the test cylinder is smooth. The present invention adopts the tensioning airbag 205 to elastically fill the test cylinder composed of the expansion rods 300, which can improve the smoothness of the outer arc surface of the test cylinder, thereby improving the consistency of the bending arcs of each part of the optical fiber to be tested.

[0043] Understandably, when the test cylinder expands and contracts, the air pressure in the tensioning airbag 205 can be adjusted through the two-way air pump 206 to ensure that the tensioning airbag 205 can always arc-fill the gap between adjacent expansion rods 300.

[0044] In a preferred embodiment, an upper limit disk 202 is fixedly provided above the expansion base plate 200. A vertical fixed shaft rod 204 is provided between the upper limit disk 202 and the expansion base plate 200. The upper and lower ends of the fixed shaft rod 204 are respectively fixed to the expansion base plate 200 and the upper limit disk 202. A plurality of upper limit grooves 203 are provided on the upper limit disk 202. The upper limit grooves 203 are aligned with the expansion chutes 201 one by one. The upper end of the expansion rod 300 is slidably limited within the upper limit grooves 203. The expansion chute 201 is a stepped chute, so that the upper end of the expansion rod 300 can fit against the bottom of the chute, which can prevent the expansion rod 300 from tilting during sliding in the stepped chute, ensuring that the expansion rod 300 is in a vertical state during the sliding process in the stepped chute.

[0045] In a preferred embodiment, the expansion driving mechanism includes a lifting guide rod 301, a plurality of hinged rods 302, and a lifting driving module. The lifting guide rod 301 is fixedly connected to the bottom of the expansion base plate 200. A lifting sliding sleeve 303 is slidably sleeved on the lifting guide rod 301. The upper end of each hinged rod 302 is hinged to the lower end of an expansion rod 300. The lower ends of all the hinged rods 302 are hinged to the outer wall of the lifting sliding sleeve 303. The lifting driving module is used to drive the lifting sliding sleeve 303 to lift along the lifting guide rod 301.

[0046] The lifting driving module includes a lifting driving motor 400, a limit plate 404, and a lifting threaded sleeve 402. The upper end of the lifting threaded sleeve 402 is connected to the lifting sliding sleeve 303. The lifting driving motor 400 is fixed below the limit plate 404. The limit plate 404 is provided with a limit hole, and limit grooves are provided on both sides of the limit hole. A limit rib 403 is provided on the outer wall of the lifting threaded sleeve 402. The lifting threaded sleeve 402 is slidably arranged in the limit hole, and the limit rib 403 is slidably limited within the limit groove. The inner wall of the lifting threaded sleeve 402 is provided with a lifting thread. A driving screw rod 401 is connected to the output shaft of the lifting driving motor 400. The driving screw rod 401 extends into the lifting threaded sleeve 402 and is in threaded cooperation with the lifting threaded sleeve 402. The cooperation structure of the limit rib 403 and the limit groove restricts the rotation of the lifting threaded sleeve 402, so that the lifting threaded sleeve 402 moves up and down in the limit hole under the driving of the rotation of the driving screw rod 401.

[0047] In a preferred embodiment, the sliding drive mechanism includes a sliding drive motor 602, and a sliding drive gear 603 is connected to the output shaft of the sliding drive motor 602; an arc-shaped guide groove 501 is provided on the arc-shaped guide rail 500, and an arc-shaped rack 502 is provided inside the arc-shaped guide rail 500. A sliding guide rod 601 is provided at the lower part of the clamping seat 600. The sliding guide rod 601 is slidably limited in the arc-shaped guide groove 501. The sliding drive motor 602 is fixedly connected to the lower end of the drive motor, and the sliding drive gear 603 meshes with the arc-shaped rack 502. When the sliding drive motor 602 drives the sliding drive gear 603 to rotate, the sliding guide rod 601 and the clamping seat 600 can be driven to move along the arc-shaped guide groove 501.

[0048] In a preferred embodiment, a rotating mounting hole is provided in the middle of the clamping seat 600, and a rotating mounting shaft 704 is provided at the lower end of the test bench 700. The rotating mounting shaft 704 is rotatably arranged in the rotating mounting hole. The test bench 700 of the optical fiber testing device is rotatably arranged on the clamping seat 600, so that the angles of the detection transmitting head 701 and the detection receiving head 702 on the test bench 700 relative to the arc-shaped guide rail 500 can be adaptively adjusted; in this way, during the rotation of the test bench 700 relative to the arc-shaped guide rail 500, the detection transmitting head 701 and the detection receiving head 702 can adaptively adjust their own angles to ensure that the detection transmitting head 701 and the detection receiving head 702 vertically incident and vertically receive optical fiber signals, further reducing the test error.

[0049] Reference Figure 9 , for the optical fiber testing device method of the present invention, this method uses the above-mentioned optical fiber testing device, and this method includes the following steps: S1: Obtain the optical fiber 800 to be tested, and mark a predetermined length of the optical fiber segment to be tested on the optical fiber 800 to be tested with two marking points; S2: Wind the optical fiber 800 to be tested around the expansion rod 300 and the tensioning airbag 205, and respectively clamp the two ends of the optical fiber 800 to be tested on the detection transmitting head 701 and the detection receiving head 702; S3: Adjust the optical fiber 800 to be tested to be wound around the expansion rod 300 and the tensioning airbag 205, and respectively clamp the two ends of the optical fiber 800 to be tested on the detection transmitting head 701 and the detection receiving head 702; S4: Adjust the positions of the two clamping seats 600 through the sliding drive mechanism so that the two marking points respectively become the winding tangent points; S5: The detection transmitting head 701 emits a detection light of a predetermined intensity to one end of the optical fiber 800 to be tested, the detection receiving head 702 acquires the detection light to measure the beam intensity, and calculates the optical signal loss of the optical fiber segment to be tested under this bending degree; S6: Adjust the diameter of the expansion and bending component to adjust the curvature of the optical fiber segment to be measured wound around the expansion and bending component, repeat steps S4 - S5, and calculate the optical signal loss of the optical fiber segment to be measured at another curvature.

[0050] Further, the method for adjusting the diameter of the expansion and bending component in step S6 includes the following steps: S61: The expansion driving mechanism synchronously adjusts the distances of all expansion rods 300 relative to the axis of the expansion base plate 200; S62: Start the two - way air pump 206 to adjust the air pressure in the tensioning airbag 205, so that the outer wall arc of the tensioning airbag 205 fills the gap between adjacent expansion rods 300.

[0051] In this article, the front, rear, upper, lower and other orientation words are defined based on the positions of the components in the drawings and the relative positions of the components to each other, only for the clarity and convenience of expressing the technical solution. It should be understood that the use of the orientation words should not limit the scope of protection requested by this application.

[0052] Without conflict, the above - mentioned embodiments and the features in the embodiments in this article can be combined with each other.

[0053] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An optical fiber testing device, characterized in that, It includes a workbench (100), an expansion and bending assembly, two arc-shaped guide rails (500) and two clamping seats (600); The expansion and bending assembly is arranged on the workbench (100). The expansion and bending assembly includes an expansion base plate (200) and a tensioning airbag (205). A plurality of expansion chutes (201) are provided on the expansion base plate (200). All the expansion chutes (201) are radially arranged relative to the axis of the expansion base plate (200). A vertically arranged expansion rod (300) is slidably arranged in each expansion chute (201). All the expansion rods (300) surround the tensioning airbag (205). An expansion driving mechanism is further provided at the bottom of the expansion base plate (200). The expansion driving mechanism is connected to all the expansion rods (300). The expansion driving mechanism is used to drive all the expansion rods (300) to slide synchronously in the expansion chutes (201); Both of the two arc-shaped guide rails (500) are slidably arranged on the workbench (100). A sliding driving mechanism is respectively provided on the two clamping seats (600). Each clamping seat (600) is slidably arranged on an arc-shaped guide rail (500). The sliding driving mechanism is used to drive the clamping seat (600) to move along the arc-shaped guide rail (500); A test bench (700) is rotatably arranged on each clamping seat (600). A detection transmitting head (701) and a detection receiving head (702) are respectively provided on the two test benches (700). The optical fiber to be tested (800) is wound around the expansion rod (300). The two ends of the optical fiber to be tested (800) are respectively fixedly connected to the detection transmitting head (701) and the detection receiving head (702); Elastic members (�04) are provided on the outer sides of both of the two arc-shaped guide rails (500). The elastic members (504) elastically tension the arc-shaped guide rails (500).

2. The optical fiber testing device according to claim 1, wherein The outer wall of the tensioning airbag (205) is adhesively connected to all the expansion rods (300). A connecting air nozzle is provided on the tensioning airbag (205). The connecting air nozzle is connected to a two-way air pump (206) through an air pipe.

3. The optical fiber testing device according to claim 2, characterized in that, An upper limit disk (202) is fixedly provided above the expansion base plate (200). A vertically arranged fixed shaft rod (204) is provided between the upper limit disk (202) and the expansion base plate (200). The upper and lower ends of the fixed shaft rod (204) are respectively fixed to the expansion base plate (200) and the upper limit disk (202). A plurality of upper limit slots (203) are provided on the upper limit disk (202). The upper limit slots (203) are aligned with the expansion chutes (201) one by one. The upper ends of the expansion rods (300) are slidably limited in the upper limit slots (203).

4. A fiber optic testing device according to claim 1, wherein The tensioning airbag (205) is an annular airbag. The tensioning airbag (205) is sleeved outside the fixed shaft rod (204).

5. A fiber optic testing device according to claim 1, characterized in that, The expansion driving mechanism includes a lifting guide rod (301), a plurality of hinged rods (302) and a lifting driving module. The lifting guide rod (301) is fixedly connected to the bottom of the expansion base plate (200). A lifting sliding sleeve (303) is slidably sleeved on the lifting guide rod (301). The upper end of each hinged rod (302) is hinged to the lower end of an expansion rod (300). The lower ends of all the hinged rods (302) are hinged to the outer wall of the lifting sliding sleeve (303). The lifting driving module is used to drive the lifting sliding sleeve (303) to lift along the lifting guide rod (301).

6. The optical fiber testing device according to claim 1, characterized in that, The lifting driving module includes a lifting driving motor (400), a limiting plate (404) and a lifting threaded sleeve (402). The upper end of the lifting threaded sleeve (402) is connected to the lifting sliding sleeve (303). The driving motor is fixed below the limiting plate (404). The limiting plate (404) is provided with a limiting hole. Limiting grooves are arranged on both sides of the limiting hole. A limiting rib (403) is arranged on the outer wall of the lifting threaded sleeve (402). The lifting threaded sleeve (402) is slidably arranged in the limiting hole, and the limiting rib (403) is slidably limited in the limiting groove. The inner wall of the lifting threaded sleeve (402) is provided with a lifting thread. A driving screw rod (401) is connected to the output shaft of the lifting driving motor (400). The driving screw rod (401) extends into the lifting threaded sleeve (402) and is in threaded cooperation with the lifting threaded sleeve (402).

7. An optical fiber testing device according to claim 1, characterized in that, The sliding driving mechanism includes a sliding driving motor (602). A sliding driving gear (603) is connected to the output shaft of the sliding driving motor (602). An arc-shaped guide groove (501) is arranged on the arc-shaped guide rail (500). An arc-shaped rack (502) is arranged inside the arc-shaped guide rail (500). A sliding guide rod (601) is arranged at the lower part of the clamping seat (600). The sliding guide rod (601) is slidably limited in the arc-shaped guide groove (501). The sliding driving motor (602) is fixedly connected to the lower end of the sliding guide rod (601). The sliding driving gear (603) is meshed with the arc-shaped rack (502).

8. An optical fiber testing device according to claim 1, characterized in that, A rotating mounting hole is arranged in the middle of the clamping seat (600). A rotating mounting shaft (704) is arranged at the lower end of the test bench (700). The rotating mounting shaft (704) is rotatably arranged in the rotating mounting hole.

9. A method for an optical fiber testing device, characterized in that This method uses the optical fiber testing device method described in any one of claims 1-8. This method includes the following steps: S1: Obtain the optical fiber to be tested (800), and mark a predetermined length of the optical fiber section to be tested on the optical fiber to be tested (800) by using two marking points. S2: Wind the optical fiber to be tested (800) around the expansion rod (300) and the tensioning airbag (205), and respectively clamp the two ends of the optical fiber to be tested (800) on the detection transmitting head (701) and the detection receiving head (702). S3: Adjust the winding of the optical fiber to be tested (800) around the expansion rod (300) and the tensioning airbag (205), and respectively clamp the two ends of the optical fiber to be tested (800) on the detection transmitting head (701) and the detection receiving head (702). S4: Adjust the positions of the two clamping seats (600) through the sliding drive mechanism so that the two marking points respectively become the winding tangent points; S5: The detection emitter (701) emits detection light of a predetermined intensity towards one end of the optical fiber under test (800). The detection receiver (702) acquires the detection light to measure the beam intensity, and calculates the optical signal loss of the optical fiber segment under test at this bending degree; S6: Adjust the diameter of the expansion and bending assembly to adjust the bending degree of the optical fiber segment under test wound on the expansion and bending assembly, repeat steps S3 - S4, and calculate the optical signal loss of the optical fiber segment under test at another bending degree.

10. The method of an optical fiber testing device according to claim 9, wherein: The method for adjusting the diameter of the expansion and bending assembly in step S5 includes the following steps: S51: The expansion drive mechanism synchronously adjusts the distances of all the expansion rods (300) relative to the axis of the expansion base plate (200); S52: Start the two-way air pump (206) to adjust the air pressure in the tensioning airbag (205), so that the outer wall arc of the tensioning airbag (205) fills the gap between adjacent expansion rods (300).

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