An optical fiber attenuation length measurement device, system, and method

Abstract

The application discloses a kind of optical fiber attenuation length measuring device, system and method, the measuring device includes: linear guide rail, the light-tight sliding table is arranged on the linear guide rail, at least one through hole is provided on the sliding table, the axis of the through hole is parallel with the guiding direction of the linear guide rail;At least two optical fiber support members are arranged at intervals along the guiding direction of the linear guide rail, and the sliding table is located between the two optical fiber support members;The sliding table is provided with light transmission hole corresponding to the through hole one by one;Light emitting component is used to emit light through each light transmission hole to the through hole;And photoelectric detection element is used to collect light intensity.The application realizes the automatic measurement and analysis of optical fiber attenuation length, with the advantages of accurate, reliable, repeatable measurement results;And batch detection of multiple optical fibers is realized.

Description

Technical Field

[0001] This application generally relates to the field of optical fiber characteristic parameter measurement technology, and specifically to an optical fiber attenuation length measurement device, system and method. Background Technology

[0002] Wavelength-shifted fiber, also known as wave-shifted optical fiber, is widely used in particle detectors. Photons that meet the total internal reflection condition propagate along the fiber and eventually exit from the fiber end face. Because optical fibers absorb photons to some extent, the intensity of the emitted light decreases exponentially with increasing propagation distance; this is called fiber attenuation. The attenuation length of wave-shifted fiber is an important indicator reflecting its attenuation characteristics. Current methods for measuring the attenuation length of wave-shifted fiber generally involve sequentially irradiating the fiber with blue-violet light from multiple points on its side and calculating the attenuation length by sequentially measuring the output power at the output end. After measuring one point, the incident position of the irradiating light on the fiber needs to be manually changed to measure the next point. Furthermore, only one fiber can be measured at a time, resulting in drawbacks such as being time-consuming, labor-intensive, slow, and having poor measurement accuracy. Summary of the Invention

[0003] In view of the above-mentioned defects or deficiencies in the prior art, this application aims to provide an optical fiber attenuation length measuring device, system and method to solve the defects in the prior art that cannot measure the optical fiber attenuation length in batches, quickly and accurately.

[0004] As a first aspect of this application, this application provides an optical fiber attenuation length measuring device.

[0005] Preferably, the fiber attenuation length measuring device includes:

[0006] A linear guide rail, wherein an opaque slide table is slidably disposed on the linear guide rail, and at least one through hole is provided on the slide table, the axis of the through hole being parallel to the guiding direction of the linear guide rail;

[0007] At least two fiber optic supports are spaced apart along the guiding direction of the linear guide rail, and the slide is located between the two fiber optic supports.

[0008] The slide is provided with light-transmitting holes that correspond one-to-one with the through holes;

[0009] Light emitting components are used to emit light through each of the light-transmitting holes into the through-hole; and

[0010] Photoelectric detection elements are used to collect light intensity.

[0011] Preferably, the light emitting component includes a light source and a beam splitter, wherein the beam splitter is used to decompose the light emitted by the light source to generate multiple sub-beams with the same illumination intensity.

[0012] Preferably, the light source emission component further includes a beam expander for expanding the sub-beams output by the beam splitter. The beam expander is disposed at the opening of the light-transmitting hole, and the light from the light source passes through the beam splitter, the beam expander and the light-transmitting hole in sequence before exiting into the through hole.

[0013] Preferably, the optical fiber support has at least one support area for supporting the optical fiber, and the support area is coaxially arranged in a one-to-one correspondence with the through hole.

[0014] Preferably, the fiber optic attenuation length measuring device further includes a drive device for driving the slide to reciprocate along the linear track.

[0015] Preferably, the linear guide rail, the light emitting component, the photoelectric detection element, and the driving device are all housed in a dark box.

[0016] As a second aspect of this application, this application provides an optical fiber attenuation length measurement system.

[0017] Preferably, the fiber optic attenuation length measurement system includes the fiber optic attenuation length measurement device and the analysis and processing unit described in the first aspect. The analysis and processing unit is used to determine the attenuation length of the fiber optic cable based on the light intensity collected by the photoelectric detection element when the light emitting component is located at different positions.

[0018] As a third aspect of this application, this application provides a method for measuring the attenuation length of an optical fiber.

[0019] Preferably, the fiber attenuation length measurement method is performed using the fiber attenuation length measurement system as described in the second aspect, and includes the following steps:

[0020] Irradiate the optical fiber passing through the through hole with light of a specific intensity;

[0021] The position of the light beam on the optical fiber is changed at least once;

[0022] The attenuation length of the optical fiber is calculated based on the light intensity obtained from at least two illuminations.

[0023] Preferably, the calculation of the attenuation length of the optical fiber based on the light intensity obtained from at least two illuminations is performed according to the following formula:

[0024] I = I0 exp(-x / λ);

[0025] Where I is the light intensity obtained when the light irradiates the optical fiber at a certain position, I0 is the initial light intensity, x is the relative distance between the light irradiation position and the photoelectric detection element when the light irradiates the optical fiber at a certain position, and λ is the attenuation length.

[0026] The slope of the curve plotted according to the above formula is obtained by linear fitting, which is the attenuation length of the optical fiber.

[0027] Preferably, the optical fiber is a wave-shifting optical fiber;

[0028] The optical fiber has two corresponding end faces, one of which is connected to the photoelectric detection element as the output end, and the other end face is blackened.

[0029] The beneficial effects of this application are:

[0030] The measuring device and system of this application realize the automated measurement and analysis of optical fiber attenuation length. Compared with manual operation, it has the advantages of more accurate, reliable and repeatable measurement results. Moreover, it enables batch and simultaneous testing of multiple optical fibers, which greatly improves measurement efficiency. At the same time, the measuring device, system and method of this application are simple and quick to operate. Operators only need to install and replace optical fibers as needed, without special training. It can also be used to check for damage and defects on the surface of optical fibers. Attached Figure Description

[0031] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0032] Figure 1 This is a schematic diagram of the structure of a fiber optic attenuation length measuring device according to a preferred embodiment of this application;

[0033] Figure 2 This is a schematic diagram of the structure of a preferred embodiment of the fiber optic attenuation length measurement system of this application;

[0034] Figure 3 This is a flowchart of a preferred embodiment of the fiber optic attenuation length measurement method of this application;

[0035] Figure 4 This is a screenshot showing the calculation results when using the fiber optic attenuation length measurement system of this application to perform batch measurement of the attenuation length of multiple optical fibers.

[0036] Reference numerals: 1. Linear guide rail; 2. Slide table; 20. Through hole; 21. Light transmission hole; 3. Fiber optic support; 4. Light emission component; 40. Light source; 41. Beam splitter; 42. Beam expander; 5. Photoelectric detection element; 6. Drive device; 7. Dark box; 8. Fiber optic cable; 80. Emission end; 81. End face; 9. Analysis and processing unit; 10. Analog-to-digital conversion unit; 11. Pulse signal generation unit; 12. Driver; 13. Power supply. Detailed Implementation

[0037] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0038] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0039] It should be noted that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0040] It should be noted that in the description of this application, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features.

[0041] It should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0042] According to the first aspect of this application, please refer to Figure 1This application shows a preferred embodiment of an optical fiber attenuation length measuring device, including a linear guide rail 1, a light emitting component 4, and a photoelectric detection element 5;

[0043] The linear guide rail 1 has an opaque slide table 2 slidably mounted on it. The slide table 2 has at least one through hole 20, the axis of which is parallel to the guiding direction of the linear guide rail 1. At least two fiber optic support members 3 are spaced apart along the guiding direction of the linear guide rail 1, and the slide table 2 is located between the two fiber optic support members 3. The slide table 2 has light-transmitting holes 21 that correspond one-to-one with the through holes 20.

[0044] The light emitting component 4 is used to emit light through each of the light-transmitting holes 21 into the through hole 20;

[0045] The photoelectric detection element 5 is used to collect light intensity.

[0046] In this embodiment, the attenuation length of the optical fiber reflects the light attenuation characteristics during light transmission within it, and is defined as the length that the light intensity of the light source travels to reduce to 1 / e. Specifically, the light emitted by the light emitting component 4 enters the optical fiber 8 from a point on its side. The incident light undergoes wavelength conversion and transmission within the optical fiber 8, and finally exits from the end of the optical fiber 8, where it is collected by the photodetector 5. The attenuation length of the optical fiber 8 can be measured based on the change in the emitted light intensity (i.e., the light intensity of the emitted light) with the light incident point.

[0047] The linear guide rail is arranged along the length of the optical fiber 8, and at least one through hole 20 is arranged at intervals along the width of the slide 2, such that the axis of the through hole 20 is parallel to the length of the optical fiber 8. During measurement, at least one optical fiber 8 to be measured is respectively inserted into the through hole 20. The outer diameter of the optical fiber 8 is smaller than the aperture of the through hole 20, and the length of the optical fiber 8 is much larger than the size of the slide 2. When the optical fiber 8 is inserted into the through hole 20, the two ends of the optical fiber 8 are exposed outside the slide 2, and the slide 2 can slide freely along the length of the optical fiber 8.

[0048] The fiber support 3 is used to support and fix the fiber 8, so as to prevent the fiber 8 from moving when the slide table 2 slides freely along the length of the fiber 8, thus affecting the measurement.

[0049] The upper surface of the slide 2 is provided with light-transmitting holes 21 that correspond one-to-one with the plurality of through holes 20. The light emitting component 4 emits light through each of the light-transmitting holes 21 into each of the through holes 20, thereby illuminating the side of the optical fiber 8 to be measured by the light emitting component 4. In this method, the extension direction of the light-transmitting hole 21 on the slide 2 is perpendicular to the axis of the through hole 20.

[0050] In some preferred embodiments, the distribution positions of the plurality of light-transmitting holes 21 that correspond one-to-one with the through holes 20 on the upper surface of the slide table 2 can be the same or different. That is, the plurality of light-transmitting holes 21 can be on the same straight line extending along the width direction of the slide table 2, or they can be not on the same straight line and are staggered. When the distribution positions of the plurality of light-transmitting holes 21 are the same, the light emitted by the light emitting component 4 can be emitted simultaneously to the same position of its corresponding through hole 20. When the distribution positions of the plurality of light-transmitting holes 21 are different, the light emitted by the light emitting component 4 is emitted to different positions of its corresponding through hole 20, that is, the light is incident on the same or different positions of the plurality of optical fibers 8.

[0051] The light emitting component 4 is mounted on the slide table 2. When the slide table 2 moves freely along the linear guide rail 1, the light emitting component 4 moves freely along the length of the optical fiber 8, thereby enabling illumination at different points or positions on the optical fiber 8 and achieving automated adjustment of the light source's illumination at different positions on the optical fiber 8. In this embodiment, the slide table 2 not only drives the light emitting component 4 to move freely along the length of the optical fiber 8, but also allows multiple optical fibers 8 to be evenly spaced along the width of the slide table 2 through the through holes 20, preventing multiple optical fibers 8 from leaning against each other and affecting batch measurements. The slide table 2 is made of an opaque material, which includes both metals and non-metals, such as black POM (polyoxymethylene resin).

[0052] The photoelectric detection element 5 is connected to one end of the optical fiber 8, specifically to the output end 80 of the optical fiber 8, and is used to collect the light signal output from the output end 80 of the optical fiber 8, i.e., to collect the illumination intensity of the light emitted from the output end 80 of the optical fiber 8. In this method, when multiple optical fibers 8 are passed through the through hole 20 along the linear guide rail 1, each output end 80 of the multiple optical fibers 8 is connected to a corresponding photoelectric detection element 5, thereby realizing the batch measurement of the attenuation length of multiple optical fibers 8 and significantly improving the measurement efficiency. The photoelectric detection element 5 includes, but is not limited to, a photomultiplier tube (PMT), a photodiode (PD), or a silicon photomultiplier tube (SiPM).

[0053] Furthermore, in some preferred embodiments of this application, the light emitting component 4 includes a light source 40 and a beam splitter 41. The beam splitter 41 is used to decompose the light emitted by the light source 40 to generate multiple sub-beams with the same illumination intensity, which respectively illuminate multiple optical fibers 8 to be tested.

[0054] In this embodiment, the beam emitted by the light source 40 is split into multiple sub-beams of equal intensity by the beam splitter 41. The number of sub-beams is determined based on the maximum number of optical fibers 8 that can pass through the through-holes 20 of the slide stage 2, ensuring that the beam emitted by the light source 40 can simultaneously illuminate multiple optical fibers 8. This method, by utilizing the beam splitter 41, allows the light emitting component 4 to include only one light source 40, eliminating the need for multiple light sources corresponding to multiple optical fibers 8, effectively reducing the cost and assembly complexity of the measurement system of this application. Preferably, the beam splitter 41 is a Y-type glass fiber beam splitter, which has multiple output branches to generate multiple sub-beams.

[0055] In this embodiment, the light source 40 is an LED light source with a center wavelength of 400-450nm, which can emit blue-violet light of the corresponding wavelength. Preferably, the light source 40 is an LED light source with a center wavelength of 420nm.

[0056] Furthermore, in some preferred embodiments of this application, the light source emitting component 4 further includes a beam expander 42 for expanding the sub-beam output by the beam splitter 41. The beam expander 42 is disposed at the opening of the light-transmitting hole 21. The light from the light source 40 passes through the beam splitter 41, the beam expander 42 and the light-transmitting hole 21 in sequence before exiting into the through hole 20.

[0057] In this embodiment, the beam expander 42 is used to adjust the diameter of the sub-beam output by the beam splitter 41, expanding the sub-beam to match the outer diameter of the optical fiber 8, while reducing the emission angle of the sub-beam. The expanded sub-beam forms a linear parallel light of a set diameter, so that it uniformly illuminates the optical fiber 8.

[0058] More specifically, the beam expander 42 is positioned at the opening of the light-transmitting aperture 21, and the beam splitter 41 has a total input port and multiple output branches, each output branch corresponding to an output core. Each output core is located directly above the multiple beam expanders 42 that correspond to it. The light source 40 is connected to the total input port of the beam splitter. The beam emitted by the light source 40 is split into multiple sub-beams by the beam splitter 41. The multiple sub-beams pass through the beam expander 42 and the light-transmitting aperture 21 in sequence and are then incident on the optical fiber 8 that passes through the through hole 20. Preferably, the diameter of the light-transmitting aperture 21 matches the outer diameter of the optical fiber 6.

[0059] Furthermore, in some preferred embodiments of this application, the optical fiber support 3 has at least one support area for supporting the optical fiber, and the support area is coaxially arranged in a one-to-one correspondence with the through hole 20.

[0060] In this embodiment, the coaxial arrangement of the support area of ​​the fiber optic support 3 with the through hole 20 means that the horizontal plane of the through hole 20 and the horizontal plane of the support area of ​​the fiber optic support 3 are on the same straight line. The support area refers to the area of ​​the fiber optic support 3 used to contact and clamp the fiber optic 8. When the fiber optic 8 to be measured is inserted into the through hole 20 of the slide table 2, the portions of the fiber optic 8 near its two ends are fixed by the fiber optic support 3. By coaxially arranging the support area of ​​the fiber optic support 3 with the through hole 20, the fiber optic 8 can extend parallel to the linear guide rail 1, facilitating the parallel movement of the slide table 2 along the length of the fiber optic 8 and ensuring effective measurement. The fiber optic support 3 can be a magnetic clamp, a buckle, etc. The fiber optic support 3 can be installed on the linear guide rail 1 in an appropriate manner, such as by a bracket, or installed on both sides of the linear guide rail 1, so that the fiber optic 8 can be fixed on the linear guide rail 1 along the guiding direction of the linear guide rail 1.

[0061] Furthermore, in some preferred embodiments of this application, the fiber optic attenuation length measuring device further includes a drive device 6 connected to the slide 2 for driving the slide 2 to reciprocate along the linear guide rail 1. The drive device 6 can be a servo motor or a cylinder, etc., to drive the slide 2 to move.

[0062] Furthermore, in some preferred embodiments of this application, the linear guide rail 1, the light emitting component 4, the photoelectric detection element 5, and the driving device 6 are all disposed in the dark box 7.

[0063] In this embodiment, the dark box 7 is made of an opaque material to prevent external light from entering the optical fiber and affecting the measurement results. The opaque material includes both metal and non-metal materials.

[0064] Furthermore, in some preferred embodiments of this application, the optical fiber 8 is a wave-shifting optical fiber; the optical fiber 8 has two corresponding end faces, one end face serving as the output end 80 connected to the photoelectric detection element 5, and the other end face 81 being blackened.

[0065] In this embodiment, the two end faces of the optical fiber 8 are located at its two ends, one of which is its emitting end 80, which can be coupled to the detection surface of the photodetector element 5 via a fixing device. Alternatively, coupling methods such as coupling chemicals or air coupling can be used to couple the emitting end 80 of the optical fiber 8 to the photodetector element 5. To facilitate the replacement of the optical fiber 8, a fixing device is preferred for coupling; the fixing device can be a clamp, clip, etc. In this embodiment, the other end face 81 of the optical fiber 8 is coated with a dark paint. The dark paint used is required to absorb photons emitted from this end face 81, preventing photons from being reflected from this end face 81 and affecting the measurement results.

[0066] For example, in a preferred embodiment of this application, the slide 2 has eight evenly spaced through holes 21, and eight optical fibers 8 are respectively inserted into the through holes 21. One end of each optical fiber 8 is placed freely, and its end face 81 is blackened. The other end of each optical fiber 8 is connected to a photoelectric detection element 5. The light emitting component 4 consists of an LED light source with a center wavelength of 420nm, a 1-to-8 Y-type glass fiber beam splitter, and a beam expander, so that the measurement system of this embodiment can simultaneously measure the attenuation length of the eight optical fibers 8.

[0067] According to the second aspect of this application, please refer to Figure 2 This application illustrates a preferred embodiment of an optical fiber attenuation length measurement system, including an optical fiber attenuation length measurement device and an analysis and processing unit 9 as described above. The analysis and processing unit 9 is used to determine the attenuation length of the optical fiber 8 based on the light intensity collected by the photoelectric detection element 5 when the light emitting component 4 is located at different positions.

[0068] In this embodiment, the photoelectric detection element 5 can collect optical signals and convert them into electrical signals. The analysis and processing unit 9 is used to collect and store the electrical signals output by the photoelectric detection element 5, and calculate the attenuation length of the optical fiber 8 under test based on the electrical signals and output the results.

[0069] Furthermore, in some preferred embodiments of this application, the fiber optic attenuation length measurement system further includes an analog-to-digital conversion unit 10, which comprises:

[0070] A digital converter, connected to the output terminal of the photoelectric detection element 5, is used to acquire the electrical signal output by the photoelectric detection element 5 and output a digital signal corresponding to the electrical signal; and

[0071] The switch is connected to the output of the digital converter and is used to receive the digital signals output by the digital converter, summarize them, and output them to the analysis and processing unit 9.

[0072] In this embodiment, the analog-to-digital conversion unit 10 is mainly used to collect, digitize, and summarize the electrical signals output by the photoelectric detection element 5. The switch can be an Ethernet switch, which is connected to the analysis and processing unit 9 via Ethernet to summarize the signals output by the output ends 80 of multiple optical fibers 8 and output them to the analysis and processing unit 9 for analysis and processing.

[0073] Furthermore, in some preferred embodiments of this application, the fiber optic attenuation length measurement system further includes a pulse signal generation unit 11, which includes a pulse signal generator capable of outputting two drive signals. One drive signal is used to drive the light source 40 to emit light and control its illumination intensity, and the other drive signal is used to trigger the analog-to-digital conversion unit 10.

[0074] In this embodiment, the pulse signal generating unit 11 is connected to the light emitting component 4 and the analog-to-digital conversion unit 10 respectively. Its two driving signals are output through two channels, one of which is a logic signal used as the driving control signal of the light source 40, and the other is a logic signal used as the trigger signal of the analog-to-digital conversion unit 10. The pulse width of the pulse signal generator of the pulse signal generating unit 11 is preferably 40ns, and the repetition frequency is preferably 10kHz.

[0075] Furthermore, in some preferred embodiments of this application, the analysis and processing unit 9 includes:

[0076] A drive and control module is used to control the slide table 2 to reciprocate along the linear guide rail 1 via the driver 12;

[0077] The data acquisition module is used to control the start and stop of the analog-to-digital conversion unit 10 and to receive the digital signals output by the switch after aggregation.

[0078] The data processing module is used to calculate the attenuation length of the optical fiber 8 based on the digital signal;

[0079] The display module is used to display the calculation results.

[0080] In this embodiment, the drive and control module sends instructions to the driver 12 via the serial port as needed, and the driver 12 controls the drive device 6 to realize the translation and stopping of the slide table 2.

[0081] During measurement, the slide 2 first moves to the first position of the optical fiber 8. The pulse signal generating unit 11 drives the light source 40 to emit light and sends a trigger signal to the analog-to-digital conversion unit 10. The light beam emitted by the light source 40 illuminates the optical fiber 8 at the first position of the optical fiber 8. The light signal output by the output end 80 of the optical fiber 8 is collected by the photoelectric detection element 5 and converted into an electrical signal. The electrical signal is collected by the analog-to-digital conversion unit 10 and converted into a digital signal. The data acquisition module collects the digital signal of the analog-to-digital conversion unit 10, and after format conversion, it is stored in the analysis and processing unit 9, thus completing the acquisition of one data point.

[0082] After the first point measurement of fiber 8 is completed, the slide 2 is driven by the drive device 6 under the control of the driver 12 to move a certain distance along the length of fiber 8 to the second point of fiber 8. The above steps are repeated, and the measurement result of the second point of fiber 8 is stored in the analysis and processing unit 9, that is, the acquisition of two data points is completed.

[0083] This process continues until the measurements of n optical fiber points are completed, that is, after obtaining a sufficient number of data points, the data processing module plots a curve based on the multiple data points stored in the analysis and processing unit 9, using the following formula, where n≥2;

[0084] I=I0 exp(-x / λ) formula (1);

[0085] Wherein, I is the light intensity obtained when light irradiates the optical fiber at a certain position, I0 is the initial light intensity, x is the relative distance between the light irradiation position and the photoelectric detection element 5 when light irradiates the optical fiber at a certain position, and λ is the attenuation length; where the initial light intensity is the initial light intensity of the light source 40, the relative distance between the light irradiation position and the photoelectric detection element 5 is the distance between the light irradiation position and the output end 80 of the optical fiber 8, and the light irradiation position refers to the incident point of the sub-beam output by the beam splitter 41 on the optical fiber 8.

[0086] The slope of the curve is obtained based on linear fitting, which is the attenuation length of the optical fiber 8. The data processing module also includes a step of removing outlier data points before performing linear fitting on the curve.

[0087] Furthermore, the display module displays the above data points and curves in real time in the form of charts, and displays the calculation results of the attenuation length;

[0088] Furthermore, the calculation results are stored in the analysis and processing unit 9 for later retrieval.

[0089] The number of optical fiber 8 sites to be measured and the distance between two adjacent sites can be set on the display interface of the analysis and processing unit. After the measurement is completed, the slide 2 automatically returns to the initial position to facilitate the next measurement.

[0090] The analysis and processing unit 9 of this embodiment can be pre-implemented in the electronic device or loaded into the electronic device by downloading or other means. The corresponding modules in the analysis and processing unit 9 of this embodiment can cooperate with the units in the electronic device to implement the solution of this application embodiment. Furthermore, the modules described in this embodiment can be implemented in software or hardware. The names of these units or modules do not necessarily constitute a limitation on the unit or module itself.

[0091] The analysis and processing unit 9 of this embodiment can be included in a computer system, which includes a central processing unit (CPU) that can perform various appropriate actions and processes based on programs stored in read-only memory (ROM) or programs loaded from storage into random access memory (RAM). The RAM also stores various programs and data required for the operation of the computer system. The CPU, ROM, and RAM are interconnected via a bus. An input / output (I / O) interface is also connected to the bus. The following components are connected to the I / O interface: an input section including a keyboard, mouse, etc.; an output section including cathode ray tube (CRT), liquid crystal display (LCD), etc., and speakers, etc.; a storage section including a hard disk, etc.; and a communication section including a network interface card such as a LAN card, modem, etc. The communication section performs communication processing via a network such as the Internet.

[0092] Furthermore, in some preferred embodiments of this application, the fiber optic attenuation length measurement system further includes a power supply 13 for powering the photoelectric detection element 5 and the analog-to-digital conversion unit 10.

[0093] In this application, in order to obtain the relationship between the light output of the optical fiber 8 and the positional change of the light irradiation position from the output end 80 of the optical fiber 8 (or the distance of the light irradiation position from the photodetector 5) when the light irradiates the optical fiber 8 at different positions, it is preferable that the light emitting component 4 moves from the free end of the optical fiber 8 toward the photodetector 5.

[0094] In addition, the measurement system of this application can also be used to check whether there is damage and defects on the surface of the optical fiber. Specifically, if a certain data point on the curve displayed in real time by the display module in the form of a chart shows a large deviation or fluctuation compared with other data points, it indicates that there is damage or defects at the irradiated site of the optical fiber corresponding to the data point, resulting in obvious fluctuations in light output.

[0095] Please refer to Figure 3 This paper illustrates a preferred embodiment of a fiber optic attenuation length measurement method, which is performed using the measurement system described above and includes the following steps:

[0096] Step S10: Irradiate the optical fiber passing through the through hole with light of a specific intensity;

[0097] Step S20: Change the position of the light beam on the optical fiber at least once;

[0098] Step S30: Calculate the attenuation length of the optical fiber based on the light intensity obtained from at least two illuminations.

[0099] In step S10, the light emitting component 4 emits a light beam, which illuminates the optical fiber 8 at the first point of the optical fiber 8; the photoelectric detection element 5 collects the light signal output from the emitting end 80 of the optical fiber 8 and converts it into an electrical signal; the analysis and processing unit 9 collects and stores the electrical signal output by the photoelectric detection element 5, and completes the acquisition of the first data point.

[0100] In step S20, the light emitting component 4 moves freely along the length of the optical fiber 8 with the slide 2 to the second position of the optical fiber 8, and the light emitting component 4 emits a light beam to illuminate the optical fiber 8 at the second position; the photoelectric detection element 5 collects the light signal output from the emitting end 80 of the optical fiber 8 and converts it into an electrical signal; the analysis and processing unit 9 collects and stores the electrical signal output by the photoelectric detection element 5 to complete the acquisition of the second data point.

[0101] In step S30, the analysis and processing unit 9, based on at least the two data points mentioned above, plots a graph showing the relationship between the optical signal output of the light emitting component 4 irradiating different points on the optical fiber 8 and the distance between the irradiated position and the emitting end 80 of the optical fiber 8, according to the following formula:

[0102] I=I0 exp(-x / λ) formula (1);

[0103] Where I is the light intensity obtained when the light irradiates the optical fiber at a certain position, I0 is the initial light intensity, x is the relative distance between the light irradiation position and the photoelectric detection element 5 when the light irradiates the optical fiber at a certain position, and λ is the attenuation length.

[0104] The slope of the curve is obtained by linear fitting, which is the attenuation length of fiber 6.

[0105] Furthermore, in some preferred embodiments of this application, the optical fiber 8 is a wave-shifting optical fiber; the optical fiber 8 has two corresponding end faces, one end face serving as the output end 80 connected to the photoelectric detection element 5, and the other end face 81 being blackened to ensure the accuracy of the measurement results.

[0106] Please refer to Figure 4 The diagram shows the calculation results interface when performing batch measurement of the attenuation length of multiple optical fibers using the optical fiber attenuation length measurement system of this application. It can be seen that the measurement system of this application can realize automated data acquisition and analysis, and realize the visualization display of measurement results.

[0107] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. An optical fiber attenuation length measuring apparatus characterized by, The application relates to a device for measuring the attenuation length of an optical fiber, comprising: a linear guide rail, on which a lightproof sliding table is arranged to slide, the sliding table is provided with at least one through hole, and the axis of the through hole is parallel to the guiding direction of the linear guide rail; at least two optical fiber supporting members are arranged along the guiding direction of the linear guide rail and are spaced apart, and the sliding table is located between the two optical fiber supporting members; the sliding table is provided with light transmission holes which are in one-to-one correspondence with the through holes; a light emitting component is arranged to emit light through the light transmission holes to the through holes; and a photoelectric detection element is arranged to collect light intensity. The multiple light transmission holes are arranged on the same straight line along the width direction of the sliding table, or are staggered and distributed. When the multiple light transmission holes are arranged at the same position, the light emitted by the light emitting component can be emitted to the same position of the through hole corresponding to the light transmission hole. The light emitting component comprises a light source and a beam splitter. The beam splitter is used for splitting the light emitted by the light source to generate multiple sub-beams with the same light intensity. The light emitting component further comprises a beam expander mirror used for expanding the sub-beams output by the beam splitter.

2. The optical fiber attenuation length measurement apparatus of claim 1, wherein, The beam expander mirror is arranged at the aperture of the light transmission hole, and the light from the light source is sequentially emitted to the through hole through the beam splitter, the beam expander mirror and the light transmission hole.

3. The optical fiber attenuation length measurement apparatus of claim 2, wherein, The optical fiber supporting member has at least one supporting area for supporting an optical fiber, and the supporting area is coaxially arranged with the through hole.

4. The optical fiber attenuation length measurement apparatus of claim 1, wherein, The device further comprises a driving device used for driving the sliding table to reciprocate along the linear guide rail.

5. The fiber attenuation length measurement apparatus of claim 1, wherein, The linear guide rail, the light emitting component, the photoelectric detection element and the driving device are arranged in a dark box.

6. The optical fiber attenuation length measurement apparatus of claim 5, wherein, The device further comprises an analysis processing unit used for determining the attenuation length of the optical fiber according to the light intensity collected by the photoelectric detection element when the light emitting component is arranged at different positions.

7. An optical fiber attenuation length measurement system characterized by, The device is used for measuring the attenuation length of an optical fiber, and the measurement comprises the following steps:

8. A method of measuring the attenuation length of an optical fiber, characterized by, Irradiating the optical fiber arranged in the through hole with light with a specific light intensity; Changing the irradiation position of the light on the optical fiber at least once; Calculating the attenuation length of the optical fiber according to the light intensity obtained through the at least two irradiations. The attenuation length of the optical fiber is calculated according to the following formula:

9. The method of claim 8, wherein, The slope of the curve drawn according to the above formula is obtained based on linear fitting, and the attenuation length of the optical fiber is obtained. I = I 0exp(- x / The optical fiber is a wave shift optical fiber. ); wherein I I0is the initial light intensity of the light rays, I 0is the initial light intensity of the light rays, x is the relative distance between the position of the light rays impinging on the optical fiber and the photodetector element when the light rays impinge on the optical fiber at a certain position of the optical fiber, The optical fiber has two corresponding end faces, one of which is connected to the photoelectric detection element as an emitting end, and the other end face is blackened. is the attenuation length; ​ 10. The optical fiber attenuation length measurement method according to claim 8 or 9, characterized in that, ​ ​

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