A measuring ruler for externally cut optical fiber bending radius and a measuring method thereof

Abstract

A measuring ruler for the bending radius of an externally cut optical fiber and a measuring method thereof, comprising a circular ruler with a scale, a fixed ruler plate and a movable ruler plate, wherein a rotating shaft is fixedly installed in the middle of the circular ruler, and an optical fiber limiting groove is formed on the side wall of the rotating shaft, a fixed ruler plate is fixedly mounted on the rotating shaft, and a movable ruler plate is rotatably mounted on the rotating shaft; U-shaped cards for positioning optical fibers are fixedly installed at the free ends of the fixed ruler plate and the movable ruler plate, and the circular ruler is penetrated and installed in the middle of the fixed ruler plate and the movable ruler plate. The error caused by the traditional measurement method in the process of finding the center of a circle is avoided, the structure is simple, and the measurement of the outer side of the optical fiber is conducive to single-person operation in a narrow working space, and it has the advantages of high measurement accuracy, easy use and a wide measurement range.

Description

Technical Field

[0001] The invention relates to the technical field of measuring equipment, and in particular to an externally cut optical fiber bending radius measuring ruler and a measuring method thereof. Background Art

[0002] One of the most important advantages of optical fiber is its flexibility. If the curvature radius of the optical fiber is too small, the propagation path of light will change, causing the light to penetrate from the core to the cladding, and may even penetrate through the cladding to the outside, resulting in a loss of beam power, which in turn affects the communication quality. On the other hand, due to the actual installation conditions on site (including the design requirements of the installation space, the distance to the heating element, etc.), the optical fiber installation radius cannot be too large, so it is necessary to effectively measure and control the length of the radius during the installation of the optical fiber. The current test method relies on experience and visual inspection, and it is impossible to accurately obtain the bending radius of the optical fiber. Therefore, a device that can quickly measure the bending radius of the optical fiber is needed.

[0003] After searching the published patents, no highly relevant published patents were found. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide an externally cut optical fiber bending radius measuring ruler and a measuring method thereof, which can accurately measure the circular arc bending radius of the optical fiber, and effectively solve the problem of poor accuracy of visual measurement based on experience in the prior art.

[0005] A tangential optical fiber bending radius measuring ruler comprises a ring ruler with a scale, a fixed ruler plate and a movable ruler plate, wherein a rotating shaft is fixedly mounted in the middle of the ring ruler, a side wall of the rotating shaft is provided with an optical fiber limiting groove, the fixed ruler plate is fixedly mounted on the rotating shaft, and the movable ruler plate is rotatably mounted on the rotating shaft; U-shaped cards for positioning optical fibers are fixedly mounted at the free ends of the fixed ruler plate and the movable ruler plate, and the ring ruler is penetrated and installed in the middle of the fixed ruler plate and the movable ruler plate.

[0006] Moreover, one end of the fixed scale plate and the movable scale plate is uniformly formed with a U-shaped connecting arm, and the inside of the U-shaped connecting arm penetrates and installs a ring scale; the U-shaped connecting arm at the end of the fixed scale plate is fixedly connected to the rotating shaft, and the U-shaped connecting arm at the end of the movable scale plate is rotationally connected to the rotating shaft.

[0007] Moreover, the annular ruler comprises an annular ruler plate and a plurality of fan-shaped connecting pieces, wherein the outer circles of the fan-shaped connecting pieces are fixedly connected to the inner wall of the annular ruler plate, and the inner circles of the fan-shaped connecting pieces are fixedly connected to the rotating shaft.

[0008] A method for measuring an externally cut optical fiber bending radius measuring ruler comprises the following steps:

[0009] Step 1: Fix the middle part of the optical fiber in the optical fiber limit groove of the rotating shaft, and then insert the two ends of the optical fiber into the U-shaped clamps on the fixed scale plate and the free end of the movable scale plate. At this time, the fixed scale plate should be in line with the movable scale plate;

[0010] Step 2: record the marking points at both ends of the optical fiber, and read the scale degrees of the two marking points located on the fixed scale plate and the movable scale plate respectively;

[0011] Step 3: Hold the fixed scale plate and the movable scale plate and gradually bend the optical fiber until the optical fiber cannot be bent any further. At this time, read the scale degrees of the two marking points on the fixed scale plate and the movable scale plate respectively, and read the angle degree on the annular scale plate;

[0012] Step 4: Calculate the displacement difference x of the optical fiber marking point on the fixed scale plate and the movable scale plate through steps 2 and 3, and calculate the bending radius of the optical fiber using the formula r = x·tanα;

[0013] Moreover, in the formula r=x·tanα of step four, r is the bending radius of the optical fiber, a is half of the angle degree on the annular scale plate, and x is the displacement of the marking points at both ends of the optical fiber in the straight state and the bent state of the optical fiber.

[0014] Moreover, after step 4 is completed, an error judgment should be performed. Suppose the displacement of the optical fiber marking point on the fixed scale is x1, and the displacement of the optical fiber marking point on the movable scale is x2. If x1=x2, the measurement is determined to be accurate. Otherwise, loosen the fitting force between the U-shaped card and the outer wall of the optical fiber and repeat steps 2 to 4.

[0015] The advantages and technical effects of the present invention are:

[0016] The present invention discloses an externally cut optical fiber bending radius measuring ruler and a measuring method thereof. The two ends of an optical fiber are respectively limited by U-shaped clips on a fixed ruler plate and a movable ruler plate, and a limiting support (i.e., a bending fulcrum) is provided in the middle of the optical fiber by a fiber limiting groove of a rotating shaft. The displacement x of the optical fiber marking point is read by the linear scales on the fixed ruler plate and the movable ruler plate, and the angle a between the fixed ruler plate and the movable ruler plate is read by the circular scale on the annular ruler plate. Finally, the optical fiber bending radius r is calculated by the formula r=x·tanα.

[0017] The invention discloses an externally cut optical fiber bending radius measuring ruler and a measuring method thereof, which fills the blank of optical fiber bending radius measurement. The ruler measures the scale readings on a fixed ruler plate, a movable ruler plate and a ring ruler and calculates by formula, and adopts a method of measuring the tangent length and the tangent angle to calculate the bending radius of the arc, thereby avoiding the error caused by the traditional measurement method in the process of finding the center of the circle. The ruler has a simple structure and the measurement of the outer side of the optical fiber is conducive to single-person operation in a small working space. The ruler has the advantages of high measurement accuracy, easy use and a wide measurement range. The ruler is a highly creative externally cut optical fiber bending radius measuring ruler and a measuring method thereof. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A top view of the present invention;

[0019] Figure 2 It is a side view (partial cutaway view) of the present invention;

[0020] Figure 3 It is a schematic diagram of the U-shaped card structure of the present invention;

[0021] Figure 4 It is the measurement principle diagram of the present invention;

[0022] In the figure: 1-fixed ruler; 2-ring ruler; 3-rotating shaft; 4-fan-shaped connecting piece; 5-movable ruler; 6-U-shaped card; 7-U-shaped connecting arm; 8-optical fiber limiting groove. DETAILED DESCRIPTION

[0023] In order to further understand the content, features and effects of the present invention, the following embodiments are given as examples and described in detail with reference to the accompanying drawings. It should be noted that the embodiments are illustrative, not restrictive, and the protection scope of the present invention cannot be limited thereby.

[0024] A tangential optical fiber bending radius measuring ruler comprises a circular ruler 2 with a scale, a fixed ruler plate 1 and a movable ruler plate 5, wherein a rotating shaft 3 is fixedly mounted in the middle of the circular ruler, and an optical fiber limiting groove 8 is formed on the side wall of the rotating shaft, the fixed ruler plate is fixedly mounted on the rotating shaft, and the movable ruler plate is rotatably mounted on the rotating shaft; U-shaped cards 6 for positioning optical fibers are fixedly mounted at the free ends of the fixed ruler plate and the movable ruler plate, and the circular ruler is penetrated and installed in the middle of the fixed ruler plate and the movable ruler plate.

[0025] Moreover, one end of the fixed scale plate and the movable scale plate is uniformly formed with a U-shaped connecting arm 7, and the inside of the U-shaped connecting arm penetrates and installs a ring ruler; the U-shaped connecting arm at the end of the fixed scale plate is fixedly connected to the rotating shaft, and the U-shaped connecting arm at the end of the movable scale plate is rotatably connected to the rotating shaft.

[0026] Moreover, the annular ruler comprises an annular ruler plate and a plurality of fan-shaped connecting pieces 4, wherein the outer circles of the fan-shaped connecting pieces are fixedly connected to the inner wall of the annular ruler plate, and the inner circles of the fan-shaped connecting pieces are fixedly connected to the rotating shaft.

[0027] A method for measuring an externally cut optical fiber bending radius measuring ruler comprises the following steps:

[0028] Step 1: Fix the middle part of the optical fiber in the optical fiber limit groove of the rotating shaft, and then insert the two ends of the optical fiber into the U-shaped clamps on the fixed scale plate and the free end of the movable scale plate. At this time, the fixed scale plate should be in line with the movable scale plate;

[0029] Step 2: record the marking points at both ends of the optical fiber, and read the scale degrees of the two marking points located on the fixed scale plate and the movable scale plate respectively;

[0030] Step 3: Hold the fixed scale plate and the movable scale plate and gradually bend the optical fiber until the optical fiber cannot be bent any further. At this time, read the scale degrees of the two marking points on the fixed scale plate and the movable scale plate respectively, and read the angle degree on the annular scale plate;

[0031] Step 4: Calculate the displacement difference x of the optical fiber marking point on the fixed scale plate and the movable scale plate through steps 2 and 3, and calculate the bending radius of the optical fiber using the formula r = x·tanα;

[0032] Moreover, in the formula r=x·tanα of step four, r is the bending radius of the optical fiber, a is half of the angle degree on the annular scale plate, and x is the displacement of the marking points at both ends of the optical fiber in the straight state and the bent state of the optical fiber.

[0033] Moreover, after step 4 is completed, an error judgment should be performed. Suppose the displacement of the optical fiber marking point on the fixed scale is x1, and the displacement of the optical fiber marking point on the movable scale is x2. If x1=x2, the measurement is determined to be accurate. Otherwise, loosen the fitting force between the U-shaped card and the outer wall of the optical fiber and repeat steps 2 to 4.

[0034] In addition, in the present invention, preferably, the U-shaped connecting arm of the fixed scale plate is fixedly mounted on the rotating shaft, and the U-shaped connecting arm of the movable scale plate is rotatably mounted on the rotating shaft, and this connection method adopts a mature means in the prior art.

[0035] In addition, in the present invention, preferably, the U-shaped card is made of a flexible and plastic material, the clamping force between the U-shaped card and the outer wall of the optical fiber can be adjusted, and the U-shaped card adopts a mature product in the prior art.

[0036] To more clearly illustrate the specific implementation of the present invention, an example is provided below:

[0037] External fiber bending radius measuring ruler, such as Figure 1As shown, it consists of an angle measuring ruler (circular ruler) and a length measuring ruler (fixed ruler plate and movable ruler plate). The fixed ruler plate is placed at the 0 degree angle of the angle measuring ruler, and the length measuring ruler is hinged to the angle measuring ruler through a rotating shaft, and moves in a circle with the rotating shaft as the center of the circle close to the angle measuring ruler. The length measuring ruler measures the tangent length, and the angle measuring ruler measures the tangent angle.

[0038] Combine the following Figure 4 , illustrating the measurement principle of the present invention. In Euclidean geometry, two tangent lines are drawn from a point outside a circle, the two tangent lines are of equal length, and the line connecting the point and the center of the circle bisects the angle between the two tangent lines. Figure 2 In the equation, assuming that the angle between the two tangents is 2a and the length of the tangent is x, the bending radius satisfies: r = x·tanα.

[0039] In field use, the present invention is fastened to the outer edge of a bent optical fiber, and the angle measuring ruler and the length measuring ruler readings are read respectively. The bending radius of the optical fiber can be obtained by simple calculation through the above formula. The measuring method is simple and has a wide measuring range.

[0040] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should fall within the scope of protection of the appended claims of the present invention.

Claims

1. A tangential optical fiber bending radius measuring ruler, characterized in that: It comprises a circular ruler with scales, a fixed ruler plate and a movable ruler plate, wherein a rotating shaft is fixedly installed in the middle of the circular ruler, and an optical fiber limiting groove is formed on the side wall of the rotating shaft, the fixed ruler plate is fixedly mounted on the rotating shaft, and the movable ruler plate is rotatably mounted on the rotating shaft; the free ends of the fixed ruler plate and the movable ruler plate are fixedly installed with U-shaped cards for positioning optical fibers, and the middle parts of the fixed ruler plate and the movable ruler plate are penetrated and installed with the circular ruler; One end of the fixed ruler plate and the movable ruler plate is uniformly formed with a U-shaped connecting arm, and a ring ruler is installed inside the U-shaped connecting arm; the U-shaped connecting arm at the end of the fixed ruler plate is fixedly connected to the rotating shaft, and the U-shaped connecting arm at the end of the movable ruler plate is rotatably connected to the rotating shaft; The annular ruler comprises an annular ruler plate and a plurality of fan-shaped connecting pieces, wherein the outer circles of the fan-shaped connecting pieces are fixedly connected to the inner wall of the annular ruler plate, and the inner circles of the fan-shaped connecting pieces are fixedly connected to the rotating shaft; The measuring method of the circumscribed optical fiber bending radius measuring ruler comprises the following steps: Step 1: Fix the middle part of the optical fiber in the optical fiber limit groove of the rotating shaft, and then insert the two ends of the optical fiber into the U-shaped clamps on the fixed scale plate and the free end of the movable scale plate. At this time, the fixed scale plate should be in line with the movable scale plate; Step 2: record the marking points at both ends of the optical fiber, and read the scale degrees of the two marking points located on the fixed scale plate and the movable scale plate respectively; Step 3: Hold the fixed scale plate and the movable scale plate and gradually bend the optical fiber until the optical fiber cannot be bent any further. At this time, read the scale degrees of the two marking points on the fixed scale plate and the movable scale plate respectively, and read the angle degree on the annular scale plate; Step 4: Calculate the displacement difference x of the optical fiber marking point on the fixed scale plate and the movable scale plate through steps 2 and 3, and calculate the bending radius of the optical fiber using the formula r = x·tanα; In the formula r=x·tanα of step 4, r is the bending radius of the optical fiber, a is half of the angle on the annular ruler, and x is the displacement of the marking points at both ends of the optical fiber in the straight state and the bent state of the optical fiber; After the completion of step 4, an error judgment should also be performed. Suppose the displacement of the optical fiber marking point on the fixed scale is x1, and the displacement of the optical fiber marking point on the movable scale is x2. If x1=x2, the measurement is determined to be accurate. Otherwise, loosen the fitting force between the U-shaped card and the outer wall of the optical fiber and repeat steps 2 to 4.

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