A preform analyzer

Abstract

The present invention provides a preform rod analyzer, including a preform rod clamping device, a detector, a laser device, a transparent window, an oil tank and a salvage piece, wherein the preform rod clamping device includes a chuck, and the chuck is located above the transparent window, the detector and the laser device are correspondingly arranged on both sides of the transparent window, the lower end of the transparent window is fixedly connected with an oil tank, and the oil tank is filled with test oil, and the salvage piece is arranged in the oil tank so as to be movable up and down. The preform rod analyzer of the present invention has a simple structure, can quickly detect preform rods, improves detection efficiency, and reduces labor costs. In addition, the preform rod analyzer is provided with a salvage piece, which can effectively protect the preform rod and the preform rod analyzer. If the preform rod accidentally falls, the preform rod can be conveniently and quickly taken out without disassembling the oil tank and extracting the test oil, thereby reducing the pollution of the test oil and saving costs.

Description

Technical Field

[0001] The invention relates to the technical field of optical testing instruments, and in particular to a preform rod analyzer. Background Art

[0002] The refractive index distribution and geometric dimensions of the optical fiber preform have a great influence on the optical performance of the optical fiber cable. Therefore, the refractive index distribution and geometric parameters of each part of the preform must be strictly controlled during the production process of the preform.

[0003] The testing of optical fiber preform is a powerful intermediate testing method in the optical fiber manufacturing process, which can greatly control the quality of the preform and thus ensure the quality of the optical fiber, which is very necessary in large-scale production. However, the existing technology mainly performs the testing of preform manually, which takes too long, is inefficient, and has high labor costs.

[0004] Therefore, how to design a fast and accurate preform rod analyzer becomes a problem that needs to be solved urgently in the present invention. Summary of the invention

[0005] The purpose of the present invention is to provide a preform analyzer that can quickly and accurately measure the refractive index distribution and geometric dimensions of the preform, thereby greatly controlling the quality of the preform.

[0006] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a preform rod analyzer, comprising a preform rod clamping device, a detector, a laser device, a transparent window, an oil tank and a salvage piece, wherein the preform rod clamping device comprises a chuck, and the chuck is located above the transparent window, the detector and the laser device are correspondingly arranged on both sides of the transparent window, the lower end of the transparent window is fixedly connected to an oil tank, and the oil tank is filled with test oil, and the salvage piece is arranged in the oil tank so as to be movable up and down.

[0007] Furthermore, the test oil is a refractive index matching oil, and the refractive index of the refractive index matching oil is the same as or similar to the refractive index of the transparent window.

[0008] Furthermore, the height of the salvaged piece is not higher than the transparent window.

[0009] Furthermore, the top of the salvaged piece is open, and the bottom of the salvaged piece is closed.

[0010] Furthermore, the salvage piece is cylindrical.

[0011] Furthermore, the salvage piece is provided with at least one extraction port.

[0012] Furthermore, the shape of the extraction port is circular, square, arc-shaped or irregular.

[0013] Furthermore, oil drainage holes are distributed on the cylinder wall of the salvage piece.

[0014] Further, the maximum dimension of the top of the salvaged piece is greater than the maximum dimension of the bottom of the salvaged piece.

[0015] Furthermore, the maximum dimension of the bottom of the salvaged piece is smaller than the minimum dimension of the end surface of the preform.

[0016] Furthermore, a buffer piece is provided at the bottom of the salvage piece.

[0017] Furthermore, the buffer member includes an upper cover plate, a lower cover plate and a shock absorbing spring arranged between the upper cover plate and the lower cover plate.

[0018] Furthermore, it also includes a stand, the detector, the laser device, the transparent window and the preform rod clamping device are located on the stand, and the oil tank extends downward to below the stand.

[0019] Furthermore, the preform rod clamping device also includes a guide rail, and the clamping head is movably arranged on the guide rail.

[0020] Advantages of the invention:

[0021] The preform analyzer of the present invention has a simple structure, can quickly and accurately measure the refractive index distribution and geometric dimensions of the preform, improves the detection efficiency, and reduces the labor cost. In addition, the preform analyzer is provided with a salvage piece, which can effectively protect the preform and the preform analyzer. If the preform accidentally falls, the preform can be conveniently and quickly taken out without disassembling the oil tank or extracting the test oil, thereby reducing the pollution of the test oil and saving costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the preform rod analyzer of the present invention;

[0023] Figure 2 It is a schematic structural diagram of a salvage piece in one embodiment of the present invention;

[0024] Figure 3 It is a schematic structural diagram of a salvage piece in another embodiment of the present invention;

[0025] Among them, 1. guide rail, 2. chuck, 3. preform rod, 4. detector, 5. oil tank, 6. laser device, 7. transparent window, 8. salvage part, 9. buffer part. DETAILED DESCRIPTION

[0026] The following examples further illustrate the technical solutions of the present invention.

[0027] like Figure 1 and 2As shown, the present invention provides a preform analyzer, including a preform clamping device, a detector 4, a laser device 6, a transparent window 7, an oil tank 5 and a salvage piece 8. The preform clamping device includes a chuck 2, which is located above the transparent window 7. The detector 4 and the laser device 6 are correspondingly arranged on both sides of the transparent window 7. The lower end of the transparent window 7 is fixedly connected to the oil tank 5, and the oil tank 5 is filled with test oil. The salvage piece 8 is arranged in the oil tank 5 so as to be movable up and down.

[0028] The transparent window 7 is a light-transmitting container with a rectangular cross section and an opening at the top, and the material can be pure silica glass. The lower end of the transparent window 7 is fixedly connected with an oil tank 5, and the oil tank is made of metal. The oil tank 5 is filled with test oil, and the test oil is a refractive index matching oil, and the refractive index of the refractive index matching oil is the same as or close to the refractive index of the transparent window 7.

[0029] When the preform analyzer of the present invention is used for testing, the chuck 2 is used to clamp the preform 3 to be tested and vertically placed in the oil tank 5, and immersed in the test oil. After the preform 3 is placed, the liquid level of the test oil should not be lower than the height of the detection laser beam emitted by the laser device 6 to ensure that the laser beam can pass through the test oil in the transparent window 7. The laser device 6 is turned on to emit a detection laser beam, which enters the transparent window 7, passes through the preform 3, and is emitted from the other side of the transparent window 7 to the detector 4; starting from one side edge of the preform 3, the laser device 6 and the detector 4 move synchronously, and the laser beam emitted by the laser device 6 scans the cross section of the preform, while the detector 4 on the other side moves synchronously to receive the laser beam emitted after being refracted by the preform, until the laser beam scans and reaches the other side edge of the optical fiber preform as the end point; during the detection process, the laser device 6 and the detector 4 move synchronously, and always keep the relative position unchanged; due to the change in the refractive index of the core layer and the cladding of the preform in the diameter direction, this change in refractive index causes the laser beam to have different deflections at the exit angle after scanning the preform, so that the position of the laser beam on the detector 4 changes, and the detector 4 converts the position signal into an electrical signal, which is converted into a digital signal by the circuit and transmitted to the computer. The computer analyzes and processes the collected data to complete the measurement of the refractive index distribution of the preform, the rod diameter, the core diameter, the out-of-roundness and the concentricity of the preform.

[0030] The preform rod analyzer of the present invention has a simple structure and can measure parameters such as the refractive index profile, rod diameter, core diameter, out-of-roundness and concentricity of the preform rod, thereby improving detection efficiency and reducing labor costs.

[0031] In a preferred embodiment of the present invention, the preform rod analyzer of the present invention further comprises a stand, which plays a supporting role. The detector, the laser device, the transparent window and the preform rod clamping device are located on the stand, and the oil tank extends downward to the bottom of the stand. The preform rod clamping device further comprises a guide rail 1, which is vertically located on the stand, and a slider is installed on the guide rail. The slider is connected to the lifting drive mechanism, and a rotatable clamp 2 is provided on the slider to vertically clamp the optical fiber preform rod to move up and down and rotate.

[0032] The preform analyzer of the present invention is a precise optical testing instrument. When using the preform analyzer to test the optical fiber preform, the preform may accidentally fall into the oil tank due to loose chuck, broken target rod, improper operation of the tester to hang and take the rod, etc. On the one hand, the impact of the preform when it falls may damage the preform analyzer, causing the glass accessories inside the preform analyzer to be shattered, or the optical elements to be displaced due to vibration, and the optical path is offset, affecting the test results; on the other hand, the preform is made of glass. If it breaks in the oil tank, the oil tank is thin and long, which is not conducive to the salvage of the preform.

[0033] The preform analyzer of the present invention is provided with a salvage piece 8. When in use, the salvage piece 8 is slowly lowered along the inner wall of the oil tank 5 and immersed in the oil tank, with a certain gap between the salvage piece 8 and the tank wall of the oil tank 5, and can move up and down in the oil tank 5. The height of the salvage piece 8 cannot be higher than the transparent window 7 to prevent blocking the laser and affecting the test. The salvage piece 8 can effectively protect the preform and the preform analyzer. When a preform or other foreign matter falls, the salvage piece 8 can be lifted out of the oil tank 5, so as to conveniently remove the preform, glass fragments or other foreign matter.

[0034] The salvage piece 8 is made of stainless steel, with an open top and a closed bottom, which can prevent foreign matter from falling into the oil tank 5 and contaminating the test oil in the oil tank 5. The salvage piece 8 is cylindrical in shape, which can be a cylindrical shape or a square cylindrical shape. Preferably, the shape of the salvage piece 8 matches the oil tank 5.

[0035] Since the oil tank of the preform analyzer of the present invention is thin and long, the salvage piece is set in the oil tank, and the hand cannot reach the depth of the oil tank; the oil tank is filled with refractive index matching oil, which is easy to slip, and it is more difficult to grab the salvage piece. In order to salvage more conveniently, at least one extraction port is provided on the salvage piece 8, and the salvage piece 8 can be quickly lifted by hooking the extraction port, thereby avoiding the process of extracting the refractive index matching oil in the oil tank, disassembling the oil tank, and replacing new oil, and also avoiding the influence of the contamination of the refractive index matching oil on the test results.

[0036] In the present invention, the extraction port can be arranged on the cylinder wall or the upper end of the salvaged piece. In order to further improve the stability of salvaging, preferably, two symmetrical extraction ports are arranged on the salvaged piece to facilitate extraction. The shape of the extraction port is not limited, as long as the salvaged piece can be lifted out of the oil tank, for example, it can be circular, square, arc or irregular.

[0037] In the present invention, a number of oil drain holes are evenly distributed on the cylinder wall of the salvaged piece. When the salvaged piece is lifted, the refractive index matching oil can flow out from the oil drain holes, thereby reducing the pulling force during lifting without contaminating the refractive index matching oil.

[0038] In the present invention, the size of the fishing piece 8 can be the same at the top and the bottom, or thicker at the top and thinner at the bottom.

[0039] like Figure 2 As shown, in one embodiment of the present invention, the size of the salvage piece 8 is the same at the top and bottom. In order to reduce the impact and vibration caused by the fall of the preform and protect the preform analyzer from damage, a buffer 9 is provided at the bottom of the salvage piece 8. The buffer 9 includes an upper cover plate, a lower cover plate and a shock absorbing spring arranged between the upper cover plate and the lower cover plate. The shock absorbing spring can buffer the impact of the salvage piece on the preform analyzer during the fall of the preform.

[0040] like Figure 3 As shown, in another embodiment of the present invention, the maximum size of the top of the salvaged piece is greater than the maximum size of the bottom of the salvaged piece, that is, the salvaged piece 8 is thicker at the top and thinner at the bottom. Since the salvaged piece is thicker at the top and thinner at the bottom, the oil in the salvaged piece is squeezed during the falling process of the preform rod to decelerate the falling process, which can effectively protect the preform rod analyzer and the preform rod.

[0041] To further protect the preform, the maximum size of the bottom of the salvage piece is smaller than the minimum size of the preform end face. When the preform falls, the salvage piece with a narrow bottom can clamp the preform to prevent it from falling further and hitting the preform analyzer.

[0042] Optionally, a buffer 9 may be provided at the bottom of the salvage piece with a thick upper part and a thin lower part, and the buffer 9 includes an upper cover plate, a lower cover plate, and a shock absorbing spring disposed between the upper cover plate and the lower cover plate. The shock absorbing spring can buffer the impact of the salvage piece on the preform analyzer during the falling process of the preform.

[0043] The preform analyzer of the present invention has a simple structure, can quickly detect preforms, improves detection efficiency, and reduces labor costs. In addition, a salvage piece is provided inside the preform analyzer to effectively protect the preform and the preform analyzer. If the preform accidentally falls, the preform can be conveniently and quickly taken out without disassembling the oil tank or extracting the test oil, thereby reducing the pollution of the test oil and saving costs.

[0044] It should be pointed out that the above is only used to explain the preferred embodiments of the present invention, and is not intended to limit the present invention in any form. Therefore, any modifications or changes made to the present invention under the same inventive spirit should still be included in the scope of protection intended by the present invention.

Claims

1. A preform rod analyzer, characterized in that: The invention comprises a preform rod clamping device, a detector, a laser device, a transparent window, an oil tank and a salvage piece, wherein the preform rod clamping device comprises a clamping head, wherein the clamping head is located above the transparent window, the detector and the laser device are correspondingly arranged on both sides of the transparent window, the lower end of the transparent window is fixedly connected with an oil tank, wherein the oil tank is filled with test oil, and the salvage piece is arranged in the oil tank so as to be movable up and down; the top of the salvage piece is open, and the bottom of the salvage piece is closed; the salvage piece is cylindrical; the maximum dimension of the top of the salvage piece is greater than the maximum dimension of the bottom of the salvage piece; the maximum dimension of the bottom of the salvage piece is smaller than the minimum dimension of the end face of the preform rod; a buffer piece is arranged at the bottom of the salvage piece; the buffer piece comprises an upper cover plate, a lower cover plate and a shock-absorbing spring arranged between the upper cover plate and the lower cover plate.

2. The preform rod analyzer according to claim 1, characterized in that: The test oil is a refractive index matching oil, and the refractive index of the refractive index matching oil is the same as or close to the refractive index of the transparent window.

3. The preform rod analyzer according to claim 1, characterized in that: The height of the salvage piece is not higher than the transparent window.

4. The preform rod analyzer according to claim 1, characterized in that: The salvaging piece is provided with at least one extraction port.

5. The preform rod analyzer according to claim 4, characterized in that: The shape of the extraction port is circular, square, arc-shaped or irregular.

6. The preform rod analyzer according to claim 1, characterized in that: Oil drain holes are distributed on the cylinder wall of the salvage piece.

7. The preform rod analyzer according to claim 1, characterized in that: It also includes a stand, the detector, the laser device, the transparent window and the preform rod clamping device are located on the stand, and the oil tank extends downward to below the stand.

8. The preform rod analyzer according to claim 1, characterized in that: The preform rod clamping device also includes a guide rail, and the clamping head is movably arranged on the guide rail.

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