WO2017024619A1 - Device for measuring friction coefficient of butterfly-shaped optical cable and measurement method therefor - Google Patents
Device for measuring friction coefficient of butterfly-shaped optical cable and measurement method therefor Download PDFInfo
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- WO2017024619A1 WO2017024619A1 PCT/CN2015/087968 CN2015087968W WO2017024619A1 WO 2017024619 A1 WO2017024619 A1 WO 2017024619A1 CN 2015087968 W CN2015087968 W CN 2015087968W WO 2017024619 A1 WO2017024619 A1 WO 2017024619A1
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- G01N19/02—Measuring coefficient of friction between materials
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- the invention belongs to the field of communication optical cable manufacturing, and relates to a measuring device for a friction coefficient of a butterfly optical cable and a measuring method thereof.
- the measuring device and the measuring method thereof are suitable for measuring the friction coefficient of a butterfly optical cable of various specifications.
- Butterfly fiber optic cable is the most common fiber-optic cable in the construction of fiber-to-the-home projects.
- low-friction butterfly cables have been derived in developed regions such as Europe and the United States, and have been put into use in large quantities, that is, the surface of the cable sheath is low.
- the friction characteristics can effectively reduce the friction coefficient between the surfaces of the plurality of butterfly cables, thereby achieving construction time and improving construction efficiency in a complicated and crowded environment such as a pipeline.
- a test butterfly cable is placed along the direction of the butterfly cable in the direction of the butterfly cable on the surface of the butterfly cable of the two metal plates, and one end of the cable is fixed to the spring tension. Calculate and draw it at a constant speed in the horizontal direction. At this time, the traction force can be measured according to the quality of the metal plate covered by the butterfly cable under test ( The butterfly plate attached cable), i.e. the coefficient of sliding friction can be measured ⁇ .
- the above test method has been used by domestic cable manufacturers for a long time to test the surface friction coefficient of the butterfly cable.
- the device method is simple, the package is simple. There are many problems that may cause inaccurate or even severe deviations in measurement results.
- the manual traction of the spring dynamometer in the horizontal direction is difficult to ensure uniform speed.
- the upper and lower metal plates are easily displaced under the influence of the tested optical cable, and the manual traction is not easy to stabilize, and the human error is greatly affected, resulting in inaccurate measurement of the actual traction force.
- the object of the present invention is to provide a measuring device for a friction coefficient of a butterfly cable and a measuring method thereof for the deficiencies of the above test method.
- a measuring device for a friction coefficient of a butterfly cable comprising a friction coefficient test bench, an electronic universal testing machine, a computer terminal and an electronic balance, the friction coefficient test bench comprising a base, the base having a height adjustment knob, and the base is provided above
- the cover plate and the bottom plate of the stainless steel are arranged parallel to each other, and the weight is arranged above the cover plate.
- the electronic universal testing machine is fixed with a tension arm and a pulley bracket.
- the pulley bracket is located directly below the tension arm, and the end of the tension arm is installed. There is a clamp on which a fixed pulley is fixed.
- a method for measuring a friction coefficient of a butterfly cable includes the following steps:
- Step 1 Adjust the position of the clamp to the starting position of the electronic universal testing machine, and select the fixed pulley whose outer diameter is greater than or equal to the minimum bending radius of the tested optical cable and the groove width is greater than or equal to the width of the optical cable, and install;
- Step 2 Apply strong double-sided tape along the long direction in the middle of the cover plate and the bottom plate, and cut the small length of the tested optical cable.
- the double-sided tape on the surface of the two plates is closely packed in the direction, and the double-sided tape is completely covered. , measuring the quality of the cover with an electronic balance, including the quality of the tested optical cable pasted on the surface;
- Step 3 Fix the bottom plate on the friction coefficient test bench, move the test stand to the front of the universal electronic testing machine, and adjust the height to make the bottom plate and the lower edge of the fixed pulley fixed on the electronic universal testing machine;
- Step 4 Take a large section of the tested optical cable, fix one end of it on the fixture, and the other end is vertically pulled through the fixed pulley and horizontally pulled to the low friction test bench, and naturally placed in the middle of the bottom plate, so that the large section is affected.
- the lower surface of the optical cable and the small surface of the bottom surface of the test cable are in close contact with each other and in the same direction;
- Step 5 Cover the cover plate on the bottom plate, and place the weight on the cover plate.
- the total weight of the weight and the cover plate is T, and keep the large section of the lower surface of the tested cable and the lower surface of the covered cable under the surface of the test cable. Closely and in the same direction, and the cover plate is parallel to the bottom plate and does not touch;
- Step 6 Turn on the electronic universal testing machine control switch, so that the large-length tested optical cable can move at a uniform speed of 500 mm/min at a uniform speed of 300 mm under the traction of the clamp;
- the invention has the advantages that the manual operation can be simplified, the test efficiency is improved, the friction coefficient data of the initial production or experiment is measured and found in time, so as to reduce the waste of raw materials in the subsequent production line, on the other hand, the artificial and equipment errors are minimized, and the product test result is effectively guaranteed. Accuracy and reliability.
- FIG. 1 is a schematic structural view of a friction coefficient test stand of the present invention
- FIG. 2 is a schematic structural view of an electronic universal testing machine of the present invention.
- a butterfly-shaped cable friction coefficient measuring device includes a friction coefficient test bench, an electronic universal testing machine, a computer terminal and an electronic balance, a friction coefficient test bench including a base, and a base with a height adjustment knob. Above the base, there are stainless steel parallel and upper and lower cover plates and bottom plates. The top of the cover plate is provided with a weight.
- the electronic universal testing machine is fixed with a tension arm and a pulley bracket. The pulley bracket is located directly below the tension arm, and the end of the tension arm is equipped with a clamp. A fixed pulley is fixed on the pulley bracket.
- a method for measuring a friction coefficient of a butterfly cable includes the following steps:
- Step 1 Adjust the position of the clamp to the starting position of the electronic universal testing machine, and select the fixed pulley whose outer diameter is greater than or equal to the minimum bending radius of the tested optical cable and the groove width is greater than or equal to the width of the optical cable, and install;
- Step 2 Apply strong double-sided tape along the long direction in the middle of the cover plate and the bottom plate, and cut the small length of the tested optical cable.
- the double-sided tape on the surface of the two plates is closely packed in the direction, and the double-sided tape is completely covered. , measuring the quality of the cover with an electronic balance, including the quality of the tested optical cable pasted on the surface;
- Step 3 Fix the bottom plate on the friction coefficient test bench, move the test stand to the front of the universal electronic testing machine, and adjust the height to make the bottom plate and the lower edge of the fixed pulley fixed on the electronic universal testing machine;
- Step 4 Take a large section of the tested fiber optic cable, fix one end of it on the fixture, and the other The end is vertically pulled through the fixed pulley and horizontally pulled to the low friction test rig, and naturally placed in the middle position of the bottom plate, so that the lower surface of the large section of the tested optical cable is in close contact with the upper surface of the tested optical cable and the direction is consistent;
- Step 5 Cover the cover plate on the bottom plate, and place the weight on the cover plate.
- the total weight of the weight and the cover plate is T, and keep the large section of the lower surface of the tested cable and the lower surface of the covered cable under the surface of the test cable. Closely and in the same direction, and the cover plate is parallel to the bottom plate and does not touch;
- Step 6 Turn on the electronic universal testing machine control switch, so that the large-length tested optical cable can move at a uniform speed of 500 mm/min at a uniform speed of 300 mm under the traction of the clamp;
- the invention can simplify the manual operation, improve the test efficiency, timely measure and discover the friction coefficient data of the production or the initial stage of the experiment, so as to reduce the waste of the raw materials of the subsequent production line, on the other hand, minimize the artificial and equipment errors, and effectively ensure the accuracy of the product test results. And reliability.
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Abstract
Description
本发明属于通信光缆制造领域，涉及到一种蝶形光缆表摩擦系数的测量设备及其测量方法，本发明所涉及测量设备及其测量方法适用于各种规格的蝶形光缆表面摩擦系数测量。The invention belongs to the field of communication optical cable manufacturing, and relates to a measuring device for a friction coefficient of a butterfly optical cable and a measuring method thereof. The measuring device and the measuring method thereof are suitable for measuring the friction coefficient of a butterfly optical cable of various specifications.
蝶形光缆作为在光纤入户工程建设中最常见的引入光缆，经过多年发展，目前在欧美等发达地区已经衍生出低摩擦型蝶形光缆，并大量投入使用，即借助光缆护套表面的低摩擦特性，达到有效降低多根蝶形光缆表面之间摩擦系数的目的，从而达到在管道等环境复杂拥挤的敷设场合可以节省施工时间，提高施工效率。Butterfly fiber optic cable is the most common fiber-optic cable in the construction of fiber-to-the-home projects. After years of development, low-friction butterfly cables have been derived in developed regions such as Europe and the United States, and have been put into use in large quantities, that is, the surface of the cable sheath is low. The friction characteristics can effectively reduce the friction coefficient between the surfaces of the plurality of butterfly cables, thereby achieving construction time and improving construction efficiency in a complicated and crowded environment such as a pipeline.
随着低摩擦型蝶形光缆被越来越多地投入到发达国家城市网络建设，各大运营商对该型光缆的表面摩擦性能提出了摩擦系数≤0.25的要求，其传统测试方法多为依据物理滑动摩擦力理论，在具备至少两根蝶形光缆表面直接接触、直接接触表面有相对压力、直接接触表面不完全光滑、直接接触表面有相对运动四个缺一不可的条件下，选取受测蝶形光缆，分别在两块金属板表面，将受测蝶形光缆截取数段，并将其平行、紧密排列粘贴好，形成一块较大的蝶形光缆表面，将两块金属板贴有蝶形光缆的一面相对平行、水平放置，在两块金属板的受测蝶形缆表面之间，沿金属板表面蝶形光缆粘贴方向放置一根受测蝶形光缆，将其一端固定在弹簧拉力计上，并在水平方向上对其进行匀速牵引，这时可以测出牵引力大小，根据受测蝶形光缆上面覆盖的金属板质量(含板上粘贴的蝶形光缆)，即可以测得滑动摩擦系数μ。With the low-friction butterfly cable being more and more invested in the construction of urban networks in developed countries, major operators have proposed a friction coefficient of ≤ 0.25 for the surface friction performance of this type of cable, and the traditional test methods are mostly based on The theory of physical sliding friction is selected under the condition that there are at least two butterfly-shaped optical cable surfaces in direct contact, direct contact surface with relative pressure, direct contact surface is not completely smooth, and direct contact surface has relative motion. Butterfly-shaped optical cable, on the surface of two metal plates, intercepts the butterfly cable under test, and arranges them in parallel and tightly to form a large butterfly cable surface. The two metal plates are affixed with butterflies. One side of the cable is placed in parallel and horizontally. A test butterfly cable is placed along the direction of the butterfly cable in the direction of the butterfly cable on the surface of the butterfly cable of the two metal plates, and one end of the cable is fixed to the spring tension. Calculate and draw it at a constant speed in the horizontal direction. At this time, the traction force can be measured according to the quality of the metal plate covered by the butterfly cable under test ( The butterfly plate attached cable), i.e. the coefficient of sliding friction can be measured μ.
上述测试方法在很长一段时间内是国内各光缆制造商使用较多的测试蝶形光缆表面摩擦系数的方式，设备方式虽然简单奏效，但是包 含很多容易引起测量结果不准确甚至严重偏差的问题。水平方向上弹簧拉力计的手动牵引难以保证匀速，上下两块金属板在受测光缆的影响下容易发生位移，且手动牵引不易稳定，人为误差影响较大，导致测得实际牵引力不准确。The above test method has been used by domestic cable manufacturers for a long time to test the surface friction coefficient of the butterfly cable. Although the device method is simple, the package is simple. There are many problems that may cause inaccurate or even severe deviations in measurement results. The manual traction of the spring dynamometer in the horizontal direction is difficult to ensure uniform speed. The upper and lower metal plates are easily displaced under the influence of the tested optical cable, and the manual traction is not easy to stabilize, and the human error is greatly affected, resulting in inaccurate measurement of the actual traction force.
发明内容Summary of the invention
本发明的目的是针对上述试验方法的不足之处，提供一种蝶形光缆摩擦系数的测量设备及其测量方法。The object of the present invention is to provide a measuring device for a friction coefficient of a butterfly cable and a measuring method thereof for the deficiencies of the above test method.
本发明采用的技术方案是：The technical solution adopted by the invention is:
一种蝶形光缆摩擦系数的测量设备，包括摩擦系数试验台、电子万能试验机、计算机终端与电子天平，所述摩擦系数试验台包括底座，所述底座带有高度调节旋钮，底座上方设有不锈钢的互相平行上下放置的盖板与底板，所述盖板上方设有砝码，所述电子万能试验机上固定有拉力臂和滑轮支架，滑轮支架位于拉力臂正下方，所述拉力臂末端安装有夹具，所述滑轮支架上固定有定滑轮。A measuring device for a friction coefficient of a butterfly cable, comprising a friction coefficient test bench, an electronic universal testing machine, a computer terminal and an electronic balance, the friction coefficient test bench comprising a base, the base having a height adjustment knob, and the base is provided above The cover plate and the bottom plate of the stainless steel are arranged parallel to each other, and the weight is arranged above the cover plate. The electronic universal testing machine is fixed with a tension arm and a pulley bracket. The pulley bracket is located directly below the tension arm, and the end of the tension arm is installed. There is a clamp on which a fixed pulley is fixed.
一种蝶形光缆摩擦系数的测量设备的测量方法，包括如下步骤：A method for measuring a friction coefficient of a butterfly cable includes the following steps:
步骤1：将夹具位置调整至电子万能试验机的起点位置，选取外径大于等于受测试光缆最小弯曲半径、槽宽大于等于光缆宽度的定滑轮，安装；Step 1: Adjust the position of the clamp to the starting position of the electronic universal testing machine, and select the fixed pulley whose outer diameter is greater than or equal to the minimum bending radius of the tested optical cable and the groove width is greater than or equal to the width of the optical cable, and install;
步骤2：在盖板与底板中间部位沿长方向粘贴强力双面胶带，截取等长的受测试光缆小段，在两块板表面双面胶带部分沿其方向紧密排列粘贴，将双面胶带全部覆盖，用电子天平测量盖板的质量，包括表面粘贴的受测试光缆的质量； Step 2: Apply strong double-sided tape along the long direction in the middle of the cover plate and the bottom plate, and cut the small length of the tested optical cable. The double-sided tape on the surface of the two plates is closely packed in the direction, and the double-sided tape is completely covered. , measuring the quality of the cover with an electronic balance, including the quality of the tested optical cable pasted on the surface;
步骤3：将底板固定在摩擦系数试验台，将试验台移动到万能电子试验机正前方，并调整高度使底板与电子万能试验机上固定的定滑轮下缘水平；Step 3: Fix the bottom plate on the friction coefficient test bench, move the test stand to the front of the universal electronic testing machine, and adjust the height to make the bottom plate and the lower edge of the fixed pulley fixed on the electronic universal testing machine;
步骤4：取一大段受测试光缆，将其一端在夹具上固定好，另一端垂直穿过定滑轮后水平拉至低摩擦试验台，并将其自然放置于底板中间位置，使得大段受测光缆的下表面与底板表面的小段受测光缆上表面紧贴并方向一致；Step 4: Take a large section of the tested optical cable, fix one end of it on the fixture, and the other end is vertically pulled through the fixed pulley and horizontally pulled to the low friction test bench, and naturally placed in the middle of the bottom plate, so that the large section is affected. The lower surface of the optical cable and the small surface of the bottom surface of the test cable are in close contact with each other and in the same direction;
步骤5：将盖板覆盖在底板上，将砝码放置于盖板上，砝码与盖板总质量为T，保持大段受测试光缆的上表面与盖板表面的小段受测光缆下表面紧贴并方向一致，并使盖板与底板平行、不发生接触；Step 5: Cover the cover plate on the bottom plate, and place the weight on the cover plate. The total weight of the weight and the cover plate is T, and keep the large section of the lower surface of the tested cable and the lower surface of the covered cable under the surface of the test cable. Closely and in the same direction, and the cover plate is parallel to the bottom plate and does not touch;
步骤6：打开电子万能试验机控制开关，使得大段受测试光缆在夹具的牵引下以500mm/min的速度匀速运动总位移长度300mm；Step 6: Turn on the electronic universal testing machine control switch, so that the large-length tested optical cable can move at a uniform speed of 500 mm/min at a uniform speed of 300 mm under the traction of the clamp;
步骤7：使用位移100mm～250mm范围内的平均拉力F作为受测光缆匀速运动时受到的牵引力，由于受测光缆上下表面均受到同样大小的滑动摩擦力，所以F＝2μT*10，μ＝F/20T，利用计算机终端配合计算。Step 7: Use the average tensile force F in the range of 100mm~250mm displacement as the traction force when the tested optical cable is moving at a constant speed. Since the upper and lower surfaces of the tested cable are subjected to the same sliding friction force, F=2μT*10, μ=F /20T, using computer terminals to coordinate calculations.
本发明的优点：可以简化人工操作，提高测试效率，及时测量和发现生产或实验初期摩擦系数数据，以减少后续生产线原材料浪费,另一方面最大化减小人为和设备误差，有效保证产品测试结果的精确性和可靠性。The invention has the advantages that the manual operation can be simplified, the test efficiency is improved, the friction coefficient data of the initial production or experiment is measured and found in time, so as to reduce the waste of raw materials in the subsequent production line, on the other hand, the artificial and equipment errors are minimized, and the product test result is effectively guaranteed. Accuracy and reliability.
下面结合附图和具体实施方式对本发明作进一步详细叙述。The invention will now be described in further detail with reference to the drawings and specific embodiments.
图1为本发明摩擦系数试验台的结构示意图； 1 is a schematic structural view of a friction coefficient test stand of the present invention;
图2为本发明电子万能试验机的结构示意图。2 is a schematic structural view of an electronic universal testing machine of the present invention.
其中：1、砝码；2、盖板；3、受测光缆；4、底板；5、高度调节旋钮；6、底座；7、电子万能试验机；8、夹具；9、定滑轮；10、滑轮支架。Among them: 1, weight; 2, cover; 3, tested optical cable; 4, bottom plate; 5, height adjustment knob; 6, base; 7, electronic universal testing machine; 8, fixture; 9, fixed pulley; Pulley bracket.
如图1、2所示，一种蝶形光缆摩擦系数的测量设备，包括摩擦系数试验台、电子万能试验机、计算机终端与电子天平，摩擦系数试验台包括底座，底座带有高度调节旋钮，底座上方设有不锈钢的互相平行上下放置的盖板与底板，盖板上方设有砝码，电子万能试验机上固定有拉力臂和滑轮支架，滑轮支架位于拉力臂正下方，拉力臂末端安装有夹具，滑轮支架上固定有定滑轮。As shown in Figures 1 and 2, a butterfly-shaped cable friction coefficient measuring device includes a friction coefficient test bench, an electronic universal testing machine, a computer terminal and an electronic balance, a friction coefficient test bench including a base, and a base with a height adjustment knob. Above the base, there are stainless steel parallel and upper and lower cover plates and bottom plates. The top of the cover plate is provided with a weight. The electronic universal testing machine is fixed with a tension arm and a pulley bracket. The pulley bracket is located directly below the tension arm, and the end of the tension arm is equipped with a clamp. A fixed pulley is fixed on the pulley bracket.
一种蝶形光缆摩擦系数的测量设备的测量方法，包括如下步骤：A method for measuring a friction coefficient of a butterfly cable includes the following steps:
步骤1：将夹具位置调整至电子万能试验机的起点位置，选取外径大于等于受测试光缆最小弯曲半径、槽宽大于等于光缆宽度的定滑轮，安装；Step 1: Adjust the position of the clamp to the starting position of the electronic universal testing machine, and select the fixed pulley whose outer diameter is greater than or equal to the minimum bending radius of the tested optical cable and the groove width is greater than or equal to the width of the optical cable, and install;
步骤2：在盖板与底板中间部位沿长方向粘贴强力双面胶带，截取等长的受测试光缆小段，在两块板表面双面胶带部分沿其方向紧密排列粘贴，将双面胶带全部覆盖，用电子天平测量盖板的质量，包括表面粘贴的受测试光缆的质量；Step 2: Apply strong double-sided tape along the long direction in the middle of the cover plate and the bottom plate, and cut the small length of the tested optical cable. The double-sided tape on the surface of the two plates is closely packed in the direction, and the double-sided tape is completely covered. , measuring the quality of the cover with an electronic balance, including the quality of the tested optical cable pasted on the surface;
步骤3：将底板固定在摩擦系数试验台，将试验台移动到万能电子试验机正前方，并调整高度使底板与电子万能试验机上固定的定滑轮下缘水平；Step 3: Fix the bottom plate on the friction coefficient test bench, move the test stand to the front of the universal electronic testing machine, and adjust the height to make the bottom plate and the lower edge of the fixed pulley fixed on the electronic universal testing machine;
步骤4：取一大段受测试光缆，将其一端在夹具上固定好，另一 端垂直穿过定滑轮后水平拉至低摩擦试验台，并将其自然放置于底板中间位置，使得大段受测光缆的下表面与底板表面的小段受测光缆上表面紧贴并方向一致；Step 4: Take a large section of the tested fiber optic cable, fix one end of it on the fixture, and the other The end is vertically pulled through the fixed pulley and horizontally pulled to the low friction test rig, and naturally placed in the middle position of the bottom plate, so that the lower surface of the large section of the tested optical cable is in close contact with the upper surface of the tested optical cable and the direction is consistent;
步骤5：将盖板覆盖在底板上，将砝码放置于盖板上，砝码与盖板总质量为T，保持大段受测试光缆的上表面与盖板表面的小段受测光缆下表面紧贴并方向一致，并使盖板与底板平行、不发生接触；Step 5: Cover the cover plate on the bottom plate, and place the weight on the cover plate. The total weight of the weight and the cover plate is T, and keep the large section of the lower surface of the tested cable and the lower surface of the covered cable under the surface of the test cable. Closely and in the same direction, and the cover plate is parallel to the bottom plate and does not touch;
步骤6：打开电子万能试验机控制开关，使得大段受测试光缆在夹具的牵引下以500mm/min的速度匀速运动总位移长度300mm；Step 6: Turn on the electronic universal testing machine control switch, so that the large-length tested optical cable can move at a uniform speed of 500 mm/min at a uniform speed of 300 mm under the traction of the clamp;
步骤7：使用位移100mm～250mm范围内的平均拉力F作为受测光缆匀速运动时受到的牵引力，由于受测光缆上下表面均受到同样大小的滑动摩擦力，所以F＝2μT*10，μ＝F/20T，利用计算机终端配合计算。Step 7: Use the average tensile force F in the range of 100mm~250mm displacement as the traction force when the tested optical cable is moving at a constant speed. Since the upper and lower surfaces of the tested cable are subjected to the same sliding friction force, F=
本发明可以简化人工操作，提高测试效率，及时测量和发现生产或实验初期摩擦系数数据，以减少后续生产线原材料浪费,另一方面最大化减小人为和设备误差，有效保证产品测试结果的精确性和可靠性。 The invention can simplify the manual operation, improve the test efficiency, timely measure and discover the friction coefficient data of the production or the initial stage of the experiment, so as to reduce the waste of the raw materials of the subsequent production line, on the other hand, minimize the artificial and equipment errors, and effectively ensure the accuracy of the product test results. And reliability.
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| CN201510487270.4 | 2015-08-11 | ||
| CN201510487270.4A CN105115890A (en) | 2015-08-11 | 2015-08-11 | Measuring device of friction coefficient of papilionaceous optical cable and measuring method of measuring device |
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| WO2017024619A1 true WO2017024619A1 (en) | 2017-02-16 |
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| PCT/CN2015/087968 Ceased WO2017024619A1 (en) | 2015-08-11 | 2015-08-25 | Device for measuring friction coefficient of butterfly-shaped optical cable and measurement method therefor |
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| CN108120669A (en) * | 2017-12-20 | 2018-06-05 | 浙江华电器材检测研究所有限公司 | A kind of device of dynamic friction coefficient test |
| CN108693198A (en) * | 2018-03-08 | 2018-10-23 | 西南交通大学 | A kind of clamping device and synchrotron radiation in situ imaging fatigue tester |
| CN117871227A (en) * | 2023-12-06 | 2024-04-12 | 江西苏强格液压有限公司 | A wear resistance and flexure test device and test method for outer coating of rubber hose |
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| CN107314972B (en) * | 2017-06-15 | 2019-09-27 | 烽火通信科技股份有限公司 | A kind of test device and test method of butterfly optical cable optical fiber elasticity |
| CN107238544A (en) * | 2017-07-28 | 2017-10-10 | 江苏通光电子线缆股份有限公司 | A kind of optical cable abrasion resistance test method and equipment |
| CN112880969B (en) * | 2021-03-01 | 2022-07-08 | 长飞光纤光缆股份有限公司 | Device and method for testing surface properties of optical fiber |
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