CN100567930C - The measuring method and the device thereof of the core out-of-roundness of fibre parent material - Google Patents
The measuring method and the device thereof of the core out-of-roundness of fibre parent material Download PDFInfo
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- CN100567930C CN100567930C CNB2005800090280A CN200580009028A CN100567930C CN 100567930 C CN100567930 C CN 100567930C CN B2005800090280 A CNB2005800090280 A CN B2005800090280A CN 200580009028 A CN200580009028 A CN 200580009028A CN 100567930 C CN100567930 C CN 100567930C
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Abstract
A kind of measuring method and device thereof of core out-of-roundness of fibre parent material, it is the method for measuring the core out-of-roundness of fibre parent material with core and cladding part, it is characterized in that, fibre parent material be impregnated in the liquid that equates generally with the refractive index of the cladding part of this fibre parent material, from the side-irradiation directional light of this fibre parent material and measure the intensity distributions of transmitted light, mensuration by the width of the dark portion that light produced by core in the hope of the core diameter relative value, more make fibre parent material rotation core relative value in the hope of the Zhou Fangxiang complex points, based on the plural core diameter relative value of gained in the hope of the core out-of-roundness.Not influenced by the refringence of core/covering and the interval of light projector/light-receiving device, can the often correct and easy core out-of-roundness of measuring.
Description
Technical field
The present invention is, about the assay method and the device thereof of core (core) the portion out-of-roundness of fibre parent material.
Specified applicant country is the person that can incorporate the list of references into, and the content that can put down in writing with reference to following application case is incorporated its content into this case reference, a part of recording and narrating as this case.
Jap.P. is special is willing to March 23 2004 2004-84718 date of application
Jap.P. is special is willing to January 18 2005 2005-10585 date of application
Background technology
In recent years, for the long distanceization of restriction optical communication or the principal element of high speed, the influence of polarisation membrane type chromatic dispersion (below the Polarization Mode Dispersion., being called PMD) receives publicity.PMD is meant that the two-mode of the plane of polarisation (plane of polarization) with mutual orthogonal is by propagating the phenomenon that the width of the pulse of its incident (pulse) enlarges along with propagating with only different speed in optical fiber in optical fiber.
Common monotype (single mode) optical fiber be have core with in its periphery covering lower (clad) portion than this core refractive index, the light of institute's incident advances in the mode that is closed in core generally.Core is the situation of complete proper circle, though this two-mode is demoted (degradation) and can not be distinguished, but at core is non-proper circle, and applies strain when destroying symmetry in the stage of making optical fiber or optical cable at core, and the speed of the two-mode of propagating in optical fiber produces difference and produces PMD.
When the influence of PMD became big, overlapping in the part of the different signal pulse of optical communication, it is impossible that the detection of signal pulse sometimes becomes.Therefore, special in the situation that strictly requires the PMD characteristic, the out-of-roundness of tight management of optical fibers core becomes important.
The out-of-roundness of the core of optical fiber is for example measured by near field image (Near Field Image) method.But, because the diameter of the core of single mode fibers has only 10 μ m degree at most for very little, except shortcoming is measured precision, the influence of the state of the mensuration face during also easily by fiber cut.Therefore, the out-of-roundness of core wishes also to measure with the stage of preform (preform) (below, single claim preform) at optical fiber.
The out-of-roundness of preform for example is to use Laser Outer Diameter Measuring Sensors, and one side makes preform rotation one side from plural direction detection external diameter, by the maximal value of the external diameter data of gained and the difference of minimum value are divided by with mean value, can ask out-of-roundness.Other uses minimum from calculating ellipse formulas such as multiplication, and from the length of major axis and minor axis, and these mean values also can be asked out-of-roundness.
But,, can not measure with said method because the out-of-roundness of the core of preform is normally synthetic with one by the part of core and cladding part.
Patent documentation 1 as shown in Figure 1, motion makes fibre parent material 2 connect the mode horizontal arrangement of the container I that is full of the liquid that equates generally with the refractive index of cladding part, directional lights are shone from light source portion 3 in side at fibre parent material 2, make the light of transmission be subjected to light, based on the light intensity distributions of gained method in the hope of the core out-of-roundness at light accepting part 4.The method is to measure the width of bright portion of light intensity distributions in the hope of the core diameter relative value, from then on tries to achieve the core out-of-roundness.
Patent documentation 1: the Jap.P. spy opens the 2003-42894 communique
; understanding is by the bright portion of the core optically focused method in the hope of the patent documentation 1 of core out-of-roundness; for the purpose of the oil that matches in making container 1 (with the rough liquid that equates of the refractive index of core) does not leak from the logical portion of inserting of fibre parent material 2; in the logical portion of inserting of container 1 with the rubber-like packing seal; however when the length direction of fibre parent material 2 is measured with complex points; when container 1 was relatively moved, the oil that matches had the situation of leakage.
And, the method for patent documentation 1 as shown in Figure 2, according to the refringence of core 5/ covering 6 and the interval of light projector 3/ light-receiving device 4, expression is become not obvious by the boundary of the width a of the bright portion of core institute optically focused, the detection of the width of bright portion has difficulty or impossible situation.
With the value of calculating in claim 2 and the illustrated method of Fig. 3 of patent documentation 1, be expression and out-of-roundness based on elliptical shape is different person again.Reason is, in the situation with ELLIPTIC REVOLUTION 360 degree, is that large-diameter portion and small diameter part are respectively observed secondary.Claim 2 and Fig. 3 at patent documentation 1 only respectively observe large-diameter portion and small diameter part once.
Summary of the invention
The present invention is in view of above-mentioned problem, so that the refringence of disobeying core/covering and the interval of light projector/light-receiving device to be provided, can be often correct and be easy to measure the core out-of-roundness fibre parent material the core out-of-roundness assay method with and device be purpose.
The assay method of core out-of-roundness of the present invention, it is the method for core out-of-roundness of measuring the fibre parent material of tool core and cladding part, it is characterized in that, fibre parent material be impregnated in the liquid that equates generally with the cladding part refractive index of this fibre parent material, measure the intensity distributions of transmitted light from the side-irradiation directional light of this fibre parent material, mensuration by the light by core at the width of the dark portion that intensity distributions produced in the hope of the core diameter relative value, and make fibre parent material rotation ask core diameter relative value in the complex points of Zhou Fangxiang, based on the plural core diameter relative value of gained in the hope of the core out-of-roundness.
In the present invention,, be determined as suitable with the parallel light projector type measuring outside diameter device (for example, KEYENCE factory system LS-7500) that uses adjustable whole detection threshold by the width of the dark portion that light produced by core.
The core out-of-roundness is that difference by the maximal value of the core relative value Dc (Φ) that is measured from plural Zhou Fangxiang Φ and minimum value is divided by the mean value of core relative value Dc (Φ), perhaps use A and B with Dc (Φ) and Φ substitution Dc (Φ)=A+Bsin2 Φ gained, calculate 2B/A in the hope of.The former is the maximum out-of-roundness that expression can be considered from measured value, and the latter becomes the out-of-roundness of only extracting oval composition out.
The latter's calculating can use Fourier (Fourier) to analyze or the high-speed Fourier analysis.The advantage of using Fourier analysis or high-speed Fourier to analyze is to make match (fitting) result who removes low order composition (composition of sin Φ) and high order composition (sin3 Φ, sin4 Φ, sin5 Φ ...) fully, can only try to achieve easily with calculating.
The mensuration of core out-of-roundness, be to make the fibre parent material arranged perpendicular and carry out, accommodate liquid container at least to the fibre parent material irradiation part that directional light and transmitted light thereof passed through, be material, preferably with the material formation identical with cladding part to equate generally with the cladding part refractive index.
Accommodate the container of liquid, at least to fibre parent material irradiation directional light and transmitted light institute thereof by partly having relative parallel outside surface.And, establish hole cylindraceous in these container central authorities, the relative parallel outside surface of container and the inside surface in hole cylindraceous are advisable through mirror ultrafinish.
Fluid temperature in the container and the environment temperature that core out-of-roundness determinator is set are adjusted in certain generally.
The determinator of the core out-of-roundness of fibre parent material of the present invention, be the device of measuring the core out-of-roundness of fibre parent material, it is characterized in that comprising impregnating unit, illumination unit, determination unit, try to achieve unit, and the rotary unit of core diameter relative value with core and cladding part.Wherein, impregnating unit is that fibre parent material be impregnated in the liquid that equates generally with the refractive index of the cladding part of this fibre parent material.Illumination unit is the side-irradiation directional light of the fibre parent material in impregnated in this liquid.Determination unit is an intensity distributions of measuring the transmitted light of transmission fibre parent material.The unit of trying to achieve the core diameter relative value is to be determined at the width of this intensity distributions by the dark portion that light produced by core.Rotary unit is to be spin fiber mother metal in addition measure this core diameter relative value in the Zhou Fangxiang of fibre parent material complex points for the purpose of, and based on plural core diameter relative value in the hope of the core out-of-roundness.
Determinator by core out-of-roundness of the present invention, have and make the unit of fibre parent material vertically to be supported, at least the part of passing through to fibre parent material irradiation directional light and transmitted light thereof of accommodating the container of liquid be with cladding part refractive index identical material generally, preferably constitute with identical material.Again, the irradiates light at least of container and the part that transmitted light passes through are having relative parallel outside surface, preferably to establish hole cylindraceous in the central, and the inside surface in this outer surface and hole cylindraceous is through mirror ultrafinish.
The unit of trying to achieve the core diameter relative value can use directional light light projector type measuring outside diameter device and the preform analyzer (preform analyzer) (index distribution analyzer) that can adjust detection threshold.The control of each unit and calculation process are to carry out with the control arithmetic unit.When making this mensuration set of systems go into the preform analyzer, can carry out the mensuration of index distribution and core out-of-roundness with same device, effect is preferable.
According to by the assay method of the core out-of-roundness of fibre parent material of the present invention and device thereof the time, can be correctly and be easy to the core out-of-roundness of mensuration fibre parent material.
Description of drawings
Fig. 1 is by the skeleton diagram of the assay method of the explanation non circularity of core of known techniques.
Fig. 2 is by the skeleton diagram of the explanation light intensity distributions of known techniques.
Fig. 3 is the skeleton diagram that is illustrated in the determinator of non circularity of core used in the present invention.
Fig. 4 is the skeleton diagram of explanation in the optical detecting portion of the assay method of non circularity of core used in the present invention.
Fig. 5 is the skeleton diagram of explanation by light intensity distributions of the present invention.
Fig. 6 is the skeleton diagram of explanation by light intensity distributions of the present invention.
Fig. 7 is explanation other routine skeleton diagrams by the optical system of determinator of the present invention.
Fig. 8 is for the optical system by determinator of the present invention, and the skeleton diagram that other are routine is described.
To be expression measure the dark portion of light intensity distributions from plural Zhou Fangxiang Φ to Fig. 9, in the hope of the curve map of the example of core diameter relative value Dc (Φ).
1: content 2: fibre parent material
3: light projector 4: light-receiving device
7: hanging portion 8: oil matches
9: container 10: oil groove
11: illumination part 12: optical detection part
13: laser (LED diffusion light) 14: hole cylindraceous
15: preform analyzer lasing light emitter
16: the core out-of-roundness is measured and is used light projector
18: the core out-of-roundness is measured and is used light-receiving device
Embodiment
Below, though be illustrated the present invention with inventive embodiment, following embodiment is limited about claim of the present invention, illustrated combination of features whole are not that to be defined as the section institute of solution institute of invention necessary among embodiment again.
The assay method of core out-of-roundness of the present invention, it is side-irradiation directional light from fibre parent material, measure the dark portion of light intensity distributions in the hope of core diameter relative value Dc (Φ) at the plural Zhou Fangxiang Φ of fibre parent material, make the mean value of the difference of the maximal value of core diameter relative value and minimum value divided by the core diameter relative value, perhaps, use with Dc (Φ) and Φ match (fitting) in the A and the B of Dc (Φ)=A+Bsin2 Φ gained, calculate 2B/A in the hope of core out-of-roundness person, light intensity distributions can use the directional light light projector type measuring outside diameter device that can adjust detection threshold to measure.
Light intensity distributions shines when fibre parent material directional light as shown in Figure 5, transmission covering 6 only directly advance the only convergence of the core 5 that the transmission refractive index is high.Therefore be that boundary at cladding part and core produces bright a and the b of portion secretly at sensitive surface.
But, the situation that the refringence of core/covering is big, or light-receiving device is in the situation at rear more, the focal position than sensitive surface than the place ahead, illustrated as Fig. 2, have the profile of bright a not obvious, situation that fully can't identification.
Therefore, though in the unconspicuous situation of the profile of bright a, when using the phase diameter of width identification core of the dark b of portion shown in Figure 6, can the position of the refringence of tube core/covering and light-receiving device not is good identification.At this moment, by adjusting the detection threshold of light accepting part, for the preform of all core external diameters, core/covering ratio, the mensuration that the position of this dark b of portion also can be detected really and energy is correct.
Below, for the assay method and the device of core out-of-roundness of the present invention, though more explain detailedly, the present invention is not limited to these explanations, has various ways.
At first, as shown in Figure 3, the fibre parent material 2 that comprises in the hanging portion 7 of rotating reciprocating mechanism will vertically be installed in, impregnated in in the oil groove (oiltank) 10 with the container (cell) 9 that is full of the oil 8 that matches, shine directional lights from the side of fibre parent material 2 by illumination part 11, the light intensity that makes transmitted light is measured by optical detection part 12, in the hope of the light intensity distributions of the footpath direction of fibre parent material 2.
So, owing to make fibre parent material 2 with vertical dipping among the oil groove 10 of opening up, can as patent documentation 1, not produce the situation that the oil 8 that matches leaks.And, because optical detecting portion in the upper end of oil groove 10, moves up and down by making fibre parent material 2, easily all positions of measured length direction.And, when rotating by making fibre parent material 2, can measure the light intensity distributions of Zhou Fangxiang in any position in hanging portion 7.
The oil 8 that matches is that to be adjusted into refractive index identical generally with the refractive index of the cladding part of fibre parent material 2.
Optical detecting portion can use directional light light projector type measuring outside diameter device as shown in Figure 4, comprises illumination part 11, transparent container 9 and optical detection part 12 herein.Wherein, illumination part 11 is to make directional light, and for example laser or LED diffusion light 13 are shone in fibre parent material 2.Transparent container 9 is to be full of the oil 8 that matches.Optical detection part 12 is the transmitted lights that detect transmission fibre parent material 2.
Even, the detection threshold of optical detection part 12 adjustably transmissive light, by this, clearly identification can correctly be measured the core diameter relative value in the dark portion that the core peripheral part of light intensity distributions is produced.
For prevent to match between oil 8 and container material by for the purpose of the error of anaclasis, container 9 is with the material that equates generally with the refractive index of cladding part, preferably with identical material constitutor with cladding part.And the outside surface of container portions 9 constitutes the plane of incidence of light and exit facet with parallel to each other, to incident light and emergent light to become vertical plane, to prevent refraction at the light of container 9.
Even, because the refractive index of the oil 8 that matches is changed by temperature, adjust in a rough timing by temperature that makes the air that optical detecting portion is set and the temperature that matches oil 8, can more promote the mensuration precision.
Fiber optics mother metal 2 is arranged at the central authorities of container 9, is accommodated in to be full of among oil 8 the hole cylindraceous 14 that matches, and by this kind formation, the cladding part that can make fibre parent material 2 diminishes with the error that is produced by refringence of the oil 8 that matches.
The inside surface in the outside surface of container 9 and hole cylindraceous 14 in addition during mirror ultrafinish, can more be promoted the mensuration precision.
Use the device of above-mentioned formation, the dark portion that measures light intensity distributions at the plural Zhou Fangxiang Φ of fibre parent material is shown in Fig. 9 in the hope of the example of core diameter relative value Dc (Φ).Among the figure, solid line is according to measured value person, and dotted line is with match (fitting) gained person.
To be the difference that makes the maximal value of core diameter relative value and minimum value be calculated as 0.61% divided by the situation of the mean value of core diameter relative value to the core out-of-roundness.Shown in dotted line, use the A and the B that Dc (Φ) and Φ are fit to Dc (Φ)=A+Bsin Φ gained, calculate the situation of 2B/A in the hope of the core out-of-roundness, be by A=4.346, B=0.0106 is calculated as 0.49%.
Owing to there is the sin composition of low order and high order to exist, the core out-of-roundness of the situation that is fit to Dc (Φ)=A+Bsin2 Φ and calculates diminishes, the composition that can consider low order represents to result from noise (noise) composition of determinator, and the composition of high order is represented actual core shape.
Even, also can be at core out-of-roundness determinator of the present invention, assembling preform analyzer is with the formation of common container, reciprocating mechanism, rotating mechanism etc.
For example, as shown in Figure 7, the optical system that preform is measured constituted with lasing light emitter 15 and this light-receiving device 16 with, the optical system configurations that is made of with light projector 17 and this light-receiving device 18 non circularity of core mensuration becomes orthogonal, as shown in Figure 8, also can make these optical system configurations in about.Be this kind formation by becoming, the preparation of the arrangement etc. of work changed jointly, to promote determination efficiency.
More than, though the present invention is illustrated with embodiment, technical scope of the present invention is not to be defined in the scope that the foregoing description is put down in writing.Anyly have the knack of this skill person and understand at the foregoing description and can add multiple change or improvement.The form that adds change or improvement also must be contained in technical scope second joint of the present invention, can be understood from the record of claim.
When of the present invention, can make the fibre parent material that is supplied in backguy in efficient and correct in advance inspection, in the manufacturing management of fibre parent material for extremely useful.
Claims (23)
1. the assay method of the core out-of-roundness of a fibre parent material, it is the assay method of measuring the core out-of-roundness of fibre parent material with core and cladding part, it is characterized in that, fibre parent material be impregnated in the liquid identical generally with the refractive index of the cladding part of above-mentioned fibre parent material, from the side-irradiation directional light of above-mentioned fibre parent material to measure the intensity distributions of transmitted light, mensuration by the light by above-mentioned core at the width of the dark portion that above-mentioned intensity distributions produced in the hope of the core diameter relative value, more make the rotation of above-mentioned fibre parent material trying to achieve above-mentioned core diameter relative value in the complex points of Zhou Fangxiang, based on the more above-mentioned plural core diameter relative value of gained in the hope of the core out-of-roundness.
2. the assay method of the core out-of-roundness of fibre parent material as claimed in claim 1 is characterized in that the width by the above-mentioned dark portion that light produced of above-mentioned core, uses directional light light projector type measuring outside diameter device to be measured.
3. the assay method of the core out-of-roundness of fibre parent material as claimed in claim 2 is characterized in that above-mentioned directional light light projector type measuring outside diameter device can adjust detection threshold.
4. as the assay method of the core out-of-roundness of any one described fibre parent material in the claim 1 to 3, it is characterized in that the mean value of the difference of maximal value by making the more above-mentioned core diameter relative value of measuring from plural Zhou Fangxiang and minimum value, try to achieve above-mentioned core out-of-roundness divided by above-mentioned core diameter relative value.
5. as the assay method of the core out-of-roundness of any one described fibre parent material in the claim 1 to 3, it is characterized in that making the more above-mentioned core diameter relative value Dc (Φ) that measures from plural Zhou Fangxiang Φ, with
Dc(Φ)＝A+Bsin2Φ
Carry out match, making 2B/A is above-mentioned core out-of-roundness.
6. the assay method of the core out-of-roundness of fibre parent material as claimed in claim 5 is characterized in that above-mentioned match is to use Fourier (Fourier) to analyze or the high-speed Fourier analysis.
7. as the assay method of the core out-of-roundness of any one described fibre parent material in the claim 1 to 3, the mensuration that it is characterized in that above-mentioned core out-of-roundness is that above-mentioned fibre parent material is disposed at vertically to carry out.
8. as the assay method of the core out-of-roundness of any one described fibre parent material in the claim 1 to 3, it is characterized in that making the part of passing through to above-mentioned fibre parent material irradiation directional light and transmitted light thereof at least of the container of accommodating aforesaid liquid, constitute with the material identical generally with the refractive index of above-mentioned cladding part.
9. as the assay method of the core out-of-roundness of any one described fibre parent material in the claim 1 to 3, it is characterized in that making the part of passing through to above-mentioned fibre parent material irradiation directional light and transmitted light thereof at least of the container of accommodating aforesaid liquid, constitute with identical material with above-mentioned cladding part.
10. as the assay method of the core out-of-roundness of any one described fibre parent material in the claim 1 to 3, above-mentioned fibre parent material it is characterized in that when vertically impregnated in aforesaid liquid, the outside surface that the part that the container of accommodating aforesaid liquid passes through to above-mentioned fibre parent material irradiation directional light and transmitted light thereof at least has opposing parallel is established hole cylindraceous in the central authorities of said vesse.
11. the assay method of the core out-of-roundness of fibre parent material as claimed in claim 10, the inside surface that it is characterized in that relative parallel above-mentioned outside surface and above-mentioned cylindrical hole are through mirror ultrafinish.
12. the assay method as the core out-of-roundness of any one described fibre parent material in the claim 1 to 3 is characterized in that the aforesaid liquid of said vesse is regulated in certain temperature.
13. as the assay method of the core out-of-roundness of any one described fibre parent material in the claim 1 to 3, the adjustment of air of determinator that it is characterized in that being provided with above-mentioned core out-of-roundness is for certain generally.
14. the determinator of the core out-of-roundness of a fibre parent material is a device of measuring the core out-of-roundness of the fibre parent material with core and cladding part, it is characterized in that comprising:
Impregnating unit is that fibre parent material be impregnated in the liquid that equates generally with the refractive index of the cladding part of above-mentioned fibre parent material;
Illumination unit, the side-irradiation directional light of the above-mentioned fibre parent material in impregnated in aforesaid liquid;
Determination unit, the intensity distributions of the transmitted light of the above-mentioned fibre parent material of mensuration transmission;
Try to achieve core diameter relative value unit, be determined at above-mentioned intensity distributions by the width of the dark portion that light produced by above-mentioned core in the hope of the core diameter relative value; And
Rotary unit makes above-mentioned fibre parent material rotation, in order to measure above-mentioned core diameter relative value in the Zhou Fangxiang of above-mentioned fibre parent material complex points; And
Based on above-mentioned plural core diameter relative value in the hope of the core out-of-roundness.
15. the determinator of the core out-of-roundness of fibre parent material as claimed in claim 14 is characterized in that the above-mentioned core diameter relative value unit of asking is a directional light light projector type measuring outside diameter device.
16. the determinator of the core out-of-roundness of fibre parent material as claimed in claim 15 is characterized in that above-mentioned directional light light projector type measuring outside diameter device can adjust detection threshold.
17., it is characterized in that having and above-mentioned fibre parent material propped up be held in vertical unit as the determinator of the core out-of-roundness of any one described fibre parent material in the claim 14 to 16.
18. determinator as the core out-of-roundness of any one described fibre parent material in the claim 14 to 16, what it is characterized in that making the container of accommodating aforesaid liquid shines the part that above-mentioned directional light and transmitted light thereof pass through to above-mentioned fibre parent material at least, with the material formation that equates generally with the refractive index of above-mentioned cladding part.
19. determinator as the core out-of-roundness of any one described fibre parent material in the claim 14 to 16, what it is characterized in that making the container of accommodating aforesaid liquid shines the part that above-mentioned directional light and transmitted light thereof pass through to above-mentioned fibre parent material at least, constitutes with identical material with above-mentioned cladding part.
20. determinator as the core out-of-roundness of any one described fibre parent material in the claim 14 to 16, above-mentioned fibre parent material it is characterized in that when vertically impregnated in aforesaid liquid, the said vesse of accommodating aforesaid liquid is shining above-mentioned directional light and the transmitted light outside surface by partly having opposing parallel at least to above-mentioned fibre parent material, establish hole cylindraceous in the central authorities of said vesse.
21. the determinator of the core out-of-roundness of fibre parent material as claimed in claim 20 is characterized in that the above-mentioned outside surface of opposing parallel and the inside surface of above-mentioned cylindrical hole are through mirror ultrafinish.
22. the determinator as the core out-of-roundness of any one described fibre parent material in the claim 14 to 16 is characterized in that comprising the preform analyzer.
23. the determinator as the core out-of-roundness of any one described fibre parent material in the claim 14 to 16 is characterized in that comprising:
Control arithmetic unit, carry out the control and the calculation process of each unit.
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|---|---|---|---|
| JP2004084718 | 2004-03-23 | ||
| JP084718/2004 | 2004-03-23 | ||
| JP010585/2005 | 2005-01-18 |
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| CN1934432A CN1934432A (en) | 2007-03-21 |
| CN100567930C true CN100567930C (en) | 2009-12-09 |
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| CN102878955B (en) * | 2012-10-09 | 2015-05-20 | 中天科技精密材料有限公司 | Measuring equipment and measuring method for eccentricity ratios of large-diameter preform |
| PL3014238T3 (en) * | 2013-06-25 | 2018-08-31 | Prysmian S.P.A. | Method for detecting defects in a rod-shaped transparent object |
| CN105318841B (en) * | 2015-10-21 | 2018-03-27 | 长飞光纤光缆股份有限公司 | A kind of method of testing of anti-bending multimode fiber core diameter |
| CN108917629B (en) * | 2018-04-24 | 2021-03-30 | 雅视特科技（杭州）有限公司 | Nondestructive measurement equipment for spheroidization degree of nodular cast iron and measurement method thereof |
| WO2020065632A1 (en) * | 2018-09-28 | 2020-04-02 | 信越化学工業株式会社 | Optical fiber preform |
| CN109341577B (en) * | 2018-10-19 | 2020-06-12 | 北京市机械施工有限公司 | Steel pipe machining ovality detection device |
| CN109579665A (en) * | 2018-12-24 | 2019-04-05 | 上海起帆电缆股份有限公司 | Metal tape armour gap measuring method |
| CN111156911A (en) * | 2019-08-12 | 2020-05-15 | 长飞光纤光缆股份有限公司 | Optical fiber coating layer diameter measuring system and testing method |
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