CN1493866A - Method for measuring refrection index of transparency and its apparatus - Google Patents
Method for measuring refrection index of transparency and its apparatus Download PDFInfo
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- CN1493866A CN1493866A CNA031594891A CN03159489A CN1493866A CN 1493866 A CN1493866 A CN 1493866A CN A031594891 A CNA031594891 A CN A031594891A CN 03159489 A CN03159489 A CN 03159489A CN 1493866 A CN1493866 A CN 1493866A
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- 238000000034 method Methods 0.000 title description 13
- 230000000007 visual effect Effects 0.000 claims description 38
- 238000003556 assay Methods 0.000 claims description 20
- 239000007788 liquid Substances 0.000 claims description 17
- 230000003287 optical effect Effects 0.000 claims description 16
- 230000010354 integration Effects 0.000 claims description 6
- 238000005259 measurement Methods 0.000 claims description 5
- 238000002791 soaking Methods 0.000 claims description 2
- 238000003384 imaging method Methods 0.000 claims 1
- 238000002224 dissection Methods 0.000 description 12
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 239000000835 fiber Substances 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000005253 cladding Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000284 extract Substances 0.000 description 2
- 239000013307 optical fiber Substances 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/41—Refractivity; Phase-affecting properties, e.g. optical path length
- G01N21/412—Index profiling of optical fibres
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- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
At measuring the refractive index distribution of a preform rod 1, by photographing information from an image 4 arranged in the back of the preform rod 1 by an image photographing device 5, the size of the preform rod 1 can be adjusted in the field of view of the image photographing device. The size of the preform rod 1 is adjusted, by moving the image photographing device 5 and mounting a lens for enlarging the field of view to the image photographing device 5. Therefore, even if the preform rod takes any size, even if it is desired to measure only a specific section of the preform rod, since it is possible to adjust the size of the preform rod in the field of view of the image photographing device at all times so as to acquire the most appropriate resolution, it is possible to highly accurately measure the refractive index distribution of the preform rod.
Description
Technical field
The present invention relates to index distribution assay method and determinator that inside has the transparent body of index distribution.
Background technology
Along with the development of communication network in recent years, the growing trend of demand of optical cable has appearred.The fiber optics of one of key element of formation optical cable at first adopts VAD method or MCVD etc. to be made into prefabricated rods (optical fiber blank), and then as required it is stretched as the optical fiber of required diameter.Prefabricated rods is made of the high excellent heart of refractive index and low covering of the refractive index ratio rod heart of being centered around around it.
This just requires a kind of assay method of index distribution, whether can reach the required characteristic of fiber optics according to design objective so that judge it.When measuring the index distribution of fiber optics, usually all under the prefabricated rods state, measure, the most common assay method is prefabricated rods to be immersed in the known refractive index of refractive index integrate in the liquid (coupling oil), with with respect to prefabricated rods axially for inject laser etc. for vertical angle from light source, according to the angle and the position of the light that sees through, measure index distribution.Under the situation that adopts this assay method, the limit is measured mobile equally spacedly limit, the position of optical system, but because this spacing directly has influence on the mensuration precision, thereby, spacing need be divided very thin in order to realize high-precision measuring.Therefore, when carrying out high-precision measuring, must need to take a long time.
The someone proposes that excellent heart portion with variations in refractive index is set at different mensuration spacings with the unconverted cladding part of refractive index and measures for this reason, so that improve determination efficiency (can with reference to patent documentation 1).In addition, the somebody proposes, at first whole prefabricated rods is carried out the globality bigness scale, and then the part that extracts variations in refractive index is measured (with reference to patent documentation 2) after improving the image dissection degree at this position once more.
In addition by proposition and the entirely different methods of said method such as applicant, this method be with image be configured to be immersed in refractive index integrate in the liquid prefabricated rods behind, amount distortion when observing this image by prefabricated rods is measured index distribution.
(with reference to patent documentation 3)
Patent documentation 1: the spy opens flat 8-271379 communique
Patent documentation 2: the spy opens the 2000-81373 communique
Patent documentation 3: the spy opens the 2000-121499 communique
Yet in above-mentioned prior art, exist the following problem that needs solution.Promptly in prefabricated rods being immersed in the known refractive index integration liquid (coupling oil) of refractive index, with with respect to prefabricated rods axially for vertical angular illumination laser beam, among the method according to the angle of the light that sees through and position finding index distribution, exist and want to carry out the problem that high-precision measuring needs spended time.In addition, adopt different spacings to carry out method for measuring with the unconverted cladding part of refractive index and earlier prefabricated rods is carried out the globality bigness scale in the vicissitudinous excellent heart of refractive index portion, improve and carry out method for measuring once more after the image dissection degree at this position and can improve its efficient but still very time-consuming though extract the vicissitudinous part of refractive index then.
Corresponding with it, image is being configured to the prefabricated rods behind that is immersed in the refractive index integration liquid, according to passing the amount distortion of prefabricated rods when observing this image, measure in the method for index distribution, because the image dissection degree depends on the ability of camera, light receiving element group's number of elements for example, though with patent documentation 1, patent documentation 2 is compared, can solve the long problem of spended time to a certain extent, but because for energy complete observation prefabricated rods, distance between prefabricated rods and camera is set to fixed range always, thereby has produced inconvenience when the transparent body of observing small scale reaches certain privileged site of only measuring the transparent body.
Summary of the invention
The object of the present invention is to provide a kind of can not being subjected to the size of the transparent body again and measuring index distribution determinator and the assay method that limit at the position in the efficient mensuration of realization aspect the time.
In order to solve above-mentioned problem, the present invention has adopted following formation.That is to say, index distribution assay method of the present invention is characterised in that: image is configured to the transparent body behind that is immersed in the refractive index integration liquid bath that refractive index integration liquid is housed, make the above-mentioned transparent body and image be in same optical axis, measure the distortion that above-mentioned image passes the above-mentioned transparent body by the camera that is configured on the above-mentioned visual opposite location across the above-mentioned transparent body, analyze this measurement result, measure among the method for index distribution of the above-mentioned transparent body, the size of the above-mentioned transparent body in the visual field of above-mentioned camera is set at and can adjusts.
Particularly, the size of the transparent body is adjusted by the distance of adjusting the camera and the transparent body.This carries out apart from adjusting preferably camera to be carried on the mobile platform.In addition, the size of the transparent body is adjusted with the visual field expansion camera lens that is installed on the camera.And the visual field enlarges camera lens and preferably uses the zoom lens that can broaden one's vision continuously, perhaps uses the camera lens of a plurality of camera lenses of combination.In addition, the use also capable of being combined of the size of the transparent body is adjusted camera and is adjusted with the distance of the transparent body and the visual field expansion camera lens of installing on camera.
In addition, index distribution determinator of the present invention is characterised in that: have by being configured in image on the same optical axis, being used for adorning that the refractive index of soaking the transparent body integrates that the refractive index of liquid is integrated liquid bath and across the above-mentioned transparent body at this, be configured on the above-mentioned visual opposite location, be used for measuring among the transparent body refractive index measuring apparatus of the optical system that the camera of the above-mentioned pattern distortion that passes the above-mentioned transparent body constitutes, above-mentioned camera has the device that can adjust the above-mentioned transparent body size in its visual field.
Particularly, the device that can adjust the transparent body size in the visual field of camera preferably is installed in camera on the optical axis movably.In addition, the device that can adjust the transparent body size in the visual field of camera is preferably installed the visual field and is enlarged camera lens on camera, and the visual field enlarges camera lens can use the zoom lens that can broaden one's vision continuously or the combination of a plurality of lens etc.In addition, the device that can adjust the above-mentioned transparent body size in the visual field of camera also can composite set, makes camera be installed on the optical axis movably and the visual field is installed on camera to enlarge camera lens.
Description of drawings
Fig. 1 is the key diagram of a kind of embodiment of index distribution determinator of the present invention.
Fig. 2 is the illustration figure of the size adjustment situation of the transparent body in the visual field of expression camera.
Fig. 3 is the diagram of measurement result of the present invention.
Number in the figure: 1, prefabricated rods, 4, image, 5, camera, 6, mobile platform, 7, plummer, 8, the visual field enlarges camera lens,
Embodiment
Introduce the index distribution assay method of the transparent body of the present invention and the embodiment of determinator with concrete example below.At first introduce determinator of the present invention, introduce its assay method then.
Fig. 1 represents a kind of embodiment in the determinator of the present invention.In Fig. 1, it is that the refractive index that the refractive index of the prefabricated rods 1 that constitutes of the quartz glass of the transparent body is integrated liquid (coupling oil) 2 is integrated liquid bath 3, is configured in refractive index and integrates behind image 4 of liquid bath 3, take the optical system that the camera 5 of the information of the image 4 that passes prefabricated rods 1 constitutes basically that determinator of the present invention has by immersion is housed; Refractive index is integrated liquid bath 3, image 4 and camera 5, is configured in respectively on the same optical axis across prefabricated rods 1.
This camera 5 is installed on the mobile platform 6, and mobile platform 6 can move towards direction shown in the arrow on plummer 7, so that the distance of adjustment and prefabricated rods.In addition, the visual field has been installed on the camera 5 and has enlarged camera lens 8.But the visual field enlarges the so-called zoom lens that camera lens can use continuity to broaden one's vision, and also a plurality of camera lenses can be used in combination.
Above-mentioned visual 4 can use image such as the black and white two-value of patterns such as right-angle triangle and isosceles triangle etc.And, pass the pattern of image 4 that inside has the prefabricated rods 1 of index distribution, according to different index distribution, arrive camera 5 with distortion status.Ask for deflection function according to this amount distortion, determine the index distribution of prefabricated rods 1 by parsing this value.About concrete mensuration mode, the method described in the available patent documentation 3.And refractive index to integrate liquid be the loss that causes for the refringence that reduces because of prefabricated rods 1 and air, make to measure precision and further improve and use.
With regard to assay method of the present invention, introduce a kind of embodiment below.In the present invention, when adopting the said determination device, when measuring the index distribution of prefabricated rods 1 in camera 5 visuals field, the camera 5 on the mobile platform 6 is moved on plummer 7, close towards prefabricated rods 1, till the distance of the size that can obtain best image dissection degree.Because the amount distortion information that arrives camera 5 is increased, and the image dissection degree rises, thereby can determine more detailed index distribution.
Fig. 2 illustrates the position of the prefabricated rods 1 in the visual field of camera 5, and the position when (a) being prefabricated rods 1 beginning is that camera 5 is close towards prefabricated rods 1 (b), and arrival can obtain the illustration till enough image dissection degree sizes.And the part identical with Fig. 1 adopted same label.
When measuring the index distribution of prefabricated rods 1 in the visual field of camera 5, seeking out best image dissection degree not only can be close with camera 5, but when the zoom lens that uses continuity to broaden one's vision, when measuring the index distribution of prefabricated rods 1, also can obtain the size of best image dissection degree by adjusting camera lens.In addition, also can broaden one's vision and measure by making up a plurality of camera lenses.In such cases, though the position of not travelling shot device 5 can be measured equally, the position that also can be used in combination travelling shot device 5 obtains to measure required image dissection degree with using above-mentioned camera lens.That is to say,, can adopt the best approach in order to reach purpose of the present invention.
Fig. 3 is according to the curve map that adopts used fixed camera and the picture information that adopts method of the present invention to obtain to draw out.Fig. 3 (a) is used fixed measurement result, and Fig. 3 (b) is the measurement result that adopts the present invention to obtain.The result that employing from Fig. 3 (b) assay method of the present invention obtains compares with used method as can be known, and curve point reaches more than two times, can obtain very high image dissection degree, can carry out more meticulous index distribution and measure.
And, if adopt assay method of the present invention, even the each all differences of measuring of the diameter of prefabricated rods, also can obtain best image dissection degree by the size of adjusting prefabricated rods, even simultaneously because under the situation of certain privileged site of only wanting to measure prefabricated rods, also can only amplify this part, thereby increase the degree of freedom of measuring greatly.
In addition, though in the present embodiment for be the example of the prefabricated rods that constitutes by quartz glass, so long as inner all applicable the present invention of the transparent body, even for example transparent plastic also can be measured fully with index distribution.
If adopt the index distribution assay method and the determinator of the transparent body of the present invention, because when utilizing pattern distortion to measure the index distribution of the transparent body, can or the visual field be installed by the travelling shot device and enlarge the size that camera lens is adjusted the transparent body in the visual field of camera, no matter thereby the size of the transparent body how, and want to measure under the situation of certain privileged site, all can obtain very high image dissection degree, determine the index distribution of the transparent body accurately.
Claims (13)
1, a kind of index distribution assay method that is used for the transparent body, this transparent body inside has index distribution, it is characterized in that: image is configured to the transparent body behind that is immersed in the refractive index integration liquid bath that refractive index integration liquid is housed, make the above-mentioned transparent body and image be in same optical axis, by across the above-mentioned transparent body, be configured in the camera of above-mentioned visual opposition side, measure the distortion that above-mentioned image passes the above-mentioned transparent body, analyze this measurement result, measure the index distribution of the above-mentioned transparent body, wherein, the size that is in the above-mentioned transparent body in the above-mentioned camera visual field is set at and can adjusts.
2, the index distribution assay method of the transparent body according to claim 1 is characterized in that: the adjustment of the size of the above-mentioned transparent body is to adjust by the distance of adjusting between the above-mentioned imaging device and the above-mentioned transparent body.
3, the index distribution assay method of the transparent body according to claim 1 is characterized in that: the adjustment of the size of the above-mentioned transparent body is to adjust by the visual field expansion camera lens that is installed on the above-mentioned camera.
4, the index distribution assay method of the transparent body according to claim 3 is characterized in that: it is the zoom lens of broadening one's vision serially that the above-mentioned visual field enlarges camera lens.
5, the index distribution assay method of the transparent body according to claim 3 is characterized in that: the above-mentioned visual field enlarges camera lens and is formed by a plurality of combination of lensess.
6, the index distribution assay method of the transparent body according to claim 1 is characterized in that: the adjustment of the size of the above-mentioned transparent body is to adjust by the visual field expansion camera lens that distance that is used in combination the above-mentioned camera of adjustment and the above-mentioned transparent body and use are installed on the above-mentioned camera.
7, according to the index distribution assay method of the claim 2 or the 6 described transparent bodies, it is characterized in that: the adjustment of the size of the above-mentioned transparent body is to adjust by above-mentioned camera being carried on the mobile platform that can adjust with the distance of the above-mentioned transparent body.
8, a kind of index distribution determinator that is used for the transparent body, this transparent body inside has index distribution, it is characterized in that comprising optical system, this optical system by: be configured in the image on the same optical axis; The refractive index that is used for soaking the transparent body is housed to be integrated the refractive index of liquid and integrates liquid bath; Across the above-mentioned transparent body, be disposed at above-mentioned visual opposition side, the camera that is used to measure the distortion of the above-mentioned image by the above-mentioned transparent body constitutes, and wherein, above-mentioned camera has the device that can adjust the above-mentioned transparent body size in its visual field.
9, the index distribution determinator of the transparent body according to claim 8 is characterized in that: the device that can adjust the above-mentioned transparent body size in the above-mentioned camera visual field is that above-mentioned camera is installed as the equipment that can move on above-mentioned optical axis.
10, the index distribution determinator of the transparent body according to claim 8 is characterized in that: can adjust the device of the above-mentioned transparent body size in the above-mentioned camera visual field, be that the visual field of installing on above-mentioned camera enlarges camera lens.
11, the index distribution determinator of the transparent body according to claim 10 is characterized in that: it is the zoom lens that can broaden one's vision continuously that the above-mentioned visual field enlarges camera lens.
12, the index distribution determinator of the transparent body according to claim 10 is characterized in that: the above-mentioned visual field enlarges camera lens and is formed by a plurality of combination of lensess.
13, the index distribution determinator of the transparent body according to claim 8 is characterized in that: the device that can adjust the above-mentioned transparent body size in the above-mentioned camera visual field is to be used in combination above-mentioned camera is installed as the equipment that can enlarge camera lens in the equipment that moves on the above-mentioned optical axis and the visual field of installing on above-mentioned camera.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP293412/2002 | 2002-10-07 | ||
| JP2002293412A JP2004125723A (en) | 2002-10-07 | 2002-10-07 | Method and apparatus for measuring refractive index distribution of transparent body |
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| Publication Number | Publication Date |
|---|---|
| CN1493866A true CN1493866A (en) | 2004-05-05 |
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| CNA031594891A Pending CN1493866A (en) | 2002-10-07 | 2003-09-27 | Method for measuring refrection index of transparency and its apparatus |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103154973A (en) * | 2010-10-20 | 2013-06-12 | 玻璃技术公司 | Method and apparatus for measuring transmitted optical distortion in glass sheets |
| CN108507483A (en) * | 2018-03-29 | 2018-09-07 | 长飞光纤光缆股份有限公司 | A kind of measuring device of large-scale optical fiber prefabricating stick |
| CN108572160A (en) * | 2017-03-14 | 2018-09-25 | 华中科技大学 | A kind of refractometer of profile measurement |
| CN111443061A (en) * | 2020-01-10 | 2020-07-24 | 长飞光纤光缆股份有限公司 | Optical fiber perform automatic check out test set |
| CN112782120A (en) * | 2021-01-28 | 2021-05-11 | 清华大学 | Method and device for measuring refractive index of transparent solid with convex cambered surface |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102980746B (en) * | 2012-11-20 | 2015-04-15 | 天津大学 | Crystal optical parameter measurement method based on digital holography |
-
2002
- 2002-10-07 JP JP2002293412A patent/JP2004125723A/en active Pending
-
2003
- 2003-09-27 CN CNA031594891A patent/CN1493866A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103154973A (en) * | 2010-10-20 | 2013-06-12 | 玻璃技术公司 | Method and apparatus for measuring transmitted optical distortion in glass sheets |
| CN108572160A (en) * | 2017-03-14 | 2018-09-25 | 华中科技大学 | A kind of refractometer of profile measurement |
| CN108507483A (en) * | 2018-03-29 | 2018-09-07 | 长飞光纤光缆股份有限公司 | A kind of measuring device of large-scale optical fiber prefabricating stick |
| CN111443061A (en) * | 2020-01-10 | 2020-07-24 | 长飞光纤光缆股份有限公司 | Optical fiber perform automatic check out test set |
| CN112782120A (en) * | 2021-01-28 | 2021-05-11 | 清华大学 | Method and device for measuring refractive index of transparent solid with convex cambered surface |
| CN112782120B (en) * | 2021-01-28 | 2021-11-26 | 清华大学 | Method and device for measuring refractive index of transparent solid with convex cambered surface |
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| Publication number | Publication date |
|---|---|
| JP2004125723A (en) | 2004-04-22 |
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