CN1497253A - Refractivity distributing measuring method of permeant - Google Patents
Refractivity distributing measuring method of permeant Download PDFInfo
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- CN1497253A CN1497253A CNA031594913A CN03159491A CN1497253A CN 1497253 A CN1497253 A CN 1497253A CN A031594913 A CNA031594913 A CN A031594913A CN 03159491 A CN03159491 A CN 03159491A CN 1497253 A CN1497253 A CN 1497253A
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- index distribution
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- 238000000034 method Methods 0.000 title claims abstract description 15
- 230000003287 optical effect Effects 0.000 claims abstract description 50
- 239000007788 liquid Substances 0.000 claims abstract description 32
- 238000003556 assay Methods 0.000 claims description 17
- 230000010354 integration Effects 0.000 claims description 11
- 238000012937 correction Methods 0.000 claims description 6
- 238000005259 measurement Methods 0.000 claims description 5
- 239000000654 additive Substances 0.000 claims description 4
- 230000000996 additive effect Effects 0.000 claims description 4
- 230000000007 visual effect Effects 0.000 claims description 2
- 239000000835 fiber Substances 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000005286 illumination Methods 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 239000012780 transparent material Substances 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
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- 238000005859 coupling reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
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- 238000002224 dissection Methods 0.000 description 1
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- 239000000463 material Substances 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
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Abstract
To provide a method for accurately measuring the refractive index distribution of a transparent body, by correcting the amount of distortion and amount of light attenuation of an optical system at measuring the refractive index distribution of the transparent body. At measuring the refractive index distribution of a preform rod 8, by photographing information from an image 1 arranged in the back of the preform rod 8 by an image photographing device 4, the original amount of distortion and the amount of light attenuation of the optical system, which comprises the image 1; a refractive index matching liquid 2; a refractive index matching liquid tank 3; and the image photographing device 4, are previously measured to correct measured values of the preform rod 8. As a result of this, measure the true refractive index distribution of the transparent body without errors from the optical system. (C)2004,JPO.
Description
Technical field
The present invention relates to the index distribution assay method 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 legal system to make charge bar (raw material of optical fibre), and then as required it is stretched, and is made into the fiber optics of required diameter.Charge bar is by the high excellent heart of refractive index with around being centered around, and the covering that the refractive index ratio rod heart is low constitutes.
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 charge bar state, measure, one of its method is to integrate the behind configuration image of the charge bar in the liquid being immersed in refractive index, and the amount distortion when passing charge bar and observe this image is measured its index distribution.This method is by propositions (with reference to patent documentation 1) such as applicant.
Patent documentation 1: the spy opens the 2000-121499 communique
Yet above-mentioned existing technology exists the following problem that still need solve.That is to say, when adopting the charge bar that is being immersed in the refractive index integration liquid to dispose image behind, when the amount distortion when passing this charge bar and observe this image is measured the method for index distribution, the image dissection degree depends on the ability of camera, light receiving element group's number of elements for example, but, integrate liquid bath, refractive index by above-mentioned image, refractive index and integrate amount distortion and the light decrement that optical system that liquid and camera constitute originally had and to have influence on measurement result, make in the measurement result of index distribution of charge bar and may contain error.
When adopting existing basis that the distortion of image is arranged, measure under the situation of index distribution, for example in black and white 2 value images, when judging the boundary line of white and black, will white (Ming Liang part the most) and deceive between (unglazed part) and be divided into 255 dark light grades, with the value predesignated therebetween (for example with the 160th bright place in 255 grades as the black and white separatrix.But the reason light such as state that dirt and charge bar occur owing to optical system are attenuated sometimes.Changing appears in the brightest white value.When this white value of appearance changed, because of black value and no change, thereby displacement will appear in the separatrix of reality.Yet because marginal position is predetermined, the result but becomes wrong value, causes error thus.
Generally do not consider above-mentioned influence when measuring now the index distribution of charge bar, thereby occur when unusual in measurement result, and unclear this be because charge bar self is undesired that cause or because optical system causes unusually unusually, and to be summed up as charge bar unusual without exception.
Summary of the invention
The purpose of this invention is to provide a kind ofly when measuring the index distribution of the transparent body, revise the amount distortion that optical system has, accurately measure the method for transparent body index distribution.
In order to solve above-mentioned problem, the present invention adopts following formation.Be that index distribution assay method of the present invention is equipped with the behind that refractive index is integrated the transparent body in the refractive index integration liquid bath of liquid for image being configured to be immersed in, make the above-mentioned transparent body and image be in same optical axis, by across the above-mentioned transparent body, be configured in the distortion that the camera mensuration on the above-mentioned visual opposite location is passed the above-mentioned image of the above-mentioned transparent body.The method is characterized in that: measure before the index distribution of the above-mentioned transparent body, determine earlier by above-mentioned image, refractive index and integrate liquid bath, refractive index is integrated the amount distortion and/or the light decrement of the optical system of liquid and camera formation, then after the index distribution of measuring the above-mentioned transparent body, revise with the amount distortion and/or the light decrement of above-mentioned optical system.
Particularly, the mensuration of the amount distortion of optical system is preferably under the state that transparent body is not immersed in the refractive index integration liquid and carries out.In addition, when measuring the amount distortion of optical system, preferably carry out the temperature correction.The mensuration of the light decrement of optical system preferably is immersed in the transparent body carries out after refractive index is integrated in the liquid, preferably determines maximal value, minimum value and the above intermediate value of light quantity.In addition, when measuring the light decrement of optical system,, adjust the required light quantity of light decrement of measuring optical system preferably according to the quantity that should ask for the additive that comprises in the transparent body of index distribution.In the case, the adjustment of light quantity, preferably adopt to adjust the lighting source of image brightness, use the aperture of camera or use optical filter, a kind of method wherein or be used in combination said method.In addition, when the amount distortion of measuring optical system and/or light decrement, depart under the situation of the benchmark of predesignating, can end to measure, carry out the correction of optical system in separately value.
Description of drawings
Fig. 1 is a kind of key diagram of embodiment of the optical system of index distribution determinator of the present invention.
Fig. 2 is the illustration figure of the amount distortion of optical system.
Number in the figure explanation: 1, image, 2, refractive index integrates liquid, 3, refractive index integrates liquid bath, 4, image-photographing device, 5, light source, 8, charge bar
Embodiment
Introduce the index distribution assay method of the transparent body of the present invention below with concrete example.
Fig. 1 is the vertical view of a kind of embodiment of expression assay method of the present invention.The optical system of using in (a) expression assay method of the present invention among Fig. 1.The optical system that the present invention uses basically by the refractive index that image 1, dress refractive index are integrated liquid (coupling oil) 2 integrate liquid bath 3, camera 4 constitutes, above-mentionedly respectively constitute part and all be configured on the same optical axis.And be provided with the light source 5 that is used for to the image illumination in image 1 behind, the part of the camera lens 6 among camera 4 is equipped with aperture and optical filter, and refractive index integration liquid bath 3 can arrive camera 4 for the information that makes image 1, preferably adopt transparent material to make, perhaps at least from image 1 to the optical axis of camera 4, in the required scope of the index distribution of measuring the transparent body, adopt transparent material to make light inlet window 7.At this, be the error that causes for the refractive index that reduces the transparent body of asking for index distribution and its surrounding air, just make and measure precision and further improve and use refractive index integration liquid.And be used for measuring the concrete mensuration embodiment of index distribution, can adopt the method described in the patent documentation 1.
Among this kind optical system, constitute refractive index and integrate the position etc. of respectively constituting that liquid 2, refractive index integrates in the camera 4 headed by the material of the light inlet window 7 of liquid bath 3, the camera lens 6 etc. and locate, just there is amount distortion originally.Therefore, the amount distortion of image 1 information after by above-mentioned each position measured in advance as the amount distortion of optical system.Shown in Fig. 1 (b), again with the transparent body, for example the charge bar 8 that is made of quartz glass is dipped into refractive index and integrates in the liquid 2 amount distortion of utilizing camera 4 to measure by the image 1 of this charge bar 8 then.After doing like this,, can obtain the real index distribution of charge bar 8 from by deducting the amount distortion numerical value of the optical system of obtaining in advance the amount distortion behind the charge bar 8.At this moment, preferably measure the environment temperature of optical system and the temperature that refractive index is integrated liquid 2 in advance, the trip temperature correction of going forward side by side.When being preferably in the index distribution of each mensuration charge bar 8 certainly, the temperature measuring that refractive index is integrated liquid 2 carries out, but also can determine refractive index in advance and integrate liquid value at various temperatures, so, just needn't when the index distribution of each mensuration charge bar 8, carry out the temperature measuring that refractive index is integrated liquid 2, make to measure to become more easy.
Fig. 2 illustrates an example of the amount distortion that adopts the optical system that method of the present invention obtains.Among this figure, transverse axis is represented the position of the photo detector of camera, adopts the camera of 1280 pixels in the present embodiment.When the longitudinal axis represented to adopt camera to take image, image had produced great distortion, has promptly produced great skew, represents undistorted state when consistent with center line (0 line).The unit transverse axis, the longitudinal axis that use among the figure are pixel.This amount distortion is deducted from the amount distortion of the index distribution of the charge bar 8 obtained, can be obtained the real index distribution of charge bar.
Introduce the assay method of the light decrement of optical system below.At first, make it to be in its grade point of the brightest state estimating (light quantity), close illumination then, under dark state, measure its grade point (light quantity) the image illumination.And then determine an intermediate value (light quantity) at least and investigate its linearity, will be divided into 255 dark light grades between maximal value and the minimum value, on the position of regulation, define boundaries.Because this work is if carried out determining each separatrix, thereby can prevent to resemble the error at measurment that now causes because of marginal malposition like this before measuring the index distribution of charge bar.In addition, when the sensitivity of failing to keep optical system from the above-mentioned light decrement of obtaining linear, preferably can before the index distribution of measuring charge bar, carry out the sensitivity correction and reduce error at measurment.In addition, because the reference value of pre-set light decrement, when occurring being lower than the situation of this reference value, can be envisioned for and the dirt that optical system is measured occur influencing, thereby the index distribution that can end charge bar is measured, measure again after waiting to find out its reason, can obtain the measurement result of high reliability.
And when the mensuration light decrement, owing to the situation of charge bar, for example the amount of additive (dopant dose) is how much different, and light quantity can change, thereby wants to improve the mensuration precision, preferably charge bar is immersed in the refractive index integration liquid to measure.In such cases, can adjust the required light quantity of light decrement of measuring optical system according to the amount of the additive that comprises in the charge bar that should ask for index distribution.The adjustment of light quantity can be by adjusting image the aperture, optical filter etc. of brightness, camera of lighting source in a certain, or be used in combination above-mentioned the whole bag of tricks.
In addition, be that example is introduced though use the charge bar that constitutes by quartz glass in the present embodiment, so long as the inner transparent body that index distribution is arranged, all applicable the present invention is for example also applicable to the thing of measuring transparent plastic and so on.
If adopt the index distribution assay method of the transparent body of the present invention, when the index distribution of the transparent body is measured in the distortion that utilizes image, owing to can determine amount distortion and light decrement that the optical system measured just has originally in advance, revise its amount distortion and light decrement among the measured value of the transparent body, thereby can determine the index distribution of the free from error real transparent body.
Claims (8)
1, a kind of index distribution assay method that is used for the transparent body, this method transparent body inside has index distribution, it is characterized in that: image is configured to the refractive index that is immersed in the refractive index integration liquid that is equipped with integrates transparent body behind in the liquid bath, 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 of the above-mentioned image that passes the above-mentioned transparent body; Analyze this measurement result, measure the index distribution of the above-mentioned transparent body, wherein, before the index distribution of measuring the above-mentioned transparent body, at first measure the amount distortion and/or the light decrement of the optical system that constitutes by above-mentioned image, refractive index integration liquid bath, refractive index integration liquid and image-photographing device; Then after the index distribution of measuring the above-mentioned transparent body, revise with the amount distortion and/or the light decrement of above-mentioned optical system.
2, the index distribution assay method of the transparent body according to claim 1 is characterized in that: the mensuration of the amount distortion of above-mentioned optical system, carry out under the state in the above-mentioned transparent body not being immersed in above-mentioned refractive index integration liquid.
3, the index distribution assay method of the transparent body according to claim 2 is characterized in that: carry out the temperature correction when measuring the amount distortion of above-mentioned optical system.
4, the index distribution assay method of the transparent body according to claim 1 is characterized in that: the mensuration of the light decrement of above-mentioned optical system is immersed in the above-mentioned transparent body in the above-mentioned refractive index integration liquid carries out.
5, the index distribution assay method of the transparent body according to claim 4 is characterized in that: the mensuration of the light decrement of above-mentioned optical system is maximal value, minimum value and the above intermediate value that determines light quantity.
6, according to the index distribution assay method of the claim 4 or the 5 described transparent bodies, it is characterized in that: when measuring the light decrement of above-mentioned optical system, according to the quantity of the additive that is comprised in the transparent body that should ask for index distribution, adjust the required light quantity of light decrement of measuring above-mentioned optical system.
7, the index distribution assay method of the transparent body according to claim 6, it is characterized in that: the adjustment of above-mentioned light quantity, the method for one of adopt adjusting in the brightness of the lighting source of above-mentioned image, the aperture that uses above-mentioned camera or the optical filter or the combination of these methods are carried out.
8, according to the index distribution assay method of each described transparent body in the claim 1 to 7, it is characterized in that: measure above-mentioned optical system amount distortion and/or during light decrement, when each value departs from the reference value of predesignating, end this mensuration, carry out the correction of optical system.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP293413/2002 | 2002-10-07 | ||
| JP2002293413A JP3665780B2 (en) | 2002-10-07 | 2002-10-07 | Method for measuring refractive index distribution of transparent body |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1497253A true CN1497253A (en) | 2004-05-19 |
Family
ID=32284325
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA031594913A Pending CN1497253A (en) | 2002-10-07 | 2003-09-27 | Refractivity distributing measuring method of permeant |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP3665780B2 (en) |
| CN (1) | CN1497253A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114739627B (en) * | 2022-03-16 | 2023-07-21 | 中国农业大学 | Optical matching calibration method and device for internal flow field of complex structure |
-
2002
- 2002-10-07 JP JP2002293413A patent/JP3665780B2/en not_active Expired - Fee Related
-
2003
- 2003-09-27 CN CNA031594913A patent/CN1497253A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| JP3665780B2 (en) | 2005-06-29 |
| JP2004125724A (en) | 2004-04-22 |
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