CN103698342A - Laser scattering-based optical-fiber prefabricated rod defect detection method - Google Patents
Laser scattering-based optical-fiber prefabricated rod defect detection method Download PDFInfo
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- CN103698342A CN103698342A CN201410014164.XA CN201410014164A CN103698342A CN 103698342 A CN103698342 A CN 103698342A CN 201410014164 A CN201410014164 A CN 201410014164A CN 103698342 A CN103698342 A CN 103698342A
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- 238000001514 detection method Methods 0.000 title claims abstract description 15
- 239000013307 optical fiber Substances 0.000 title claims abstract description 12
- 230000007547 defect Effects 0.000 title abstract description 7
- 230000003287 optical effect Effects 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 claims abstract description 8
- 238000002356 laser light scattering Methods 0.000 claims description 19
- 238000003384 imaging method Methods 0.000 claims description 15
- 239000012530 fluid Substances 0.000 claims description 9
- 239000012535 impurity Substances 0.000 claims description 4
- 238000006073 displacement reaction Methods 0.000 abstract 2
- 239000007788 liquid Substances 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 7
- 238000010276 construction Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 210000004877 mucosa Anatomy 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000007123 defense Effects 0.000 description 1
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- 238000007380 fibre production Methods 0.000 description 1
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Abstract
The invention belongs to the technical field of optical detection, and particularly relates to a laser scattering-based optical-fiber prefabricated rod defect detection method. A laser and a camera are fixed on a two-dimensional displacement platform, an optical-fiber prefabricated rod is immersed in matching liquid, and linear beams outputted by a laser vertically shine on the optical-fiber prefabricated rod; the two-dimensional displacement platform is adjusted through a computer, so that the linear beams can scan the entire optical-fiber prefabricated rod; a picture is obtained by the computer through the camera, and defects and the position of each defect of the optical-fiber prefabricated rod are judged according to the laser scattering spots. By adopting the method, the weaknesses of the manual observation such as low efficiency, low reliability and poor consistency can be eliminated, and the advantages such as high efficiency, high precision and full automation can be realized.
Description
Technical field
The invention belongs to optical detective technology field, particularly a kind of preform flaw detection method based on laser light scattering.
Background technology
Optical detective technology has important application in fields such as scientific research, industry, medical treatment, Large Infrastructure Projects construction, space flight and aviation, national defense and military.What in recent years, laser, optical imagery and computer technology progressive promoted optical detective technology further develops and has expanded range of application.
The invention of optical fiber, has brought the revolutionary variation of the communications field, has greatly changed people's life and the mode of production.Preform is the basic product of tool core technology in optical fiber production link, and its quality directly affects the quality of optical fiber, so the detection technique of preform is very important.Due to the impact of production technology and environment, preform inside is usually with flaws such as air, magazines, and its quantity and distribution are one of key parameters of judgement preform quality.
The detection of preform flaw at present mainly adopts artificial visually examine and manual record in light-illuminating situation, and this method need to rely on experienced workman's operation, and detection efficiency is very low, and testing result confidence level, consistance are all lower.Therefore, inventing a kind of automatic testing method that does not rely on people has great importance.
Summary of the invention
The present invention is exactly for the deficiencies in the prior art, has proposed a kind of preform flaw detection method based on laser light scattering.
Method of the present invention comprises the following steps:
Step (1) is vertically fixed on preform to be measured on computer-controlled one dimension jacking gear; Control one dimension jacking gear, preform is immersed in completely in the matching fluid that is contained in rectangular vessel, the refractive index of matching fluid is consistent with optical fiber precast rod refractivity;
Step (2) is selected laser instrument, the two-dimension translational platform of camera, the output of line style light beam and is furnished with the computing machine of corresponding control software; Computing machine connects laser instrument, the two-dimension translational platform of one dimension jacking gear, camera, the output of line style light beam by data line; The laser instrument of camera, the output of line style light beam is fixed on two-dimension translational platform by support, the line style light beam vertical irradiation preform of laser instrument perpendicular to a surface of rectangular vessel, the imaging optical path of camera is perpendicular to preform and perpendicular to line style light beam; Line style light beam and the preform intersection of laser instrument are arranged on the object plane of camera imaging system.
Step (3) is opened the auto Detection Software in laser instrument, camera and computing machine successively; Camera on two-dimension translational platform and laser instrument be with the state operation of bidimensional scanning, makes the line style light beam of laser instrument progressively scan the region at whole preform place; In the process of the line style light beam autoscan of laser instrument, camera Real-time Collection picture, and whether automatic decision preform there is flaw and determines the position of flaw.
In the time of the line style light beam irradiates preform of laser instrument, if corresponding irradiation area does not have the flaw of bubble or impurity, laser experience uniform dielectric, does not observe laser light scattering spot in the picture after camera imaging; If corresponding irradiation area has the flaw of bubble or impurity, due to laser light scattering, in picture after camera imaging, will observe laser light scattering spot, according to the position of the position of laser light scattering spot in picture and the scanning of two-dimension translational platform, can judge the concrete three-dimensional position of preform flaw.When the line style light beam of laser instrument progressively scans behind the region at whole preform place, computing machine can obtain the distributed intelligence of whole preform flaw.
The present invention is applicable to preform Defect Detection, utilize the line style light beam irradiates preform of laser instrument, the laser light scattering spot imaging forming with Ear Mucosa Treated by He Ne Laser Irradiation flaw determines that flaw exists, and determines the distributed intelligence of flaw in preform in conjunction with two-dimension translational platform and imaging picture laser light scattering facula position.The present invention has got rid of the shortcoming that efficiency is low, with a low credibility, consistance is poor that artificial observation brings, and has the advantages such as efficiency is high, precision is high, full-automatic.
Accompanying drawing explanation
Fig. 1 is one-piece construction schematic diagram of the present invention;
Fig. 2 is that in embodiment, the preform flaw detection method based on laser light scattering detects the prefabricated rods flaw distribution plan obtaining.
Embodiment
As shown in Figure 1, the preform Defect Detection device based on laser light scattering comprises support 9, the computing machine 10 of laser instrument 8, connecting laser and the two-dimension translational platform of preform to be measured 1, one dimension jacking gear 2, matching fluid 3, rectangular vessel 4, two-dimension translational platform 5, camera 6, the support 7 that connects camera and two-dimension translational platform, the output of line style light beam.Preform 1 to be measured is fixed on one dimension jacking gear 2; Preform 1 to be measured immerses matching fluid 3 completely; Matching fluid 3 is contained in rectangular vessel 4; Camera 6 is fixed on two-dimension translational platform 5 by support 7; The laser instrument 8 of line style light beam output is fixed on two-dimension translational platform 5 by support 9; The line style light beam vertical irradiation of laser instrument 8 outputs is also vertical with a surface of rectangular vessel 4 on preform 1, and the imaging optical path of camera 6 is vertical with line style light beam and the preform 1 of laser instrument 8 outputs; Computing machine 10 is connected with the laser instrument 8 of one dimension jacking gear 2, two-dimension translational platform 5, camera 6, the output of line style light beam by data line.
The method of specific implementation preform Defect Detection comprises the following steps:
(1) preform to be measured 1 is vertically fixed on computer-controlled one dimension jacking gear 2; Control one dimension jacking gear 2, preform 1 is immersed in the matching fluid 3 that is contained in rectangular vessel 4 completely, the refractive index of matching fluid 3 is consistent with optical fiber precast rod refractivity 1;
(2) select laser instrument 8, the two-dimension translational platform 5 of camera 6, line style light beam output and be furnished with the computing machine 10 of corresponding control software; Computing machine connects laser instrument 8, the two-dimension translational platform 5 of one dimension jacking gear 2, camera 6, the output of line style light beam by data line; The laser instrument 8 of camera 6, the output of line style light beam is fixed on two-dimension translational platform 5 by support 7, support 9 respectively, the line style light beam vertical irradiation preform 1 of laser instrument 8 perpendicular to a surface of rectangular vessel 4, the imaging optical path of camera 6 is perpendicular to preform 1 and perpendicular to line style light beam; The line style light beam of laser instrument 8 and preform 1 intersection are arranged on the object plane of camera 6 imaging systems.
(3) open successively the auto Detection Software in laser instrument 8, camera 6 and computing machine 10; Camera 6 on two-dimension translational platform 5 and laser instrument 8 be with the state operation of bidimensional scanning, makes the line style light beam of laser instrument 8 progressively scan the region at whole preform 1 place; In the process of the line style light beam autoscan of laser instrument 8, camera 6 Real-time Collection pictures, and whether automatic decision preform 1 there is the position of flaw and flaw.Preform flaw detection method based on laser light scattering detects the prefabricated rods flaw obtaining and distributes as shown in Figure 2.
The present invention utilizes the line style light beam irradiates preform of laser instrument, the laser light scattering spot imaging forming with Ear Mucosa Treated by He Ne Laser Irradiation flaw determines that flaw exists, and determines the distributed intelligence of flaw in preform in conjunction with two-dimension translational platform and imaging picture laser light scattering facula position.The present invention has got rid of the shortcoming that efficiency is low, with a low credibility, consistance is poor that artificial observation brings, and has the advantages such as efficiency is high, precision is high, full-automatic.
Claims (1)
1. the preform flaw detection method based on laser light scattering, is characterized in that the method comprises the steps:
Step (1) is vertically fixed on preform to be measured on computer-controlled one dimension jacking gear; Control one dimension jacking gear, preform is immersed in completely in the matching fluid that is contained in rectangular vessel, the refractive index of matching fluid is consistent with optical fiber precast rod refractivity;
Step (2) is selected laser instrument, the two-dimension translational platform of camera, the output of line style light beam and is furnished with the computing machine of corresponding control software; Computing machine connects laser instrument, the two-dimension translational platform of one dimension jacking gear, camera, the output of line style light beam by data line; The laser instrument of camera, the output of line style light beam is fixed on two-dimension translational platform by support, the line style light beam vertical irradiation preform of laser instrument perpendicular to a surface of rectangular vessel, the imaging optical path of camera is perpendicular to preform and perpendicular to line style light beam; The line style light beam of laser instrument and preform intersection are arranged on the object plane of camera imaging system;
Step (3) is opened laser instrument and camera successively; Auto Detection Software in its Computer, the camera on two-dimension translational platform and laser instrument be with the state operation of bidimensional scanning, makes the line style light beam of laser instrument progressively scan the region at whole preform place; In the process of the line style light beam autoscan of laser instrument, camera Real-time Collection picture, and whether automatic decision preform there is flaw and determines the position of flaw;
In the time of the line style light beam irradiates preform of laser instrument, if corresponding irradiation area does not have the flaw of bubble or impurity, laser experience uniform dielectric, does not observe laser light scattering spot in the picture after camera imaging; If corresponding irradiation area has the flaw of bubble or impurity, due to laser light scattering, in picture after camera imaging, will observe laser light scattering spot, according to the position of the position of laser light scattering spot in picture and the scanning of two-dimension translational platform, can judge the concrete three-dimensional position of preform flaw; When the line style light beam of laser instrument progressively scans behind the region at whole preform place, computing machine can obtain the distributed intelligence of whole preform flaw.
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| CN201410014164.XA CN103698342A (en) | 2014-01-09 | 2014-01-09 | Laser scattering-based optical-fiber prefabricated rod defect detection method |
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Cited By (14)
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| CN105842202A (en) * | 2016-05-03 | 2016-08-10 | 暨南大学 | Multichannel optical element surface particle scattering measuring system and method |
| CN108885182A (en) * | 2016-03-24 | 2018-11-23 | 住友电气工业株式会社 | The manufacturing method of optical fiber inspection device, fiber fabrication apparatus, the inspection method of optical fiber and optical fiber |
| CN109060816A (en) * | 2018-06-13 | 2018-12-21 | 中国科学院上海光学精密机械研究所 | Fast detection device for defects of membrane and method in heavy-calibre element body |
| CN109163884A (en) * | 2018-10-29 | 2019-01-08 | 武汉理工大学 | A kind of Optical fibre parametric measurement system and method |
| CN109862256A (en) * | 2018-12-25 | 2019-06-07 | 武汉凌云光电科技有限责任公司 | A kind of device and localization method of vision positioning band fibre |
| CN111024676A (en) * | 2020-01-10 | 2020-04-17 | 河南工程学院 | Novel nonlinear Z-scan measuring method and device |
| CN111175306A (en) * | 2020-01-31 | 2020-05-19 | 武汉大学 | Automatic bubble detection system and method for optical fiber preform based on machine vision |
| CN111458348A (en) * | 2020-04-09 | 2020-07-28 | 李林杰 | Bubble detection device and method for optical fiber preform |
| CN112033977A (en) * | 2020-08-04 | 2020-12-04 | 太原理工大学 | Automatic detection and accurate positioning device and method for bubble defects in sapphire crystal bar |
| CN112595720A (en) * | 2020-12-21 | 2021-04-02 | 藤仓烽火光电材料科技有限公司 | System for detecting loose body based on laser interference imaging |
| CN113588665A (en) * | 2021-08-05 | 2021-11-02 | 上海大学 | Method for realizing defect detection of optical fiber preform based on machine vision |
| CN113793303A (en) * | 2021-08-23 | 2021-12-14 | 汕头大学 | Water leakage detection method and system based on image processing |
| CN113920090A (en) * | 2021-10-13 | 2022-01-11 | 无锡雪浪数制科技有限公司 | Preform appearance defect automatic detection method based on deep learning |
| CN115353283A (en) * | 2022-09-09 | 2022-11-18 | 中国建筑材料科学研究总院有限公司 | Optical fiber image transmission element and preparation method and application thereof |
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- 2014-01-09 CN CN201410014164.XA patent/CN103698342A/en active Pending
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| CN108885182A (en) * | 2016-03-24 | 2018-11-23 | 住友电气工业株式会社 | The manufacturing method of optical fiber inspection device, fiber fabrication apparatus, the inspection method of optical fiber and optical fiber |
| CN105842202A (en) * | 2016-05-03 | 2016-08-10 | 暨南大学 | Multichannel optical element surface particle scattering measuring system and method |
| CN109060816A (en) * | 2018-06-13 | 2018-12-21 | 中国科学院上海光学精密机械研究所 | Fast detection device for defects of membrane and method in heavy-calibre element body |
| CN109060816B (en) * | 2018-06-13 | 2021-09-07 | 中国科学院上海光学精密机械研究所 | Device and method for rapidly detecting defects in large-caliber element body |
| CN109163884A (en) * | 2018-10-29 | 2019-01-08 | 武汉理工大学 | A kind of Optical fibre parametric measurement system and method |
| CN109862256B (en) * | 2018-12-25 | 2020-10-27 | 武汉凌云光电科技有限责任公司 | Device and method for visually positioning belt fiber |
| CN109862256A (en) * | 2018-12-25 | 2019-06-07 | 武汉凌云光电科技有限责任公司 | A kind of device and localization method of vision positioning band fibre |
| CN111024676A (en) * | 2020-01-10 | 2020-04-17 | 河南工程学院 | Novel nonlinear Z-scan measuring method and device |
| CN111175306A (en) * | 2020-01-31 | 2020-05-19 | 武汉大学 | Automatic bubble detection system and method for optical fiber preform based on machine vision |
| CN111175306B (en) * | 2020-01-31 | 2021-04-02 | 武汉大学 | Automatic bubble detection system and method for optical fiber preform based on machine vision |
| CN111458348A (en) * | 2020-04-09 | 2020-07-28 | 李林杰 | Bubble detection device and method for optical fiber preform |
| CN111458348B (en) * | 2020-04-09 | 2024-01-26 | 李林杰 | Bubble detection device and detection method for optical fiber preform |
| CN112033977A (en) * | 2020-08-04 | 2020-12-04 | 太原理工大学 | Automatic detection and accurate positioning device and method for bubble defects in sapphire crystal bar |
| CN112595720A (en) * | 2020-12-21 | 2021-04-02 | 藤仓烽火光电材料科技有限公司 | System for detecting loose body based on laser interference imaging |
| CN113588665A (en) * | 2021-08-05 | 2021-11-02 | 上海大学 | Method for realizing defect detection of optical fiber preform based on machine vision |
| CN113793303A (en) * | 2021-08-23 | 2021-12-14 | 汕头大学 | Water leakage detection method and system based on image processing |
| CN113793303B (en) * | 2021-08-23 | 2023-11-14 | 汕头大学 | Water leakage detection method and system based on image processing |
| CN113920090A (en) * | 2021-10-13 | 2022-01-11 | 无锡雪浪数制科技有限公司 | Preform appearance defect automatic detection method based on deep learning |
| CN113920090B (en) * | 2021-10-13 | 2022-08-30 | 无锡雪浪数制科技有限公司 | Prefabricated rod appearance defect automatic detection method based on deep learning |
| CN115353283A (en) * | 2022-09-09 | 2022-11-18 | 中国建筑材料科学研究总院有限公司 | Optical fiber image transmission element and preparation method and application thereof |
| CN115353283B (en) * | 2022-09-09 | 2023-08-15 | 中国建筑材料科学研究总院有限公司 | Optical fiber image transmission element, preparation method and application thereof |
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