基于蓝光扫描仪的高光面小圆角结构测量方法
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摘要
对于高光表面及小圆角结构工件,传统的光学测量方法以及设备难以满足工程要求,基于蓝光扫描仪,提出一种球心偏置测量方法。在待测工件表面附着经220目砂粒喷砂处理的钢球,利用蓝光扫描仪对钢球进行快速扫描并拟合出扫描点云的球心点,沿待测工件表面法矢方向偏置钢球半径可得到工件表面实测点。利用该方法对标准圆棒进行测量,拟合直径差值为0.000 2mm,测量精度在0.03mm以内,验证了该方法原理的可行性。以进排气边圆角R<0.1mm的抛光叶片某条截面线为例,测量精度在0.03mm以内。该方法不受待测工件表面材质影响,对于高反光表面以及具有微小结构特征工件的测量具有重要意义。
For high reflective surface and small fillet structural workpiece,traditional optical measurement methods and equipment are difficult to meet engineering requirements.A spherical center offset measurement method was proposed based on the blue light scanner.We made sandtreated steel balls adhere to the workpiece and scanned the steel balls by using blue light scanner.Then we fitted the sphere center of the point cloud and offset the sphere radius along the normal direction of the workpiece surface to obtain the actual workpiece point.The standard cylinder's fitting-diameter-deviation is 0.000 2 mm and the measurement accuracy is less than0.03 mm by using the method.The result proves the feasibility of the method.Taking a section of polishing blade which fillet radius of inlet and exhaust edge is less than 0.1 mm as an example,the measurement accuracy is within 0.03 mm.This method is not affected by the workpiece material and it has great significance for the measurement of the workpiece which has high reflective surface and small fillet feature.
For high reflective surface and small fillet structural workpiece,traditional optical measurement methods and equipment are difficult to meet engineering requirements.A spherical center offset measurement method was proposed based on the blue light scanner.We made sandtreated steel balls adhere to the workpiece and scanned the steel balls by using blue light scanner.Then we fitted the sphere center of the point cloud and offset the sphere radius along the normal direction of the workpiece surface to obtain the actual workpiece point.The standard cylinder's fitting-diameter-deviation is 0.000 2 mm and the measurement accuracy is less than0.03 mm by using the method.The result proves the feasibility of the method.Taking a section of polishing blade which fillet radius of inlet and exhaust edge is less than 0.1 mm as an example,the measurement accuracy is within 0.03 mm.This method is not affected by the workpiece material and it has great significance for the measurement of the workpiece which has high reflective surface and small fillet feature.
引文
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[2]ZHANG Song.Handbook of 3Dmachine vision[M].France:CRC Oress,2013.
[3]彭翔,殷永凯,刘晓利,等.基于相位辅助的三维数字成像与测量[J].光学学报,2011,31(9):181-193.PENG Xiang,YIN Yongkai,LIU Xiaoli,et al.3Ddig-ital image and measurement based on phase aided[J].Acta Optica Sinica,2011,31(9):181-193.
[4]杨杰.复杂较大物体高精度三维测量方法的研究[D].南昌:南昌航空大学,2015:10-12.YANG Jie.Research on high-accuracy 3D measure-ment method for complex large objects[D]..Nan-chang:Nanchang Hangkong University,2015:10-12.
[5]GORTHI S S,RASTOGI P.Fringe projection tech-niques:Whither we are?[J].Optics &Lasers in En-gineering,2010,48(2):133-140.
[6]CHEN F,BROWN G M,SONG M.Overview of three-dimensional ahape measurement using optical methods[J].Optical Engineering,2000,39(1):10-22.
[7]SALVI J,PAGèS J,BATLLE J.Pattern codificationstrategies in structured light systems[J].PatternRecognition,2004,37(4):827-849.
[8]WANG Liu,CHENG Chao,GAO Nan,et al.Three-dimensional shape measurement of high reflective ob-jects based on adaptive fringe-pattern projection[J].Journal of Applied Optics,2018,39(3):373-378.王柳,陈超,高楠,张宗华.基于自适应条纹投影的高反光物体三维面形测量[J].应用光学,2018,39(3):373-378.
[9]YOSHINORI Y,HIROYUKI M,OSAMU N,et al.Shape measurement of glossy objects by range finderwith polarization optical system[J].Gazo DenshiGakkai Kenkyukai Koen Yoko,2003,200:43-50.
[10]HU Q,HARDING K G,DU X,et al.Shiny partsmeasurement using color separation[J].SPIE:TheInternational Society for Optical Engineering,2005,6000:125-132.
[11]ZHANG S,YAU S T.High dynamic range scanningtechnique[C]//Two-and three-dimensional methodsfor inspection and metrology VI.USA:InternationalSociety for Optics and Photonics,2008:033604.
[12]FENG S,ZHANG Y,CHEN Q,et al.General solu-tion for high dynamic range three-dimensional shapemeasurement using the fringe projection technique[J].Optics &Lasers in Engineering,2014,59(59):56-71.
[13]XING Wei,ZHANG Fumin,FENG Wei,et al.Three-dimensional measurement method of objects withspecular surface based on digital micromirror device[J].Acta Optica Sinica,2017,37(12):193-199.邢威,张福民,冯维,等.基于数字微镜器件的高光面物体三维测量方法[J].光学学报,2017,37(12):193-199.
[14]WU Lijuan,LIU Guihua,LIU Xianyong,et al.Three-dimensional measurement method of specular surfacebased on structured light technology[J].Tool Engi-neering,2011,45(3):88-92.吴丽娟,刘桂华,刘先勇,等.基于结构光技术的高光表面三维测量方法[J].工具技术,2011,45(3):88-92.
[15]ZHANG Dehai.3Ddigital modeling and reverse engi-neering[M].Beijing:Beijing University Press,2016:130-131.张德海.三维数字化建模与逆向工程[M].北京:北京大学出版社,2016:130-131.
[16]LI Y D,GU P H.Free-form surface inspection tech-niques state of the art review[J].Computer-AidedDesign,2004,36(13):1395-1417.
[17]LI Quan,CHENG Xiaojun.Investigating hand-heldlaser scanner accuracy[J].Bulletin of Surveying andMapping,2016,45(10):65-68.李泉,程效军.自定位手持式三维激光扫描仪精度测试与分析[J].测绘通报,2016,45(10):65-68.