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Measurement of Free-Form Curved Surfaces Using Laser Triangulation
Laser triangulation (LT) is widely used in many fields due to its good stability, high resolution and fast speed. However, the accuracy in these applications suffers from severe constraints on the data acquisition accuracy of LT. To solve this problem, the optical triangulation principle, the object...
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Published in: | Sensors (Basel, Switzerland) Switzerland), 2018-10, Vol.18 (10), p.3527 |
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description | Laser triangulation (LT) is widely used in many fields due to its good stability, high resolution and fast speed. However, the accuracy in these applications suffers from severe constraints on the data acquisition accuracy of LT. To solve this problem, the optical triangulation principle, the object equation of the optical path relationship and the deviation of the laser spot centroid are applied to deduce a mathematical model. Therefore, the image sensor inclination errors can be quantitatively calculated, and the collected data are compensated in real time. Further, a threshold sub-pixel gray-gravity (GG) extraction algorithm is proposed; the gradient function and Gaussian fit algorithm are used to set thresholds to remove the impact of the spot edge noise area on the center location; and polynomial interpolation is employed to enhance the data density of the traditional GG method, thus improving the data acquisition accuracy of LT. Finally, the above methods are applied to on-machine measurement of the American Petroleum Institute (API) thread and the screw rotor, respectively. The experimental results prove that the proposed method can significantly improve the measurement accuracy of free-form curved surfaces using LT and that the improved laser spot center extraction algorithm is more suitable for free-form curved surfaces with smaller curvature and more uniform curvature changes. |
doi_str_mv | 10.3390/s18103527 |
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However, the accuracy in these applications suffers from severe constraints on the data acquisition accuracy of LT. To solve this problem, the optical triangulation principle, the object equation of the optical path relationship and the deviation of the laser spot centroid are applied to deduce a mathematical model. Therefore, the image sensor inclination errors can be quantitatively calculated, and the collected data are compensated in real time. Further, a threshold sub-pixel gray-gravity (GG) extraction algorithm is proposed; the gradient function and Gaussian fit algorithm are used to set thresholds to remove the impact of the spot edge noise area on the center location; and polynomial interpolation is employed to enhance the data density of the traditional GG method, thus improving the data acquisition accuracy of LT. Finally, the above methods are applied to on-machine measurement of the American Petroleum Institute (API) thread and the screw rotor, respectively. 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The experimental results prove that the proposed method can significantly improve the measurement accuracy of free-form curved surfaces using LT and that the improved laser spot center extraction algorithm is more suitable for free-form curved surfaces with smaller curvature and more uniform curvature changes.</description><subject>free-form curved surface</subject><subject>laser spot</subject><subject>laser triangulation</subject><subject>on-machine measurement</subject><issn>1424-8220</issn><issn>1424-8220</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2018</creationdate><recordtype>article</recordtype><sourceid>DOA</sourceid><recordid>eNpVkU1v1DAQhi1URD_gwB9AOZZDiu2x4-SCRFddqLSIA-3ZmtjjJVUSFztZiX_ftFtW7WlGM-88M6OXsY-CXwA0_EsWteCgpXnDToSSqqyl5Ecv8mN2mvMd5xIA6nfsGDgorgBO2OVPwjwnGmicihiKdSIq1zENxWpOO_LF7zkFdJSL29yN22KDmVJxkzoct3OPUxfH9-xtwD7Th-d4xm7XVzerH-Xm1_fr1bdN6ZQSUxmw9m2rqfWkKoRGaiERlHNLRQlXK6N5JdpAJohg0LgWjBcN6FZJI6sWztj1nusj3tn71A2Y_tmInX0qxLS1mKbO9WS5Ru89ChMgKFAapeFa1pUOBK6SfGF93bPu53Yg75bvE_avoK87Y_fHbuPOLsNNw80COH8GpPh3pjzZocuO-h5HinO2UkgwkleNXqSf91KXYs6JwmGN4PbRP3vwb9F-ennXQfnfMHgAE56VWg</recordid><startdate>20181018</startdate><enddate>20181018</enddate><creator>Dong, Zhixu</creator><creator>Sun, Xingwei</creator><creator>Liu, Weijun</creator><creator>Yang, Heran</creator><general>MDPI</general><general>MDPI AG</general><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7X8</scope><scope>5PM</scope><scope>DOA</scope></search><sort><creationdate>20181018</creationdate><title>Measurement of Free-Form Curved Surfaces Using Laser Triangulation</title><author>Dong, Zhixu ; Sun, Xingwei ; Liu, Weijun ; Yang, Heran</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c441t-fa8dbb5ebde46a392512a34ccebd41c8475061bfe7f1f7a7cb37d1935b42726b3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2018</creationdate><topic>free-form curved surface</topic><topic>laser spot</topic><topic>laser triangulation</topic><topic>on-machine measurement</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Dong, Zhixu</creatorcontrib><creatorcontrib>Sun, Xingwei</creatorcontrib><creatorcontrib>Liu, Weijun</creatorcontrib><creatorcontrib>Yang, Heran</creatorcontrib><collection>PubMed</collection><collection>CrossRef</collection><collection>MEDLINE - Academic</collection><collection>PubMed Central (Full Participant titles)</collection><collection>Open Access: DOAJ - Directory of Open Access Journals</collection><jtitle>Sensors (Basel, Switzerland)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Dong, Zhixu</au><au>Sun, Xingwei</au><au>Liu, Weijun</au><au>Yang, Heran</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Measurement of Free-Form Curved Surfaces Using Laser Triangulation</atitle><jtitle>Sensors (Basel, Switzerland)</jtitle><addtitle>Sensors (Basel)</addtitle><date>2018-10-18</date><risdate>2018</risdate><volume>18</volume><issue>10</issue><spage>3527</spage><pages>3527-</pages><issn>1424-8220</issn><eissn>1424-8220</eissn><abstract>Laser triangulation (LT) is widely used in many fields due to its good stability, high resolution and fast speed. However, the accuracy in these applications suffers from severe constraints on the data acquisition accuracy of LT. To solve this problem, the optical triangulation principle, the object equation of the optical path relationship and the deviation of the laser spot centroid are applied to deduce a mathematical model. Therefore, the image sensor inclination errors can be quantitatively calculated, and the collected data are compensated in real time. Further, a threshold sub-pixel gray-gravity (GG) extraction algorithm is proposed; the gradient function and Gaussian fit algorithm are used to set thresholds to remove the impact of the spot edge noise area on the center location; and polynomial interpolation is employed to enhance the data density of the traditional GG method, thus improving the data acquisition accuracy of LT. Finally, the above methods are applied to on-machine measurement of the American Petroleum Institute (API) thread and the screw rotor, respectively. The experimental results prove that the proposed method can significantly improve the measurement accuracy of free-form curved surfaces using LT and that the improved laser spot center extraction algorithm is more suitable for free-form curved surfaces with smaller curvature and more uniform curvature changes.</abstract><cop>Switzerland</cop><pub>MDPI</pub><pmid>30340433</pmid><doi>10.3390/s18103527</doi><oa>free_for_read</oa></addata></record> |
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subjects | free-form curved surface laser spot laser triangulation on-machine measurement |
title | Measurement of Free-Form Curved Surfaces Using Laser Triangulation |
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