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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| Format: | Article |
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MDPI AG
2018-10-01
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| Series: | Sensors |
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| Online Access: | http://www.mdpi.com/1424-8220/18/10/3527 |
| _version_ | 1811263006077616128 |
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| author | Zhixu Dong Xingwei Sun Weijun Liu Heran Yang |
| author_facet | Zhixu Dong Xingwei Sun Weijun Liu Heran Yang |
| author_sort | Zhixu Dong |
| collection | DOAJ |
| 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. |
| first_indexed | 2024-04-12T19:37:07Z |
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| id | doaj.art-05addda17f3f4345a27052865fe3c620 |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-04-12T19:37:07Z |
| publishDate | 2018-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj.art-05addda17f3f4345a27052865fe3c6202022-12-22T03:19:11ZengMDPI AGSensors1424-82202018-10-011810352710.3390/s18103527s18103527Measurement of Free-Form Curved Surfaces Using Laser TriangulationZhixu Dong0Xingwei Sun1Weijun Liu2Heran Yang3School of Mechanical Engineering, Shenyang University of Technology, Shenyang 110870, ChinaSchool of Mechanical Engineering, Shenyang University of Technology, Shenyang 110870, ChinaSchool of Mechanical Engineering, Shenyang University of Technology, Shenyang 110870, ChinaSchool of Mechanical Engineering, Shenyang University of Technology, Shenyang 110870, ChinaLaser 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.http://www.mdpi.com/1424-8220/18/10/3527laser triangulationlaser spotfree-form curved surfaceon-machine measurement |
| spellingShingle | Zhixu Dong Xingwei Sun Weijun Liu Heran Yang Measurement of Free-Form Curved Surfaces Using Laser Triangulation Sensors laser triangulation laser spot free-form curved surface on-machine measurement |
| title | Measurement of Free-Form Curved Surfaces Using Laser Triangulation |
| title_full | Measurement of Free-Form Curved Surfaces Using Laser Triangulation |
| title_fullStr | Measurement of Free-Form Curved Surfaces Using Laser Triangulation |
| title_full_unstemmed | Measurement of Free-Form Curved Surfaces Using Laser Triangulation |
| title_short | Measurement of Free-Form Curved Surfaces Using Laser Triangulation |
| title_sort | measurement of free form curved surfaces using laser triangulation |
| topic | laser triangulation laser spot free-form curved surface on-machine measurement |
| url | http://www.mdpi.com/1424-8220/18/10/3527 |
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