In this paper, in view of the on-line inspection of the thickness of steel plate and its surface defects, a quality inspection system for appearance of steel is designed. The moire image on the surface of the steel plate is collected by a linear CCD camera. The fringe image is transformed by wavelet transform, and the phase information of wavelet transform coefficients corresponding to the wavelet ridge is extracted to reconstruct the 3D profile. Experimental results show that the thickness measurement precision of the steel plate is 0.08 mm and the measurement accuracy of the surface defect is 0.2 mm. The online detection speed is 6 m/s. The on-line detection of thickness and surface defect of steel plate can be realized.
Design of inspection system for exterior quality of steel plate
First published at:Jul 01, 2018
1 Wu Y. Application of stainless steel and analysis of surface treatment technology[J]. China Plant Engineering, 2017(13): 105–106. DOI:10.3969/j.issn.1671-0711.2017.13.047
吴洋.不锈钢应用及其表面处理技术分析[J].中国设备工程, 2017(13): 105–106. DOI:10.3969/j.issn.1671-0711.2017.13.047
2 Zhang H, Zhang Y J, Han J T, et al. Bright line defects of hot rolled plate for 2205 duplex stainless steel[J]. Applied Mechanics and Materials, 2014, 470: 15–18.
3 Li W B, Zhang Q Z, Sun J L, et al. Review of vision inspection technology for surface defect of steel bar[J]. Applied Mechanics and Materials, 2015, 740: 543–546. DOI:10.4028/www.scientific.net/AMM.740
4 Soni A K, Sasi B, Thirunavukkarasu S, et al. Development of eddy current probe for detection of deep sub-surface defects[J]. IETE Technical Review, 2015, 33(4): 386–395.
5 Zhu Q F, Zhang X Y, Li D A. Application of X-ray measuring technique in hot strip mill[J]. Nondestructive Testing, 2008, 30(5): 321–323.
6 Song Y H, Wang Z, Fu L H, et al. Improved illumination for steel ball surface inspection system[J]. Opto-Electronic Engineering, 2016, 43(11): 13–18, 25. DOI:10.3969/j.issn.1003-501X.2016.11.003
宋宇航, 王仲, 付鲁华, 等.钢球表面质量视觉检测仪照明系统优化[J].光电工程, 2016, 43(11): 13–18, 25. DOI:10.3969/j.issn.1003-501X.2016.11.003
7 An D, Chen L, Ding Y F, et al. Optical system model and calibration of grating projection phase method[J]. Chinese Optics, 2015, 8(2): 248–254.
8 Liang M, Zhang Z B, Zhong J G. Phase unwrapping guided by instantaneous frequency for wavelet transform profilometry[J]. Journal of Optoelectronics·laser, 2016, 27(8): 853–862.
9 Tao W, Li W R, Zhang D, et al. A selection of wavelet basis function in tem signal processing based on wavelet transform[J]. China's Manganese Industry, 2016, 34(6): 175–176.
10 Xu D Y, Li S K, Wang X Z, et al. Wavelet ridge extraction method employing a cost function in two-dimensional wavelet transform profilometry[J]. Acta Optica Sinica, 2016, 36(4): 0412006.
11 Huang H, Da F P. Novel phase unwrapping method for wavelet profilometry[J]. Chinese Journal of Scientific Instrument, 2012, 33(2): 397–404.
12 Zheng Y, Chen W J, Zhong M, et at. Study of profilometry measurement precision improvement based on morlet wavelet transform[J]. Laser & Optoelectronics Progress, 2014, 51(11):148–155.
13 Zhang T D, Lu R S, Zhang S Z. Surface defect inspection of TFT-LCD panels based on 2D DFT[J]. Opto-Electronic Engineering, 2016, 43(3): 7–15.
14 An D. Research of 3D surface measurement based on digital grating projection[D]. Hefei: Hefei University of Technology, 2015.
Supported by Shanxi Scholarship Council of China (2016-084)
Get Citation: Liu Zhenqi, Jin Yong. Design of inspection system for exterior quality of steel plate[J]. Opto-Electronic Engineering, 2018, 45(7): 180032.