摘要
提出了一种基于数字光栅投影的浮法玻璃缺陷检测方法。由数字投影仪投射的光栅条纹经过玻璃带在背景平面上成像,用位于玻璃带上方的高速相机采集受到玻璃带表面调制的图像,再由计算机对采集到的缺陷图像进行相位提取和重建,得到受玻璃缺陷调制的离面位移分布图,并计算求出玻璃带表面的屈光度。以检测难度较大的光畸变缺陷为例,验证了本文方法的可行性。实验结果表明,本文方法能检测光学变形较小的缺陷,检测精度可以达到0.1mm。
As the defects seriously affect the quality grade of float glass, the on-line defect detection tech- nology is important for improving the quality of glass products. This paper presents an on-line defects de- tection method for float glass based on digital fringe projection profilometry. Firstly, the digital projector and the high-speed camera are placed on the upper side of glass sheet which is moving on the production line, the digital projector projects fringe through the glass sheet and images it on the background, and the camera captures the fringe image which is modulated by glass surface. The glass defects would change the phase distribution of fringe image, then the image processing computer extracts and reconstructs the phase information of the collected defect image which is out of shape,the out of plane displacement can be obtained by mathematical relationship, and finally the diopter of defects glass can be calculated. This method has been applied to the float glass defect detection filed, and can successfully detect the optical distortion defects which are difficulty for other traditional methods. The experiment results show that the digital fringe projection method can detect the smaller optical distortion defects, and the detection accura- cy can reach 0.1 mm.
出处
《光电子．激光》
EI
CAS
CSCD
北大核心
2014年第3期521-525,共5页
Journal of Optoelectronics·Laser
基金
国家自然科学基金(61201412)
山西省回国留学基金资助项目
