Technique for detecting flaws in metallic surfaces using an optical system with phase-type blazed gratings
Technique for detecting flaws in metallic surfaces using an optical system with phase-type blazed gratings
复制标题
使用相位型闪耀光栅光学系统检测金属表面缺陷的技术
DOI：
10.1080/09500340.2018.1533045
复制
发表时间：
2019
影响因子：
1.3
通讯作者：
and Akira Emoto
中科院分区：
文献类型：
--
作者：
Takuma Ogawa;Takashi Fukuda;and Akira Emoto
在本文中，我们评估了一种新的金属表面的闪烁检测技术的基础上使用的相位型闪耀光栅。通过软纳米压印方法制备透明闪耀光栅，该方法涉及将模板（用于光谱学的反射光栅结构）转移到硅橡胶上。然后将闪耀光栅集成到成像系统中以观察反射金属样品。由于光栅的低通滤波特性，捕获的图像明显模糊。该特性有助于金属表面上的缺陷检测，因为捕获的图像足以基于粗糙表面的纹理区分目标区域中的缺陷，包括任何其他非预期的结构。使用具有交叉光栅矢量的双面光栅被发现对于均匀低通滤波是有效的。由于表面包含粗糙表面和不期望的缺陷，因此这种缺陷检测技术预期可用于对轧制钢板进行质量检查。
In this paper, we evaluate a novel flaw-detection technique for metallic surfaces based on the use of phase-type blazed gratings. Transparent blazed gratings were prepared by the soft nanoimprint method involving the transfer of a template (a reflective grating structure used for spectroscopy) onto silicone rubber. The blazed gratings were then integrated into an imaging system to observe the reflective metal sample. Due to the low-pass-filtering properties of the gratings, the captured image was notably blurred. This characteristic aids in flaw detection on metallic surfaces because the captured image is adequate to distinguish flaws in the targeted area on the basis of the texture of the rough surface, including any other structures that were unintended. The use of double-sided gratings with crossing grating vectors was found to be efficient for homogenous low-pass filtering. Such flaw-detection techniques are expected to be useful for conducting quality inspections of rolled steel plates since the surface contains both a rough surface and undesirable flaws.