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当激光照射到金属表面时,其反射光形成特有的衍射象,检出这种衍射象的形状和分布就可检测表面的粗糙度状态及其它各种缺陷。本文研制的装置是为了开展自动检测薄纲带表面质量的研究而设计制作的。为了提高扫描光点的分辨率,改善扫描的线性,扫描器采用了扩束装置和F-θ镜头。对扫描器的核心元件——旋转多面镜的设计进行了理论计算,推导了半径和面数的设计公式,并提出了扫描效果的合理取值问题。接收器采用了大面积的圆—直变断面光导纤维传光束。 在实验室对廿辊轧制的薄钢带表面情况进行的检测试验表明,本文介绍的装置可以检测钢带表面上线度在10μ以上的缺陷。
When a laser is applied to a metal surface, the reflected light forms a unique diffraction pattern. The shape and distribution of the diffraction pattern can be detected to detect the surface roughness and various other defects. The device developed in this paper is designed and developed in order to carry out the research on the automatic detection of the surface quality of thin sheet. In order to improve the resolution of the scanning spot and improve the scanning linearity, the scanner uses a beam expander and an F-θ lens. The calculation of the design of the rotating polygon mirror, which is the core element of the scanner, is carried out. The design formulas of the radius and the number of facets are deduced and the reasonable value of the scanning effect is put forward. The receiver uses a large area of circular - direct cross-sectional optical fiber transmission beam. Tests on the surface of the thin strip rolled by 20 rolls in the laboratory show that the device described in this paper can detect defects with a line degree above 10μ on the strip surface.