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本文分析了刀口纹影技术显示高速流逝现象如火焰、燃烧、击波和流动等的局限性,并根据色度学颜色混合定律,设计了三色彩环滤波片代替典型纹影系统中的刀口,和用直径1毫米的小孔代替狭缝,获得了扰动场的彩色纹影图象。根据一次摄影得到的纹影象的色度变化可得到扰动场引起的光线偏折量,由此可对高速扰动场的物理特性作出简单可靠的定性评价和一定条件下可作出定量评价。文章通过实验,用直接摄影、刀口纹影、彩条彩色纹影和彩环彩色纹影四种方法,分别对代表稳定扰动场的透明不均匀材料和酒精灯火焰进行拍摄,并作了比较分析,得出彩环彩色纹影可在二维平面内的全向指示偏折量。
In this paper, the limitation of high speed lapse phenomena such as flame, combustion, shock wave and flow is analyzed. The three-color ring filter is designed to replace the blade edge in the typical shadowing system according to the color mixing law of chromaticity. And replacing the slit with a hole of 1 mm in diameter, a color image of the disturbing field is obtained. According to the change of the chromaticity of the image obtained by one photography, the amount of light deflection caused by the disturbance field can be obtained, which can make the simple and reliable qualitative evaluation of the physical characteristics of the high-speed disturbance field and the quantitative evaluation under certain conditions. In this paper, four kinds of methods, direct photography, knife edge shadow, color stripe and colored ring, were used to photograph the transparent heterogeneous material and the alcohol lamp flames, respectively, which were representative of steady disturbance field. The comparative analysis , Draw color ring color can be bi-directional in the two-dimensional plane deflection instructions.