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A novel 3-D temperature field reconstruction method is proposed in this paper, which is based on multi-wavelength thermometry and Hopfield neural network computed tomography. A mathematical model of multi-wavelength thermometry is founded, and a neural network algorithm based on multiobjective optimization is developed. Through computer simulation and comparison with the algebraic reconstruction technique (ART) and the filter back-projection algorithm (FBP), the reconstruction result of the new method is discussed in detail. The study shows that the new method always gives the best reconstruction results. At last, temperature distribution of a section of four peaks candle flame is reconstructed with this novel method. 相似文献
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基于多角度再现的分层次一步彩虹全息 总被引:1,自引:0,他引:1
提出了一种利用一步彩虹全息术记录多幅二维图像的全息显示技术,它既能实现在同一记录介质中记录多个角度再现的彩虹全息图,又能获得分层次的效果,全息图白光再现时具有低的散斑噪声和高的衍射效率。 相似文献
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掩模分形提高光刻边缘锐度的研究 总被引:2,自引:2,他引:0
针对电寻址空间光调制器制作灰度掩模过程中,精缩透镜的低通滤波特性导致灰度掩模边缘锐度下降的问题,提出了掩模分形技术。对一幅高频灰阶掩模图形,按固定的或可变的低频采样。低频掩模的每个周期中,只包含原掩模图形多个周期中的一个抽样。通过实时掩模技术,将多个低频掩模按顺序曝光,从而恢复出原高频掩模图形。制作二元光栅时,分形掩模技术可使透镜造成的高频能量相对损失由35、23%降低至6.09%,同时,可将部分低频能量搬迁至中高频,较好地改善了灰阶掩模图形的边缘锐度。分形掩模还可以变多灰阶复杂掩模为简单的二元掩模,简化掩模的设计与实现,同时消除屏幕刷新率对掩模制作的影响。 相似文献
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