高通滤波器尺寸对粒子离轴滤波全息像的影响

发布时间：2018-04-30 01:36

本文选题：全息 + 离轴全息　；参考：《激光与光电子学进展》2017年06期

【摘要】：粒子场离轴滤波全息技术是减少背景噪声影响、改善粒子场再现像质量的有效方法。滤波器尺寸与再现粒子像密切相关,合适的滤波器尺寸有利于粒子的识别和测量。解析分析了高通滤波器尺寸、4F系统前焦距及粒径对圆形粒子离轴滤波全息再现像强度分布的影响规律,数值模拟了不同尺寸的高通滤波器对相同粒径粒子全息再现像强度分布的影响,并开展了离轴滤波全息实验。研究结果表明,高通滤波器可以有效提高粒子图像的对比度;粒子尺寸不变时,滤波器尺寸越小或4F系统前焦距越大,再现粒子像强度分布越均匀,同时边界梯度越大;滤波器尺寸和4F系统前焦距恒定时,粒子越大,再现粒子像内部逐渐呈现明暗相间变化的圆环,同时粒子边界越来越清晰。
[Abstract]:Particle field off-axis filter holography is an effective method to reduce background noise and improve the image quality of particle field reconstruction. The size of the filter is closely related to the reconstructed particle image, and the appropriate size of the filter is helpful for particle recognition and measurement. The influence of front focal length and particle size on the intensity distribution of circular particle off-axis filter holographic reconstruction image is analytically analyzed. The effects of high-pass filters of different sizes on the intensity distribution of holographic reconstruction images with the same particle size are numerically simulated, and off-axis filtering holographic experiments are carried out. The results show that the high pass filter can effectively improve the contrast of particle image, the smaller the size of the filter is or the larger the front focal length of 4F system is, the more uniform the intensity distribution of the reconstructed particle image is and the larger the boundary gradient is. When the size of the filter and the front focal length of the 4F system are constant, the larger the particle size is, the larger the particle size is, and the larger the particle size is, the larger the particle size is, and the larger the particle size is, the larger the particle size is.
【作者单位】：湘潭大学材料科学与工程学院;西北核技术研究所强脉冲辐射环境模拟与效应国家重点实验室;
【分类号】：O438.1;TN713

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