| 一种提高粒子再现像对比度的方法 |
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| 引用本文： | 李志斌,郑刚,章立新.一种提高粒子再现像对比度的方法[J].激光技术,2010,34(1):112-115. |
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| 作者姓名： | 李志斌 郑刚 章立新 |
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| 作者单位： | 1.上海理工大学, 光学与电子信息工程学院, 上海, 200093; |
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| 摘 要： | 在对3维粒子场全息图的数值重构过程中,为了提高和改善聚焦粒子再现像的对比度,减小直透光、孪生像以及离焦粒子像的影响,采用了1种数值处理方法,通过对数值重构出的2个聚焦与非聚焦面上粒子复振幅相减,可以将直透光、孪生像和离焦粒子像对聚焦粒子的影响同时减小,并给出了简要理论以及仿真、实验结果。结果表明,在同轴数字全息层析再现粒子场过程中,该方法适用于在某一聚焦面仅显示聚焦粒子;此外,该过程仅需要一张全息图,而且不需要对全息图做预前和后期处理。
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| 关 键 词： | 全息 同轴数字全息 焦深 粒子分析 离焦像 |
| 收稿时间： | 2008-10-09 |
| 修稿时间： | 2008-12-14 |
a Method of enhancing reconstructed particle image contrast in in-line digital holography |
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| LI Zhi-bin,ZHENG Gang,ZHANG Li-xin.a Method of enhancing reconstructed particle image contrast in in-line digital holography[J].Laser Technology,2010,34(1):112-115. |
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| Authors: | LI Zhi-bin ZHENG Gang ZHANG Li-xin |
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| Abstract: | In-line digital holography is presented for the particles analysis in 3-D. When a reconstruction is performed on a digital holographic image that contains small particles at different depths, diffraction that is due to zero order wave, conjugate image wave, and defocused images disrupt the visibility of the nearby focused particles in in-line digital holography. In this paper we propose a numerical method to reduce these effects. We present a new subtraction method of reconstructed wave fields for particles analysis. The effects of zero order term, conjugate image wave and more importantly the out-of-focus particles are simultaneously minimized, and thus improve the contrast of recon-structed amplitude images. This method is useful to slice in-line digital holograms to display only in-focus particles at any particular plane. Furthermore all this is accomplished from a single hologram with no additional pre or post proc-essing required. The theoretical aspects of the method are presented, and results for simulated and experimental exam-ples are shown. |
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| Keywords: | holography in-line digital holography depth of focus particle analysis defocused image |
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