###
工程科学与技术:2022,54(4):235-243
←前一篇   |   后一篇→
本文二维码信息
码上扫一扫!
基于高速相位调制的菲涅耳场相位恢复
(1.安徽大学 计算智能与信号处理教育部重点实验室,安徽 合肥 230039;2.国防科技大学 先进激光技术安徽省实验室,安徽 合肥 230037)
Fresnel Field Phase Retrieval via High-speed Phase Modulation
(1.Key Lab. of Computational Intelligence and Signal Processing, Ministry of Education, Anhui Univ., Hefei 230039, China;2.Advanced Laser Technol. Lab. of Anhui Province, National Univ. of Defense Technol., Hefei 230037, China)
摘要
图/表
参考文献
相似文献
本文已被:浏览 225次   下载 97
投稿时间:2021-04-22    修订日期:2022-03-30
中文摘要: 多强度相位恢复方法通过改变光学成像系统中的物理参数获得不同的编码衍射图案,无需额外的先验知识即可实现相位的最佳收敛和高精度重建,然而现有多强度相位恢复方法在获取不同测量值的过程中,往往需要不断改变成像系统的物理结构,需要精确移动或调整部分光学元件的空间位置,反复地对齐与校准显著增加了工作量,从而导致成像结构较为复杂。针对上述问题,本文提出基于高速相位调制的菲涅耳场编码衍射图案实时获取方法,该方法主要使用电可调透镜(ETL)或纯相位型硅基液晶(PLCoS)两种纯相位空间光调制器来进行相位的快速动态调制,通过自由空间传播到记录平面,由探测器获取强度信息,无需使用透镜装置或者改变成像系统的物理结构,最后使用WF算法从获取的多幅编码衍射图案中同时重建光场的振幅和相位。通过对远场(FF)和菲涅耳场(FrF)在不同迭代次数、不同掩膜数量、不同噪声水平以及不同算法下分别进行对比实验,验证了本文方法的有效性和鲁棒性。相比于传统多强度相位恢复方法,本文所提出的成像系统更为紧凑和简单,避免了反复对齐与校准的工作量,具有重要的应用潜力,尤其是电可调透镜(ETL)调制系统,可适用于高分辨率场景的高速记录。
中文关键词: 多强度  相位调制  菲涅耳场  相位恢复
Abstract:The multi-intensity phase retrieval methods obtain different coded diffraction patterns by changing the physical parameters in the optical imaging system, which can achieve the best convergence of phase and high-precision reconstruction without additional prior knowledge. However, the existing multi-intensity phase retrieval methods often need to constantly change the physical structure of the imaging system and accurately move or adjust the spatial position of some optical elements in the process of obtaining different measurements. The repeated alignment and calibration significantly increase the workload, resulting in more complex imaging structure. To solve the above problems, a real-time acquisition method of Fresnel field coded diffraction pattern based on high-speed phase modulation was proposed in this paper. In the method, two pure phase spatial light modulators: electrically tunable lens (ETL) and pure phase silicon-based liquid crystal (PLCoS) were mainly used to perform the fast dynamic phase modulation. The phase was transmitted to the recording plane through free space, and the intensity information was obtained by the detector without using a lens or changing the physical structure of the imaging system. The WF algorithm was used to simultaneously reconstruct the amplitude and phase of the light field from multiple coded diffraction patterns. In the paper, the effectiveness and robustness of the proposed method were verified by the contrast experiments of farfield (FF) and Fresnel field (FrF) under different iteration times, different mask numbers, different noise levels and different algorithms. Compared with the traditional multi-intensity phase retrieval methods, the proposed imaging system is more compact and simple. It avoids the workload of repeated alignment and calibration, and has important application potentials. Especially, the electrically tunable lens (ETL) modulation scheme can be applied to high-speed recording of high-resolution scenes.
文章编号:202100363     中图分类号:O436    文献标志码:
基金项目:国家自然科学基金项目(61501001;61301296;61605002);安徽省先进激光技术实验室开放基金项目(AHL2020KF05);安徽省自然科学基金项目(2008085MF209);安徽省教育厅重大项目(KJ2019ZD04;KJ2020ZD02)
作者简介:第一作者:张成(1984-),男,副教授,博士.研究方向:光学成像;相位恢复;信号与信号处理.E-mail:641732816@qq.com;通信作者:张莉茹,E-mail:944624188@qq.com
引用文本:
张成,张莉茹,朱进兵,江劲波,韦穗.基于高速相位调制的菲涅耳场相位恢复[J].工程科学与技术,2022,54(4):235-243.
ZHANG Cheng,ZHANG Liru,ZHU Jinbing,JIANG Jinbo,WEI Sui.Fresnel Field Phase Retrieval via High-speed Phase Modulation[J].Advanced Engineering Sciences,2022,54(4):235-243.