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Chinese Academy of Sciences Institutional Repositories Grid

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	Inverse electromagnetic obstacle scattering problems with multi-frequency sparse backscattering far field data 期刊论文 OAI收割 Inverse Problems, 2020, 卷号: 36, 期号: 10 作者: Arens,Tilo; Ji,Xia; Liu,Xiaodong \| 收藏 \| 浏览/下载：42/0 \| 提交时间：2021/01/14 electromagnetic obstacle scattering sparse backscattering data uniqueness direct sampling methods
	Inverse elastic scattering problems with phaseless far field data 期刊论文 OAI收割 Inverse Problems, 2019, 卷号: 35, 期号: 11 作者: Ji,Xia; Liu,Xiaodong \| 收藏 \| 浏览/下载：82/0 \| 提交时间：2019/12/13 elastic scattering phaseless far field data uniqueness phase retrieval direct sampling methods
	INVERSE ELECTROMAGNETIC SOURCE SCATTERING PROBLEMS WITH MULTIFREQUENCY SPARSE PHASED AND PHASELESS FAR FIELD DATA 期刊论文 OAI收割 SIAM JOURNAL ON SCIENTIFIC COMPUTING, 2019, 卷号: 41, 期号: 6, 页码: B1368-B1388 作者: Ji, Xia; Liu, Xiaodong \| 收藏 \| 浏览/下载：25/0 \| 提交时间：2020/09/23 electromagnetic source scattering phaseless far field data uniqueness phase retrieval direct sampling methods
	Modulation transfer function measurement of sampled imaging systems in field test (EI CONFERENCE) 会议论文 OAI收割 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, April 26, 2010 - April 29, 2010, Dalian, China 作者: Yang L.; Zhang J.; Zhang J.; Zhang J.; Wang J. 收藏 \| 浏览/下载：30/0 \| 提交时间：2013/03/25 A digital mirror device (DMD) based light projector was developed as the target generator in modulation transfer function (MTF) measurement. In order to overcome the sampling-scene phase effect in MTF measurement of sampled imaging systems a method using random targets is introduced to yield a phase-averaged MTF. The main potential problem of implementing this method is the fact that the stationary assumption of the random targets may be vitiated in practical measurement especially in field test due to the ill condition. We provide an efficient model-independent way of analyzing and isolating the spectral contents arising from these additional contributions to MTF measurement. Algorithms with adaptive parameter selection were also developed for spectral estimation of the test image in order to overcome the challenge brought by the size limit of the test matrices for one certain field of view derived from the isoplantic region. The MTF measurement of a CCD video imager is used to demonstrate the measurement technique and illustrate the benefits over other methods. In order to validate the results comparisons have been made between MTF measurements of imager implemented using this method and bar target direct measurements. 2010 Copyright SPIE - The International Society for Optical Engineering.