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Review on the research of space-based direct imaging technologies for exoplanets detection 会议论文
Beijing, China, 2019-07-07
作者:  Hu, Bin;  Li, Chuang;  Li, Xuyang
收藏  |  浏览/下载：2/0  |  提交时间：2020/03/04
The research status of direct imaging of expolanets 会议论文
Proceedings of the 4th International Conference of Electronic Engineering and Information Science (ICEEIS 2017), Haikou, P.R. China, 2017-1-7
作者:  Z.J. Han;  D. Ren;  J.P. Dou;  Y.T. Zhu;  X. Zhang
收藏  |  浏览/下载：21/0  |  提交时间：2019/02/02
Direct Image Reconstruction for 3-D Electrical Resistance Tomography by Using the Factorization Method and Electrodes on a Single Plane 会议论文
29th Annual IEEE International Instrumentation and Measurement Technology Conference (I2MTC), Graz, AUSTRIA, 2013-05-01
作者:  Cao, Zhang;  Xu, Lijun
收藏  |  浏览/下载：6/0  |  提交时间：2020/01/06
Nanoscale patterns made by using a 13.5-nm Schwarzschild objective and a laser produced plasma source (EI CONFERENCE) 会议论文
Optical Micro- and Nanometrology IV, April 16, 2012 - April 18, 2012, Brussels, Belgium
Wang Z.; Wang X.; Mu B.; Bai Y.
收藏  |  浏览/下载：29/0  |  提交时间：2013/03/25
Lithium fluoride (LiF) crystal is a very promising candidate as nanometer resolution EUV and soft X-ray detector. Compared with other EUV and soft X-ray detectors  charge coupled device and photographic films  LiF crystal has high resolution  large field of view and wide dynamic range. In this paper  using LiF crystal as EUV detector and a Schwarzschild objective (SO) working at 13.5nm as projection optics  mesh images with 4.2 m  1.2 m and 800 nm line width and pinhole patterns with 1.5m diameter are acquired in projection imaging mode and direct writing mode  respectively. Fluorescence intensity profiles of images show that the resolution of mesh image is 900 nm  and the one of pinhole image is 800 nm. In the experiments  a spherical condense mirror based on normal incidence type is used to eliminate the damage and contamination on the masks (mesh and pinhole) caused by the laser plasma  and the energy density is not decreased compared with that the masks are close to the plasma. The development of the SO  the alignment of the objective and the imaging experiments are also reported. 2012 Copyright Society of Photo-Optical Instrumentation Engineers (SPIE).  
A neural network approach to blind-estimation of PN spreading sequence in lower SNR DS/SS signals 会议论文
2004 7TH INTERNATIONAL CONFERENCE ON SIGNAL PROCESSING PROCEEDINGS, VOLS 1-3, 7th International Conference on Signal Processing, Beijing, PEOPLES R CHINA, Web of Science
Chang, TQ; Lin, XK; Zhou, ZZ
收藏  |  浏览/下载：2/0
Modulation transfer function measurement of sampled imaging systems in field test (EI CONFERENCE) 会议论文
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
Yang L.; Sun Q.; Wang J.; Zhang J.
收藏  |  浏览/下载：15/0  |  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.  
Narcissus analysis for cooled staring IR system (EI CONFERENCE) 会议论文
3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies, AOMATT 2007: Advanced Optical Manufacturing Technologies, July 8, 2007 - July 12, 2007, Chengdu, China
He F.-Y.; Cui J.-C.; Feng S.-L.; Zhang X.
收藏  |  浏览/下载：17/0  |  提交时间：2013/03/25
Narcissus can have a deleterious effect on image quality for cooled infrared imaging systems. Therefore  analysis of narcissus is important for designing both scanning and staring optics. Narcissus is generally assumed to be negligible in staring IR optical designs because the shading effects can be removed by calibration of the detector array data. However  the calibration usually decreases sensitiveness of the system and Narcissus variation may be noticeable for sensors when the conditions changes as follows: 1. warming and cooling the optical housing  2. zooming optical elements  3. movement of lenses for focus. In that case  it will result in shading and other image defects even after calibration. To minimize these effects  narcissus should be assessed and controlled during the design of staring array IR system. We provided a direct and fast method for analyzing the narcissus variation in the presence of software such as LightTools  TracePro and ASAP  and proposed the principles in optical design of staring IR systems to reduce narcissus. A cooled staring IR system with serious narcissus was estimated and reoptimized. Narcissus analysis of this IR system confirmed the efficiency of the analysis method.  

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