中国科学院机构知识库网格系统: 检索

Research on distributed space objects detection technology based on optical fiber image bundles 会议论文 OAI收割
Kunming, China, 2021-12-07
作者: Wang, Huawei; Ma, Yingjun; Liao, Jiawen; Gao, Bo; Fang, Yao

|

收藏 | 浏览/下载：76/0 | 提交时间：2022/04/27

Multi-aperture Optical fiber image bundles Optical lens Objects detection Camera

Applications and development of micro- or nano-metric multi degree of freedom adjusting displacement scaling mechanisms for primary mirror 会议论文 OAI收割
Xian, PEOPLES R CHINA, 2020-10-15
作者: Hu, Bin; Li, Chuang; Zhu, Qing; Ye, Jing

|

收藏 | 浏览/下载：31/0 | 提交时间：2021/07/23

multi degree of freedom adjusting displacement scaling mechanism micro- or nano-metric segmented primary mirror large aperture space telescope

Data recovery in inverse scattering: From limited-aperture to full-aperture 期刊论文 OAI收割
JOURNAL OF COMPUTATIONAL PHYSICS, 2019, 卷号: 386, 页码: 350-364
作者: Liu, Xiaodong; Sun, Jiguang

|

收藏 | 浏览/下载：53/0 | 提交时间：2020/01/10

Inverse scattering Multi-static response matrix Limited-aperture Data recovery

A novel space-time coding scheme used for mimo-sar systems 期刊论文 iSwitch采集
Ieee geoscience and remote sensing letters, 2015, 卷号: 12, 期号: 7, 页码: 1556-1560
作者: Wang, Jie; Liang, Xing-Dong; Chen, Long-Yong; Li, Kun

收藏 | 浏览/下载：27/0 | 提交时间：2019/05/10

Ambiguous energy suppression Multi-input-multi-output synthetic aperture radar (mimo-sar) Space-time coding (stc)

A Variational Model for PolSAR Data Speckle Reduction Based on the Wishart Distribution 期刊论文 OAI收割
IEEE TRANSACTIONS ON IMAGE PROCESSING, 2015, 卷号: 24, 期号: 4, 页码: 1209-1222
作者: Nie, Xiangli; Qiao, Hong; Zhang, Bo

收藏 | 浏览/下载：36/0 | 提交时间：2015/09/18

Polarimetric synthetic aperture radar (PolSAR) speckle reduction multi-channel total variation complex Wishart distribution variational model

VESSEL DETECTION METHOD FOR HIGH RESOLUTION COSMO-SKYMED SAR IMAGERY 会议论文 OAI收割
2011 Ieee International Geoscience and Remote Sensing Symposium, New York
Fan Wu; Chao Wang; Hong Zhang; Bo Zhang

收藏 | 浏览/下载：22/0 | 提交时间：2014/12/07

Synthetic Aperture Radar (SAR) Vessel detection High resolution Gravity enhancement Multi-scale SHIP DETECTION TERRASAR-X

Optical system of golay-3 synthetic aperture telescope of Fizeau style (EI CONFERENCE) 会议论文 OAI收割
2010 3rd International Conference on Advanced Computer Theory and Engineering, ICACTE 2010, August 20, 2010 - August 22, 2010, Chengdu, China
作者: Sun Z.-Y.

收藏 | 浏览/下载：18/0 | 提交时间：2013/03/25

In order to get high resolution the field of view is 4. Analyzed the imaging a optical system of golay-3 synthetic aperture telescope has been designed which adopt Fizeau multi-telescope frame. The angular magnification of sub-aperture is -4 the fill factor is 113. The configuration of light beam combiner is Cassegrain style added a lens. The total focal length is 6000mm the PSF have been improved remarkably and the cut-off frequency of MTF is close to that of full aperture. 2010 IEEE.

Optical system design with high resolution and large field of view for the remote sensor (EI CONFERENCE) 会议论文 OAI收割
Chang J.; Weng Z.-C.; Wang Y.-T.; Cheng D.-W.; Jiang H.-L.

收藏 | 浏览/下载：28/0 | 提交时间：2013/03/25

In this paper we are presenting a design method and its results for a space optical system with high resolution and wide field of view. This optical system can be used both in infrared and visible configurations. The designing of this system is based on an on-axis three-mirror anastigmatic (TMA) system. Here the on-axis concept allows wide field of view (FOV) enabling a diversity of designs available for the Multi-Object Spectrometer instruments optimized for low scattered and low emissive light. The available FOVs are upto 1 in both spectrum ranges whereas the available aperture range is F/15 - F/10. The final optical system is a three-mirror telescope with two on-axis and one off-axis segment and its resolution is 0.3m or even lower. The distinguished feature of this design is that it maintains diffraction-limited image at wide wavelengths. The technological developments in the field of computer generated shaping of large-sized optical surface details with diffraction-limited imagery have opened new avenues towards the designing techniques. Such techniques permit us to expand these technological opportunities to fabricate the aspherical off-axis mirrors for a complex configuration.

Automatic spin coater for concave spherical substrate (EI CONFERENCE) 会议论文 OAI收割
3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies, AOMATT 2007: Design, Manufacturing, and Testing of Micro- and Nano-Optical Devices and Systems, July 8, 2007 - July 12, 2007, Chengdu, China
Fengchao L.; Jingsong G.; Xiaoguo F.; Jingli Z.; Zhijun X.; Jun H.; Fenglin X.; Huiqing W.; Xiaohan L.

收藏 | 浏览/下载：22/0 | 提交时间：2013/03/25

Coating photoresist film with uniform thickness on concave spherical substrate (CSS) is very important for microfabrication of concave spherical optical elements by lithography technique via a laser direct writer for the uneven photoresist film will result in ununiformity of line width so as to influence the characters of optical elements. For improving the uniformity of photoresist film coating on CSS an automatic spin coater was designed. The process and the mathematical model of spin coating for CSS were analyzed. Difficulties for realizing the spin coater consist of the control of multi-axis motion precisely and collaboratively valves on/ff properly and real-timely. A flexible and well-behaved spinning motion system was achieved by tmeans of principal and subordinate CPUs control. The motion program for spin coating could be created and implemented automatically while the pressure and the valves were was watched and controlled in real time. Film coating and laser direct writing experiments on a CSS with aperture equals to 100 mm and radius equals to 370 mm were performed. Photoresist film with uniform thickness on CSS was obtained by selecting proper spin coating parameters such as rotational speed acceleration and viscosity of the photoresist. After development the section analysis by the atomic force microscope showed that photoresist film thickness was about 517 nm in the center and about 520 nm in the edge of substrate the film thickness error was within 1% and the line width was about 6.0 m with steep sides parallel each other. Experimental results indicate that uniform thickness of thin photoresist film has been coated on CSS by the spin coater which contributes to quality improvement of laser direct writing lines on CSS.

Mid-frequency surface error test with a Foucault apparatus (EI CONFERENCE) 会议论文 OAI收割
3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, July 8, 2007 - July 12, 2007, Chengdu, China
作者: Li J.; Li J.; Xuan B.; Li J.

收藏 | 浏览/下载：16/0 | 提交时间：2013/03/25

Testing of mid-frequency surface error is of the first importance for fast optics especially for large aperture aspherics. Foucault test plays a dominant role for surface error inspection before the digital interferometer age but it seems to have faded out these days because no quantitative results turn out. However an interferometer with high resolution CCDs is either unavailable or unaccessible in the process of manufacture. As its advantages are realized and recognized for the second time Foucault test is going back to the stage again. A new theory of calculating the contrast of the shadow pattern of Foucault test is put forward in this paper and some modifications are discussed upon the analyses of the limitation of traditional Foucault apparatus. A paraboloidal mirror was fabricated and tested by the modified Foucault apparatus whose effect has been proved to be great. The methods of controlling mid-frequency error are described in the other paper at this conference- "Multi-mode combine manufacturing technology for large aperture aspheric mirrors"1.