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CAS IR Grid
机构
长春光学精密机械与物... [8]
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OAI收割 [8]
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会议论文 [8]
发表日期
2010 [8]
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发表日期:2010
内容类型:会议论文
专题:长春光学精密机械与物理研究所
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Restoration of an atmospherically blurred image based on physical model fusion approach
会议论文
OAI收割
2010
作者:
Zhang Y.
收藏
  |  
浏览/下载:10/0
  |  
提交时间:2013/03/28
Design and Fabrication of CGH for aspheric surface testing and its experimental comparison with null lens
会议论文
OAI收割
2010
Li F. Z.
;
Zhao J. L.
;
Li R. G.
;
Zhang B. Z.
;
Zheng L. G.
;
Zhang X. J.
收藏
  |  
浏览/下载:5/0
  |  
提交时间:2013/03/28
Manufacture of Phi 1.2m Reaction Bonded Silicon Carbide Mirror Blank
会议论文
OAI收割
2010
作者:
Zhang G.
;
Zhang G.
;
Zhang G.
收藏
  |  
浏览/下载:8/0
  |  
提交时间:2013/03/28
Study on sensing properties of a temperature-independent high pressure sensor base on tapered FBG (EI CONFERENCE)
会议论文
OAI收割
International Symposium on Photonics and Optoelectronics, SOPO 2010, June 19, 2010 - June 21, 2010, Chengdu, China
作者:
Liu Y.
;
Zhang Y.
;
Zhang X.
;
Zhang X.
;
Zhang X.
收藏
  |  
浏览/下载:20/0
  |  
提交时间:2013/03/25
The sensing properties with strain and temperature of tapered FBG had been researched both theoretically and experimentally. Based on tapered FBG and thin-wall strain cylinder structure
a novel temperature-independent high pressure sensor was fabricated and investigated. The tapered FBG performed as a chirped grating
whose bandwidth and reflection power broadened and increased when the pressure applied on it. Moreover
the bandwidth and the reflection power were temperature-independent. So the value of the strain can be obtained by detecting the reflection power. This method effectively solved the cross-sensitivity problem. The experiment results indicated that this sensor provided a measurement range of 040MPa with a sensitivity of 0.04w/MPa
low cost and good application prospect. 2010 IEEE.
Design and fabrication of CGH for aspheric surface testing and its experimental comparison with null lens (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:
Zhao J.
;
Zhang X.
;
Zhang X.
;
Zhang X.
;
Li F.
收藏
  |  
浏览/下载:32/0
  |  
提交时间:2013/03/25
Computer-generated hologram (CGH) is an effective way to compensate wavefront in null test of aspheric surfaces and freeform surfaces. Our strategies of CGH design and fabrication for optical testing are presented
and an experiment demonstrating the compensation results of CGH and null lens is also reported. In order to design complex CGH
software was developed
with which we can design a CGH including three sections: main section for compensating wavefront in null test
alignment section for adjusting the relative position between CGH and interferometer
and fiducial section for projecting fiducial marks around the optics under test. The design result is represented in GDS II format file which could drive a laser-direct-writer- machine to fabricate a photomask. Then
a 1:1 replication process is applied to duplicate the patterns from photomask to a parallel optical substrate whose surface is error better than /60 rms. Finally
an off-axis aspheric surface was tested with CGH and null lens respectively. The test result with CGH (0.019rms) is almost the same as the result with null lens (0.020 rms). This experiment also demonstrated that fiducial marks projected by CGH can be used to guide the alignment of the optics and measurement of its off-axis distance. 2010 Copyright SPIE - The International Society for Optical Engineering.
Manufacture of 1.2m reaction bonded silicon carbide mirror blank CFID (EI CONFERENCE)
会议论文
OAI收割
5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, April 26, 2010 - April 29, 2010, Dalian, China
作者:
Zhang G.
;
Zhang G.
;
Zhang G.
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  |  
浏览/下载:16/0
  |  
提交时间:2013/03/25
Silicon carbide (SiC) is a new type candidate material for large-scale lightweight space mirror. Its low thermal distortion
high stiffness
fine optical quality and dimensional stability
make SiC an ideal material for large space born telescope. Since ten years Changchun institute optics
fine mechanics and physics (CIOMP) has developed reaction bonded SiC (RB-SiC) technology for space application
and can fabricate RB-SiC mirror with scale less than 1.0 meter for telescope. The green body is prepared with gel-casting method which is an attractive new ceramic forming process for making high-quality
complex-shaped ceramic parts. And then unmolding
drying
binder burning out
reacting bonded
the RB-SiC can be obtained. But with the development of space-born or ground telescope
the scale of primary mirror has exceeded 1.0 meter. So CIOMP has developed an assembly technique which called novel reaction-formed joint technology for larger RB-SiC mirror blank. The steps include joining of green bodies with mixture comprised of SiC particles and phenolic resin etc
firing
machining and sintering. Joining the 1.2 meter RB-SiC mirror blank by the novel reaction-formed joint technology. And testing the welding layer's performance
the results show that the thickness of 54-77m
the microstructure and thermal property can be comparable to the substrate and the mechanical property are excellent in bending strength of 307MPa. 2010 Copyright SPIE - The International Society for Optical Engineering.
Restoration of an atmospherically blurred image based on physical model fusion approach (EI CONFERENCE)
会议论文
OAI收割
2010 IEEE 10th International Conference on Signal Processing, ICSP2010, October 24, 2010 - October 28, 2010, Beijing, China
作者:
Wang Y.
;
Li J.
;
Li J.
;
Li J.
;
Wang Y.
收藏
  |  
浏览/下载:19/0
  |  
提交时间:2013/03/25
This paper proposes a new restoration method
only using the single image information
combining atmospheric physical model with fusion techniques to reduce the degradation of the image contrast in bad weather conditions caused by atmospheric aerosols
such as haze and fog. The basic idea of this method is to utilize physics-based model method instead of multisensors to generate a serial of virtual images
and then to fuse those virtual images into a high contrast image based on the wavelet fusion technique. In contrast to previous methods
our restoration technique is not only independent on predicted structure
distributions of scene reflectance
or detailed knowledge about the particular weather condition
but also adapt to the situation without a reference image or images with moving objects captured by a video camera. Experiments on different poorcontrast images demonstrate the availability of the proposed method in case of restoring the atmospherically blurred images. 2010 IEEE.
Directional Multiscale Edge Detection Using the Contourlet Transform
会议论文
OAI收割
2010
Ma S. F.
;
Zheng G. F.
;
Jin L. X.
;
Han S. L.
;
Zhang R. F.
收藏
  |  
浏览/下载:7/0
  |  
提交时间:2013/03/28