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长春光学精密机械与物... [3]
华南理工大学 [2]
山东大学 [1]
西安理工大学 [1]
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会议论文 [3]
会议 [2]
期刊论文 [2]
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2018 [1]
2013 [1]
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2006 [1]
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Employment of the appropriate range of sawtooth-shaped-function illumination intensity to improve the image quality
期刊论文
OPTIK, 2018, 卷号: 175, 页码: 189-196
作者:
Yu, Jianping
;
Li, Gang
;
Wang, Shaohui
;
Lin, Ling
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浏览/下载:3/0
  |  
提交时间:2019/12/11
Light intensity range
Sawtooth-shaped-Function
Gray-scale resolution
Medical image quality
Signal-to-noise ratio
A comparative study of two generation partial light intensity imager based on liquid crystal
期刊论文
2013, 卷号: 122, 页码: 87-96
作者:
Tang, Yuanhe
;
Yang, Xusan
;
Gao, Haiyang
;
Wu, Yong
;
Wang, Shuiwei
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  |  
浏览/下载:3/0
  |  
提交时间:2019/12/20
Imaging system
Wide dynamic range
Real time
Partial light intensity imager
Liquid crystal
Design and demonstration of micro multi-step mirrors and light source in micro FTIR (EI CONFERENCE)
会议论文
6th IEEE International Conference on Nano/Micro Engineered and Molecular Systems, NEMS 2011, February 20, 2011 - February 23, 2011, Kaohsiung, Taiwan
Liang Z.
;
Fu J.
;
Feng C.
;
Liang J.
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浏览/下载:36/0
  |  
提交时间:2013/03/25
To obtain high resolution
high signal-to-noise ratio (SNR)
high reliability and real time in wide spectral range
we study the space modulation Micro Fourier Transform Spectrometer (FTS) based on multi-step mirrors covering the spectral range of 3-5m and 8-12 m in theory and experiment. The influences of spectrum reconstruction caused by the diffraction and extended light source in Fourier Transform Infrared Spectrometer (FTIR) are analyzed. A method to reduce the noises in spectrum reconstruction and the relationship between coherent intensity and solid angle of light source are discussed. An extended light source with suitable size is chosen
considering the requirement of SNR and spectrum resolving power in the optical design. Furthermore
the fabrication of micro multi-step mirrors
which is the core part of FTS
is investigated. Three methods for fabricating multi-step micro mirrors are demonstrated. 2011 IEEE.
Research on the support structure of the primary mirror of large-aperture telescope (EI CONFERENCE)
会议论文
3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies, AOMATT 2007: Large Mirrors and Telescopes, July 8, 2007 - July 12, 2007, Chengdu, China
Yang W.
;
Jingxu Z.
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浏览/下载:23/0
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提交时间:2013/03/25
Large-aperture telescope can be used in surveying battlefield
researching landform
searching object
real-time monitoring
imaging
detecting and identifying spatial targets and so on. A large-aperture telescope for achieving high resolution power is designed to monitor spatial target and image in real time. Real-time monitoring plays an important role in military conflicts. The orbit parameter of object
quantity
geometrical shape parameter and so on can be obtained by detect spatial target. With the development of optical technology
people require larger aperture in optics-electronic (OE) system. By increasing optical aperture
the ability of collecting light and resolution power in the system can be enhanced. But the support structure of the primary mirror of large-aperture telescope will be a very difficult problem. With the increase of primary mirror aperture
the weight of the primary mirror will become larger than before. The root mean square (rms) of the primary mirror is affected by many factors
such as deadweight
deformation of heat
environment and so on. Due to the primary mirror of telescope is an important component of telescope system. By reducing the weight of primary mirror
precision of the system is ensured. During the designing phase
one can consider the supporting project of the primary mirror synthetically and analyze it roundly according to technical requirement of optical system and the effect factors. The final structural design can be reasonable. In an astronomical telescope
the surface of reflector is an important part for collecting dark radiation of celestial bodies. Its surface shape will have an effect on collecting efficiency of telescope radiant energy directly. So the rms must be very high. Optical system of large aperture
small wavelength and small focus can receive maximal light intensity. For ground-based optical astronomical telescope
the design proposed in the paper can satisfy the requirement of the possible minimum atmosphere seeing at astronomical observatory site and exert the use efficiency of the telescope adequately. So the accuracy of the traditional surface of reflector can assure that 90% of all the light energy can be focused on within the angle diameter range of the minimum atmosphere seeing
then 100% of light energy should be focused on the angle diameter range of minimum atmosphere seeing. Because the rms of mirror is very high
precise surface machining and accurate the support of mirror are very important tasks during designing and manufacturing the telescope. In the paper
various support techniques of a large-aperture telescope primary mirror are discussed and a 3.5 meter telescope system at the Starfire Optical Range (SOR) overviewed simply
which was operated by the Directed Energy Directorate of the Air Force Research Laboratory
Kirtland AFB
NM
USA from the ground-based O-E system for the observations of spatial target. We also analyze Theoretical elastic deformation of the Steward Observatory 2.3 meter mirror is analyzed.
Key techniques of laser direct writing of fine lines on the spherical surface (EI CONFERENCE)
会议论文
ICO20: Optical Design and Fabrication, August 21, 2005 - August 26, 2005, Changchun, China
Liang F.
;
Hu J.
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浏览/下载:16/0
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提交时间:2013/03/25
The main principles of laser direct writing (LDW) system for lines on the spherical surface (SS) are discussed. It is pointed out that line profile is determined by the exposure dose distribution
which lies on the light intensity distribution of focus plane and the scanning speed. To improve the quality of line profile on the SS
several key techniques as follows are introduced. Firstly
the unique system configuration
four axes mutually intersecting at the center of the SS
is adopted
which ensures the shape of the focus be maintained circular during the writing period. Secondly
an automatic focus system (AFS) with the function of automatic focus in a certain range is introduced. Thirdly
to guarantee the linear velocity to accord with the exposure character of the photoresist all the time
an efficient arithmetic that controls motors run at appropriate angular velocity in different latitude is developed. Finally
to achieve a stable and well-behaved system so as to compensate the velocity instability resulting from unavoidable errors of mechanical and electronics factor
a powerful programmable multi-axis controller (PMAC) is utilized as the kernel element of the servocontrol system
and the curves of step response and parabolic response achieved by feedforward and PID loop tuning indicate that the location precision and velocity stability have reached a high level. The experimental results of LDW of lines on the SS work piece with a diameter 30 mm and a radius equal to 100 mm are given. The section analysis of the lines on the photoresist by the atomic force microscope (AFM) after exposure and development is performed. The results show that line width is about 3.0 m
and the steep sides of the lines are parallel to each other.
DEPTH ESTIMATION BY ANALYZING INTENSITY DISTRIBUTION FOR LIGHT-FIELD CAMERAS (CPCI-S收录)
会议
作者:
Xu, Yatong[1]
;
Jin, Xin[1]
;
Dai, Qionghai[1]
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浏览/下载:2/0
  |  
提交时间:2019/04/11
depth estimation
Light-field
intensity range
confidence measure
DEPTH FUSED FROM INTENSITY RANGE AND BLUR ESTIMATION FOR LIGHT-FIELD CAMERAS (CPCI-S收录)
会议
作者:
Xu, Yatong[1]
;
Jin, Xin[1]
;
Dai, Qionghai[1]
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浏览/下载:5/0
  |  
提交时间:2019/04/11
depth estimation
Light-field
intensity range
depth fusion
confidence measure
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