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CAS IR Grid
机构
长春光学精密机械与物... [7]
工程热物理研究所 [1]
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OAI收割 [8]
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会议论文 [7]
期刊论文 [1]
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Structural design of large aperture rectangular mirror for space telescope (EI CONFERENCE)
会议论文
OAI收割
2nd International Conference on Civil Engineering and Transportation, ICCET 2012, October 27, 2012 - October 28, 2012, Guilin, China
作者:
Li Z.
;
Li Z.
收藏
|
浏览/下载:45/0
|
提交时间:2013/03/25
Structural design of large aperture mirror is one of the key technologies for space telescope development. To meet the requirements of high stiffness
strength and thermal dimensional stability
some factors such as support scheme
materials selection
lightweight design and flexible support design were taken into account. The three supports location of the mirror was determined according to the modal analytical solution. By adjusting the parameters of flexure hinge
influences of gravity
assembly stress and thermal stress on the mirror were reduced obviously. Finite element analysis (FEA) results indicate that the surface accuracy reach to rms10.2nm and 10.8nm under the gravity along optical axis direction and 5C uniform temperature rise respectively
the fundamental frequency of the mirror component is 268Hz. Dynamics test shows that the first order natural frequency is 256Hz
which shows an error less than 5% compared to FEA results. (2013) Trans Tech Publications
Switzerland.
Comparison and simulation of subpixel imaging modes for linear CCD (EI CONFERENCE)
会议论文
OAI收割
2012 3rd International Conference on Information Technology for Manufacturing Systems, ITMS 2012, September 8, 2012 - September 9, 2012, Qingdao, China
作者:
Li Y.
;
He B.
;
Li Y.
;
Li Y.
;
Li Y.
收藏
|
浏览/下载:40/0
|
提交时间:2013/03/25
Subpixel technique of linear CCD is effective to enhance the spatial resolution without increasing the focal length of optics and reducing the pixel size. To compare image quality of two main subpixel imaging modes
quincunx sampling and four-point sampling
a method to quantitatively evaluate image quality of subpixel based on MTF was proposed. The MTF of quincunx and four-point sampling modes were derived. Analytical results shows that theoretical limiting resolution of quincunx sampling and four-point sampling is improved to 1.4 and 1.86 times respectively
and MTF values at Nyquist frequency of two modes are increased by 0.1106 and 0.1679
respectively. MTFA in (0
0.5) of two subpixel imaging modes were calculated and results illustrates that four-point sampling offers much more improvement with image quality than quincunx sampling
at the cost of double amount of data. A model for simulating subpixel imaging using Matlab was established
and simulation results of spoke target verify the theoretical analysis. (2012) Trans Tech Publications
Switzerland.
A fuzzy control method based on information integration for double inverted pendulum (EI CONFERENCE)
会议论文
OAI收割
2011 2nd International Conference on Digital Manufacturing and Automation, ICDMA 2011, August 5, 2011 - August 7, 2011, Zhangjiajie, Hunan, China
作者:
Fan Y.
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|
浏览/下载:66/0
|
提交时间:2013/03/25
This article proposes a new fuzzy controller based on information integration. The mathematical model of Linear double inverted pendulum has been studied and estabLished with dynamics analytical method and LQR theory is used to design the optimal Linear inverted pendulum controller
then
the integration technology is used to design the variable parameters self-tuning fuzzy controller. Thereby
the fuzzy controller input variable dimension and the number of fuzzy control rules have been extremely reduced. Two controllers are designed for inverted pendulum system control and the comparison simulation experiments have been done. The results show that the controllers can both reaLize good control
and the fuzzy controller has higher precision
faster response
better stabiLity and robustness. 2011 IEEE.
A study of the axisymmetric thermal strain in a laser rod with longitudinal temperature rise
期刊论文
OAI收割
APPLIED THERMAL ENGINEERING, 2009, 卷号: 29, 期号: 14-15, 页码: 2927-2934
作者:
Li, Zhigang
;
Huai, Xiulan
;
Wang, Li
收藏
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浏览/下载:21/0
|
提交时间:2015/12/18
Thermal stress
Thermal strain
Analytical results
Numerical simulation
Longitudinal temperature rise
Modeling diffractive optical elements in hybrid systems with the effect of the material dispersion (EI CONFERENCE)
会议论文
OAI收割
Current Developments in Lens Design and Optical Engineering IX, August 11, 2008 - August 12, 2008, San Diego, CA, United states
作者:
Zhang H.
;
Liu H.
;
Liu H.
;
Liu H.
;
Zhang H.
收藏
|
浏览/下载:16/0
|
提交时间:2013/03/25
The diffractive optical element (DOE) is always modeled as an ideal pure diffractive element which neglects the refractive dispersion of the element's material. In this paper
a new model of the diffractive optical element is proposed
in which the effect of the refractive dispersion of the DOE's material is considered. The new model is explained and compared with standard diffraction-order expansion with the help of a hybrid system example. The analytical results show that the new model has an important meaning for the exact analysis of the hybrid refractive-diffractive optical system. 2008 Copyright SPIE - The International Society for Optical Engineering.
The study on the near infrared spectrum technology of sauce component analysis (EI CONFERENCE)
会议论文
OAI收割
ICO20: Optical Information Processing, August 21, 2005 - August 26, 2005, Changchun, China
作者:
Li S.
;
Wang C.
;
Chen X.
;
Chen X.
;
Chen X.
收藏
|
浏览/下载:37/0
|
提交时间:2013/03/25
The author
Shangyu Li
engages in supervising and inspecting the quality of products. In soy sauce manufacturing
quality control of intermediate and final products by many components such as total nitrogen
saltless soluble solids
nitrogen of amino acids and total acid is demanded. Wet chemistry analytical methods need much labor and time for these analyses. In order to compensate for this problem
we used near infrared spectroscopy technology to measure the chemical-composition of soy sauce. In the course of the work
a certain amount of soy sauce was collected and was analyzed by wet chemistry analytical methods. The soy sauce was scanned by two kinds of the spectrometer
the Fourier Transform near infrared spectrometer (FT-NIR spectrometer) and the filter near infrared spectroscopy analyzer. The near infrared spectroscopy of soy sauce was calibrated with the components of wet chemistry methods by partial least squares regression and stepwise multiple linear regression. The contents of saltless soluble solids
total nitrogen
total acid and nitrogen of amino acids were predicted by cross validation. The results are compared with the wet chemistry analytical methods. The correlation coefficient and root-mean-square error of prediction (RMSEP) in the better prediction run were found to be 0.961 and 0.206 for total nitrogen
0.913 and 1.215 for saltless soluble solids
0.855 and 0.199 nitrogen of amino acids
0.966 and 0.231 for total acid
respectively. The results presented here demonstrate that the NIR spectroscopy technology is promising for fast and reliable determination of major components of soy sauce.
Study of dynamic response on a MOEMS 22 optical switch (EI CONFERENCE)
会议论文
OAI收割
Optical Transmission, Switching, and Subsystems II, November 9, 2004 - November 11, 2004, Beijing, China
作者:
Wang G.
;
Chen W.
收藏
|
浏览/下载:30/0
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提交时间:2013/03/25
The MOEMS 22 optical switch with slant lower electrode and with torsion beam on silicon is designed and analyzed theoretically. Analytical formulae for the squeeze film damping coefficient and the squeeze film damping moment on the cantilever beam of the optical switch are derived. Based on the torsion dynamics theory
the technique and relative results are presented for analyzing the actuating voltage and the switch time. The optimized result of parameters is as: length
width and thickness of the torsion beam are 700
12 and 10 m
length and width of the cantilever beam are 1900 and 1000 m
length and width of the balance beam are 100 and 1000 m
shortest spacing between the upper and lower electrodes is 0.05 m
and highness of the lower electrode is 55 m
respectively. The actuating voltage is less than 10 V
and the switching time of Ton and Toff are 1.30ms and 1.25ms
respectively. The computed results show that the air squeeze film damping is an important factor for the study of dynamic response on MOEMS optical switch.
Imaging quality analysis of KBA x-ray microscope working at grazing incidence (EI CONFERENCE)
会议论文
OAI收割
Optical Design and Testing II, November 8, 2004 - November 11, 2004, Beijing, United states
作者:
Zhao L.
收藏
|
浏览/下载:27/0
|
提交时间:2013/03/25
In the latest 20 years
x-ray imaging technology has developed fast in order to meet the need of x-ray photo-etching
spatial exploration technology
high-energy physics
procedure diagnosis of inertial confinement fusion (ICF) et al. Since refractive index of materials in the x-ray region is lower than 1
and x-ray is strongly absorbed by materials
it is very difficult to image objects in the x-ray region. Conventional imaging methods are hardly suitable to x-ray range. In general
grazing reflective imaging and coding aperture imaging methods have been adopted more and more. In this paper
according to user's requirement
we have designed a non-coaxial grazing KBA microscope. The microscope consists of two sets of perpendicular spherical mirrors
each set includes two parallel mirrors. Taking it as an example
we have compiled an optical computing program for the non-coaxial grazing imaging systems so as to analyze and evaluate aberrations of KBA microscope. Thus it can help us to get an optimal comprehension of KBA x-ray imaging system. In the same time
the analytical results provide reliable foundation for evaluating imaging quality of KBA microscope.
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