scholarly journals Optimal F-Number of Ritchey–Chrétien Telescope Based on Tolerance Analysis of Mirror Components

2020 ◽  
Vol 10 (15) ◽  
pp. 5038
Author(s):  
Sheng-Feng Lin ◽  
Cheng-Huan Chen ◽  
Yi-Kai Huang
Keyword(s):  
System Parameter ◽  
Tolerance Analysis ◽  
Alignment Error ◽  
Mean Square ◽  
Random Surface ◽  
Secondary Mirror ◽  
Optical Module ◽  
Wavefront Error ◽  
Allowable Range ◽  
In The Beginning

The Ritchey–Chrétien telescope has been the key optical module for remote sensing instruments (RSI), in which the root mean square (RMS) random surface wavefront error and the alignment error of the primary and the secondary mirror takes the highest weighting in the tolerance analysis for the fabrication and assembly of the telescope. Therefore, the higher tolerance of those items becomes preferable for higher efficiency of RSI manufacturing. In this paper, the correlation between those tolerance items and the f-number of the telescope has been investigated. Although the f-number is normally a system parameter well specified in the beginning of the design process, it is not very rigid in practice and has a certain amount of allowable range. The optimal f-number can then be chosen based on the consideration of those key tolerance items. The proposed concept can be generalized as a novel methodology of design for tolerance.

scholarly journals Cylinder-Flat Contact Mechanics with Surface Roughness

2020 ◽  
Vol 69 (1) ◽  
Author(s):  
A. Tiwari ◽  
B. N. J. Persson
Keyword(s):  
Surface Roughness ◽  
Contact Pressure ◽  
Dimensionless Parameter ◽  
Elastic Half Space ◽  
Root Mean Square Roughness ◽  
Mean Square ◽  
Hertz Contact ◽  
Random Surface ◽  
Roughness Amplitude ◽  
Flat Contact

AbstractWe study the nominal (ensemble averaged) contact pressure p(x) acting on a cylinder squeezed in contact with an elastic half space with random surface roughness. The contact pressure is Hertzian-like for $$\alpha < 0.01$$ α < 0.01 and Gaussian-like for $$\alpha > 10$$ α > 10 , where the dimensionless parameter $$\alpha = h_{\rm rms}/\delta $$ α = h rms / δ is the ratio between the root-mean-square roughness amplitude and the penetration for the smooth surfaces case (Hertz contact).

scholarly journals Three-dimensional relationship between high-order root-mean-square wavefront error, pupil diameter, and aging

2007 ◽  
Vol 24 (3) ◽  
pp. 578 ◽  
Author(s):  
Raymond A. Applegate ◽  
William J. Donnelly, III ◽  
Jason D. Marsack ◽  
Darren E. Koenig ◽  
Konrad Pesudovs
Keyword(s):  
Root Mean Square ◽  
Pupil Diameter ◽  
Three Dimensional ◽  
High Order ◽  
Mean Square ◽  
Wavefront Error ◽  
Order Root

A method of tolerance analysis for wavefront error of lithographic projection lens

2014 ◽  
Vol 40 (4) ◽  
pp. 289-294
Author(s):  
符媛英 FU Yuanying ◽  
李艳秋 LI Yanqiu ◽  
刘晓林 LIU Xiaolin ◽  
曹振 CAO Zhen ◽  
刘克 LIU Ke
Keyword(s):  
Tolerance Analysis ◽  
Projection Lens ◽  
Wavefront Error

scholarly journals Forecasting and Analysis of Australian Tourist Visits to Bali Using Bayesian Vector Autoregression

2018 ◽  
Vol 2 (1) ◽  
pp. 53
Author(s):  
I Wayan Sumarjaya ◽  
I Gusti Ayu Made Srinadi
Keyword(s):  
Exchange Rate ◽  
Exchange Rates ◽  
Vector Autoregression ◽  
Impulse Response Function ◽  
Mean Square ◽  
Vector Autoregressive Model ◽  
Tourism Planning ◽  
Vector Autoregressive ◽  
Dynamic Relationship ◽  
In The Beginning

Information about tourist visits, especially foreign tourist visits, plays important role in tourism planning. One of the main tourist markets for Bali is Australia. The aims of this research are twofold. First, we forecast the number of Australian tourist visits and we also forecast exchange rate and inflation. Second, we study the dynamic relationship between the number of tourist visits, exchange rate, and inflation for the next twelve months, for instance, 2017 and 2018. We model the visits, exchange rate and inflation using Bayesian vector autoregression. We compare several different priors such as Minnesota, normal-Wishart and normal diffuse independent normal-Wishart. Among these priors, the normal-Wishart prior produces the smallest root mean square error. Hence, the normal-Wishart prior was chosen as the prior of choice for our Bayesian Vector Autoregressive model. The forecast shows that there is a decline in the number of tourist visits, but inflation and exchange rates tend to reach a certain level, for instance, stabilized. The impulse response function shows that there were shocks in the beginning period before reaching zero.

Analysis of Diffraction Wavefront Error Caused by Alignment Error of Pinhole

2014 ◽  
Vol 34 (8) ◽  
pp. 0812004 ◽  
Author(s):  
高芬 Gao Fen ◽  
蒋庄德 Jiang Zhuangde ◽  
李兵 Lin Bing
Keyword(s):  
Alignment Error ◽  
Wavefront Error

Analysis of target wavefront error for secondary mirror of a spaceborne telescope

2014 ◽  
Author(s):  
Shenq-Tsong Chang ◽  
Wei-Cheng Lin ◽  
Ching-Hsiang Kuo ◽  
Chia-Yen Chan ◽  
Yu-Chuan Lin ◽  
...  
Keyword(s):  
Secondary Mirror ◽  
Wavefront Error

Compact, Wide-Angle Catadioptric Telescope Design for MWIR Imaging

2019 ◽  
Vol 8 (1) ◽  
pp. 33-48
Author(s):  
Sami D Alaruri
Keyword(s):  
Focal Length ◽  
Optical Design ◽  
Tolerance Analysis ◽  
Optical Path Difference ◽  
Path Difference ◽  
Field Of View ◽  
Modulation Transfer ◽  
Full Field ◽  
Field Curvature ◽  
Wavefront Error

In this work, the optical design of a compact diffraction-limited F/3.0 MWIR (3-5 µm) catadioptric telescope which consists of an aspheric primary mirror, a spherical secondary mirror, a ZnSe-ZnSe-Ge triplet lens and an air-spaced Si-Ge-Si corrector triplet lens placed before the focus is given. The calculated effective focal length, full field of view (FFOV) and angular magnification values for the designed telescope are 600 mm, 2.6° and -9.2, respectively. Zemax® calculations for the telescope MTF (modulation transfer function), PSF (point spread function), RMS (root-mean-square) wavefront error (WFE), optical path difference (OPD), Seidel aberrations, encircled energy, distortion and field curvature are discussed. The telescope performance analysis indicates that the telescope can achieve diffraction-limited image quality performance within the 2.6° full field-of-view. Additionally, the designed telescope can resolve at 50% contrast spatial frequency equal to 18.5 cycles/mm (at the on-axis FOV). Finally, a detailed tolerance analysis for the telescope design employing Monte Carlo and sensitivity analysis simulation features in Zemax® is provided.

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