scholarly journals The Two-Component Lens Reverse Telephoto Lens Simulation Based on the Algebraic Calculation Method for Optical Systems

2016 ◽  
Vol 16 (08) ◽  
Author(s):  
T Rovenskaya ◽  
E Lamkina
Keyword(s):  
Calculation Method ◽  
Optical Systems ◽  
Algebraic Calculation ◽  
Simulation Based ◽  
Two Component ◽  
Telephoto Lens

Lighting Energy Savings From Daylighting Through Skylights for Warehouses

2007 ◽  
Author(s):  
Aymen Mechergui ◽  
Moncef Krarti
Keyword(s):  
Calculation Method ◽  
Open Space ◽  
Energy Use ◽  
Energy Savings ◽  
Control Strategies ◽  
Simulation Based ◽  
Simplified Method ◽  
The World ◽  
Lighting Energy ◽  
Simplified Calculation

The paper provides the results of a simulation-based analysis to estimate the potential savings in electrical lighting energy use associated with daylighting controls using skylights for open space warehouses. First, the effectiveness of daylighting controls is investigated for several skylight opening areas, glazing types, control strategies, and several locations in Tunisia. A simplified calculation method is then developed to estimate the annual savings in electrical lighting energy use due to daylighting controls in warehouses. The simplified method has been developed and validated for several locations throughout the world.

Simulation of segmented mirrors with adaptive optics

2019 ◽  
Vol 8 (2) ◽  
pp. 119-127
Author(s):  
Johannes Störkle ◽  
Luzia Hahn ◽  
Peter Eberhard
Keyword(s):  
Adaptive Optics ◽  
Optical Systems ◽  
Optical Aberrations ◽  
Optical Surfaces ◽  
Atmospheric Disturbances ◽  
Simulation Based ◽  
Segmented Mirror ◽  
Multidisciplinary Simulation ◽  
And Control ◽  
Optical Unit

Abstract This work deals with the simulation-based investigation and control of optical systems that are mechanically influenced. Here, the focus is on the dynamic-optical modeling of vibration-sensitive, segmented mirror systems, which are used, for example, in large astronomic telescopes. Furthermore, an adaptive optical unit usually compensates for the optical aberrations due to atmospheric disturbances. In practice, these aberrations are detected and corrected within a few seconds using deformable mirrors. However, to further improve the performance of these optical systems, dynamic disturbances in the mechanics, i.e. small movements and deformations of the optical surfaces, must also be taken into account. For the investigation of such cases, multidisciplinary simulation methods are developed and presented.

Design of Athermalized Infrared Telephoto Lens

2013 ◽  
Vol 552 ◽  
pp. 8-13
Author(s):  
Yu Zhang ◽  
Ji Yang Shang ◽  
Yue Xu ◽  
Wen Sheng Wang
Keyword(s):  
Image Quality ◽  
Optical System ◽  
Power Distribution ◽  
Focal Length ◽  
Diffraction Limit ◽  
Field Of View ◽  
Optical Systems ◽  
Modulation Transfer ◽  
Full Field ◽  
Telephoto Lens

IR optical system is much more appropriate to be applied in cluttered and formidable conditions. The change of temperature could degrade image quality of the infrared optical system. So the athermalization becomes the difficult part and key factor in the designing of MWIR optical systems for working under temperature range of -40°C~60°C. In this paper, the infrared telephoto lens is designed; it meets the designing requirements and has good image quality. The effective focal length is 240mm and the F-number is 2.The full field of view is 3.2°. In order to balance the chromatic aberration, an aspherical surface is used in the athermalized infrared optical system. Through carefully selected optical material and reasonable optical power distribution, passive optical athermalization can be realized. The curve of MTF is close to diffraction limit. Within the working temperature, the value of MTF at 30cy/mm is always large than 0.6. The results show that the modulation transfer function (MTF) of optical system in all field of view approaches the diffraction limit at different temperature, and 80% energy concentrates in 1 pixel.

Spectroscopic Observations of Visual Double Stars

1965 ◽  
Vol 5 ◽  
pp. 109-111
Author(s):  
Frederick R. West
Keyword(s):  
Radial Velocity ◽  
High Dispersion ◽  
Velocity Difference ◽  
Spectrograph Slit ◽  
Spectroscopic Observations ◽  
Double Stars ◽  
Visual Double Stars ◽  
Relative Orbit ◽  
Two Component ◽  
Star Images

There are certain visual double stars which, when close to a node of their relative orbit, should have enough radial velocity difference (10-20 km/s) that the spectra of the two component stars will appear resolved on high-dispersion spectrograms (5 Å/mm or less) obtainable by use of modern coudé and solar spectrographs on bright stars. Both star images are then recorded simultaneously on the spectrograph slit, so that two stellar components will appear on each spectrogram.

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