Optical design study for the 1-5 μm spectral band

2009 ◽  
Author(s):  
Miguel P. Snyder ◽  
Jay N. Vizgaitis
Keyword(s):  
Optical Design ◽  
Spectral Band ◽  
Design Study

Optical design study in the 1-5μm spectral band with gradient-index materials

2014 ◽  
Author(s):  
Peter McCarthy ◽  
Rebecca Berman ◽  
Daniel J. L. Williams ◽  
Anthony Yee ◽  
Duncan T. Moore
Keyword(s):  
Optical Design ◽  
Spectral Band ◽  
Gradient Index ◽  
Design Study

Optical design study for divertor observation at the stellarator W7-X

2006 ◽  
Vol 77 (10) ◽  
pp. 10F121 ◽  
Author(s):  
R. König ◽  
D. Hildebrandt ◽  
T. Hübner ◽  
F. Klinkhamer ◽  
K. Moddemeijer ◽  
...  
Keyword(s):  
Optical Design ◽  
Design Study

scholarly journals Infrared Optical Observability of an Earth Entry Orbital Test Vehicle Using Ground‐Based Remote Sensors

2019 ◽  
Vol 11 (20) ◽  
pp. 2404 ◽  
Author(s):  
Niu ◽  
Meng ◽  
He ◽  
Dong
Keyword(s):  
Detection System ◽  
Optical Design ◽  
Spectral Band ◽  
Radiative Properties ◽  
Design Parameters ◽  
Reacting Flow ◽  
Test Vehicle ◽  
Detection Range ◽  
Order Of Magnitude ◽  
The Difference

Optical design parameters for a ground-based infrared sensor rely strongly on the target’s optical radiation properties. Infrared (IR) optical observability and imaging simulations of an Earth entry vehicle were evaluated using a comprehensive numerical model. Based on a ground-based IR detection system, this model considered many physical mechanisms including thermochemical nonequilibrium reacting flow, radiative properties, optical propagation, detection range, atmospheric transmittance, and imaging processes. An orbital test vehicle (OTV) was selected as the research object for analysis of its observability using a ground-based infrared system. IR radiance contours, maximum detecting range (MDR), and thermal infrared (TIR) pixel arrangement were modeled. The results show that the distribution of IR radiance is strongly dependent on the angle of observation and the spectral band. Several special phenomena, including a strong receiving region (SRR), a characteristic attitude, a blind zone, and an equivalent zone, are all found in the varying altitude MDR distributions of mid-wavelength infrared (MWIR) and long-wavelength infrared (LWIR) irradiances. In addition, the possible increase in detectivity can greatly improve the MDR at high altitudes, especially for the backward and forward views. The difference in the peak radiance of the LWIR images is within one order of magnitude, but the difference in that of the MWIR images varies greatly. Analyses and results indicate that this model can provide guidance in the design of remote ground-based detection systems.

Parasitic Flux Analysis of Cooled Infrared Detectors for Space Applications

2017 ◽  
Vol 67 (2) ◽  
pp. 193
Author(s):  
Ankur Jain ◽  
Amiya Biswas
Keyword(s):  
Infrared Detector ◽  
Optical Design ◽  
Spectral Band ◽  
Low Noise ◽  
Flux Analysis ◽  
Optical Elements ◽  
Space Applications ◽  
Practical Applications ◽  
Spectral Bands ◽  
Infrared Imager

An infrared imager measures radiations emitted by an object in specified spectral bands to determine change in object’s characteristics over a period of time. A typical infrared imager consists of focusing optics and a cryogenically cooled two-dimensional infrared detector array mounted on the cold tip of an active micro-cooler vacuum sealed with an optical window, typically known as integrated detector cooler assembly (IDCA). Detection of feeble radiant flux from the intended target in a narrow spectral band requires a highly sensitive low noise sensor array with high well capacity. However, in practical applications the performance of an infrared imager is limited by the parasitic thermal emissions from optical elements and emissions from IDCA components like vacuum window, Dewar walls which are generally kept at ambient temperature. To optimise the performance of imager it becomes imperative to estimate these parasitic fluxes and take corrective actions to minimise their effects. This paper explains an analytical model developed to estimate parasitic fluxes generated from different components of a long wave infrared imager. Validation of the developed model was carried out by simulations in ZEMAX optical design software using ray trace method after analytical computations in MATLAB.

scholarly journals The EST project

2010 ◽  
Vol 6 (S274) ◽  
pp. 310-313
Author(s):  
Francesca Zuccarello ◽  
Keyword(s):  
Magnetic Field ◽  
High Resolution ◽  
Conceptual Design ◽  
Optical Design ◽  
High Resolution Imaging ◽  
Solar Telescope ◽  
Magnetic Field Generation ◽  
Medium Term ◽  
Design Study ◽  
Resolution Imaging

AbstractEST European Solar Telescope is a pan-european project, presently in its Conceptual Design Study financed by the European Commission in the framework of FP7, involving 29 partners, from 14 different countries. The EST project is aimed at the realization of a 4-m class telescope, characterized by an optical design and a set of instruments optimized for extremely high resolution imaging and spectropolarimetric observations from near UV to NIR. EST will be four times larger than any existing high resolution solar telescope and it is designated with the highest priority among the ground-based, medium term (2016-2020) new projects in the ASTRONET Roadmap (Panel C). The EST instruments will measure fundamental astrophysical processes at their intrinsic scales in the Sun's atmosphere to establish the mechanism of magnetic field generation and removal, and of energy transfer from the surface to the upper solar atmosphere and eventually to the whole heliosphere. The conceptual Design Study started on February 2008 and will finish during 2011. EST will be operational at the same time as major ESA and NASA space missions aimed at studying solar activity.

Optical design study of a VIS-SWIR 3X zoom lens

2015 ◽  
Author(s):  
Rebecca Berman ◽  
James A. Corsetti ◽  
Kejia Fang ◽  
Eryn Fenning ◽  
Peter McCarthy ◽  
...  
Keyword(s):  
Optical Design ◽  
Zoom Lens ◽  
Design Study
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