SWIR objective design using seidel aberration theory

Download

index.pdf

Date

2016

Author

Aslan, Serhat Hasan

Metadata

Show full item record

Item Usage Stats

302
views

263
downloads

Optical systems are used for increasing the situational awareness and Intelligence, Surveillance and Reconnaissance (ISR) capabilities for military purposes. MWIR (Midwave infrared) and LWIR (Long wave infrared) waveband informations are the first two wavebands information in the atmospheric transmission window that are harnessed in military night vision optical systems. Another candidate of these operable wavebands is the SWIR (Shortwave infrared). Shortwave infrared (SWIR) imaging is an extension of Near Infrared (NIR) and visible (VIS) imaging applications and SWIR waveband is defined between 0.9-1.7 m for InGaAs SWIR detectors. SWIR radiation in the atmosphere is based on atmospheric night glow which is a phenomenon created by the hydroxyl ion emissions in the upper atmosphere. There are benefits of SWIR such as fog and haze penetration, cloud and smoke penetration over NIR, VIS, MWIR and LWIR bands. A SWIR objective optical design process is outlined in this thesis using Seidel aberration theory or namely third order aberration theory starting from the thin lens predesign. First, typical optical layouts are discussed with respect to certain optical specifications. Using paraxial optical relations, optical design is finalized using ideal lenses. Aberrations in an optical design are defined in terms of wavefront expansions in order to correct aberrations methodologically. Third order components of wavefront expansion are considered initially and corrected by the thin lens parameters of the paraxial design. Ideal thin lenses are realized and thickened by using the thin lens parameters which are calculated in third order analysis. After thirdorder components are corrected perfectly, fifth order aberrations are balanced with third order aberrations using numerical optimization routines. Finally, tolerancing procedure is discussed and as built imaging quality of the optical design is calculated by tolerancing procedure.

Subject Keywords

Optics., Aberration., Optical detectors., Infrared technology.

URI

http://etd.lib.metu.edu.tr/upload/12620047/index.pdf
https://hdl.handle.net/11511/25706

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Cyber Warfare Integration to Conventional Combat Modeling: A Bayesian Framework Sengul, Zafer; Acartürk, Cengiz (2021-01-01) © 2021 IEEE.Malware propagation is capable of introducing adverse effects in military operations since today's high-tech military weapons and command, control, and communication systems are essentially interconnected ICT systems. Conventional warfare models have been recently upgraded to include cyber warfare elements to reflect the potential influence of cyber-attacks. In the present study, we propose and evaluate a framework for modeling the integrated effect of the spread of malware through computer netw...
Multi-aspect data fusion applied to electromagnetic target classification using enetic algorithm Sayan, Gönül (2000-07-07) Electromagnetic target detection and classification is an important problem relevant not only to military applications but also to civilian use. In the problem of a breast tumor detection and identification [1], for instance, the main concern is accuracy. In the case of the recognition of a military target such as an aircraft or a ship, on the other hand, speed of classification is as important as the accuracy of the decision as such a decision should be made within a fraction of a second. For the K-pulse t...
Multi-Aspect Data Fusion Applied to Electromagnetic Target Classification using Enetic Algorithm Sayan, Gönül (Kluwer Academic Publishers, 2002-01-01) Electromagnetic target detection and classification is an important problem relevant not only to military applications but also to civilian use. In the problem of a breast tumor detection and identification [1], for instance, the main concern is accuracy. In the case of the recognition of a military target such as an aircraft or a ship, on the other hand, speed of classification is as important as the accuracy of the decision as such a decision should be made within a fraction of a second. For...
Infrared low observable material design, synthesis and characterization Keskin, Ahmet; Ünalan, Hüsnü Emrah; Bek, Alpan; Department of Metallurgical and Materials Engineering (2023-1-27) In recent years, infrared low-observable technology has come to the fore in the aerospace and defense industry to conceal military aircraft against rapidly developing infrared search and tracking systems. Pigment materials developed for coatings applied to aircraft surfaces based on materials science and engineering in line with electromagnetic principles play a crucial role in this regard. Although low-observable structures were obtained in the 8-14 µm infrared wavelength range in particle studies, radar a...
Self-recurrent wavelet neural network based indirect adaptive control architecture with modified adaptive learning rates for the speed control of motion platforms Arı, Evrim Onur; Kocaoğlan, Erol; Department of Electrical and Electronics Engineering (2015) Motion platforms are widely employed in military systems for the purpose of controlling payloads like optical sensors, antennas, guns etc. One of the most critical components of these platforms is the motion control sub-system which is responsible for controlling the speed of the platform. In this thesis, the components of the speed control are investigated in detail and finally a novel control architecture was proposed in order to improve the transient performance of the speed control without any adverse e...

Citation Formats

S. H. Aslan, “SWIR objective design using seidel aberration theory,” M.S. - Master of Science, Middle East Technical University, 2016.