Wavefront Control With Realistic Spatial Light Modulator in a Multi-aperture Imager
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| Language: | English |
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University of Dayton / OhioLINK
2012
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| Online Access: | http://rave.ohiolink.edu/etdc/view?acc_num=dayton1355243952 |
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ndltd-OhioLink-oai-etd.ohiolink.edu-dayton13552439522021-08-03T05:35:56Z Wavefront Control With Realistic Spatial Light Modulator in a Multi-aperture Imager Wu, Guimin Optics Wavefront control SLM multi-aperture imaging beam steering conformal aperture A multi-aperture imaging system with a non-mechanical steering device replacing each lens sub-aperture was considered. This setup allows for focusing and tracking of a target over a fine angle while preserving high resolution imaging in a compact system. An imaging system has the ability to digitally add focus for receiving. However, in the case of transmitting the focus must be provided by optical components. Even when receiving, at a short enough range it might be necessary to introduce optical corrections to avoid phase aliasing. To this end, the effects of implementing a real device such as the BNS Spatial Light Modulator (SLM), a reflective 512x512 pixels with 83.4% area fill factor steering device, on the multi aperture imaging system were investigated. The pixelated phase of the SLM, and the use of 2π resets to provide stepped blazed phase profiles for steering and stepped quadratic phase focusing, are modeled. Each pixel of the SLM is modeled by an array of 10x10 elements with 9 active and 1 inactive in both the x and y direction. As expected, and shown by the simulation results, the periodic reset of the quadratic phase bowl introduced phase grating modulations, which produces the so call “ghost image” around the center image. By only providing stepped blazed profile to steer, the simulation shows that with increasing phase steps within the blazed profile the diffraction efficiency increase but at the cost of decreased steering angles. The ability of the SLM to correct for aberrations and its limitation in correcting aberration is investigated. Further, the basic concept of conformal aperture, enabled by the multi-aperture, was investigated and simulated. 2012 English text University of Dayton / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=dayton1355243952 http://rave.ohiolink.edu/etdc/view?acc_num=dayton1355243952 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws. |
| collection |
NDLTD |
| language |
English |
| sources |
NDLTD |
| topic |
Optics Wavefront control SLM multi-aperture imaging beam steering conformal aperture |
| spellingShingle |
Optics Wavefront control SLM multi-aperture imaging beam steering conformal aperture Wu, Guimin Wavefront Control With Realistic Spatial Light Modulator in a Multi-aperture Imager |
| author |
Wu, Guimin |
| author_facet |
Wu, Guimin |
| author_sort |
Wu, Guimin |
| title |
Wavefront Control With Realistic Spatial Light Modulator in a Multi-aperture Imager |
| title_short |
Wavefront Control With Realistic Spatial Light Modulator in a Multi-aperture Imager |
| title_full |
Wavefront Control With Realistic Spatial Light Modulator in a Multi-aperture Imager |
| title_fullStr |
Wavefront Control With Realistic Spatial Light Modulator in a Multi-aperture Imager |
| title_full_unstemmed |
Wavefront Control With Realistic Spatial Light Modulator in a Multi-aperture Imager |
| title_sort |
wavefront control with realistic spatial light modulator in a multi-aperture imager |
| publisher |
University of Dayton / OhioLINK |
| publishDate |
2012 |
| url |
http://rave.ohiolink.edu/etdc/view?acc_num=dayton1355243952 |
| work_keys_str_mv |
AT wuguimin wavefrontcontrolwithrealisticspatiallightmodulatorinamultiapertureimager |
| _version_ |
1719422316320915456 |