The Fresnel Zone Light Field Spectral Imager
Air Force Institute of Technology WPAFB United States
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This thesis provides a computational model and the first experimental demonstration of a Fresnel zone light field spectral imaging FZLFSI system. This type of system couples an axial dispersion binary diractive optic with light field plenoptic camera designs providing a snapshot spectral imaging capability. A computational model of the system was developed based on wave optics methods using Fresnel propagation. It was validated experimentally and provides excellent demonstration of system capabilities. The experimentally demonstrated system was able to synthetically refocus monochromatic images across greater than a 100nm bandwidth. Furthermore, the demonstrated system was modeled to have a full range of approximately 400 to 800nm with close to a 15nm spectral sampling interval. Experimental demonstration also showed the capability to resolve between and process two dierent spectral signatures from a single snapshot. For future FZLFSI designs, the study noted there is a fundamental design trade-off, where improved spectral and spatial resolution reduces the spectral range of the system.