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http://dx.doi.org/10.3807/COPP.2022.6.3.313

Through-field Investigation of Stray Light for the Fore-optics of an Airborne Hyperspectral Imager  

Cha, Jae Deok (Department of Optical Engineering, Kongju National University)
Lee, Jun Ho (Department of Optical Engineering, Kongju National University)
Kim, Seo Hyun (Core H/W Team, Hanwha Systems Co.)
Jung, Do Hwan (Core H/W Team, Hanwha Systems Co.)
Kim, Young Soo (Space Surveillance System TF Team, Hanwha Systems Co.)
Jeong, Yumee (Defense Space Technology Center, Agency for Defense Development)
Publication Information
Current Optics and Photonics / v.6, no.3, 2022 , pp. 313-322 More about this Journal
Abstract
Remote-sensing optical payloads, especially hyperspectral imagers, have particular issues with stray light because they often encounter high-contrast target/background conditions, such as sun glint. While developing an optical payload, we usually apply several stray-light analysis methods, including forward and backward analyses, separately or in combination, to support lens design and optomechanical design. In addition, we often characterize the stray-light response over a full field to support calibration, or when developing an algorithm to correct stray-light errors. For this purpose, we usually use forward analysis across the entire field, but this requires a tremendous amount of computational time. In this paper, we propose a sequence of forward-backward-forward analyses to more effectively investigate the through-field response of stray light, utilizing the combined advantages of the individual methods. The application is an airborne hyperspectral imager for creating hyperspectral maps from 900 to 1700 nm in a 5-nm-continuous band. With the proposed method, we have investigated the through-field response of stray light to an effective accuracy of 0.1°, while reducing computation time to 1/17th of that for a conventional, forward-only stray-light analysis.
Keywords
Ghost analysis; Hyperspectral imager; Ray tracing; Stray light analysis;
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