Design and integration of a SWIR objective lens for the space-borne DRAGO-2 optical system

Paloma Matia-Hernando; Zaira M. Berdiñas; Alfonso Ynigo; Pablo González de Chaves; Carlos Sánchez; Adrián Vizuete; Jorge Oriol; Thomas Siegel; Marta de la Fuente

doi:10.1117/12.2677298

5 October 2023 Design and integration of a SWIR objective lens for the space-borne DRAGO-2 optical system

Paloma Matia-Hernando, Zaira M. Berdiñas, Alfonso Ynigo, Pablo González de Chaves, Carlos Sánchez, Adrián Vizuete, Jorge Oriol, Thomas Siegel, Marta de la Fuente

Author Affiliations +

Proceedings Volume 12689, CubeSats, SmallSats, and Hosted Payloads for Remote Sensing VII; 1268907 (2023) https://doi.org/10.1117/12.2677298
Event: SPIE Optical Engineering + Applications, 2023, San Diego, California, United States

Abstract

We present the design of the objective lens for the DRAGO-2 optical system, a compact SWIR camera designed for the space environment. DRAGO-2 is the long-focal variant of the DRAGO (Demonstrator of Remote Analysis of Ground Observations) series, developed for the ALISIO-1 mission of the IACTEC-Space team at the Instituto de Astrofísica de Canarias (IAC). The objective lens has a refractive design covering the two bands in the SWIR range (1.1 and 1.6 μm) which is passively athermalized for operation between -20 °C and 40 °C, with a focal length of 150 mm and a focal length variation over the whole temperature range of under 0.2%. The system has an f/# of 4.5, both transmission and relative illumination above 90%, and low distortion under 0.05%. The optical quality is excellent, with an as-built modulation transfer function (MTF) value at 30 cy/mm over 55% on axis and over 40% at the edge of the 6.2 mm diagonal image field to ensure pixel-limited performance. Straylight and finite-element analysis ensure optimal optical performance as well as survival to the environment. Several units of the objective lens have been manufactured with special attention to environmental requirements in terms of both assembly processes and material selection, and their optical performance has been found to be in excellent compliance with the projected as-built optical quality.

Conference Presentation

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Paloma Matia-Hernando, Zaira M. Berdiñas, Alfonso Ynigo, Pablo González de Chaves, Carlos Sánchez, Adrián Vizuete, Jorge Oriol, Thomas Siegel, and Marta de la Fuente "Design and integration of a SWIR objective lens for the space-borne DRAGO-2 optical system", Proc. SPIE 12689, CubeSats, SmallSats, and Hosted Payloads for Remote Sensing VII, 1268907 (5 October 2023); https://doi.org/10.1117/12.2677298

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