MarcoPolo-R narrow angle camera: a three-mirror anastigmat design proposal with a smart finite conjugates refocusing optical system

Jacopo Antichi; Massimiliano Tordi; Demetrio Magrin; Roberto Ragazzoni; Gabriele Cremonese

doi:10.1117/12.981180

18 December 2012 MarcoPolo-R narrow angle camera: a three-mirror anastigmat design proposal with a smart finite conjugates refocusing optical system

Jacopo Antichi, Massimiliano Tordi, Demetrio Magrin, Roberto Ragazzoni, Gabriele Cremonese

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Proceedings Volume 8550, Optical Systems Design 2012; 85501H (2012) https://doi.org/10.1117/12.981180
Event: SPIE Optical Systems Design, 2012, Barcelona, Spain

Abstract

MarcoPolo-R is a medium-class space mission proposed for the 2015-2025 ESA Cosmic Vision Program with primary goal to return to Earth an unaltered sample from a primitive near-Earth asteroid (NEA). Among the proposed instruments on board, its narrow-angle camera (NAC) should be able to image the candidate object with spatial resolution of 3 mm per pixel at 200 m from its surface. The camera should also be able to support the lander descent operations by imaging the target from several distances in order to locate a suitable place for the landing. Hence a refocusing system is requested to accomplish this task, extending its imaging capabilities. Here we present a three-mirror anastigmat (TMA) common-axis optical design, providing high-quality imaging performances by selecting as entrance pupil the system aperture stop and exploiting the motion of a single mirror inside the instrument to allow the wide image refocusing requested, from infinity up to 200 m above the NEA surface. Such proposal matches with the NAC technical specifications and can be easily implemented with present day technology.

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Jacopo Antichi, Massimiliano Tordi, Demetrio Magrin, Roberto Ragazzoni, and Gabriele Cremonese "MarcoPolo-R narrow angle camera: a three-mirror anastigmat design proposal with a smart finite conjugates refocusing optical system", Proc. SPIE 8550, Optical Systems Design 2012, 85501H (18 December 2012); https://doi.org/10.1117/12.981180

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KEYWORDS

Mirrors

Modulation transfer functions

Cameras

Optical components

Actuators

Imaging systems

Optical design

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