Mr. Benjamin Daire Profile

Benjamin Daire

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Proceedings Article | 17 June 2024 Poster + Paper

Design, manufacturing, and testing of a compact annular telescope

Karine Mathieu, Jacques Berthon, Daniel Mouricaud, Jean-Luc Vavrille, Benjamin Daire

Proceedings Volume 13019, 1301921 (2024) https://doi.org/10.1117/12.3016938

KEYWORDS: Manufacturing, Telescopes, Design, Prototyping, Optics manufacturing, Sensors, Optical surfaces, Imaging systems, Image resolution, Image quality

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With the aim of constantly reducing the prices and manufacturing times of space optical instruments, CNES has carried out research and development activities to evaluate new optical concepts for medium-resolution imaging applications. In reality, this study had two objectives. The first consisted of defining a disruptive optical architecture to significantly improve the compactness of telescopes. For this, we decided to target annular telescopes, which offer great compactness with a large numerical aperture, very interesting characteristics for small instruments. The second objective sought was to test a new manufacturing process, which will speed up production times. This is why the diamond turning point was chosen to create the prototype. We will therefore first present the optical design compromise between two interesting solutions for imaging applications. Detailed analyses were performed with optical software tools to prepare manufacturing files. In a second part, a description of the finalized prototype will be provided. It will focus on the opto-mechanical principle but also on the manufacturing quality obtained with diamond machining. Finally, we will detail all the characterizations on the prototype with and without sensor: optical performances evaluated in the laboratory as well as a set of images acquired on different realistic scenes. We will conclude and present perspectives for future versions.

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