Optical relay design for an IR imaging diagnostic system in TJ-II fusion device

Carlota Ruiz de Galarreta; Ana Manzanares Ituarte; Eduardo de la Cal Heusch; Macarena Liniers; Gilles Wolfers

doi:10.1117/12.981303

18 December 2012 Optical relay design for an IR imaging diagnostic system in TJ-II fusion device

Carlota Ruiz de Galarreta, Ana Manzanares Ituarte, Eduardo de la Cal Heusch, Macarena Liniers, Gilles Wolfers

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Proceedings Volume 8550, Optical Systems Design 2012; 85501J (2012) https://doi.org/10.1117/12.981303
Event: SPIE Optical Systems Design, 2012, Barcelona, Spain

Abstract

The surroundings of a nuclear fusion reactor experiments the presence of magnetic fields, which affects the performance of any diagnostic optical system located nearby. It is therefore necessary to determine with precision the optimum location for the diagnostic and to design magnetically robust optical imaging systems. The purpose of the present optical diagnostic is to measure the temperature dispersion in the vicinity of the NBI (neutral beam injectors) that heat the confined plasma inside the fusion device. The measure is made by processing the information contained in the images of the objects inside the chamber in the 7 to 16 um far infrared wavelength range, through a F2Ba vacuum viewport window. Our main concern is to design the optical relay from this viewport to the IR sensor, a FPA uncooled microbolometer 320x240px, for different axial distances, with a field of view of 24°x18° and 1.3 mrad of IFOV spatial resolution. The proposed optical relay system includes the use of a reflexive relay (aspheric concave mirrors) and a refractive and imaging camera. The system has being corrected for primary aberrations and optimized to allow a future second optical system working in visible range after the mirrors, by including a dichroic beamsplitter.

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Carlota Ruiz de Galarreta, Ana Manzanares Ituarte, Eduardo de la Cal Heusch, Macarena Liniers, and Gilles Wolfers "Optical relay design for an IR imaging diagnostic system in TJ-II fusion device", Proc. SPIE 8550, Optical Systems Design 2012, 85501J (18 December 2012); https://doi.org/10.1117/12.981303

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KEYWORDS

Infrared cameras

Cameras

Relays

Optical design

Imaging systems

Infrared imaging

Mirrors

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