Aug 27 – 29, 2018
Paris, France
Europe/Paris timezone

Prospects on future instrumentation for the Solar Spectrum measurement

Aug 29, 2018, 11:10 AM
Charpak room (Paris, France)

Charpak room

Paris, France

Pierre and Marie Curie campus Sorbonne University
talk Session 3: Small satellite missions, future missions and challenges Session 3: Small satellite missions


Mr Nuno José Pereira (BIRA-IASB)


The SOLAR/SOLSPEC instrument, on board the International Space Station measuring the Solar Spectral Irradiance (SSI) from the UV to the NIR has been decommissioned last February 2017. A direct consequence is that no more European instrumentation are contributing to the SSI measurement. Monitoring of the UV spectrum variability is a fundamental input for the stratospheric ozone chemistry. Such instrumentation, however, represented a major challenge in terms of calibration but also regarding space environment related degradation issues. Therefore, there is an urgent need to develop a new generation of instruments measuring the SSI, using already developed, sound and compact technologies in order to minimize cost and size, able to fit in CubeSat-like missions. We propose Acoustic Optic Tunable Filter (AOTF) crystals as technological solution for being the central wavelength selection device of a new generation of SSI instruments. AOTF crystal-based spectrometers do not require optical moving parts presenting therefore an advantage over the often bulky optical design of holographic gratings-based spectrometers. They also provide fast spectral scans, are compact and robust with low power consumption. The high Technological Readiness Level (TRL) of the AOTF in the infrared range, is a heritage of successful planetary observation missions instruments such as SOIR on Venus Express (VEx) and NOMAD on ExoMars Trace Gas Orbiter. AOTFs are functional in the visible part of the spectrum and are currently under development for the ultraviolet range. A quantification of the in-flight performances of SOIR during the whole Vex mission, focusing on the radiometric stability of the AOTF and performances of the light detection chain as well as a discussion on the advantages and drawbacks of AOTF compared to current SSI instruments is presented.

Primary author

Mr Nuno José Pereira (BIRA-IASB)


Dr Ann Carine Vandaele (BIRA-IASB) Dr Arnaud Mahieux (BIRA-IASB) Mr David Bolsée (BIRA-IASB) Dr Dominique Sluse (IASB) Dr Emmanuel Dekemper (BIRA-IASB) Dr Gaël Cessateur (BIRA-IASB) Mr Loïc Trompet (BIRA-IASB)

Presentation materials