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Instrument Pre-Develpment Activities for FLEX Mission
The FLuorescence Imaging Spectrometer (FLORIS) is the payload of the FLuorescence Explorer Mission (FLEX) of the European Space Agency. The mission objective is to perform quantitative measurements of the solar induced vegetation fluorescence aiming at monitoring photosynthetic activity. FLORIS works in a push-broom configuration and it is designed to acquire data in the 500–780 nm spectral range with a sampling of 0.1 nm in the oxygen bands (759–769 nm and 686-697 nm) and 0.5–2.0 nm in the Red Edge, Chlorophyll Absorption and Photochemical Reflectance Index bands. FLEX will fly in formation with Sentinel-3 to benefit from the measurements made by Sentinel-3 instruments, OLCI and SLSTR, particularly concerning the cloud screening, the proper characterization of the atmospheric state and the determination of the surface temperature. The instrument concept is based on a common telescope and two modified Offner spectrometers with reflective concave gratings both for the High Resolution (HR) and Low Resolution (LR) spectrometers. In the frame of the instrument pre-development Leonardo Company (I) has built and tested an elegant breadboard of the instrument consisting of the telescope and the HR spectrometer. The development of the LR spectrometer is in charge of OHB System AG (D) and is currently under test. The main objectives of the activity are: anticipate the development of the instrument and provide early risk retirement of critical components, evaluate the system performances such as imaging quality parameters, straylight, ghost, polarization sensitivity and environmental influences, verify the adequacy of critical tests such as spectral characterization and straylight, define and optimize instrument alignment procedures. Following a brief overview of the FLEX mission, the paper will cover the design and the development of the optics breadboard with emphasis on the results obtained during the tests and the lessons learned for the flight unit.
Coppo Peter Mario, Pettinato Lucia, Nuzzi Davide, Fossati Enrico, Taiti Alessio, Gabrieli Riccardo, Campa Annamaria, Taccola Matteo, Bézy Jean-Loup, Francois Michael, Erdmann Lars, Triebel Peter, Lehr Dennis
Paper for Specialistic Magazine
Optical Engineering (SPIE - The International Society for Optics and Photonics)
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