The ALTIUS Mission (Atmospheric Limb Tracker for Investigation of the Upcoming Stratosphere) aims at the development of a limb sounder based on a small satellite concept to monitor the distribution and evolution of stratospheric ozone at high vertical resolution in support of operational services and long-term trend monitoring. The ALTIUS instrument consists of three spectral imagers flying at an altitude of approximately 700 km Sun-Synchronous Orbit. The three hyperspectral channels are based on Acousto-Optic Tuneable Filters (AOTFs) in the Visible (440-675nm) and NIR (600-1020nm) range, and a cascade of Fabry-Pérot Interferometers (FPI) in the UV (250-355nm). The use of tuneable active spectral filters will allow the ALTIUS Instrument to perform observations with a spectral resolution ranging between 1nm and 10nm in an extremely versatile operational concept. This paper presents the key technical challenges to be controlled on the design and technologies of the ALTIUS 2D imager for limb sounding. A particular insight will be given on its optical concept including the choice of tuneable spectral filters in each channel and the key development of optical elements such as mirrors, filters and coatings, ensuring the straylight performances of the instrument. The paper also provides a deep dive into the structural and thermal design of the instrument ensuring the pointing accuracy, and the way to achieve L1 radiometric performances from L0 instrument performances through calibration needs and data processing strategies. Along the lines, the stringent cleanliness and contamination control and related envisaged strategy to ensure sustained optical performances will be also described
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.