The PICARD/SODISM Pointing Mechanism: From the Design to the Flight Performances

Abstract : PICARD is a French space scientific mission. Its objectives are the study of the origin of the solar variability and the study of the relations between the Sun and the Earth's climate. The Satellite was successfully launched, on June 15, 2010 on a DNEPR launcher from Dombarovskiy Cosmodrome, near Yasny (Russia). The payload consists in two absolute radiometers measuring the total solar irradiance and an imaging telescope to determine the solar diameter and asphericity. SODISM (SOlar Diameter Imager and Surface Mapper) is a 11 cm Ritchey-Chretien imaging telescope associated with a CCD, taking solar images at five wavelengths. It carries a four-prism system to ensure a metrological control of the optics magnification. The first image of the Sun with this new instrument was taken on July 22, 2010. A mechanism of this instrument is the subject of the presentation. Current and future space telescope mission require ever-higher dimensionally stable structures. CNRS aims to design, manufacture and test a very high dimensional stability telescope for precision optical systems using advanced materials combining high dimensional stability and good structural performance. To achieve these accurate measurements, SODISM includes a fine pointing mechanism, based on the piezoelectric technology. This paper covers the description of the SODISM instrument, the design and the qualification of the pointing mechanism, and the flight results (commissioning phase and in orbit validation phase).
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Mustapha Meftah, Abdanour Irbah, R. Le Letty, A. Bataille, Emmanuel Ducourt, et al.. The PICARD/SODISM Pointing Mechanism: From the Design to the Flight Performances. ESMATS 2011, 14th European Space Mechanisms and Tribology Symposium 2011, Sep 2011, Constance, Germany. 8 pp. ⟨hal-00640497⟩

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