Optical tests of a space mechanism under an adverse environment: GAIA secondary mirror mechanism under vaccum and thermal controlled conditions

Gonzalo Ramos Zapata; Antonio Sánchez Rodríguez; Tomás Belenguer Dávila; Eduardo Urgoiti; Argiñe Ramírez Quintana

doi:10.1117/12.732048

18 September 2007 Optical tests of a space mechanism under an adverse environment: GAIA secondary mirror mechanism under vaccum and thermal controlled conditions

Gonzalo Ramos Zapata, Antonio Sánchez Rodríguez, Tomás Belenguer Dávila, Eduardo Urgoiti, Argiñe Ramírez Quintana

Author Affiliations +

Proceedings Volume 6671, Optical Manufacturing and Testing VII; 667117 (2007) https://doi.org/10.1117/12.732048
Event: Optical Engineering + Applications, 2007, San Diego, California, United States

Abstract

In this work, the optical evaluation of a mechanism for space applications under vacuum and temperature controlled conditions at the facilities of the Space Instrumentation Laboratory (LINES) of the Aerospace Technical Nacional Institute of Spain (INTA) is reported. The mechanism was developed by the Spanish company SENER to fulfill the high performance requirements from ESA technology preparatory program for GAIA Astrometric Mission; in particular, a five degrees of freedom (dof), three translations and two rotations positioning mechanism for the secondary mirror of the GAIA instrument. Both interferometric tests and autocollimator measurements have been combined in order to extract the information about the accuracy of the mechanism movements as well as their repeatability under adverse environmental conditions: vacuum and thermal controlled conditions, up to a 10^-6mbar and 100K. The scope of this paper will cover the measurements concept selection, the presentation of verification activities, the results of such dedicated optical measurements, the correlation with the mechanical models and a brief description of the design process followed to meet the test requirements.

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Gonzalo Ramos Zapata, Antonio Sánchez Rodríguez, Tomás Belenguer Dávila, Eduardo Urgoiti, and Argiñe Ramírez Quintana "Optical tests of a space mechanism under an adverse environment: GAIA secondary mirror mechanism under vaccum and thermal controlled conditions", Proc. SPIE 6671, Optical Manufacturing and Testing VII, 667117 (18 September 2007); https://doi.org/10.1117/12.732048

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KEYWORDS

Mirrors

Actuators

Aerospace engineering

Finite element methods

Optical testing

Temperature metrology

Interferometers

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