Mora, A;
Biermann, M;
Brown, AGA;
Busonero, D;
Carminati, L;
Carrasco, JM;
Chassat, F;
... Vosteen, LLA; + view all
(2014)
Gaia on-board metrology: basic angle and best focus.
In: Oschmann, JM and Clampin, M and Fazio, GG and MacEwen, HA, (eds.)
Space Telescopes and Instrumentation 2014: Optical, Infrared, and Millimeter Wave.
SPIE: Montréal, Canada.
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Abstract
The Gaia payload ensures maximum passive stability using a single material, SiC, for most of its elements. Dedicated metrology instruments are, however, required to carry out two functions: monitoring the basic angle and refocusing the telescope. Two interferometers fed by the same laser are used to measure the basic angle changes at the level of μas (prad, micropixel), which is the highest level ever achieved in space. Two Shack- Hartmann wavefront sensors, combined with an ad-hoc analysis of the scientific data are used to define and reach the overall best-focus. In this contribution, the systems, data analysis, procedures and performance achieved during commissioning are presented.
| Type: | Proceedings paper |
|---|---|
| Title: | Gaia on-board metrology: basic angle and best focus |
| Event: | SPIE Astronomical Telescopes + Instrumentation, 2014 |
| Location: | Montreal, CANADA |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1117/12.2054602 |
| Publisher version: | https://doi.org/10.1117/12.2054602 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10076762 |
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