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Proceedings Paper

Some Optical Test Methods Used In Performance Evaluation Of HIPPARCOS Telescope
Author(s): G. Ratier; J. J. Arnoux; M. Fruit
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Paper Abstract

As the final goal of HIPPARCOS mission is to measure star positions with an extreme accuracy (2 milli-arc sec), severe requirements have been put on the performances of the optical telescope. One of the most stringent requirements applies to the wavelength dependence of the position of the diffraction image given by an all-reflective telescope. After a short introduction relative to this so called "chromaticity" effect and its relation with the wave-front error (WFE) of the telescope, this paper present briefly the various interferometric test methods used at component level to achieve WFE better than λ/60 RMS. Integration of the mirrors in the telescope structure, will be followed by 2 different tests under vacuum = - an interferometric evaluation of the WFE of the telescope followed by S/W derivation of residual chromaticity; - a direct measurement of the wavelength dependance of star position; Sensitivity of both methods are discussed. Possibility of calibration in-orbit is also mentioned.

Paper Details

Date Published: 16 July 1986
PDF: 5 pages
Proc. SPIE 0599, Optics in Engineering Measurement, (16 July 1986); doi: 10.1117/12.952395
Show Author Affiliations
G. Ratier, European Space Agency (ESTEC) (The Netherlands)
J. J. Arnoux, MATRA Space Centre (France)
M. Fruit, MATRA Space Centre (France)

Published in SPIE Proceedings Vol. 0599:
Optics in Engineering Measurement
William F. Fagan, Editor(s)

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