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Guiding system.

The autoguider system in the Cassegrain A&G box cannot be employed when the fibre system is used with ISIS, due to the size of the LARGEFEED mirror.

The guiding system consists of three fibre bundles - two semicoherent and one coherent - to carry the image of three stars to a CCD camera. The image of the guide star, obtained with the coherent bundle, can be use by the TV software to generate error signals for the telescope control computer, in order to improve the tracking of the telescope. This image and the two semi-coherent ones can also be used for the set up of the telescope rotator (see section 9.6.2) and for the acquisition of the field (see section 9.6.3).

The guiding system includes:



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Fri Jan 7 15:34:48 GMT 1994