Construction of the FORS Focal Reducer/Spectrographs: status report and first test results

Details Construction of the FORS Focal Reducer/Spectrographs: status report and first test results Construction of the FORS Focal Reducer/Spectrographs: status report and first test results

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997spie.2871.1222n&link_type=abstract

Proc. SPIE Vol. 2871, p. 1222-1230, Optical Telescopes of Today and Tomorrow, Arne L. Ardeberg; Ed.

Computer Science

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8

Scientific paper

The hardware construction of FORS1, the first of the two focal reducer/low dispersion spectrographs of the ESO very large telescope (VLT), is now finished. An extensive testing program is under way which will guarantee that the instrument is fully understood and well calibrated when it will be installed at the Cassegrain focus of the first unit telescope of the VLT in 1998. This program includes a full characterization of the optical system and the evaluation of the setting accuracies and reproducibility of the numerous electromechanical functions as well as testing the flexure compensation which will minimize image shift during telescope motions. Telescope and star simulators were specially built for this purpose in order to test the optical and mechanical behavior of the instrument on the 8 m-telescope. Acceptance tests of the optical performance and the subsystem tests of all electromechanical functions indicate an excellent quality, especially for the complex multi object spectroscopy unit, while the overall system tests are just starting.

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