Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986spie..627..278b&link_type=abstract
IN: Instrumentation in astronomy VI; Proceedings of the Meeting, Tucson, AZ, Mar. 4-8, 1986. Part 1 (A87-36376 15-35). Bellingha
Astronomy and Astrophysics
Astronomy
Automatic Control, Gratings (Spectra), Spectroscopic Telescopes, Accuracy, Actuators, Cassegrain Antennas, Faint Objects, Numerical Control
Scientific paper
A multislit unit is being constructed for use with spectrographs on the 2.5 m telelscope at the Observatorio del Roque de los Muchachos. It will make possible the simultaneous observation of up to 12 spectra. The complete unit will fit into the available space on the telescope as a replacement for the conventional slit assembly. The area of the focal plane over which the slits move is 40 x 30 mm, corresponding to 4 x 3 arc min at the f/15 Cassegrain focus. Each slit has length 2 mm and can be set to within 18 microns of the required position. The slits are moved in the dispersion direction by wires pulled by linear actuators. The position of a slit is encoded from the voltage on an accurate potentiometer connected to the wire. Control is by a 6809 microprocessor which continuously monitors the position of each slit and adjusts it if necessary. The telescope main instrument computer will be used to translat object coordinates into encoded positions.
Breare J. M.
Ellis Richard S.
Miller Warner
Purvis Alan
Webb D. A.
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