Publications associated with Visible and Infrared Instruments


The hardware control system for WEAVE at the William Herschel telescope

SPIE Astronomical Telescopes + Instrumentation 2018 Society of Photo-optical Instrumentation Engineers (2018)

JM Delgado, SM Mendoza, JA Burgal, JM Herreros, S Picó, DC Abrams, C Martin, D Cano, FJ Gribbin, J Skvarc, K Dee, E Lhome, G Dalton, K Middleton, S Trager, JAL Aguerri, P Bonifacio, A Vallenari, E Carrasco

When an alt-azimuth telescope is tracking at a specific field, it is necessary to use a de-rotator system to compensate the Earth’s rotation of the field of view. In order, to keep the telescope tracking the field of view selected, the instrument will need to a rotation system for compensating it [1]. The new WEAVE [2] two degrees field of view requires a new field de-rotator on the top-end of the telescope. The rotator system has been designed with a direct drive motor which eliminates the need for mechanical transmission elements such as gearboxes, speed reducers, and worm gear drives. This design is a huge advantage for the system performance and lifetime because it eliminates undesirable characteristics such as long-time drift, elasticity, and backlash. The hardware control system has been developed with a Rockwell servo-drive and controller. The rotator has to be controlled by the high-level software which is also responsible for the telescope control. This paper summarizes the model developed for simulating and the software which will be used to accept the rotator system. A performance study is also carried out to test the CIP (Common Industrial Protocol) for communications between the high-level software and the rotator hardware.


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