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30 September 2004 INGRID: retrofitting an improved mechanism control system to an operational cryogenic instrument
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This paper describes an engineering programme to retrofit an improved mechanism control system to the Isaac Newton Group Red Imaging Device (INGRID), the infrared camera at the William Herschel Telescope. INGRID is an operational instrument and engineering upgrades need to be considered carefully with a view to minimising risks to the instrument and ensuring that it is back in service on the due date. A number of alternative mechanical arrangements were considered; different stepper motor candidates were assessed together with the electronics to drive them. Motor drive parameters were optimised to increase the speed of optical setup. Finally, different technologies were considered for improving the arrangements for sensing the position of the instrument's mechanism wheels. The paper reports on the results of this programme and lessons learned.
© (2004) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Simon G. Rees, Paul Jolley, Michiel van der Hoeven, Andy Ridings, and Maarten Blanken "INGRID: retrofitting an improved mechanism control system to an operational cryogenic instrument", Proc. SPIE 5492, Ground-based Instrumentation for Astronomy, (30 September 2004);


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