SALT segmented primary mirror: commissioning capacitive edge sensing system and performance comparison with inductive sensor

Sebastien Buous; John Menzies; Hitesh Gajjar

doi:10.1117/12.788909

10 July 2008 SALT segmented primary mirror: commissioning capacitive edge sensing system and performance comparison with inductive sensor

Sebastien Buous, John Menzies, Hitesh Gajjar

Author Affiliations +

Proceedings Volume 7012, Ground-based and Airborne Telescopes II; 70123G (2008) https://doi.org/10.1117/12.788909
Event: SPIE Astronomical Telescopes + Instrumentation, 2008, Marseille, France

Abstract

The SAMS (Segment Alignment Measurement System) is a capacitance-based edge sensing solution for the active alignment of the 10m SALT segmented primary mirror. Commissioning and calibrating the system has been an ongoing task in an attempt to counteract the unfavourable response of the sensors to high humidity conditions and high dust levels. Several solutions were implemented and tested including real-time feedback systems and the application of corrective functions. In parallel with the continuing efforts to improve the performance of the capacitive sensors, we have also been testing a prototype inductive sensor developed by Fogale Nanotech that is of a very similar flexible plate construction. In this paper we present the results obtained and performance gains achieved thus far with the capacitive edge-sensing system as well as a performance comparison of the Fogale inductive sensor to the capacitive edge sensor.

Citation Download Citation

Sebastien Buous, John Menzies, and Hitesh Gajjar "SALT segmented primary mirror: commissioning capacitive edge sensing system and performance comparison with inductive sensor", Proc. SPIE 7012, Ground-based and Airborne Telescopes II, 70123G (10 July 2008); https://doi.org/10.1117/12.788909

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