SALT segmented primary mirror: laboratory test results for FOGALE inductive edge sensors

John Menzies; Hitesh Gajjar; Sébastien Buous; David Buckley; Peter Gillingham

doi:10.1117/12.859130

19 July 2010 SALT segmented primary mirror: laboratory test results for FOGALE inductive edge sensors

John Menzies, Hitesh Gajjar, Sébastien Buous, David Buckley, Peter Gillingham

Proceedings Volume 7739, Modern Technologies in Space- and Ground-based Telescopes and Instrumentation; 77390X (2010) https://doi.org/10.1117/12.859130
Event: SPIE Astronomical Telescopes + Instrumentation, 2010, San Diego, California, United States

Abstract

At the Southern African Large Telescope (SALT), in collaboration with FOGALE Nanotech, we have been testing the recently-developed new generation inductive edge sensors. The Fogale inductive sensor is one technology being evaluated as a possible replacement for the now defunct capacitance-based edge sensing system. We present the results of exhaustive environmental testing of two variants of the inductive sensor. In addition to the environmental testing including RH and temperature cycles, the sensor was tested for sensitivity to dust and metals. We also consider long-term sensor stability, as well as that of the electronics and of the glue used to bond the sensor to its supporting structure. A prototype design for an adjustable mount is presented which will allow for in-plane gap and shear variations present in the primary mirror configuration without adversely disturbing the figure of the individual mirror segments or the measurement accuracy.

Citation Download Citation

John Menzies, Hitesh Gajjar, Sébastien Buous, David Buckley, and Peter Gillingham "SALT segmented primary mirror: laboratory test results for FOGALE inductive edge sensors", Proc. SPIE 7739, Modern Technologies in Space- and Ground-based Telescopes and Instrumentation, 77390X (19 July 2010); https://doi.org/10.1117/12.859130

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