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Proceedings Paper

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

Paper Details

Date Published: 19 July 2010
PDF: 5 pages
Proc. SPIE 7739, Modern Technologies in Space- and Ground-based Telescopes and Instrumentation, 77390X (19 July 2010); doi: 10.1117/12.859130
Show Author Affiliations
John Menzies, South African Large Telescope, South African Astronomical Observatory (South Africa)
Hitesh Gajjar, South African Large Telescope, South African Astronomical Observatory (South Africa)
Sébastien Buous, South African Large Telescope, South African Astronomical Observatory (South Africa)
David Buckley, South African Large Telescope, South African Astronomical Observatory (South Africa)
Peter Gillingham, South African Large Telescope, South African Astronomical Observatory (South Africa)


Published in SPIE Proceedings Vol. 7739:
Modern Technologies in Space- and Ground-based Telescopes and Instrumentation
Eli Atad-Ettedgui; Dietrich Lemke, Editor(s)

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