Optical calibration of capacitive sensors for AO: strategy and preliminary results

Runa Briguglio; Marco Xompero; Armando Riccardi; Roberto Biasi; Mario Andrighettoni

doi:10.1117/12.926820

13 September 2012 Optical calibration of capacitive sensors for AO: strategy and preliminary results

Runa Briguglio; Marco Xompero; Armando Riccardi; Roberto Biasi; Mario Andrighettoni;

Author Affiliations +

Proceedings Volume 8447, Adaptive Optics Systems III; 84474E (2012) https://doi.org/10.1117/12.926820
Event: SPIE Astronomical Telescopes + Instrumentation, 2012, Amsterdam, Netherlands

Abstract

LBT contactless, voice-coil actuators working point ranges from 10 to 100 μm, with a typical position noise of a few nm. To fully take advantage of such large working range in AO operations, an absolute calibration of their capacitive sensor is requested. We implemented and tested an optical calibration technique that is based on a fast interferometer detection of a differential piston superimposed to a low order mirror mode. This procedure has been tested in dome environment at the Large Binocular Telescope.

Citation Download Citation

Runa Briguglio, Marco Xompero, Armando Riccardi, Roberto Biasi, Mario Andrighettoni, "Optical calibration of capacitive sensors for AO: strategy and preliminary results", Proc. SPIE 8447, Adaptive Optics Systems III, 84474E (13 September 2012); doi: 10.1117/12.926820; https://doi.org/10.1117/12.926820

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