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Dispersed fringe sensor for the Giant Magellan Telescope
2016
Applied Optics
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The Giant Magellan Telescope (GMT) consists of seven 8.365 m segments, with gaps of 0.345 m between adjacent segments. A unique challenge for GMT lies in phasing the segments and, in particular, how to measure segment piston optically while the telescope is in science operation. In this paper, we present a dispersed fringe sensor (DFS) to make these measurements using a novel algorithm. We show that using four off-axis DFSs operating at J-band with 10 ms exposures, we are able to measure
doi:10.1364/ao.55.000539
pmid:26835929
fatcat:xdgqcge52nglrlmp4wbducvopy