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- W2024704802 abstract "The Large Millimeter Telescope (LMT) is a 50m diameter millimetre-wave radio telescope situated on the summit ofSierra Negra, Puebla, at an altitude of 4600 meters. The reflector surface of the LMT currently employs84 segmentsarranged in three annular rings. Each segment is comprised of 8 precision composite subpanels located on five threadedadjusters. During the current primary surface refurbishment, individual segments are aligned in the telescope basementusing a laser tracker. This allows increased spatial resolution in shorter timescales, resulting in the opportunity forimproved logistics and increased alignment precision.To perform segment alignment an iterative process is carried out whereby the surface is measured and subpaneldeformations are corrected with the goal of 40 microns RMS. In practice we have been able to achieve RMS errors ofalmost 20 microns, with 35 microns typical. The number of iterations varies from around ten to over 20, dependingmainly on the behaviour of the mechanical adjusters that support the individual subpanels. Cross marks scribed on thereflector surface are used as fiducials, because their positions on the paraboloid are well known. Measurement data isprocessed using a robust curve fitting algorithm which provides a map of the surface showing the subpanel deviations. From this map the required subpanel adjuster movements are calculated allowing surface improvement in a stepwise manner." @default.
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- W2024704802 date "2013-05-13" @default.
- W2024704802 modified "2023-09-23" @default.
- W2024704802 title "Iterative alignment of reflector segments using a laser tracker" @default.
- W2024704802 doi "https://doi.org/10.1117/12.2020947" @default.
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