Dr. Xuan Du Profile

Dr. Xuan Du

at National Research Council of Canada

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Proceedings Article | 11 September 2024 Poster + Paper

Finite element model verification of the John A. Galt 26-m telescope through photogrammetry

Mohammad Islam, Tim Robishaw, Bruce Veidt, Parmeet Brar, Xuan Du

Proceedings Volume 13094, 130943G (2024) https://doi.org/10.1117/12.3020829

KEYWORDS: Telescopes, Photogrammetry, Deformation, Reflectors, Radio telescopes, Modeling, Astronomy, Polarization

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The John A. Galt 26m radio telescope is an important astronomical instrument for the Canadian radio astronomy community. The prime focus telescope is ideal for spectropolarimetric studies of the interstellar medium. Nonetheless, under various gravity loading conditions, the structural deformation in the telescope causes unpolarized radiation into a polarized signal which corrupt the astronomical signal. In addition to that, due to the equatorial mount arrangement, the tripod-shaped feed support structure also changes its position depending on the pointing direction. This variation also affects the reflective surface and the feed position relative to the reflective surface. A detailed finite element (FE) model of the antenna has been created to characterize the effects and related deformation of the structure. Gravity related surface and support structure deformation was studied. As a part of the FE model verification, a photogrammetry-based antenna metrology was conducted. The surface RMS errors are between 3 - 4 mm when compared with a best-fit paraboloid. In addition to the error characterization, the photogrammetry setup and challenges are also discussed in this article.

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