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

Mohammad N. Islam; Tim Robishaw; Bruce Veidt; Parmeet Brar; Xuan Du

doi:10.1117/12.3020829

11 September 2024 Finite element model verification of the John A. Galt 26-m telescope through photogrammetry

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

Author Affiliations +

Proceedings Volume 13094, Ground-based and Airborne Telescopes X; 130943G (2024) https://doi.org/10.1117/12.3020829
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Conference Poster

Abstract

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.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Mohammad N. Islam, Tim Robishaw, Bruce Veidt, Parmeet Brar, and Xuan Du "Finite element model verification of the John A. Galt 26-m telescope through photogrammetry", Proc. SPIE 13094, Ground-based and Airborne Telescopes X, 130943G (11 September 2024); https://doi.org/10.1117/12.3020829

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