Speaker
Description
The reflector panel of large aperture submillimeter wave telescopes usually adopts the sub aperture splicing method, and its surface accuracy depends on the production accuracy of splicing a single sub aperture panel and the splicing accuracy of multiple sub apertures. This paper takes the main reflector of Xue-shan-mu-chang 15-meter Submillimeter Telescope（XSMT） as the research object, and uses a combination of simulation and experiment to conduct preliminary research on the design and manufacturing methods of the sub aperture of the reflector panel. Firstly, based on the Strehl ratio evaluation index, a quantitative analysis was conducted on the impact of Piston, Tip Tilt, Decenter, and manufacturing errors on the imaging performance of the system. An error sensitivity model was established, and the tolerance for each sub aperture stitching was given. We compared and studied the evolution law of the accuracy of the main reflector surface under different panel sizes, obtained optimized sub aperture segmentation sizes, and provided sub aperture segmentation strategies. Finally, a lightweight "aluminum honeycomb sandwich aluminum skin" composite structure reflective panel manufacturing method was proposed, which achieved high-precision surface shape through CNC milling, vacuum hot pressing, and multi wheel grinding and polishing process. A preliminary manufacturing process flow from blank forming to precision polishing was constructed. The thermal stability of the structure was verified through high-low temperature cycling tests on the samples, providing a feasible technical approach for the panel manufacturing of the XSMT.
