FE model based interpretation of telescope temperature variations

摘要

At the IRAM 30m telescope on Pico Veleta, Spain, an extended net of temperature sensors has been installed in 1996 and their data recorded since. A finite element (FE) model of the antenna has been used to analyse these measurements and to refine the sensor network. Details on the optimum choice of sensor locations will be presented, and how their readings are interpolated onto the model grid. From the model, structural deformations are obtained and converted into observable telescope parameters. These parameters, like focus, pointing and large-scale surface deformations, will be used to upgrade the real-time instrumental performance and to provide the astronomer with data for an eventual correction of observations.