Paper 13100-118
Paper 13100-118
Comparative Analysis Study of 43-point and 27-point Buyoff Stations for Stressed Mirror Polishing (SMP) Metrology
21 June 2024 • 13:50 - 14:05 Japan Standard Time | Room G214, North - 2F
Abstract
As a collaborative effort within the Thirty Meter Telescope (TMT) project, India is committed to supplying 84 polished segments for the primary mirror, employing the innovative Stressed Mirror Polishing (SMP) technology obtained from Coherent Inc., USA. SMP allows for the efficient polishing of highly aspheric non-axisymmetrical glass blanks at an accelerated rate. India-TMT (I-TMT) successfully applied SMP to qualify three glass roundels at Coherent's facility in Richmond, CA. The study focuses on a comparative analysis of Buyoff Stations (BOS) used in the SMP process. It contrasts results from the 43-point hydraulic-based BOS at Coherent with simulated outcomes from the 27-point whiffletree-based BOS at I-TMT. This analysis assesses efficacy and performance differences between the two BOS configurations, involving a comprehensive examination of a 1520mm diameter polished glass roundel. The study integrates Finite Element Method (FEM) simulations with experimental data, providing insights into the efficiency of the respective BOS setups.
Presenter
Indian Institute of Astrophysics (India)
Prasanna Deshmukh is currently working as an Engineer-C at Indian Institute of Astrophysics (IIA), Bangalore. He received his Ph.D. and M-Tech. degree in Astronomical Instrumentation from the IIA, Bangalore & the University of Calcutta in January 2021 & August 2013 respectively. He has completed his Ph.D. Thesis on the topic Modelling, Simulation, And Implementation of Primary Mirror Control System for the Prototype Segmented Mirror Telescope. He has worked on ‘Development of Precision controller for TMT Actuator’ at ITCC laboratory of IIA for his master’s thesis. He also has a Bachelor of Engineering degree in Electronics and Telecommunication from Shivaji University, Kolhapur. During Dec 2017 to May 2020, he was working as a Project Engineer at India - Thirty Meter Telescope Coordination Center at IIA, Bangalore. His interest lies in telescope control systems, active optics, control system modelling & simulations, astronomical instrumentation & astronomy outreach.