Abstract Details
| Name: Prasanna Deshmukh Affiliation: Indian Institute of Astrophysics Conference ID: ASI2016_428 Title : Simulator for Primary Mirror Control System of Segmented Mirror Telescope Authors and Co-Authors : Prasanna Deshmukh, Padmakar Parihar Abstract Type : Oral Abstract Category : Instrumentation and Techniques Abstract : Segmented mirror technology is slowly becoming a natural choice for new generation telescopes of mid to large sizes. The challenge with the segmented primary mirror telescope (SMT) is to maintain the alignment of mirror segments against gravity, thermal and wind induced disturbances. In order to accomplish this, each mirror segment is actively controlled using three actuators per segment and two edge sensors along each inter-segment gap. The conversion of sensor positions to required displacement in actuator space is carried out by using primary mirror control system (M1CS), which utilizes an interaction control matrix. As telescope size increases, control of segmented mirror telescope becomes more and more challenging due to its complexity and presence of high order system. Another factor which needs to be carefully studied is the effect of sensor/actuator noise. In the M1CS control, propagation of uncorrelated sensor noise gets reflected as different modes (surface distortion) in the primary mirror. We have developed a generic M1CS simulator for SMT using Matlab & Simulink. Our simulator, can handle, variable sizes of mirror segments and number of segment rings, different geometrical configurations of edge sensor and actuators, different noises sources, disturbances etc. Simulator generates a C code which can directly be implemented in M1CS processor. We have also developed a tool which interfaces simulator to ZEMAX for further optical analysis and performance evaluations. In this paper we will present different aspects of the M1CS Simulator for SMT along with its application to the Prototype Segmented Mirror Telescope (PSMT) which is a seven segment test bed telescope under design and development at Indian Institute of Astrophysics. |