Colloquium on 10 November 2017
Primary Mirror Control System for Segmented mirror telescope.


Title: Primary Mirror Control System for Segmented mirror telescope.
Speaker: Prasanna Deshmukh (Indian Institute of Astrophysics, Bangalore)
Date: Friday, 10 November 2017
Time: 11:00 - 12:00
Venue: 1896 Building


New generation large telescopes are primarily made of segmented mirrors, and the design and implementation of such a telescope is a big challenge. As a first step towards realizing a bigger telescope in India, a project to develop a small Prototype Segmented Mirror Telescope (PSMT) has been initiated at Indian Institute of Astrophysics, Bangalore. The control of primary mirror made of a large number of small segments is one of the critical tasks, and telescope performance solely depends on it.  We have developed local and global control systems for the PSMT primary mirror. In the first phase, we designed and developed a precision soft actuator which is needed to align and phase all the mirror segments precisely. The actuator is also expected to reject any disturbances induced by the wind or structural vibration. The tests carried out in laboratory shows that the actuator developed for the PSMT telescope meets most of the design requirement and can be used in the real telescope. In the next phase, we have developed a global controller which is expected to maintain the shape of the primary mirror with the help of actuators and edge sensors. In addition to this, we have also developed a simulation tool named the codeSMT, which allow studying the overall performance of segmented mirror telescope based on the user inputs. Finally, we have developed an integrated system, comprising of local and global controllers for the PSMT and checked its functioning. In my presentation, I will discuss all these works linked with the primary mirror control of prototype segmented mirror telescope along with updates on different activities related TMT, NLOT and PSMT project.

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