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Proceedings Paper

A soft actuator for Prototype Segmented Mirror Telescope
Author(s): Prasanna Deshmukh; Padmakar Parihar; Deepta Sundar Mishra; Ajin Prakash; P. M. M. Kemkar
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Paper Abstract

The Segmented Mirror Telescopes (SMT) are built using small hexagonal mirror segments placed side by side to form a monolithic primary mirror of very large size. The effective figure of such a segmented primary mirror is maintained against external disturbances introduced by gravity, temperature, wind and vibration with the help of primary mirror active control system. This active control system consists of two levels of control – global and local level. At the global scale, three actuators per segment and two edge sensors per intersegment sides are used to maintain the shape of the primary mirror. At the local level, actuator control system executes the commands generated by the global control loop. Every mirror segment is controlled with the help of three actuators, where the major role of these actuators is to provide a tip, tilt, and piston to the mirror segments. In this paper, we describe the actuator developed for 1.5m diameter Prototype Segmented Mirror Telescope (PSMT). The actuator for this telescope is a soft actuator based on the voice coil mechanism. This actuator is designed for with the range of travel of ±1.5mm and the force range of 25N along with an offloading capability to reduce the power consumption. The prototype actuator is undergoing different tests at Indian Institute of Astrophysics (IIA), Bangalore. The tracking rate of 324nm/s is achieved with the tracking error of 22.5 nm RMS.

Paper Details

Date Published: 22 July 2016
PDF: 15 pages
Proc. SPIE 9912, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II, 991207 (22 July 2016); doi: 10.1117/12.2231172
Show Author Affiliations
Prasanna Deshmukh, Indian Institute of Astrophysics (India)
Padmakar Parihar, Indian Institute of Astrophysics (India)
Deepta Sundar Mishra, Manipal Institute of Technology (India)
Ajin Prakash, Indian Institute of Astrophysics (India)
P. M. M. Kemkar, Indian Institute of Astrophysics (India)


Published in SPIE Proceedings Vol. 9912:
Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II
Ramón Navarro; James H. Burge, Editor(s)

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