A soft actuator for Prototype Segmented Mirror Telescope

Prasanna Deshmukh, Padmakar Parihar, Deepta Sundar Mishra, Ajin Prakash, P. M.M. Kemkar

Research output: Chapter in Book/Report/Conference proceedingConference contribution

5 Citations (Scopus)

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.

Original languageEnglish
Title of host publicationAdvances in Optical and Mechanical Technologies for Telescopes and Instrumentation II
PublisherSPIE
Volume9912
ISBN (Electronic)9781510602038
DOIs
Publication statusPublished - 01-01-2016
Externally publishedYes
EventAdvances in Optical and Mechanical Technologies for Telescopes and Instrumentation II - Edinburgh, United Kingdom
Duration: 26-06-201601-07-2016

Conference

ConferenceAdvances in Optical and Mechanical Technologies for Telescopes and Instrumentation II
CountryUnited Kingdom
CityEdinburgh
Period26-06-1601-07-16

Fingerprint

Segmented Mirror
segmented mirrors
Telescopes
Telescope
Actuator
Mirrors
Actuators
actuators
prototypes
telescopes
Prototype
Mirror
mirrors
Active Control
Control System
active control
Control systems
Tip-tilt
Astrophysics
commands

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

Cite this

Deshmukh, P., Parihar, P., Mishra, D. S., Prakash, A., & Kemkar, P. M. M. (2016). A soft actuator for Prototype Segmented Mirror Telescope. In Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II (Vol. 9912). [991207] SPIE. https://doi.org/10.1117/12.2231172
Deshmukh, Prasanna ; Parihar, Padmakar ; Mishra, Deepta Sundar ; Prakash, Ajin ; Kemkar, P. M.M. / A soft actuator for Prototype Segmented Mirror Telescope. Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II. Vol. 9912 SPIE, 2016.
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Deshmukh, P, Parihar, P, Mishra, DS, Prakash, A & Kemkar, PMM 2016, A soft actuator for Prototype Segmented Mirror Telescope. in Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II. vol. 9912, 991207, SPIE, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II, Edinburgh, United Kingdom, 26-06-16. https://doi.org/10.1117/12.2231172

A soft actuator for Prototype Segmented Mirror Telescope. / Deshmukh, Prasanna; Parihar, Padmakar; Mishra, Deepta Sundar; Prakash, Ajin; Kemkar, P. M.M.

Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II. Vol. 9912 SPIE, 2016. 991207.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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Deshmukh P, Parihar P, Mishra DS, Prakash A, Kemkar PMM. A soft actuator for Prototype Segmented Mirror Telescope. In Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II. Vol. 9912. SPIE. 2016. 991207 https://doi.org/10.1117/12.2231172