Position Sensors And Actuators For Figure Control Of A Segmented Mirror Telescope

George Gabor

doi:10.1117/12.957065

3 May 1979 Position Sensors And Actuators For Figure Control Of A Segmented Mirror Telescope

George Gabor

Proceedings Volume 0172, Instrumentation in Astronomy III; (1979) https://doi.org/10.1117/12.957065
Event: Instrumentation in Astronomy, 1979, Tucson, United States

Abstract

A control system using mirror displacement sensors and position actuators to maintain proper surface control of a segmented mirror is summarized. The system is composed of three major components; a figure control computer, displacement sensors and displacement actuators. Desired positioning accuracy is 50 nm. Several methods for achieving the needed sensor sensitivity and stability are discussed. A capacitive hridge detector was chosen and its expected and measured behavior is described. Two mechanisms for positioning a mirror segment to optical tolerances, yet having a large dynamic range to compensate for mirror cell deformation are reviewed. Test results for a roller screw are given with an outline of the servo loop design.

Citation Download Citation

George Gabor "Position Sensors And Actuators For Figure Control Of A Segmented Mirror Telescope", Proc. SPIE 0172, Instrumentation in Astronomy III, (3 May 1979); https://doi.org/10.1117/12.957065

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available