Wavefront Sensing, Active and Adaptive Optics, and Control Systems

Dynamic analysis and control of mirror segment actuators for the European Extremely Large Telescope

[+] Author Affiliations
Gert Witvoet

TNO Technical Sciences, Opto-Mechatronics Department, Stieltjesweg 1, 2628 CK Delft, The Netherlands

Remco den Breeje

TNO Technical Sciences, Opto-Mechatronics Department, Stieltjesweg 1, 2628 CK Delft, The Netherlands

Jan Nijenhuis

TNO Technical Sciences, Opto-Mechatronics Department, Stieltjesweg 1, 2628 CK Delft, The Netherlands

René Hazelebach

TNO Technical Sciences, Opto-Mechatronics Department, Stieltjesweg 1, 2628 CK Delft, The Netherlands

Niek Doelman

TNO Technical Sciences, Opto-Mechatronics Department, Stieltjesweg 1, 2628 CK Delft, The Netherlands

J. Astron. Telesc. Instrum. Syst. 1(1), 019003 (Jan 28, 2015). doi:10.1117/1.JATIS.1.1.019003
History: Received August 22, 2014; Accepted December 16, 2014
Text Size: A A A

Abstract.  Segmented primary mirror telescopes require dedicated piston-tip-tilt actuators for optimal optical performance. Netherlands Organisation for Applied Scientific Research (TNO) has developed various prototypes of such actuators, in particular for the E-ELT. This paper presents the dynamics analysis and feedback control results for a specific two-stage prototype. First, the dynamics of the actuator in interconnection with the to-be-positioned mass has been analyzed, both using frequency response measurements and first principles modeling, resulting in a detailed understanding of the dynamic behavior of the system. Next, feedback controllers for both the fine and the coarse stage have been designed and implemented. Finally, the feedback-controlled actuator has been subjected to a realistic tracking experiment; the achieved results have demonstrated that the TNO actuator is able to suppress wind force disturbances and ground vibrations with more than a factor 103, down to 1.4 nm root mean square, which is compliant with the requirements.

© 2015 Society of Photo-Optical Instrumentation Engineers

Citation

Gert Witvoet ; Remco den Breeje ; Jan Nijenhuis ; René Hazelebach and Niek Doelman
"Dynamic analysis and control of mirror segment actuators for the European Extremely Large Telescope", J. Astron. Telesc. Instrum. Syst. 1(1), 019003 (Jan 28, 2015). ; http://dx.doi.org/10.1117/1.JATIS.1.1.019003


Tables

Access This Article
Sign in or Create a personal account to Buy this article ($20 for members, $25 for non-members).

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging & repositioning the boxes below.

Related Journal Articles

Related Book Chapters

Topic Collections

Advertisement
  • Don't have an account?
  • Subscribe to the SPIE Digital Library
  • Create a FREE account to sign up for Digital Library content alerts and gain access to institutional subscriptions remotely.
Access This Article
Sign in or Create a personal account to Buy this article ($20 for members, $25 for non-members).
Access This Proceeding
Sign in or Create a personal account to Buy this article ($15 for members, $18 for non-members).
Access This Chapter

Access to SPIE eBooks is limited to subscribing institutions and is not available as part of a personal subscription. Print or electronic versions of individual SPIE books may be purchased via SPIE.org.