Phasing of segmented mirrors: new algorithm and numerical results for piston detection

Jose M. Rodriguez-Ramos; Jesus Jimenez Fuensalida

doi:10.1117/12.391516

20 July 2000 Phasing of segmented mirrors: new algorithm and numerical results for piston detection

Jose M. Rodriguez-Ramos, Jesus Jimenez Fuensalida

Proceedings Volume 4003, Optical Design, Materials, Fabrication, and Maintenance; (2000) https://doi.org/10.1117/12.391516
Event: Astronomical Telescopes and Instrumentation, 2000, Munich, Germany

Abstract

The PSF of a segmented mirror telescope is hardly affected by the segments alignment and it can cancel the performances of the Adaptive Optics Systems. The piston and tilt of each segment must be uniformly adjusted in relation to the rest of the segments. Furthermore, the direct detection of the alignment error with natural stars would be desirable in order to monitor the errors during the astronomical observation. We have studied the lost information of the piston error by the presence of atmospheric turbulence in the measurements of curvature and present a new algorithm to obtain the local piston using the curvature sensor. A phase wrapping effect is shown as responsible for the loss of curvature information to get the piston error map well enough; this happens not only in the presence of atmospheric turbulence, but also without it.

Citation Download Citation

Jose M. Rodriguez-Ramos and Jesus Jimenez Fuensalida "Phasing of segmented mirrors: new algorithm and numerical results for piston detection", Proc. SPIE 4003, Optical Design, Materials, Fabrication, and Maintenance, (20 July 2000); https://doi.org/10.1117/12.391516

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