Bibcode
Fuensalida, J. J.; Alonso, A.; Dorta, T.; Chulani, H.; Martín, Y.; Rodríguez-Ramos, L. F.
Referencia bibliográfica
Adaptive Optics Systems III. Proceedings of the SPIE, Volume 8447, id. 84472R-84472R-9 (2012).
Fecha de publicación:
7
2012
Número de citas
3
Número de citas referidas
2
Descripción
EDIFISE is a technology demonstrator instrument developed at the
Institute of Astrophysics of the Canary Islands (IAC), intended to
explore the feasibility of combining Adaptive Optics with attenuated
optical fibers in order to obtain high spatial resolution spectra at the
surroundings of a star, as an alternative to coronagraphy. A simplified
version with only tip tilt correction has been tested at the OGS
telescope in Observatorio del Teide (Canary islands, Spain) and a
complete version is intended to be tested at the OGS and at the WHT
telescope in Observatorio del Roque de los Muchachos, (Canary Islands,
Spain). This paper describes the FPGA-based real time control of the
High Order unit, responsible of the computation of the actuation values
of a 97-actuactor deformable mirror (11x11) with the information
provided by a configurable wavefront sensor of up to 16x16 subpupils at
500 Hz (128x128 pixels). The reconfigurable logic hardware will allow
both zonal and modal control approaches, will full access to select
which mode loops should be closed and with a number of utilities for
influence matrix and open loop response measurements. The system has
been designed in a modular way to allow for easy upgrade to faster frame
rates (1500 Hz) and bigger wavefront sensors (240x240 pixels), accepting
also several interfaces from the WFS and towards the mirror driver. The
FPGA-based (Field Programmable Gate Array) real time controller provides
bias and flat-fielding corrections, subpupil slopes to modal matrix
computation for up to 97 modes, independent servo loop controllers for
each mode with user control for independent loop opening or closing,
mode to actuator matrix computation and non-common path aberration
correction capability. It also provides full housekeeping control via
UPD/IP for matrix reloading and full system data logging.