Testing FPGAs for real-time control of adaptive optics in giant telescopes

Luis F. Rodríguez-Ramos; Teodora Viera; Guillermo Herrera; José V. Gigante; Fernando Gago; Ángel Alonso

doi:10.1117/12.669960

27 June 2006 Testing FPGAs for real-time control of adaptive optics in giant telescopes

Luis F. Rodríguez-Ramos, Teodora Viera, Guillermo Herrera, José V. Gigante, Fernando Gago, Ángel Alonso

Proceedings Volume 6272, Advances in Adaptive Optics II; 62723X (2006) https://doi.org/10.1117/12.669960
Event: SPIE Astronomical Telescopes + Instrumentation, 2006, Orlando, Florida , United States

Abstract

Real-time control has been clearly identified as a separate challenging field within Adaptive Optics, where a lot of computations have to be performed at kilohertz rate to properly actuate the mirror(s) before the input wavefront information has become obsolete. When considering giant telescopes, the number of guide stars, wavefront samples and actuators rises to a level where the amount of processing is far from being manageable by today's conventional processors and even from the expectations given by Moore's law for the next years. FPGA (Field Programmable Gate Arrays) technology has been proposed to overcome this problem by using its massively parallel nature and its superb speed. A complete laboratory test bench using only one FPGA was developed by our group [1], and now this paper summarizes the early results of a real telescope adaptive optics system based in the FPGA-only approach. The system has been installed in the OGS telescope at "Observatorio del Teide", Tenerife, Spain, showing that a complete system with 64 Shack-Hartmann microlenses and 37 actuators (plus tip-tilt mirror) can be implemented with a real time control completely contained within a Xilinx Virtex-4 LX25 FPGA. The wavefront sensor has been implemented using a PULNIX gigabit ethernet camera (714 frames per second), and an ANDOR IXON camera has been used for the evaluation of the overall correcting behavior.

Citation Download Citation

Luis F. Rodríguez-Ramos, Teodora Viera, Guillermo Herrera, José V. Gigante, Fernando Gago, and Ángel Alonso "Testing FPGAs for real-time control of adaptive optics in giant telescopes", Proc. SPIE 6272, Advances in Adaptive Optics II, 62723X (27 June 2006); https://doi.org/10.1117/12.669960

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