A kind of FPGA-based correlating Shack-Hartmann wave-front processor

Xiaofeng Peng; Mei Li; Changhui Rao

doi:10.1117/12.819702

31 December 2008 A kind of FPGA-based correlating Shack-Hartmann wave-front processor

Xiaofeng Peng, Mei Li, Changhui Rao

Proceedings Volume 7130, Fourth International Symposium on Precision Mechanical Measurements; 71303Z (2008) https://doi.org/10.1117/12.819702
Event: Fourth International Symposium on Precision Mechanical Measurements, 2008, Anhui, China

Abstract

In solar adaptive optical system, absolute difference algorithm and correlation coefficients algorithm are widely used in Shack-Hartmann wave-front detection of the extended object. A Shack-Hartmann wave-front processor based on absolute difference algorithm is described in this paper. It is characterized by parallel and systolic architecture. The peak operation speed is over 23,000,000,000/s and calculation latency is 120us in a system with 6x6 sub-aperture array, which is 32x32 pixel in size each and for which the reference image is 16x16 pixel. Using this processor, frame rate of the CCD (Charge Coupled Device) can be up to 1000 Hz, and with smaller sub-aperture size, the frame rate can be even higher. Built in a single FPGA (Field Programmable Gate Array), it is low-cost, compact and easy to be modified.

Citation Download Citation

Xiaofeng Peng, Mei Li, and Changhui Rao "A kind of FPGA-based correlating Shack-Hartmann wave-front processor", Proc. SPIE 7130, Fourth International Symposium on Precision Mechanical Measurements, 71303Z (31 December 2008); https://doi.org/10.1117/12.819702

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