Title :
Performance of Centroiding Algorithms at Low Light Level Conditions in Adaptive Optics
Author :
Vyas, A. ; Roopashree, M.B. ; Prasad, B.R. ; Vyas, A.
Author_Institution :
Laser Lab., Indian Inst. of Astrophys. Bangalore, Bangalore, India
Abstract :
The performance metrics of different centroiding algorithms at low light level conditions were optimized in the case of a Shack Hartmann Sensor (SHS) for efficient performance of the adaptive optics system. For short exposures and low photon flux, the Hartmann spot does not have a Gaussian shape due to the photon noise which follows Poissonian statistics. The centroiding estimation error was calculated at different photon levels in the case of changing spot size and shift in the spot using Monte Carlo simulations. This analysis also proves to be helpful in optimizing the SHS specifications at low light levels.
Keywords :
Monte Carlo methods; adaptive optics; optical noise; stochastic processes; wavefront sensors; Gaussian shape; Monte Carlo simulation; Poissonian statistics; Shack Hartmann sensor; adaptive optics; centroiding algorithm; centroiding estimation error; photon flux; photon noise; Adaptive optics; Gaussian noise; Measurement; Noise shaping; Optical noise; Optical sensors; Optoelectronic and photonic sensors; Sensor systems; Shape; Statistics;
Conference_Titel :
Advances in Recent Technologies in Communication and Computing, 2009. ARTCom '09. International Conference on
Conference_Location :
Kottayam, Kerala
Print_ISBN :
978-1-4244-5104-3
Electronic_ISBN :
978-0-7695-3845-7
DOI :
10.1109/ARTCom.2009.30
