Photon counting versus CCD sensors for wavefront sensing: performance comparison in the presence of noise

Andreas Glindemann; Nicholas P. Rees

doi:10.1117/12.176254

1 June 1994 Photon counting versus CCD sensors for wavefront sensing: performance comparison in the presence of noise

Proceedings Volume 2199, Advanced Technology Optical Telescopes V; (1994) https://doi.org/10.1117/12.176254
Event: 1994 Symposium on Astronomical Telescopes and Instrumentation for the 21st Century, 1994, Kailua, Kona, HI, United States

Abstract

Using simulations of time evolving speckle patterns we investigate the performance of three different wavefront sensors--a Shack-Hartmann sensor, a curvature sensor and an intensity moments based sensor. We compare the performance of these systems using detectors with two different levels of read noise--0 electronics read noise, corresponding to a photon counting detector and 5 electrons read noise, corresponding to a CCD. We also look at the effect of different source photon rates. For the UKIRT Upgrades program we will address the question which of the three wavefront sensors is optimal. We will also present a new simulation method for time-evolving speckle patterns using two turbulent layers.

Citation Download Citation

Andreas Glindemann and Nicholas P. Rees "Photon counting versus CCD sensors for wavefront sensing: performance comparison in the presence of noise", Proc. SPIE 2199, Advanced Technology Optical Telescopes V, (1 June 1994); https://doi.org/10.1117/12.176254

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