Measurement error for a Shack-Hartmann wavefront sensor in strong scintillation conditions

被引：5

作者：

Plett, ML ^{[1
]}

Barbier, PR ^{[1
]}

Rush, DW ^{[1
]}

Polak-Dingels, P ^{[1
]}

Levine, BM ^{[1
]}

机构：

[1] Univ Maryland, Phys Sci Lab, College Pk, MD 20740 USA

来源：

PROPAGATION AND IMAGING THROUGH THE ATMOSPHERE II | 1998年 / 3433卷

关键词：

Shack-Hartmann wavefront sensor; adaptive optics; atmospheric turbulence; optical wireless communication; near-ground propagation;

D O I：

10.1117/12.330219

中图分类号：

P4 [大气科学（气象学）];

学科分类号：

0706 ; 070601 ;

摘要：

Adaptive optics can be used to improve the performance of optical wireless communications links degraded by atmospheric turbulence. Accurate wavefront sensing is necessary for some adaptive optics systems to compensate for the effects of atmospheric turbulence. Although the Shack-Hartmann sensor can provide accurate wavefront sensing under controlled conditions, scintillation can restrict the performance of Shack-Hartmann wavefront sensing by creating large intensity fluctuations. These intensity fluctuations can create errors in the wavefront measurement if the intensity dynamic range of the Shack-Hartmann sensor is exceeded. The results of computer simulations which model the performance of the Shack-Hartmann wavefront sensor are presented. Specifically it is shown that the intensity dynamic range of the Shack-Hartmann wavefront sensor can be increased by operating with saturated pixels without an increase in error in the measured wavefront. Operating conditions that maximize the intensity dynamic range of the Shack-Hartmann sensor are presented. Experimental results are presented which support the results of the computer simulation.

引用

页码：211 / 220

页数：10