Anisoplanatic atmospheric measurements for terrestrial imaging

Clare E. Dillon; Heather Dalgarno; Sijiong Zhang; Alan H. Greenaway

doi:10.1117/12.669361

Anisoplanatic atmospheric measurements for terrestrial imaging

Clare E. Dillon, Heather Dalgarno, Sijiong Zhang, Alan H. Greenaway

School of Engineering & Physical Sciences

Research output: Contribution to journal › Article › peer-review

Abstract

Phase diversity measurements using diffractive encoding systems offer a means for simultaneous measurement of the angular dependence of the turbulence induced in the wavefront distortion and either the angular dependence of scintillation induced during atmospheric propagation or the turbulence-degraded point spread function. We will describe experiments designed to measure the wavefront distortion and angular decorrelation of the atmospheric transfer functions, and discuss the observational strategy for measurement of atmospheric properties under a range of atmospheric conditions and propagation distances. By reconstructing the laser wavefront and comparing the calculated and measured images we will also aim to investigate the effect of strong scintillation on phase diversity wavefront reconstruction techniques. Laboratory tests of the equipment and preliminary measurements will be described, as well as some theory and modeling.

Original language	English
Article number	60180W
Journal	Proceedings of SPIE - the International Society for Optical Engineering
Volume	6018
DOIs	https://doi.org/10.1117/12.669361
Publication status	Published - 2005
Event	5th International Workshop on Adaptive Optics for Industry and Medicine - Beijing, China Duration: 29 Aug 2005 → 1 Sep 2005

Keywords

Anisoplanatism
Atmospheric propagation
Scintillation
Wavefront sensing

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10.1117/12.669361

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T1 - Anisoplanatic atmospheric measurements for terrestrial imaging

AU - Dillon, Clare E.

AU - Dalgarno, Heather

AU - Zhang, Sijiong

AU - Greenaway, Alan H.

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AB - Phase diversity measurements using diffractive encoding systems offer a means for simultaneous measurement of the angular dependence of the turbulence induced in the wavefront distortion and either the angular dependence of scintillation induced during atmospheric propagation or the turbulence-degraded point spread function. We will describe experiments designed to measure the wavefront distortion and angular decorrelation of the atmospheric transfer functions, and discuss the observational strategy for measurement of atmospheric properties under a range of atmospheric conditions and propagation distances. By reconstructing the laser wavefront and comparing the calculated and measured images we will also aim to investigate the effect of strong scintillation on phase diversity wavefront reconstruction techniques. Laboratory tests of the equipment and preliminary measurements will be described, as well as some theory and modeling.

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KW - Atmospheric propagation

KW - Scintillation

KW - Wavefront sensing

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