Impact of Exposure Time on Optical-phase Measurements
Document Type
Article
Publication Date
8-1-2024
Abstract
In this paper, we explore the impact of exposure time on optical-phase measurements collected on light that has propagated through atmospheric-optical turbulence. We model the exposure time by phase averaging over a convective distance, and we quantify the associated impact of imposing an exposure time using the piston- and tilt-removed phase variance. We accomplish this analysis through the development of an analytic solution and wave-optics simulations. In turn, we show that the analytic solution and simulation results are in good agreement when Uc��/D≲0.25, where Uc is the convective velocity, �� is the exposure time, and D is the aperture diameter. When Uc��/D≳0.25, the analytic solution underestimates the piston- and tilt-removed phase variance relative to the simulation results, and we discuss these differences. This work, at large, informs wavefront sensing and adaptive-optics efforts, where either the wind speed is high, the system is on a high-speed platform, the beacon is on a high-speed platform, or the beacon signal is very faint thereby requiring long-exposure data collections.
Source Publication
Journal of the Optical Society of America A
Recommended Citation
Matthew Kalensky, Milo W. Hyde, Darren Getts, and Mark F. Spencer, "Impact of exposure time on optical-phase measurements in turbulence," J. Opt. Soc. Am. A 41, 1441-1451 (2024)
Comments
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