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Detector integration time dependent atmospheric turbulence imaging simulation

: Du Bosq, Todd W.; Repasi, Endre


Holst, G.C. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Infrared imaging systems: Design, analysis, modeling, and testing XXVI : 21 - 23 April 2015, Baltimore, Maryland, United States
Bellingham, WA: SPIE, 2015 (Proceedings of SPIE 9452)
ISBN: 978-1-62841-568-1
Paper 94520B
Conference" Infrared Imaging Systems - Design, Analysis, Modeling, and Testing" <26, 2015, Baltimore/Md.>
Fraunhofer IOSB ()
INT; imaging simulation; atmospheric turbulence; integration time

Atmospheric turbulence is a well-known phenomenon that often degrades image quality due to intensity fluctuations, distortion, and blur in electro-optic and thermal imaging systems. To properly assess the performance of an imaging system over the typical turbulence trade space, a time consuming and costly field study is often required. A fast and realistic turbulence simulation will allow the performance assessment of an imaging system under various turbulence conditions to be done as well as provide input data for the evaluation of turbulence mitigation algorithms in a cost efficient manner. The simulation is based on an empirical model with parameters derived from the first and second-order statistics of imaging distortions measured from field collected data. The dataset consists of image sequences recorded with a variable frame rate visible camera from strong to weak turbulence conditions. The simulation uses pristine, single images containing no turbulence effects as an input and produces image sequences degraded by the specified turbulence. Target range, optics diameter, wavelength, detector integration time, and the wind velocity component perpendicular to the propagation path all contribute to the severity of the atmospheric turbulence distortions and are included in the simulation. The addition of the detector integration time expands the functionality of the simulation tool to include imagers with lower frames rates. Examples are presented demonstrating the utility of the turbulence simulation.