AO Group Annual Report

Olivier, S

Lawrence Livermore National Laboratory

关键词: Proliferation;    98 Nuclear Disarmament, Safeguards, And Physical Protection;    Remote Sensing;    Diffraction;    Turbulence;   

DOI  :  10.2172/889452
RP-ID  :  UCRL-TR-217011
RP-ID  :  W-7405-ENG-48
RP-ID  :  889452

美国|英语

来源: UNT Digital Library

【 摘 要 】

The Adaptive Optics (AO) Group in I Division develops and tests a broad range of advanced wavefront control technologies. Current applications focus on: Remote sensing, High power lasers, Astronomy, and Human vision. In the area of remote sensing, the AO Group leads a collaborative effort with LLNL's Nonproliferation, Arms Control & International Security (NAI) Directorate on Enhanced Surveillance Imaging. The ability to detect and identify individual people or vehicles from long-range is an important requirement for proliferation detection and homeland security. High-resolution imaging along horizontal paths through the atmosphere is limited by turbulence, which blurs and distorts the image. For ranges over {approx}one km, visible image resolution can be reduced by over an order of magnitude. We have developed an approach based on speckle imaging that can correct the turbulence-induced blurring and provide high resolution imagery. The system records a series of short exposure images which freeze the atmospheric effects. We can then estimate the image magnitude and phase using a bispectral estimation algorithm which cancels the atmospheric effects while maintaining object information at the diffraction limit of the imaging system.