1997
DOI: 10.1364/oe.1.000312
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Active Imaging through Cirrus Clouds

Abstract: The presence of clouds of ice particles in the uplink and downlink path of an illumination beam can severely impede the performance of an active imaging system. Depending on the optical depth of the cloud, i.e., its density and depth, the beam can be completely scattered and extinguished, or the beam can pass through the cloud with some fraction attenuated, scattered, and depolarized. In particular, subvisual cirrus clouds, i.e., high, thin cirrus clouds that cannot be observed from the ground, can affect the … Show more

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Cited by 5 publications
(2 citation statements)
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“…Traditional passive imaging methods often overcome the effects of atmospheric turbulence with complex adaptive optical systems. SBI is a active imaging technique, which can break through the aperture of the telescope to the limit of imaging resolution and enables high-resolution imaging of remote targets through atmospheric turbulence [2][3][4][5][6][7][8][9][10][11][12][13][14] . SBI system illuminates a target using three laser beams with slightly different frequencies arranged as an "L" in the emission plane, and receives echo signal by a detector array for computational imaging [4] .…”
Section: Introductionmentioning
confidence: 99%
“…Traditional passive imaging methods often overcome the effects of atmospheric turbulence with complex adaptive optical systems. SBI is a active imaging technique, which can break through the aperture of the telescope to the limit of imaging resolution and enables high-resolution imaging of remote targets through atmospheric turbulence [2][3][4][5][6][7][8][9][10][11][12][13][14] . SBI system illuminates a target using three laser beams with slightly different frequencies arranged as an "L" in the emission plane, and receives echo signal by a detector array for computational imaging [4] .…”
Section: Introductionmentioning
confidence: 99%
“…There are generally three types of unconventional ground-based imaging techniques for space targets: Fourier telescopy, 1 intensity correlation imaging, 2 and sheared-beam imaging (SBI; also called sheared coherent interferometric photography), 3 5 which are high-resolution computational imaging techniques 6 that use laser illumination and do not need an optical imaging system. One of these, SBI technology, has the advantage of quasi-real-time imaging, which is particularly suited to the observation of fast-moving targets in long-distance through atmospheric turbulence.…”
Section: Introductionmentioning
confidence: 99%