Year-long atmospheric characterization effort for laser weapon testing on the Potomac River Test Range at the Naval Surface Warfare Center Dahlgren Division

Bates, E. M.; Karlovich, John Z.; Filkoski, William L.

doi:10.1117/1.oe.61.7.076105

Cited by 4 publications

(4 citation statements)

References 25 publications

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“…The PRTR is a littoral test environment and has been previously characterized using various optical-turbulence measurements. 49…”

Section: Methodsmentioning

confidence: 99%

Branch-point detection using a Shack-Hartmann wavefront sensor

Kalensky,

Oesch,

Bukowski

et al. 2023

Unconventional Imaging, Sensing, and Adaptive Optics 2023

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In this paper, two methods for identifying branch points from Shack–Hartmann wavefront sensor (SHWFS) measurements were studied; the circulation of phase gradients approach and the beam-spread approach. These approaches were tested using a simple optical-vortex model, wave-optics simulations, and with experimental data. It was found that these two approaches are synergistic regarding their abilities to detect branch points. Specifically, the beam-spread approach works best when the branch point is located towards the center of the SHWFS’s lenslet pupil, while the circulation of phase gradients approach works best when the branch point is located towards the edge of the SHWFS’s lenslet pupil. These behavior were observed studying the simple optical-vortex model; however, they were further corroborated with the wave-optics and experimental results. The developments presented within support researchers looking to study high scintillation optical-turbulence environments as well as will inform efforts looking to develop branch-point tolerant reconstruction algorithms.

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“…The PRTR is a littoral test environment and has been previously characterized using various optical-turbulence measurements. 49…”

Section: Methodsmentioning

confidence: 99%

Branch-point detection using a Shack-Hartmann wavefront sensor

Kalensky,

Oesch,

Bukowski

et al. 2023

Unconventional Imaging, Sensing, and Adaptive Optics 2023

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show abstract

“…The experimental measurements in this work were collected over the Potomac River Test Range (PRTR) in Dahlgren, Virginia. The PRTR is a littoral test environment and has been previously characterized using various optical-turbulence measurements 50 , 51 . For the experiments conducted here, a λ=532 nm LED beacon was situated approximately Z=2.4 km away from the receive aperture as shown in Fig.…”

Section: Methodsmentioning

confidence: 99%

“…The PRTR is a littoral test environment and has been previously characterized using various optical-turbulence measurements. 50,51 For the experiments conducted here, a λ ¼ 532 nm LED beacon was situated approximately Z ¼ 2.4 km away from the receive aperture as shown in Fig. 3(b).…”

Section: Methodsmentioning

confidence: 99%

Comparison of branch-point detection approaches using a Shack–Hartmann wavefront sensor

Kalensky,

Oesch,

Bukowski

et al. 2023

Opt. Eng.

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Two methods for identifying branch points from Shack-Hartmann wavefront sensor (SHWFS) measurements were studied: the circulation of phase gradients approach and the beam-spread approach. These approaches were tested using a simple optical-vortex model, with wave-optics simulations, and with experimental data. It was found that these two approaches are synergistic regarding their abilities to detect branch points. Specifically, the beam-spread approach works best when the branch point is located toward the center of the SHWFS's lenslet pupil, whereas the circulation of phase gradients approach works best when the branch point is located toward the edge of the SHWFS's lenslet pupil. These behaviors were observed studying the simple optical-vortex model; however, they were further corroborated with the wave-optics and experimental results. The developments presented support researchers studying high scintillation optical-turbulence environments and inform efforts in developing branch-point tolerant reconstruction algorithms.

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“…Complementary experimental measurements were also collected over the Potomac River Test Range (PRTR) at the Naval Surface Warfare Center Dahlgren Division (NSWCDD) in Dahlgren, VA. A previous year-long characterization of this littoral test range was conducted and the results of which are presented in Ref. 4. In this paper, we utilize different approaches for estimating optical-turbulence strength not previously used in this test environment.…”

Section: Introductionmentioning

confidence: 99%

Optical-turbulence characterization of a littoral test environment using a Shack-Hartmann wavefront sensor

Bukowski,

O'Sullivan,

Kalensky

et al. 2023

Unconventional Imaging, Sensing, and Adaptive Optics 2023

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Beam propagation systems are often used in a wide range of atmospheric environments. Therefore, it is important to be able to characterize those environments in order to appropriately assess performance and inform design decisions. In this paper, a variety of methods for measuring atmospheric coherence length, r0, were analyzed including a Shack–Hartmann-based differential image motion monitor (DIMM), gradient-tilt variance, slope discrepancy variance, and phase variance methods, as well as using the modulation transfer function (MTF). These methods were tested on varying turbulence strength environments with known atmospheric coherence lengths, first using a single modified von Kármán phase screen, then using full wave-optics simulations with 20 phase screens. The Shack–Hartmann based approaches were shown to greatly increase in error for d/r0> 1 due to discrepancies between gradient tilt and the centroid tilt measured from the SHWFS’ image-plane irradiance patterns. An atmospheric data collection system was built and experimental results were taken for a beam propagating 2.4 km through a littoral environment over a 24 hour period.

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Year-long atmospheric characterization effort for laser weapon testing on the Potomac River Test Range at the Naval Surface Warfare Center Dahlgren Division

Cited by 4 publications

References 25 publications

Branch-point detection using a Shack-Hartmann wavefront sensor

Branch-point detection using a Shack-Hartmann wavefront sensor

Comparison of branch-point detection approaches using a Shack–Hartmann wavefront sensor

Optical-turbulence characterization of a littoral test environment using a Shack-Hartmann wavefront sensor

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