The Possibility of Determining Optical Properties of Water from the Image of the Underwater Solar Path

Molkov, A.A.; Долин, Л. С.

doi:10.1007/s11141-016-9630-9

Cited by 3 publications

(1 citation statement)

References 6 publications

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“…A rapid increasing attention has been paid to the marine development and there is an an urgent need for underwater high-resolution imaging technology [1][2][3][4][5][6]. At present, there are mainly two methods for underwater imaging [7].…”

Section: Introductionmentioning

confidence: 99%

Range Intensity Profiles of Multi-Slice Integration for Pulsed Laser Range-Gated Imaging System

Lin

Han

et al. 2022

Photonics

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Pulsed laser range-gated imaging (PLRGI) is one of the most effective methods to achieve underwater high-resolution imaging. When searching target, there are two methods can be used: fixed gate and sliding gate. In practice, fixed gate has a small depth of field of view and sliding gate cannot meet the need of real time. In order to overcome these problems, multi-slice integration (MSI) method is proposed in this paper. First, the laser energy received by the PLRGI system is derived from radiative transfer theory. In addition, range intensity profiles (RIP) of MSI method is established. Experiments are carried out in lab to validate the RIP model and results show that theoretical data and experimental data are in good coincidence. Then the gate width and the number of pulse assigned to each slice are discussed. Finally, to prove the effectiveness of the MSI method, experiments are carried out in a boat tank. Results show that the MSI method is better than the fixed gate method for surveillance, and can acquire a clear image of the target at 18 m (4.5 times of the attenuation length) in the water with attenuation coefficient of 0.25 m−1.

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Section: Introductionmentioning

confidence: 99%

Range Intensity Profiles of Multi-Slice Integration for Pulsed Laser Range-Gated Imaging System

Lin

Han

et al. 2022

Photonics

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A Possibility of Determining the Optical Peoperties of Water from the Snell-Window Image

Долин

Molkov

2017

Radiophys Quantum El

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Manifestation of surfactant films in underwater solar path images: numerical experiment

Molkov

2021

Appl. Opt.

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This paper continues a series of studies on using underwater solar path imagery (USPI) to retrieve characteristics of wind-driven waves and their variations in the field of near-surface hydrophysical processes under the influence of surfactant films. Research is based on previously developed mathematical models of USPI and its statistical moments, the Elfouhaily spectrum of wind-driven waves, the Ermakov model of wave damping by a thin film, and the Cox-Munk result for a thick oil film. A high sensitivity of two statistical moments of USPI to variations of wind–wave conditions and viscoelastic characteristics of oil films was shown. The presented examples demonstrated 20%–40% narrowing of the statistically average image (the first statistical moment) for thin films and more than 2 times narrowing for thick films. The film presence also leads to significant changes in the autocorrelation function of USPI. The characteristic scales and magnitudes of changes in the considered statistical moments fit into the ranges of values that can be recorded in practice using even inexpensive video cameras. At the same time, there are cases in which these moments are close, for example, for a clean sea surface in weak winds and for a surface covered by a thin film in stronger winds. These cases can be distinguished by analyzing a series of instant images. As an example, a series of real underwater images demonstrating changes in the glint structure with the surfactant film spot passing through the observed sea surface area were analyzed. This example is intended to help researchers to distinguish cases of wind weakening and a surfactant film presence.

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The Possibility of Determining Optical Properties of Water from the Image of the Underwater Solar Path

Cited by 3 publications

References 6 publications

Range Intensity Profiles of Multi-Slice Integration for Pulsed Laser Range-Gated Imaging System

Range Intensity Profiles of Multi-Slice Integration for Pulsed Laser Range-Gated Imaging System

A Possibility of Determining the Optical Peoperties of Water from the Snell-Window Image

Manifestation of surfactant films in underwater solar path images: numerical experiment

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