One-way visibility using two parallel aerosol clouds

Alyones, Sharhabeel; Bruce, Charles W.; Granado, Michael; Jelinek, A. V.

doi:10.1364/ao.54.000012

Cited by 6 publications

(7 citation statements)

References 4 publications

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“…The analysis of the asymmetry ratio A serves a dual purpose: it sheds light on the alterations in light propagation induced by the two plumes and quantifies the asymmetry of visibility. It is crucial to highlight that the asymmetry ratio of the IPBI two-cloud model (5) converges to the same metric studied by Alyones et al 1 in the appropriate limit. As such, the ABGJ model represents a specific limit case of our generalized IPBI model.…”

Section: Asymmetry Ratio Of the Ipbi Modelsupporting

confidence: 70%

“…where C o,R→L (C o,L→R) ) is the left (right) free contrast ratio. 1 Eq. ( 4) yields the definition of the asymmetry visibility ratio A of the IPBI two cloud system which is given by the following expression…”

Section: Asymmetry Ratio Of the Ipbi Modelmentioning

confidence: 99%

“…A significant step towards engineering the visibility differentials through aerosol clouds was achieved in the work of Alyones et al 1 In a clever experiment, these authors measured variations in visibility while observing opposing view directions through two consecutive aerosol clouds with distinct scattering and absorbing characteristics. A crucial ingredient in this experimental setup was the incorporation of a bright interferent over the most scattered cloud.…”

Section: Introductionmentioning

confidence: 99%

“…For instance, the authors consider that the transmissivity of each aerosol cloud is constant while fixing the location of the bright interferent. 1 In these proceedings, we report preliminary results on modeling the asymmetry imaging for two aerosol clouds, addressing the shortcomings of the ABGJ model. Our approach addresses the problem of imaging in the presence of a bright interferent (IPBI) whose location is arbitrary.…”

Section: Introductionmentioning

confidence: 99%

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Imaging asymmetry in the presence of a bright interferent

Martinez,

Stohn,

Gehm

2023

Unconventional Imaging, Sensing, and Adaptive Optics 2023

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Previously, Alyones et. al. (Appl Opt. 54 (2015)), showed that a pair of aerosol plumes — one purely scattering, the other purely absorbing—in the presence of a bright interferent, had the interesting property that the imaging contrast ratios through the pair of plumes were different in the two opposing directions. In this article, we generalize their earlier findings to plumes that have both absorption and scattering properties. In addition, by using the radiative transfer equation and its path integral solution, our method incorporates path length dependence, angular broadening due to multiple scattering, and arbitrary interferent location outside the zenith. We demonstrate that including these effects can significantly alter the asymmetry predicted by the model of Alyones et. al., and we provide estimates for the most optimal image contrast enhancements for different transport parameters.

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Section: Asymmetry Ratio Of the Ipbi Modelsupporting

confidence: 70%

Section: Asymmetry Ratio Of the Ipbi Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Imaging asymmetry in the presence of a bright interferent

Martinez,

Stohn,

Gehm

2023

Unconventional Imaging, Sensing, and Adaptive Optics 2023

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“…In this work, we apply a general methodology for reducing the scattering, as first introduced in [11] and inspired by the contrast concept as applied here to conductive objects: since in optical vision applications, the final goal for visibility is the contrast enhancement of harmonic scattered waves [12], a proper arXiv:1704.03323v2 [physics.class-ph] 13 Jun 2018 reduction of the contrast leads to zero and low harmonic scattered waves.…”

mentioning

confidence: 99%

Closed-form harmonic contrast control with surface impedance coatings for conductive objects

2017

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The problem of suppressing the scattering from conductive objects is addressed in terms of harmonic contrast reduction. A unique compact closed-form solution for a surface impedance Z s (m, kr) is found in a straightforward manner and without any approximation as a function of the harmonic index m (scattering mode to suppress) and of the frequency regime kr (product of wavenumber k and radius r of the cloaked system) at any frequency regime. In the quasi-static limit, mantle cloaking is obtained as a particular case for kr 1 and m = 0. In addition, beyond quasi-static regime, impedance coatings for a selected dominant harmonic wave can be designed with proper dispersive behaviour, resulting in improved reduction levels and harmonic filtering capability.

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Asymmetric imaging through engineered Janus particle obscurants using a Monte Carlo approach for highly asymmetric scattering media

da Mota,

Sadafi,

Mosallaei

2024

Sci Rep

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The advancement of imaging systems has significantly ameliorated various technologies, including Intelligence Surveillance Reconnaissance Systems and Guidance Systems, by enhancing target detection, recognition, identification, positioning, and tracking capabilities. These systems can be countered by deploying obscurants like smoke, dust, or fog to hinder visibility and communication. However, these counter-systems affect the visibility of both sides of the cloud. In this sense, this manuscript introduces a new concept of a smoke cloud composed of engineered Janus particles to conceal the target image on one side while providing clear vision from the other. The proposed method exploits the unique scattering properties of Janus particles, which selectively interact with photons from different directions to open up the possibility of asymmetric imaging. This approach employs a model that combines a genetic algorithm with Discrete Dipole Approximation to optimize the Janus particles' geometrical parameters for the desired scattering properties. Moreover, we propose a Monte Carlo-based approach to calculate the image formed as photons pass through the cloud, considering highly asymmetric particles, such as Janus particles. The effectiveness of the cloud in disguising a target is evaluated by calculating the Probability of Detection (PD) and the Probability of Identification (PID) based on the constructed image. The optimized Janus particles can produce a cloud where it is possible to identify a target more than 50% of the time from one side (PID > 50%) while the target is not detected more than 50% of the time from the other side (PD < 50%). The results demonstrate that the Janus particle-engineered smoke enables asymmetric imaging with simultaneous concealment from one side and clear visualization from the other. This research opens intriguing possibilities for modern obscurant design and imaging systems through highly asymmetric and inhomogeneous particles besides target detection and identification capabilities in challenging environments.

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One-way visibility using two parallel aerosol clouds

Cited by 6 publications

References 4 publications

Imaging asymmetry in the presence of a bright interferent

Imaging asymmetry in the presence of a bright interferent

Closed-form harmonic contrast control with surface impedance coatings for conductive objects

Asymmetric imaging through engineered Janus particle obscurants using a Monte Carlo approach for highly asymmetric scattering media

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