An innovative artificial fog production device improved in the European project “FOG”

Colomb, Michèle; Hirech, Kamal; André, Philippe; Boreux, Jj; Lacôte, P.; Dufour, J.

doi:10.1016/j.atmosres.2007.11.021

Cited by 61 publications

(71 citation statements)

References 9 publications

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“…The fog chamber of Clermont-Ferrand [26] is 30 meters long, 5.5 m wide and 2.7 m high and consists of a smallscale climatic chamber in which we can sprinkle water droplets until the air is saturated with fog. The evolution of density of the fog is permanently monitored by a TR30 transmissometers from Degreane Horizon with a base of 28 m. Granulometric distributions were measured with a Palas sensor.…”

Section: Artificial Fog Chambermentioning

confidence: 99%

Static Estimation of the Meteorological Visibility Distance in Night Fog with Imagery

Gallen¹,

Hautiére²,

Dumont³

2010

IEICE Trans. Inf. & Syst.

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SUMMARYIn this article, we propose a new way to estimate fog extinction at night with a camera. We also propose a method for the classification of fog depending on the forward scattering. We show that a characterization of fog based on the atmospheric extinction parameter only is not sufficient, specifically in the perspective of adaptive lighting for road safety. This method has been validated on synthetic images generated with a semi Monte-Carlo ray tracing software dedicated to fog simulation as well as with experiments in a fog chamber, we present the results and discuss the method, its potential applications and its limits.

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Section: Artificial Fog Chambermentioning

confidence: 99%

Static Estimation of the Meteorological Visibility Distance in Night Fog with Imagery

Gallen¹,

Hautiére²,

Dumont³

2010

IEICE Trans. Inf. & Syst.

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“…Several studies focus on light propagation through obscurants and its effect on automobile safety, optical communication, and the modulation transfer function of optical systems. [1][2][3][4][5][6] Other studies have examined the effect of wavelength on light penetration through dispersive media. [7][8][9] Simulations have been utilized to examine foundational aspects of photon propagation through scattering media, [10][11][12][13][14] but these studies often assume model parameters such as monodispersed droplet size and homogeneous atmospheric conditions.…”

Section: Introductionmentioning

confidence: 99%

“…This chamber is primarily used for testing automotive lights and street sign visibility in fog. 2 Other smaller fog chambers have been created, including the electro-optical test facility fog chamber 21 and the VALEO Bobigny fog chamber. 17 Along with these fog generation facilities, there are chambers designed for the production of clouds.…”

Section: Introductionmentioning

confidence: 99%

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Image quality, meteorological optical range, and fog particulate number evaluation using the Sandia National Laboratories fog chamber

et al. 2017

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Abstract. The evaluation of optical system performance in fog conditions typically requires field testing. This can be challenging due to the unpredictable nature of fog generation and the temporal and spatial nonuniformity of the phenomenon itself. We describe the Sandia National Laboratories fog chamber, a new test facility that enables the repeatable generation of fog within a 55 m × 3 m × 3 m (L × W × H) environment, and demonstrate the fog chamber through a series of optical tests. These tests are performed to evaluate system image quality, determine meteorological optical range (MOR), and measure the number of particles in the atmosphere. Relationships between typical optical quality metrics, MOR values, and total number of fog particles are described using the data obtained from the fog chamber and repeated over a series of three tests. © The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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“…As the occurrence of fog in northern India and around the world have become more frequent in recent times, it is necessary to have detailed information about the optical nature of fog particulate system (water droplet + fog condensation nuclei), leading to poor visibility. Atmospheric fog is typically composed of sub-micron size inactivated particles associated with activated droplets of size range up to tens of micron (Pinnick et al, 1978;Hudson, 2004;Colomb et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of the Effects of Environmental and Fog Condensation Nuclei Parameters on the Rate of Fog Formation and Dissipation Using a New Laboratory Scale Fog Generation Facility

Singh

Gupta

Tripathi

et al. 2011

Aerosol Air Qual. Res.

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The IIT Kanpur Fog Chamber Facility has been conceptualized and built indigenously to study the fog formation and dissipation under various environmental conditions. The chamber has been designed such that all governing parameters can be controlled and optimized. The effects of relative humidity, temperature and size distribution, number and chemical composition of fog condensation nuclei (FCN) on the formation, stability and dissipation of fog has been studied. The visibility measurements were carried out using a He-Ne 632.8 nm monochromatic laser. It was found that aerosol number concentration, size distribution and chemical nature of FCN have significant effects on visibility reduction in fog. Direct comparisons were made for theoretical droplet growth and settling times in predicting the period for which stable fog was expected Vs the actual experimentally measured times for stable fog generated using different types of FCN. Effective radius, R eff , of fog droplet size distribution (DSD), a parameter that describes the optical properties of the droplet distribution was also calculated. It was noted that even for the same R eff (i.e. similar visibility), DSDs show notable differences depending on other conditions, implying the differences in the microphysical nature of fog. Fog dissipation results show that, with the decrease in temperature, the rate of fog dissipation decreases for all FCNs except for uncoated graphite, where no particular pattern has been observed maybe due to its less hygroscopic nature. The results from this study will help us in better understanding the optical nature of fog and designing of future fog vision devices.

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An innovative artificial fog production device improved in the European project “FOG”

Cited by 61 publications

References 9 publications

Static Estimation of the Meteorological Visibility Distance in Night Fog with Imagery

Static Estimation of the Meteorological Visibility Distance in Night Fog with Imagery

Image quality, meteorological optical range, and fog particulate number evaluation using the Sandia National Laboratories fog chamber

Experimental Study of the Effects of Environmental and Fog Condensation Nuclei Parameters on the Rate of Fog Formation and Dissipation Using a New Laboratory Scale Fog Generation Facility

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