Spectral Radiance of Sky and Terrain at Wavelengths between 1 and 20 Microns II Sky Measurements*

Bell, E. E.; Eisner, Leonard; Young, James; Oetjen, Robert A.

doi:10.1364/josa.50.001313

Cited by 89 publications

(33 citation statements)

References 8 publications

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“…For simplicity, we will focus on ground level cooling. Exchange with the troposphere on the ground is limited by the atmospheric absorption spectrum [2,27,28,[34][35][36][37][38], which features a strong water vapor absorption band centered around 6 μm and beyond 20 μm, as well as a carbon dioxide absorption band that peaks around 15 μm. These absorption bands leave behind an atmospheric transmission window from 8 to 13 μm.…”

Section: Tropospheric Temperature and Atmospheric Transmittancementioning

confidence: 99%

Radiative sky cooling: fundamental physics, materials, structures, and applications

et al. 2017

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Radiative sky cooling reduces the temperature of a system by promoting heat exchange with the sky; its key advantage is that no input energy is required. We will review the origins of radiative sky cooling from ancient times to the modern day, and illustrate how the fundamental physics of radiative cooling calls for a combination of properties that may not occur in bulk materials. A detailed comparison with recent modeling and experiments on nanophotonic structures will then illustrate the advantages of this recently emerging approach. Potential applications of these radiative cooling materials to a variety of temperature-sensitive optoelectronic devices, such as photovoltaics, thermophotovoltaics, rectennas, and infrared detectors, will then be discussed. This review will conclude by forecasting the prospects for the field as a whole in both terrestrial and space-based systems.

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Section: Tropospheric Temperature and Atmospheric Transmittancementioning

confidence: 99%

Radiative sky cooling: fundamental physics, materials, structures, and applications

et al. 2017

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“…The sensitivity of the detector is shown in Figure 3. Using plotted radiance data from [1] the values for radiance from the clear sky and sunlit cloud are found to be 2*10 2 µW cm -2 sr -1 µm -1 and 2*10 3 µW cm -2 sr -1 µm -1 respectively. Multiplying by the area of the APD detector and the solid angle of the focusing light, we estimate that the background signal level coming out of the APD module is approximately 1.3 mV from clear sky and 13 mV from a sunlit cloud.…”

Section: Wild Opticsmentioning

confidence: 99%

Wide Area Wind Field Monitoring Status & Results

Marchant¹,

Simmons²

2011

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“…5(a). As the view angle approaches the horizon (01) from the zenith (901), the spectral radiance of the atmosphere approaches that of a black body at ground-level temperature [56]. This is attributed to the significantly increased path-length through the atmosphere for horizontal beam, and increased attenuation of IR-radiation at lower altitude.…”

Section: Law Asmentioning

confidence: 99%

Infrared signature studies of aerospace vehicles

Mahulikar

Sonawane

Rao

2007

Progress in Aerospace Sciences

284

111

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Infrared (IR) emissions from aircraft are used to detect, track, and lock-on to the target. MAN Portable Air Defence Systems (MANPADS) have emerged as a major cause of aircraft and helicopter loss. Therefore, IR signature studies are important to counter this threat for survivability enhancement, and are an important aspect of stealth technology. This paper reviews contemporary developments in this discipline, with particular emphasis on IR signature prediction from aerospace vehicles. The role of atmosphere in IR signature analysis, and relation between IR signature level and target susceptibility are illustrated. Also, IR signature suppression systems and countermeasure techniques are discussed, to highlight their effectiveness and implications in terms of penalties.

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Spectral Radiance of Sky and Terrain at Wavelengths between 1 and 20 Microns II Sky Measurements*

Cited by 89 publications

References 8 publications

Radiative sky cooling: fundamental physics, materials, structures, and applications

Radiative sky cooling: fundamental physics, materials, structures, and applications

Wide Area Wind Field Monitoring Status & Results

Infrared signature studies of aerospace vehicles

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