Optical constants of petroleum samples in the 0.25?25 ? range

Al'perovich, L. I.; Komarova, A. I.; Narziev, B.N.; Pushkarev, V. N.

doi:10.1007/bf00608110

Cited by 6 publications

(3 citation statements)

References 1 publication

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“…For the lower wavelength λ = 3.4 µm, the differences between a heavy and a light oil is not significant, making the oil characterization impossible. By contrast, for λ = 10 µm, differences between the two oil types appear for either low or high observation an- [6] with the salinity adjustment from Friedman [7]), and the oil [8,9] gles θ. Thus, this highlights the possibility of characterizing different oil types at this typical wavelength, which can be useful to determine the origin of an oil pollution.…”

Section: Infrared Emissivity Of Clean and Contaminated Seasmentioning

confidence: 88%

“…This implies that the whole oil film problem can be treated from the single air/oil surface problem, by substituting the Fresnel reflection coefficient of air/oil single interface for the equivalent Fresnel reflection coefficient of the air/oil/sea film. The calculations are led for IR wavelengths, inside the two windows regions 3 − 5 µm and 8 − 13 µm at the wavelengths 3.4 µm and 10 µm, for which the refractive indexes of the sea water (taken from the refractive index of pure water by Hale and Querry [6] with the salinity adjustment from Friedman [7]) and the oil [8,9] are given in Table 1. Since under the GOA, the emissivity depends on the slope PDF (Probability Density Function), the RMS slope along the wind direction of a contaminated sea surface must be calculated.…”

Section: Introductionmentioning

confidence: 99%

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Unpolarized infrared emissivity of oil films on sea surfaces

Pinel

Bourlier

2009

2009 IEEE International Geoscience and Remote Sensing Symposium

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The unpolarized infrared emissivity of oil films on sea surfaces is derived under the geometric optics approximation. The multiple reflections at each of interface are ignored, but the multiple reflections between the upper and lower interfaces of the oil film are taken into account. The oil film is assumed to be thin, so that the two interfaces can be considered as parallel and identical. Thus, under the geometric optics approximation, the oil film can locally be seen as a Fabry-Pérot interferometer. Thus, the emissivity of the contaminated sea can easily be obtained from the emissivity of the air/oil interface only. Emissivity comparisons between clean and contaminated seas are then presented to study the oil film detectability.

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Section: Infrared Emissivity Of Clean and Contaminated Seasmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Unpolarized infrared emissivity of oil films on sea surfaces

Pinel

Bourlier

2009

2009 IEEE International Geoscience and Remote Sensing Symposium

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“…Several studies exist in literature about the effect of certain types of crude oil on the refractive index of pure water at visible wavelengths, indicating that most emulsions can easily exhibit values up to 1.5 or even higher (Król et al, 2006;Otremba, 2000;Otremba & Piskozub, 2003). Unfortunately, data in the SWIR are scarce and somewhat dated, but seem to indicate that also in this spectral region a similar increase can be expected (Al'perovich et al, 1978;den Boer et al, 1995). A possible reason for the lack of data in the SWIR is the difficulty in resolving oscillations of the real part of the refractive index in regions with strong absorption features (as predicted by the Kramers-Kronig dispersion relations), and reflectance spectra of the Deepwater oil indeed show alkane absorption in the SWIR region (Clark et al, 2010).…”

Section: Sensitivity Studymentioning

confidence: 97%

Polarimetric retrievals of surface and cirrus clouds properties in the region affected by the Deepwater Horizon oil spill

Ottaviani

Cairns

Chowdhary

et al. 2012

Remote Sensing of Environment

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In 2010, the Goddard Institute for Space Studies (GISS) Research Scanning Polarimeter (RSP) performed several aerial surveys over the region affected by the oil spill caused by the explosion of the Deepwater Horizon offshore platform. The instrument was deployed on the NASA Langley B200 aircraft together with the High Spectral Resolution Lidar (HSRL), which provides information on the distribution of the aerosol layers beneath the aircraft, including an accurate estimate of aerosol optical depth. This work illustrates the merits of polarization measurements in detecting variations of ocean surface properties linked to the presence of an oil slick. In particular, we make use of the degree of linear polarization in the glint region, which is severely affected by variations in the refractive index but insensitive to the waviness of the water surface. Alterations in the surface optical properties are therefore expected to directly affect the polarization response of the RSP channel at 2264 nm, where both molecular and aerosol scattering are negligible and virtually all of the observed signal is generated via Fresnel reflection at the surface. The glint profile at this wavelength is fitted with a model which can optimally estimate refractive index, wind speed and direction, together with aircraft attitude variations affecting the viewing geometry. The retrieved refractive index markedly increases over oil-contaminated waters, while the apparent wind speed is significantly lower than in adjacent uncontaminated areas, suggesting that the slick dampens high-frequency components of the ocean wave spectrum. The constraint on surface reflectance provided by the shortwave infrared channels is a cornerstone of established procedures to retrieve atmospheric aerosol microphysical parameters based on the inversion of the RSP multispectral measurements. This retrieval, which benefits from the ancillary information provided by the HSRL, was in this specific case hampered by prohibitive variability in atmospheric conditions (very inhomogeneous aerosol distribution and cloud cover). Although the results presented for the surface are essentially unaffected, we discuss the results obtained by typing algorithms in sorting the complex mix of aerosol types, and show evidence of oriented ice in cirrus clouds present in the area. In this context, polarization measurements at 1880 nm were used to infer ice habit and cirrus optical depth, which was found in the subvisual/threshold-visible regime, confirming the utility of the aforementioned RSP channel for the remote sensing of even thin cold clouds.

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Comparison of three methods for determining optical constants of liquid materials based on transmittance spectrum of optical cell

Zhang

et al. 2017

Optik

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Optical constants of petroleum samples in the 0.25?25 ? range

Cited by 6 publications

References 1 publication

Unpolarized infrared emissivity of oil films on sea surfaces

Unpolarized infrared emissivity of oil films on sea surfaces

Polarimetric retrievals of surface and cirrus clouds properties in the region affected by the Deepwater Horizon oil spill

Comparison of three methods for determining optical constants of liquid materials based on transmittance spectrum of optical cell

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