Infrared Spectral Radiance Of The Sky

Ben-Shalom, A.; Devir, Adam D.; Lipson, S. G.

doi:10.1117/12.7973144

Cited by 7 publications

(3 citation statements)

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“…In earlier work, Ben Shalom et al (1983) , Hughes (1987) and Wollenweber (1990) presented results which proved the dependence of LOWTRAN radiances on layer thickness of the atmospheric model used. Especially for optical paths close to the horizon LOWTRAN 6 calculated radiances showed a strange behaviour with zenith angle (Wollenweber, 1990), that could be fixed by subdividing the atmospheric layers.…”

Section: Introductionmentioning

confidence: 73%

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<title>Impact of atmospheric layering on LOWTRAN radiance calculations</title>

Wollenweber¹

1992

SPIE Proceedings

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The computer code LOWTRAN is widely and extensively used for the calculation of the propagation of IR radiation through the atmosphere and of sun and sky radiances. This paper evaluates LOWTRAN 7 calculated 8-12 pm radiances compared to measured sky radiances.Generally a good agreement was found between calculated and measured radiances, except for the LOWTRAN 7 single scattering mode, that uses the so called conservative scattering approach, which results in sky radiances far to high especially for optical paths with zenith angles close to the horizon. There was no significant difference found between LOWTRAN7 multiple scattering and LOWTRAN 6 radiances in the 8-12 pm wavelength region. The LOWTRAN 6 results fitted the measured radiances slightly better than the LOWTRAN 7 MS radiances. An artifact in LOWTRAN 6 radiances for zenith angles close to the horizon that could be attributed to insufficient vertical layering could not be found in LOWTRAN 7 multiple scattering results. The necessary vertical layering -for optical paths close to the horizon was found to depend on visibility and on the vertical length scale of atmospheric features (e.g. temperature inversions).

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Section: Introductionmentioning

confidence: 73%

“…The LOWTRAN 7 single scattering mode (Equation 2) employs the conservative scattering method suggested by Ben Shalom et al (1983) (t(i) is total transmittance to the i'th layer). The LOWTRAN 7 multiple scattering version uses a two stream approach (Equation 3) as described by Isaacs et al (1987).…”

Section: Measurements and Lowtran Radiance Calculationsmentioning

confidence: 99%

<title>Impact of atmospheric layering on LOWTRAN radiance calculations</title>

Wollenweber¹

1992

SPIE Proceedings

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“…Such tools are the simulation software of a thermal scene. Simulation of the detection system, object, and environment is useful for determination of signal-to-noise ratio as a basis of analysis of the received electrical signal [1,2]. Thus, many problems can be solved already at the stage of thermodetection device design.…”

Section: Introductionmentioning

confidence: 99%