Results 161 to 170 of about 17,886 (205)
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1998
The Radiometric Physics Division is one of eight divisions within the Physics Laboratory at the National Institute of Standards and Technology (NIST). It conducts research programs and associated activities to fulfill its primary goals, to: (1) Develop, improve, and maintain the national standard and measurement techniques for radiation ...
Albert N. Link, John T. Scott
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The Radiometric Physics Division is one of eight divisions within the Physics Laboratory at the National Institute of Standards and Technology (NIST). It conducts research programs and associated activities to fulfill its primary goals, to: (1) Develop, improve, and maintain the national standard and measurement techniques for radiation ...
Albert N. Link, John T. Scott
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Spectral Changes Observed in Irradiated Glycine
Physics in Medicine & Biology, 1966The electron spin resonance spectra from irradiated glycine have been investigated as a function of dose and time. Single crystals were examined at various orientations, with the most significant changes occurring in the (0, 0, 1) direction. The portion of each spectrum attributed to the radical NH3+ C H COO- appeared unchanged, but that due to ·CH2COO-
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Photochemistry and Photobiology, 1980
Abstract— We present an analytic characterization of upward and downward diffuse spectral irradiance for the wavelength range 280–380 nm, solar zenith angle range from 0 to 86, altitude range from 0 to 5 km and for non‐zero surface albedo. This work is a modification and extension of the previous work of Green, Cross and Smith based upon the radiative ...
P F, Schippnick, A E, Green
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Abstract— We present an analytic characterization of upward and downward diffuse spectral irradiance for the wavelength range 280–380 nm, solar zenith angle range from 0 to 86, altitude range from 0 to 5 km and for non‐zero surface albedo. This work is a modification and extension of the previous work of Green, Cross and Smith based upon the radiative ...
P F, Schippnick, A E, Green
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Measuring and traceable methods of spectral irradiance and ultraviolet irradiance
SPIE Proceedings, 2011This paper mainly discusses the measuring and traceable methods of spectral irradiance and ultraviolet irradiance in order to advance the accuracy of the two quantities. The contents include: 1.The working principal of the primary standard apparatus of spectral irradiance and spectral radiance and the value transferring methods of spectral irradiance.
Bo Huang +4 more
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SOLAR SPECTRAL IRRADIANCE IN THE VISIBLE AND INFRARED REGIONS
Photochemistry and Photobiology, 1988Abstract— The analytical formulas previously developed for estimating the spectral irradiance reaching the ground in the ultraviolet are extended into the visible and infrared(350–3000 nm). This approach has two distinct features: (1) all physical inputs for calculating the direct irradiance are given in analytical form, and (2) the diffuse spectral ...
A E, Green, S T, Chai
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Absolute spectral irradiance scale in the 700–2400 nm spectral range
Applied Optics, 1990An absolute spectral irradiance scale for the 700-2400 nm range has been developed. The scale is based on an absolute radiometer and a series of interference filters, which were used to determine the spectral irradiance of quartz halogen incandescent lamps at a number of discrete wavelengths.
P, Corredera +3 more
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Spectral measurements of asymmetrically irradiated capsule backlighters
Review of Scientific Instruments, 2016Capsule backlighters provide a quasi-continuum x-ray spectrum over a wide range of photon energies [J. F. Hansen et al., Rev. Sci. Instrum. 79, 013504 (2008)]. Ideally one irradiates the capsule backlighter symmetrically, however, in complex experimental geometries, this is not always possible.
P. A. Keiter, R. P. Drake
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Spectral irradiance of daylight at Pretoria
Journal of Physics D: Applied Physics, 1972Average spectral irradiance values are given for total daylight, skylight and south sky irradiances as measured during seven months at Pretoria. Special attention is given to values for air mass 1 to enable comparison with data obtained elsewhere.
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Backscattering of Spectral Irradiance by Bubbles
1999Abstract : Our work is focused towards the analysis of the scattering properties of bubbles in the upper ocean, and their effect on the hyperspectral reflectance of the sea, both as a result of natural bubble introduction (e.g. breaking waves) and as a result of man-made injections (e.g. ship wakes).
Alex Hay, Bruce Johnson, Marlon R. Lewis
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Modelling Short-Term Spectral Irradiance Variations
Space Science Reviews, 2000On time-scales of the solar rotation most of the solar irradiance variations are caused by the changing distribution of solar surface magnetic features. We model these short-term irradiance variations using calculations of sunspot and facular contrasts as a function of wavelength and limb angle on the Sun.
Fligge, M., Solanki, S., Unruh, Y.
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