Effective Absorption Coefficient of Rectanguar Areas of Absorbent Material

1957 ◽  
Vol 29 (1) ◽  
pp. 178-178
Author(s):  
Eric D. Daniel
Keyword(s):  
Absorption Coefficient ◽  
Effective Absorption Coefficient ◽  
Absorbent Material ◽  
Effective Absorption

Information Content of AVHRR Channels 4 and 5 with Respect to the Effective Radius of Cirrus Cloud Particles

1991 ◽  
Vol 30 (7) ◽  
pp. 973-984 ◽  
Author(s):  
F. Parol ◽  
J. C. Buriez ◽  
G. Brogniez ◽  
Y. Fouquart
Keyword(s):  
Absorption Coefficient ◽  
Mean Value ◽  
Effective Radius ◽  
Forward Peak ◽  
Effective Absorption Coefficient ◽  
Brightness Temperatures ◽  
Microphysical Properties ◽  
Effective Absorption ◽  
Cloud Particles ◽  
The Relationship

Abstract This paper investigates the important difference in the relationship between brightness temperatures between the 11-μm and the 12-μn AVHRR data and the microphysical properties of the semitransparent cirrus clouds. In the nonscattering approximation, the emittance for channels 4 and 5 are related through the absorption coefficient ratio that is the key parameter giving access to the size of cloud particles. The observed mean value of this parameter corresponds to effective radius of 18 μm for polydisperse spheres and 12 μm for polydisperse infinitely long ice cylinders. Taking the multiple scattering into account, the brightness temperature difference enhances much more for cylinders than for spheres owing to the fact that the forward peak of scattering is less large for cylinders. To obtain the size of cloud particles, the method developed in the nonscattering case is still applicable if one makes use of the effective emittance that implicitly includes the effects of mattering. Thus, an effective absorption coefficient ratio is defined and we derive a direct relationship between this ratio and the optical properties of the cloud particles. The mean value of the effective absorption coefficient ratio corresponds to ice spheres of effective radius of 26 μm or a bit less in the case of water spheres (supercooled droplets), but no agreement can be obtained for fully randomly oriented cylinders.

Determination of the effective absorption coefficient for light in long plastic scintillators

1965 ◽  
Vol 2 (4) ◽  
pp. 242-244
Author(s):  
Yu. A. Tsirlin ◽  
A. R. Daich ◽  
T. I. Sokolovskaya ◽  
L. L. Nagornaya
Keyword(s):  
Absorption Coefficient ◽  
Effective Absorption Coefficient ◽  
Effective Absorption ◽  
Plastic Scintillators

Transmittance of Distilled Water and Sodium-Chloride-Water Solutions

1988 ◽  
Vol 110 (2) ◽  
pp. 113-119 ◽  
Author(s):  
K. Kanayama ◽  
H. Baba
Keyword(s):  
Absorption Coefficient ◽  
Water Surface ◽  
Pure Water ◽  
Specimen Thickness ◽  
Wavelength Band ◽  
Spectral Transmittance ◽  
Effective Absorption Coefficient ◽  
Water Solutions ◽  
Solar Pond ◽  
Effective Absorption

The spectral transmittance of pure water and salt water solutions of various concentrations, which are important for the thermal calculation of a solar pond, is measured experimentally for specimen thickness of 1 to 100 mm by means of an autorecording spectro-radiometer inside an air-conditioned room. On the basis of the measured spectral transmittance, the total transmittance of pure and salty waters to 3 m of water depth is calculated as a ratio of the total radiation energy over all wavelengths arriving at any depth from the water surface of the solar pond to the solar radiation incident upon the water surface with various air masses. According to Nielsens’ four-partition method, the effective absorption coefficient is calculated for each wavelength band. Lastly, the transmission properties obtained for pure water, i.e., spectral and total transmittances, absorption wavelength band, and effective absorption coefficient, are compared with past results, and those for salty water with various concentrations are compiled as basic data for the use of solar energy by a solar pond.

scholarly journals Effective absorption coefficient of a graphene atop of silicon nitride nanophotonic circuit

2020 ◽  
Vol 1695 ◽  
pp. 012135
Author(s):  
S Komrakova ◽  
V Kovalyuk ◽  
P An ◽  
A Golikov ◽  
M Rybin ◽  
...  
Keyword(s):  
Silicon Nitride ◽  
Absorption Coefficient ◽  
Effective Absorption Coefficient ◽  
Effective Absorption
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