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Modelling Laboratory Data of Bidirectional Reflectance of a Regolith Surface Containing Alumina

Published online by Cambridge University Press:  02 January 2013

C. Bhattacharjee ,
D. Deb ,
H. S. Das ,
A. K. Sen  and
R. Gupta
C. Bhattacharjee*
Affiliation:
Department of Physics, Assam University, Silchar 788011, India Department of Physics, Kokrajhar Government College, Kokrajhar 783370, India
D. Deb
Affiliation:
Department of Physics, Assam University, Silchar 788011, India
H. S. Das
Affiliation:
Department of Physics, Assam University, Silchar 788011, India
A. K. Sen
Affiliation:
Department of Physics, Assam University, Silchar 788011, India
R. Gupta
Affiliation:
The Inter-University Centre for Astronomy and Astrophysics, Pune University Campus, Pune 411007, India
*
DCorresponding author. Email: [email protected]
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Abstract

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Bidirectional reflectance of a surface is defined as the ratio of the scattered radiation at the detector to the incident irradiance as a function of geometry. Accurate knowledge of the bidirectional reflection function for layers composed of discrete, randomly positioned scattering particles is essential for many remote sensing, engineering, and biophysical applications, as well as for different areas of astrophysics. Computations of bidirectional reflection functions for plane parallel particulate layers are usually reduced to solving the radiative transfer equation by the existing techniques. In this work we present our laboratory data on bidirectional reflectance versus phase angle for two sample sizes of alumina, 0.3 and 1 μm, for the He–Ne laser at wavelengths of 632.8 nm (red) and 543.5 nm (green). The nature of the phase curves of the asteroids depends on the parameters like particle size, composition, porosity, roughness, etc. In the present study we analyze data which are being generated using a single scattering phase function, that is, Mie theory of treating particles as a compact sphere. The well-known Hapke formula, along with different particle phase functions such as Mie and Henyey–Greenstein, will be used to model the laboratory data obtained at the asteroid laboratory of Assam University.

Keywords

comets: generaldust: extinctionscatteringpolarization
Type
Research Article
Information
Publications of the Astronomical Society of Australia , Volume 28 , Issue 3 , 2011 , pp. 261 - 265
Copyright
Copyright © Astronomical Society of Australia 2011

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