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Journal of Applied Remote Sensing

Estimating microwave emissivity of sea foam by Rayleigh method
Author(s): Shu-bo Liu; En-Bo Wei; Yan-Xia Jia
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Paper Abstract

To estimate microwave emissivity of sea foam consisting of dense seawater-coated air bubbles, the effective medium approximation is applied by regarding the foam layer as an isotropic dielectric medium. The Rayleigh method is developed to calculate effective permittivity of the sea foam layer at different microwave frequencies, air volume fraction, and seawater coating thickness. With a periodic lattice model of coated bubbles and multilayered structures of effective foam media, microwave emissivities of sea foam layers with different effective permittivities obtained by the Rayleigh method are calculated. Good agreement is obtained by comparing model results with experimental data at 1.4, 10.8, and 36.5 GHz. Furthermore, sea foam microwave emissivities calculated by well-known effective permittivity formulas are investigated, such as the Silberstein, refractive model, and Maxwell-Garnett formulas. Their results are compared with those of our model. It is shown that the Rayleigh method gives more reasonable results.

Paper Details

Date Published: 2 January 2013
PDF: 13 pages
J. Appl. Remote Sens. 7(1) 073598 doi: 10.1117/1.JRS.7.073598
Published in: Journal of Applied Remote Sensing Volume 7, Issue 1
Show Author Affiliations
Shu-bo Liu
En-Bo Wei, Chinese Academy of Sciences (China)
Yan-Xia Jia

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