Research Papers

Estimating microwave emissivity of sea foam by Rayleigh method

[+] Author Affiliations
Shu-Bo Liu

Chinese Academy of Sciences, Institute of Oceanology, Qingdao 266071, China

Graduate University of Chinese Academy of Sciences, Beijing 100039, China

En-Bo Wei

Chinese Academy of Sciences, Institute of Oceanology, Qingdao 266071, China

Yan-Xia Jia

Hisense Trans-Tech Company Limited, Qingdao 266071, China

J. Appl. Remote Sens. 7(1), 073598 (Jan 02, 2013). doi:10.1117/1.JRS.7.073598
History: Received April 12, 2012; Revised December 1, 2012; Accepted December 6, 2012
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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.

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© 2013 Society of Photo-Optical Instrumentation Engineers

Citation

Shu-Bo Liu ; En-Bo Wei and Yan-Xia Jia
"Estimating microwave emissivity of sea foam by Rayleigh method", J. Appl. Remote Sens. 7(1), 073598 (Jan 02, 2013). ; http://dx.doi.org/10.1117/1.JRS.7.073598


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