Extinction of carbon-fiber powder calculated by the FDTD and turning bands methods at 35 GHz

The finite-difference time-domain (FDTD) method is used to calculate the specific extinction cross-section (SECS) of the carbon-fiber powder at 35 GHz. The digitized models with a random process using the turning bands method are simulated for the carbon-fiber powder. The digitized models of the car...

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Bibliographic Details
Main Authors: Hsing-Yi Chen, Chao-Cheng Ku
Format: Conference Proceeding
Language:English
Subjects:
carbon-fiber power
Correlation
FDTD
Finite difference methods
Mathematical model
Powders
Random processes
specific extinction cross-section
Time domain analysis
Turning
turning bands method
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Summary:The finite-difference time-domain (FDTD) method is used to calculate the specific extinction cross-section (SECS) of the carbon-fiber powder at 35 GHz. The digitized models with a random process using the turning bands method are simulated for the carbon-fiber powder. The digitized models of the carbon-fiber power having 12500 to 5832000 cubical particles with sell sizes in the range of 7 to 100 μm. It is found that the numerical result of SECS obtained by using the diameter of a cylindrical carbon-fiber particle as the cubical cell size for simulations makes good agreement with the measurement data. It is also found that the SECS is directly proportional to the particle number at 35 GHz. It is also found that the maximum extinction occurs at a resonant particle size. Using curve fitting technique together with Newton's Iteration method, the resonant particle size may be expressed by δ 0 =3408×n p -0.344 μm, where n p is the number of particles.
ISSN:1522-3965
1947-1491
DOI:10.1109/APS.2011.5996753