Abstract
An analytical model developed to calculate the radiative energy transmission through a fibrous layer is verified by the experimental results obtained via measurement of the transmittance of a He-Ne laser beam through nickel-fiber sheets with a large size parameter. The model is used to calculate the radiative energy transmission by the Monte Carlo method and the optical characteristics of a fiber with large size parameter are estimated by the method developed by Yamada et al. Which considers the diffraction and reflection by the fiber. The following results are obtained. The results of the analysis agree very well with the experimental ones. The directional profile of the transmitted energy becomes flatter when the thickness of the fibrous layer is increased. When the number of fibers with orientations other than parallel to the fibrous layer is increased, the transmittance is increased. Even when fibers have varying diameters in the range of 20∼28μm, the transmittance is the same as in the case of the fibrous layer with uniform average diameter of 24μm.
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