APPROXIMATIONS TO EXTINCTION FROM RANDOMLY ORIENTED CIRCULAR AND ELLIPTICAL CYLINDERS

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Authors
  1. Fournier, G.R.
  2. Evans, B.T.N.
Corporate Authors
Defence Research Establishment Valcartier, Valcartier QUE (CAN)
Abstract
Analytic approximation to the extinction efficiency, Qext, are given for oriented and randomly oriented circular infinite cylinders based on anomalous diffraction. The results are compared with the exact code. These results are further generalized to randomly oriented elliptical cylinders. With the use of the formulae, Qext can be evaluated over E4 times faster than with the exact code. This approximation is valid for complex refractive indices m = n - ik, where 1 less than or equals to n less than or equals to proportional to and 0 less than or equals to k less than or equals to k less than or equals to 3, aspect ratios from 1 to 4, and modes to large particle sizes. The accuracy and limitations of these formulaes are discussed.
Keywords
Polydispersions
Date of publication
30 Jul 1996
Number of Pages
12
Reprinted from
Applied Optics, vol 35, no 21, 1996, p 4271-4282
DSTKIM No
96-03132
CANDIS No
499617
Format(s):
Hardcopy;Document Image stored on Optical Disk

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