mie_xscan.m

计算尺寸因子对消光效率和散射效率

function result = Mie_xscan(m, nsteps, dx)

% Computation and plot of Mie Efficiencies for given 
% complex refractive-index ratio m=m'+im" 
% and range of size parameters x=k0*a, 
% starting at x=0 with nsteps increments of dx
% a=sphere radius, using complex Mie coefficients an and bn 
% according to Bohren and Huffman (1983) BEWI:TDD122
% result: m', m", x, efficiencies for extinction (qext), 
% scattering (qsca), absorption (qabs), backscattering (qb), 
% qratio=qb/qsca and asymmetry parameter (asy=<costeta>).
% C. M鋞zler, May 2002.

nx=(1:nsteps)';
x=(nx-1)*dx;
for j = 1:nsteps
    a(j,:)=mie(m,x(j));
end;
output_parameters='Qext, Qsca, Qabs, Qb, <costeta>, Qb/Qsca'

% plotting the results
m1=real(m);m2=imag(m);
plot(x,a(:,1:6))
legend('Qext','Qsca','Qabs','Qb','<costeta>','Qb/Qsca')
title(sprintf('Mie Efficiencies, m=%g+%gi',m1,m2))
xlabel('x')

result=a;