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a=1;
t=0:0.001:1;
fm=100;%µ¥Î»ÎªkHZ£¬µ÷ÖÆÆµÂÊ
mol=0.9*a*sawtooth(2*pi*fm*t,0.5);            
d0=100;    %Õñ·ù
f0=0.1;    %Õñ¶¯µÄƵÂÊ(KHZ)
d=d0*sin(2*pi*f0*t);
fi=4*pi*d/632.8;
m=1;   %µ÷ÖÆÉî¶È
I=1-m*cos(mol+fi);
subplot(5,1,1),plot(t,mol);axis([0,0.1,-5,5]);
subplot(5,1,2),plot(t,I);axis([0,0.1,0,2]);
dI=gradient(I,0.5);   %¶ÔIÇó΢·Ö
subplot(5,1,3),plot(t,dI);axis([0,0.1,-10,10]);
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