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hxj2008

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[½»Á÷] ¡¾ÇóÖú¡¿Í¨¹ý¸µÀïÒ¶±ä»»ÓɸÉÉæ¹âÇ¿ÇóÆä¹âÆ×µÄÎÊÌâ

ÎÒ±àÁËÒ»¸öµ¥É«¹âÑîÊÏË«·ì¸ÉÉæ³ÌÐò£¬Í¨¹ýÆä¹âÇ¿ÇóËüµÄ¹âÆ×£¬µ«ÎÒÖ»»­³öÁ˺á×ø±êΪÏñËØÖµ£¬×Ý×ø±êΪ·ù¶ÈµÄ¹âÆ×ͼ¡£ÇëÎÊÔõÑù°ÑÏñËØÖµÓë·ù¶ÈµÄ¹âÆ×ͼת»¯Îª²¨³¤£¨»ò²¨Êý£©ºÍ·ù¶ÈµÄ¹âÆ×ͼ£¿
clear
Lam=700e-9;
v=1/Lam;
l=6e-3;   %²¨Êý
d=2;
%µ¥±ßÈ¡Ñù
xm=5*Lam*d/l;   n=1001;
x=linspace(0,xm,n);
dx=(xm-0)/(n-1);   %×ø±êx²½³¤
t=l*x/d;   %¹â³Ì²î
dt=l*dx/d;   %¹â³Ì²î²½³¤
I0=1;   
I=4.*I0.*(cos(pi.*v.*t)).^2;
%×ø±êÖµºÍ¹âÇ¿µÄ¹ØÏµ
figure
plot(x,I)
xlabel('x');
ylabel('I');
grid on
%¹â³Ì²îºÍ¹âÇ¿µÄ¹ØÏµ
figure
plot(t,I)
xlabel('t');
ylabel('I');
grid on

It=I-I(:,1)/2;  %¼õÈ¥Ö±Á÷³É·Ö
B=fft(I);
mag=abs(B);
%ºá×ø±êΪÏñËØÖµ
figure
plot(mag)

[ Last edited by hxj2008 on 2010-3-16 at 19:00 ]
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hxj2008

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lgh6758

½ð³æ (ÕýʽдÊÖ)

hxj2008(½ð±Ò+1): 2010-03-17 19:02
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