matlab画正弦反射波和折射波
时间: 2023-07-13 09:22:23 浏览: 257
您好!要画正弦反射波和折射波,可以使用 Matlab 中的 plot 函数。下面是一个简单的示例代码:
```matlab
% 定义正弦波参数
A = 1; % 振幅
f = 1; % 频率
T = 1/f; % 周期
t = 0:0.001:T; % 时间范围
% 计算反射波
r = -0.5; % 反射系数
y1 = A*sin(2*pi*f*t); % 入射波
y2 = r*A*sin(2*pi*f*t-T/4); % 反射波
y3 = y1+y2; % 总波形
% 计算折射波
n1 = 1; % 入射介质折射率
n2 = 1.5; % 折射介质折射率
theta1 = pi/3; % 入射角
theta2 = asin(n1*sin(theta1)/n2); % 折射角
r = (n1*cos(theta1)-n2*cos(theta2))/(n1*cos(theta1)+n2*cos(theta2)); % 反射系数
t = 2*n1*cos(theta1)/(n1*cos(theta1)+n2*cos(theta2)); % 透射系数
y4 = t*A*sin(2*pi*f*n1/n2*t-T/2); % 折射波
% 绘制波形图
figure;
subplot(2,1,1);
plot(t, y1, 'r', t, y2, 'g', t, y3, 'b');
title('反射波');
xlabel('时间');
ylabel('振幅');
legend('入射波', '反射波', '总波形');
subplot(2,1,2);
plot(t, y1, 'r', t, y4, 'g');
title('折射波');
xlabel('时间');
ylabel('振幅');
legend('入射波', '折射波');
```
上述代码中,我们首先定义了正弦波的参数,然后计算反射波和折射波。最后使用 subplot 函数将两个波形图绘制在同一个画布上。您可以根据需要修改代码中的参数来调整波形的形状和大小。
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