短时傅里叶变换技术存在窗口问题，限制了垂向分辨率，而且不能适应地层厚度的变化；
STFT method has the window problem, which limits the vertical resolution, and cannot adapt the thickness transverse change of layers.
获取了薄膜的折射率和消光系数随波长的变化曲线以及薄膜的厚度。
The curves of refraction index and extinction coefficient with different wavelength and the thickness of films were obtained from transmission spectrum.
同时研究了薄膜厚度、入射角及波长的微小变化（或误差）对于该偏振器消光率的影响。
And the effects of small changes of thin film thickness, incident angle and wavelength on extinction index of this polarizer are also studied.
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