基于改进切趾函数的Fourier光谱仪光谱复原效果的提高

The Advancement of Spectrum Reconstruction Effect of Fourier Spectrometer Based on Improved Apodization Function

为校正Blackman Harris切趾函数在Fourier变换光谱仪切趾处理过程中主瓣宽度过宽的缺点,提出了一种改进的Blackman Harris切趾函数。首先介绍了干涉图切趾的基本原理,然后增加可调参数m,引入Chebyshev函数对Blackman Harris切趾函数进行改进,并通过幅频响应曲线对比了改进前后2种切趾函数的性能;最后利用Matlab仿真分析改进的切趾函数与几种典型函数的光谱复原效果。仿真结果表明,改进的切趾函数不仅在主瓣宽度特性上有所提高,而且旁瓣衰减可调节,工程使用更加灵活。

In order to rectify the shortcomings of large main lobe width of Blackman Harris apodization function in apodization processing of Fourier transform spectrometer,an improved Blackman Harris apodization function is put forward. Firstly this paper introduces the basic principle of apo-dized interferogram,and then adds a tunable parameter m, introduces Chebyshev function to im- prove Blackman Harris function, and compares the performances of two apodization functions be- fore and after improvement through amplitude-frequency response curves, finally uses Matlab to simulate and analyze the spectrum reconstruction effect of improved apodization function and sever- al typical apodization funcation. The simulation results show： for the improved apodization func- tion,not only the characteristics of main lobe width is enhanced,but also the side lobe attenuarion can he adjusted;so the function is more flexible in engineering application.