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在弹光调制傅里叶变换光谱仪(PEM-FTS)中,由于调制光程差的非线性,不能直接采用快速傅里叶变换(FFT)进行反演光谱,且直接计算开销过大。首先在Matlab软件中用非均匀快速傅里叶变换算法(NUFFT)对PEM非等相位干涉信号进行了软件仿真,其次设计了以TMS320C6713高性能浮点数字信号处理器(DSP)芯片为核心的光谱信息处理系统,实现了硬件上的光谱实时处理。研究表明,算法对光谱反演具有速度快、精度高等优点,1024点光谱反演的速度较直接运算的速度提高20多倍,反演精度可达0.78%。
In pop-up modulation Fourier transform spectroscopy (PEM-FTS), the inverse spectrum can not be directly derived from FFT due to the nonlinearity of the modulated optical path difference, and the direct calculation overhead is too large. Firstly, the non-uniform phase interference signal of PEM is simulated by NUFFT in Matlab software, and then the spectrum centered on TMS320C6713 high-performance floating-point digital signal processor (DSP) chip is designed. Information processing system to achieve the real-time spectrum of hardware processing. The research shows that the algorithm has the advantages of fast speed and high accuracy for spectral inversion. The speed of 1024-point spectral inversion is more than 20 times faster than that of direct computation, and the inversion accuracy can reach 0.78%.