针对傅里叶变换光谱仪探测器引起的非线性进行研究, 阐述了非线性的产生、分析了非线性对光谱的影响以及介绍了两种校正二次项非线性的方法: 卷积法和迭代法。并采用这两种方法对干涉图进行二次非线性校正, 然后在卷积法与迭代法的基础上提出一种更适用于实际数据的新方法。最后采用这三种方法对模拟数据以及实际采集数据分别进行非线性校正, 实验数据说明校正后非线性能得到抑制。并且通过对比发现, 新的校正方法有较好的精度及更快的速度。

The non-linearity caused by the detector of the Fourier transform spectrometer was studied, and the influence of non-linearity on the spectrum was discussed. The quadratic non-linearity correction methods were also discussed: convolution method and iterative method. Then the two methods were used to correct the nonlinear data. A new method which is more suitable for practical data was proposed based on both convolution method and iterative method. Finally, the three methods were used to correct the non-linearity of the simulated data and the actual data. The experimental data shows that the nonlinear performance of the data after correction was restrained. And it was found that compared with the other two methods, the new method has better accuracy and faster speed.