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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 Fourier transform spectrometer was studied. The generation of nonlinearity was explained. The influence of nonlinearity on the spectrum was analyzed. Two methods of quadratic nonlinearity correction were introduced. Convolution method and iterative method . And the two methods are used to do quadratic nonlinear correction on the interferogram. Then a new method which is more suitable for the actual data is proposed based on the convolution method and the iterative method. Finally, the three methods are used to calibrate the simulated data and the actual data respectively. The experimental data show that the nonlinearity after the correction can be suppressed. And through the comparison found that the new calibration method has better accuracy and faster speed.