傅立叶变换红外光谱仪(FTIR)中,为了提高采样精度,采用参考激光计量光程差。但由于激光单稳频特性、动镜移动速度不均匀、电路延时等原因,引起采样点偏差。文章根据光谱仪的干涉原理,通过傅立叶逆变换和误差分析方法,建立了光谱测量相对误差与采样点偏差之间的理论模型,并进行仿真验证,结果表明该模型可以成为由采样点偏差引起相对误差修正算法的理论依据。 Fourier transform infrared spectrometer (FTIR), in order to improve the sampling accuracy, the use of reference laser measuring optical path difference. However, due to the characteristics of laser monostable frequency, moving mirror moving speed is not uniform, circuit delay and other reasons, causing sampling point deviation. According to the interference principle of the spectrometer, the theoretical model between the relative error of the spectral measurement and the sampling point deviation is established by means of inverse Fourier transform and error analysis, and the simulation results show that the model can be the relative error caused by the sampling point deviation Correction algorithm theoretical basis.