傅里叶变换红外光谱仪可实现对高温烟气的多组分同时测量,在该方面具有广泛的应用前景.而决定其能否成功应用的重要因素之一,在于测量系统中对红外干涉图采样的相位误差控制.论述了系统相位误差产生的主要原因,通过分析氦氖激光干涉信号过零均匀性,说明了产生相位误差的主要原因是激光信号与参考信号的相位差.与此同时,定量分析了相位误差对仪器信噪比的影响,通过Mertz相位校正方法得到了仪器信噪比较之原来提高了数千倍.并进行了相关实验.实验结果表明,基于此干涉图采样方法的系统满足高温烟气测量的需要.

Fourier transform infrared spectrometer can be realized in high temperature flue gas multicomponent measurement at the same time,has wide application prospects in the field.And one of the important factors to determine the success of application,lies in the measuring system of infrared interference figure sampling phase error control.This paper discusses the main reasons of the appearance of phase error in the system,through the analysis of Helium-neon laser interference signal zero uniformity,illustrates the produce phase error is the main reason of the laser signal and reference signal phase difference.At the meantime,the quantitative analysis of the phase error influence on instrument signal to noise ratio(SNR),also the Mertz phase correction method for the instrument improves the thousands of times of the original signal to noise ratio.And the related experiment,the experimental results show that the system based on the interference figure sampling method satisfy the needs of high temperature flue gas measurements.