Error Analysis and Calibration Method of Complex Spectrum of Fourier Transform Infrared Spectrometer
ZHANG Tian-shu, LIU Wen-qing, GAO Min-guang, LU Yi-huai, LIU Jian-guo, XU Liang, ZHU Jun Chinese Academy of Sciences, Anhui Institute of Optic and Fine Machines, Hefei 230031, China
The phase shift in complex spectrum of Fourier transform infrared (FTIR) spectrometer was discussed. A rigorous derivation showed the relation between the phase shift and complex spectrum. The reason for the radiation offset in FTIR measurement was analysed. The present article presents a calibration method of FTIR complex spectrum, which can adjust the radiation offset. The comparison between experiment data and theoretical computation showed that the method is precise.