Fourier transform infrared spectrometer and gas concentration detection method

The invention discloses a Fourier transform infrared spectrometer and a gas concentration detection method. The Fourier transform infrared spectrometer comprises a laser source; an interference module which comprises a prism, a beam splitting sheet, a quarter-wave plate, a fixed mirror, a compensation plate, and a moving mirror; and a photoelectric information conversion module which comprises a beam splitter prism and two photoelectric tubes. 一种傅立叶变换红外光谱仪及气体浓度检测方法，该傅立叶变换红外光谱仪包括：激光源；干涉模块，其中，所述干涉模块包括：棱镜；分束片；四分之一波片；定镜；补偿片；动镜；以及光电信息转换模块，包括：分光棱镜；以及两个光电管。