Design of a rotating fourier transform infrared spectrometer system

Abstract Fourier Transform Infrared (FTIR) spectrometers are the mainstay of modern infrared spectral analysis. While traditional FTIR spectrometers and new static FTIR spectrometers each have their strengths, they struggle to balance key performance metrics such as spectral measurement frequency, radiant flux, resolution, and coverage range. Our study has developed a novel FTIR spectrometers based on a rotating interferometer, capable of meeting the demands for high-sensitivity, real-time dynamic analysis of material composition in fields like precise biochemical reaction analysis. To address the non-linearity in optical path difference changes within interferometers, we’ve designed a new type of rotating interferometer that incorporates a single-frequency laser, enabling equal optical path difference interval sampling and thus preventing spectral errors. The system’s effectiveness and feasibility were validated through simulations and alcohol flame tests. This instrument boasts a high radiant flux, achieving a 100 Hz spectral measurement frequency, 4 cm −1 spectral resolution, and a 2–15 μm spectral coverage range.