Design Of Sagnac Interferometric Fourier Transform Spectrometer And Study On Some Key Issues

Fourier transform spectrometer is an important branch of spectroscopic instruments.It has many advantages such as high spectral precision and large luminous flux.Fourier transform spectrometer has important applications in material identification,aerial remote sensing and atmospheric environment monitoring.Sagnac interferometer is an important type in static Fourier transform spectrometer.Studying the structural design,spectral recovery process and key performance parameters of the Sagnac interferometric Fourier transform spectrometer is of great significance for further improving the measuring accuracy of the spectrometer,reducing errors and improving the spectral recovery accuracy.Spectral accuracy has important implications.In the actual application process of Sagnac interference Fourier transform spectrometer,there are problems such as low spectral reconstruction accuracy,large wave number error,and spectral intensity distortion.Therefore,it is necessary to study these problems.Based on the analysis of the background principle of Fourier transform spectrometer,the system design of Sagnac interference Fourier transform spectrometer was carried out.The optical system design and spectral recovery process design of the spectrometer were carried out.The hardware parameters of the spectrometer were determined according to the technical indicators.And use MATLAB software to write relevant data processing code.According to the design scheme,the spectrometer was built and the spectral restoration and spectral calibration work were carried out.Experiments were carried out on different types of light sources,and the obtained restored spectra were analyzed and studied.The three key indicators of the resolution and signal-to-noise ratio of the spectrometer in the Fourier transform spectrometer system and the shear distance of the interferometer are studied in depth.The experimental results show that the designed spectrometer can recover the spectrum better and meet the design requirements.