KEYWORDS: Spectroscopy, Interferometry, Data modeling, Signal to noise ratio, Interference (communication), Sensors, Data acquisition, Black bodies, Statistical modeling, Fringe analysis
Many sources of spectrometer system noise are introduced, which will be superimposed on the interference data. In this paper, the statistical properties of noise are analyzed, and Gaussian models are established by extracting features from the actual collected interferometric data. For 30-degree and 35-degree target radiation sources, the same sets of interferometric data are collected, and the histogram of noise is established and the curve is fitted to match the corresponding Gaussian model. The ideal interference fringe is simulated for the studied spectrometer object, and the effect of Gaussian noise on the interference fringe is analyzed, and the experiments prove that the effect of the noise-added interference fringe is close to that of the measured interference fringe.
KEYWORDS: Mirrors, Interferometers, Signal detection, Spectroscopy, FT-IR spectroscopy, Control systems, Michelson interferometers, Infrared spectroscopy, Control systems design, Computer programming
Michelson interferometer is one of the core technologies of time-modulated Fourier transform infrared spectrometer. And the control effect of the interferometer moving mirror has a very important influence on the instrument performance. In this paper, based on the double pendulum interferometer, the control technology of its moving mirror is studied. According to the basic principle of double pendulum interferometer, the general scheme of hardware system design is proposed. And under the guidance of the overall scheme, the modular design of the control system is carried out. There are mainly laser detection modules, main control module, motor drive module, etc. The moving mirror control algorithm is designed in the lower computer software, and the speed of the moving mirror is controlled using the compound control algorithm formed by the combination of incremental PID control and feed-forward control. The control effect of the moving mirror is improved. The upper computer software uses LabVIEW to design and test the control effect of the control system. The test results show that the relative speed error of the moving mirror based on the double pendulum interferometer is better than ±0.35%, and the stability is high, which can meet the requirements of the interference system index.
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