Department of Aeronautic Electricity, Hanseo University, 46, Hanseo 1-ro, Seosan-si 31962, Republic of Korea.
Satellite Research Directorate, Korea Aerospace Research Institute, 169-82, Gwahak-ro, Daejeon 34133, Republic of Korea.
Sensors (Basel). 2023 Feb 27;23(5):2603. doi: 10.3390/s23052603.
A static modulated Fourier transform spectrometer has been noted to be a compact and fast evaluation tool for spectroscopic inspection, and many novel structures have been reported to support its performance. However, it still suffers from poor spectral resolution due to the limited sampling data points, which marks its intrinsic drawback. In this paper, we outline the enhanced performance of a static modulated Fourier transform spectrometer with a spectral reconstruction method that can compensate for the insufficient data points. An enhanced spectrum can be reconstructed by applying a linear regression method to a measured interferogram. We obtain the transfer function of a spectrometer by analyzing what interferogram can be detected with different values of parameters such as focal length of the Fourier lens, mirror displacement, and wavenumber range, instead of direct measurement of the transfer function. Additionally, the optimal experimental conditions for the narrowest spectral width are investigated. Application of the spectral reconstruction method achieves an improved spectral resolution from 74 cm when spectral reconstruction is not applied to 8.9 cm, and a narrowed spectral width from 414 cm to 371 cm, which are close to the values of the spectral reference. In conclusion, the spectral reconstruction method in a compact static modulated Fourier transform spectrometer effectively enhances its performance without any additional optic in the structure.
静态调制傅里叶变换光谱仪已被证明是一种用于光谱检测的紧凑且快速的评估工具，许多新型结构已被报道可用于提高其性能。然而，由于采样数据点有限，其光谱分辨率仍然较差，这是其固有的缺点。在本文中，我们概述了一种通过光谱重建方法增强静态调制傅里叶变换光谱仪性能的方法，该方法可以补偿数据点的不足。通过对测量的干涉图应用线性回归方法，可以重建增强的光谱。我们通过分析可以用傅里叶透镜焦距、镜面位移和波数范围等不同参数检测到的干涉图来获得光谱仪的传递函数，而不是直接测量传递函数。此外，还研究了获得最窄光谱宽度的最佳实验条件。应用光谱重建方法可将光谱分辨率从未应用光谱重建时的 74cm 提高到 8.9cm，并将光谱宽度从 414cm 缩小到 371cm，接近光谱参考值。总之，在紧凑的静态调制傅里叶变换光谱仪中应用光谱重建方法可以有效地提高其性能，而无需在结构中增加任何额外的光学元件。
