Cao Jun, Yuan Yan, Su Lijuan, Zhu Conghui, Yan Qiangqiang
Key Laboratory of Precision Opto-mechatronics Technology Sponsored by Ministry of Education, School of Instrumentation Science and Opto-electronics Engineering, Beihang University, Beijing 100191, China.
Key Laboratory of Spectral Imaging Technology of Chinese Academy of Sciences, Xi'an 710119, China.
Sensors (Basel). 2020 Feb 21;20(4):1195. doi: 10.3390/s20041195.
Temporally-spatially modulated Fourier transform imaging spectrometers (TSMFTISs) provide high-throughout-type push-broom spectrometry with both temporal and spatial modulation features. The system requires strict registration between the detector and the interferogram. However, registration errors are unavoidable and directly change the corresponding optical path difference values of the interferogram. As a result, the interferogram should be corrected before restoring the spectrum. In order to obtain the correct optical path difference (OPD) values, an online registration error correction method based on robust least-square linear fitting is presented. The model of the registration error was constructed to analyze its effect on the reconstructed spectra. Fitting methods were used to obtain correct optical path difference information. Simulations based on the proposed method were performed to determine the influence of the registration error on the restored spectra and the effectiveness of the proposed correction method. The simulation results prove that the accuracy of the recovered spectrum can be improved after correcting the interferogram deviation caused by the registration error. The experimental data were also corrected using the proposed methods.
时空调制傅里叶变换成像光谱仪（TSMFTIS）提供了具有时间和空间调制特性的高通量型推扫式光谱测量。该系统要求探测器和干涉图之间进行严格配准。然而，配准误差是不可避免的，并且会直接改变干涉图相应的光程差值。因此，在恢复光谱之前应对干涉图进行校正。为了获得正确的光程差（OPD）值，提出了一种基于稳健最小二乘线性拟合的在线配准误差校正方法。构建了配准误差模型以分析其对重建光谱的影响。采用拟合方法来获取正确的光程差信息。基于所提出的方法进行了仿真，以确定配准误差对恢复光谱的影响以及所提出校正方法的有效性。仿真结果证明，在校正由配准误差引起的干涉图偏差之后，可以提高恢复光谱的精度。实验数据也使用所提出的方法进行了校正。
