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零级漂移存在于时空联合调制型紫外傅里叶变换成像光谱仪干涉图中。对干涉结构中分束体光路的计算表明,分束体中的光学胶和棱镜在紫外波长范围内的折射率变化会导致零级漂移。但是棱镜装配错位会使零级漂移更为严重,导致有效干涉信息丢失及反演光谱曲线失真。数值仿真结果表明,提高分束体装配精度,可避免有效干涉信息的丢失。实际测量结果表明,含固有零级漂移的时空联合调制型干涉成像光谱仪的反演光谱曲线与高分辨率光谱仪测量数据一致。当分束体装配精度较高时,零级漂移不会影响成像光谱仪测量的准确性。
Zero-order drift exists in the space-time co-modulated ultraviolet Fourier transform imaging spectrometer interferogram. The calculation of the optical path of the splitting body in the interference structure shows that the refractive index change of the optical glue and the prism in the splitting body in the UV wavelength range will lead to zero-order drift. However, the prism assembly misalignment will make zero order drift more serious, resulting in loss of effective interference information and inversion of the spectral curve distortion. Numerical simulation results show that to improve the assembly accuracy of the beam splitter can avoid the loss of effective interference information. The actual measurement results show that the inversion spectral curve of space-time combined modulation interferometric imaging spectrometer with inherent zero-order drift is consistent with the measurement data of high-resolution spectrometer. Zero-order drift does not affect the accuracy of imaging spectrometer measurements when the beam splitter assembly accuracy is high.