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摘要:
空间外差光谱技术(SHS)作为一种新型超光谱分辨率的光谱分析技术近年来得到了快速发展和广泛应用。根据SHS的基本结构和原理，本文对SHS应用系统中能对干涉图产生影响的各种干扰和畸变进行了分析，并针对这些干扰提出了一种SHS干涉图校正方案。实验结果表明，该方案不仅可以对干涉图进行有效校正，而且复原光谱能够良好地反映输入光谱信息，提高SHS的反演精度。
Abstract:Spatial heterodyne spectroscopy (SHS) has been rapidly developed and widely used in recent years as a new type of super-spectral resolution of spectrum analysis technology. According to the structure and principles of SHS, various kinds of interference and distortion of SHS application system which influence the interferogram are analyzed in this paper and a correction scheme of SHS interferogram for the suppression of the interference is proposed. Experimental results show that the proposed method can correct the interferogram effectively, and make the recovered spectrum reflect the input spectral information well and improve the inversion accuracy of the SHS.
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Abstract: Spatial heterodyne spectroscopy (SHS) is a new spectral analysis technique for super-spectral resolution which is developed rapidly and used widely. At present, common applications include atmospheric microelement detection, atmospheric water vapor detection, laboratory astrophysics observation and other weak target identification. However, in practical applications, there are distortions of the collected interferogram which affect the detection accuracy of the system because of bad splitting effect of beam splitter, contaminated grating surface, unbalanced interferometer arms, uneven detector response spectrum, electronic circuit error, the dust in the test environment, test platform instability and other factors. Therefore, the noise removal and interference suppression of the interferogram generated by spatial heterodyne spectroscopy are one of the hot issues in the current academic research. Basic structure and principle of SHS were analyzed in detail and the interference and distortion of SHS application system which could influence the interferogram were analyzed and a correction scheme of SHS interferogram with strong robustness was proposed according to the existing interferogram processing scheme. The correction scheme includes noise suppression, baseline removal, flatness correction, apodization, phase correction and so on. Then, the SHS experimental platform was constructed by using helium-neon laser and sodium lamp respectively and the collected interferogram was analyzed by the scheme mentioned above. Finally, compared the two restoration spectrums got by the original interferogram and the correction interferogram respectively, it is found that the proposed scheme can not only effectively eliminate the interference information in the interferogram, but also reflect the input spectral information well and improve the inversion accuracy of the SHS system (The resolution limit error of the experimental platform 1 is 0.0004 mm-1 and the resolution limit error of the experimental platform 2 is 0.016 mm-1, indicating that the actual resolution of the platform has good agreement with the theoretical resolution). The effectiveness and superiority of the scheme are verified. In addition, the proposed correction scheme for interferogram does not impose additional requirements on the application environment and equipment of the system so the scheme has high universality and provides some support for SHS research.
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图 6 平台2降噪数据. (a)降噪干涉图. (b)降噪复原光谱.
Figure 6. Denoising data of platform 2. (a) Interferogram of denoising. (b) Recovered spectrum of denoising.
图 7 平台2平坦度校正数据. (a)平坦度校正干涉图. (b)平坦度校正复原光谱.
Figure 7. Flatfielding correction data of platform 2. (a) Interferogram of flatfielding correction. (b) Recovered spectrum of flatfielding correction.
图 8 平台2基线去除数据. (a)基线去除干涉图. (b)基线去除复原光谱.
Figure 8. Removing baseline data of platform 2. (a) Interferogram of removing baseline. (b) Recovered spectrum of removing baseline.
图 9 平台2切趾数据. (a)切趾干涉图. (b)切趾复原光谱.
Figure 9. Apodization data of platform 2. (a) Interferogram of apodization. (b) Recovered spectrum of apodization.
图 10 平台1原始数据. (a)原始干涉图. (b)原始复原光谱.
Figure 10. Original data of platform 1. (a) Original interferogram. (b) Original recovered spectrum.
图 11 平台1校正数据. (a)校正干涉图. (b)校正复原光谱.
Figure 11. Corrected data of platform 1. (a) Corrected Interferogram. (b) Corrected recovered spectrum.
图 12 平台2原始数据. (a)原始干涉图. (b)原始复原光谱.
Figure 12. Original data of platform 2. (a) Original interferogram. (b) Original recovered spectrum
图 13 钠灯干涉图校正. (a)相位校正后的干涉图. (b)复原光谱.
Figure 13. Interferogram processing of sodium lamp. (a) Phase corrected interferogram. (b) Recovered spectrum.
表 1 实验平台1/2的相关性能参数.
Table 1. Relevant performance parameters of the experimental platform 1/2.
参数 实验平台1 实验平台2 光源 氦氖激光器
(632.8 nm)钠光灯
(589/589.6 nm)Littrow波长/nm 631 589.7 Littrow角/(°) 22.25 20.72 分辨极限/mm-1 0.1499 0.1605 分辨能力 10596 10596 光谱范围/mm-1 76.7488 82.1760 
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