大孔径静态干涉成像光谱仪光谱信噪比研究
发布时间：2018-12-09 07:55
【摘要】：大孔径静态干涉成像光谱仪获取图谱数据立方体的过程包含干涉仪调制、探测器矩形函数卷积采样和光谱反演,其光谱信噪比评估模型复杂。从光谱能量调制、采样、反演的完整传输过程入手,根据探测器矩形卷积采样原理,采用离散傅里叶变换取实部的光谱反演方法,进行信号与噪声的理论推导,建立了大孔径静态干涉成像光谱仪光谱信噪比评估模型。考虑了与波数相关的光学系统透过率、干涉仪分束面效率、探测器量子效率等仪器设计参数和主要电路噪声参数,进行了光谱信噪比仿真计算。利用LASIS仪器进行了光谱信噪比实验测试,测试结果与模型仿真计算结果平均偏差为3.58%,单谱段信噪比趋势基本吻合,验证了评估模型的正确性。评估模型中包含了典型LASIS成像光谱仪由输入光谱辐射到输出光谱数据的各项主要技术环节,在信噪比计算公式中带入干涉仪分束面干涉效率、探测器矩形采样方式等因素对仪器光谱信噪比的影响算子,并利用实际仪器进行了实验验证,对提高LASIS成像光谱仪工程设计水平具有指导意义。
[Abstract]:The acquisition of spectral data cube by large aperture static interference imaging spectrometer includes interferometer modulation, detector rectangular function convolution sampling and spectral inversion, and its spectral signal-to-noise ratio evaluation model is complex. Starting with the complete transmission process of spectral energy modulation, sampling and inversion, according to the principle of detector rectangular convolution sampling, the spectral inversion method of discrete Fourier transform (DFT) is used to derive the theory of signal and noise. A spectral signal-to-noise ratio (SNR) evaluation model of large aperture static interferometric spectrometer is established. The optical system transmittance, beam splitting efficiency of interferometer, detector quantum efficiency and the main circuit noise parameters are considered, and the spectral signal-to-noise ratio is simulated. The experimental results of spectral signal-to-noise ratio (SNR) are tested by using LASIS instrument. The average deviation between the measured results and the simulation results is 3.58, and the SNR trend of the single spectral band is basically consistent, which verifies the correctness of the evaluation model. The evaluation model includes the main technical links of the typical LASIS imaging spectrometer from the input spectrum radiation to the output spectral data. The interference efficiency of the interferometer beam-splitting surface is brought into the calculation formula of the signal-to-noise ratio (SNR). The influence of the detector rectangular sampling method on the signal-to-noise ratio (SNR) of the spectrometer is verified by experiments, which is helpful to improve the engineering design level of the LASIS imaging spectrometer.
【作者单位】： 中国科学院西安光学精密机械研究所光谱成像技术重点实验室;中国科学院大学;中国科学院光电技术研究院;
【基金】：国家自然科学基金项目(41005109) 中国科学院空间科学先导专项(XDA04072102)资助
【分类号】：TH744.1
[Abstract]:The acquisition of spectral data cube by large aperture static interference imaging spectrometer includes interferometer modulation, detector rectangular function convolution sampling and spectral inversion, and its spectral signal-to-noise ratio evaluation model is complex. Starting with the complete transmission process of spectral energy modulation, sampling and inversion, according to the principle of detector rectangular convolution sampling, the spectral inversion method of discrete Fourier transform (DFT) is used to derive the theory of signal and noise. A spectral signal-to-noise ratio (SNR) evaluation model of large aperture static interferometric spectrometer is established. The optical system transmittance, beam splitting efficiency of interferometer, detector quantum efficiency and the main circuit noise parameters are considered, and the spectral signal-to-noise ratio is simulated. The experimental results of spectral signal-to-noise ratio (SNR) are tested by using LASIS instrument. The average deviation between the measured results and the simulation results is 3.58, and the SNR trend of the single spectral band is basically consistent, which verifies the correctness of the evaluation model. The evaluation model includes the main technical links of the typical LASIS imaging spectrometer from the input spectrum radiation to the output spectral data. The interference efficiency of the interferometer beam-splitting surface is brought into the calculation formula of the signal-to-noise ratio (SNR). The influence of the detector rectangular sampling method on the signal-to-noise ratio (SNR) of the spectrometer is verified by experiments, which is helpful to improve the engineering design level of the LASIS imaging spectrometer.
【作者单位】： 中国科学院西安光学精密机械研究所光谱成像技术重点实验室;中国科学院大学;中国科学院光电技术研究院;
【基金】：国家自然科学基金项目(41005109) 中国科学院空间科学先导专项(XDA04072102)资助
【分类号】：TH744.1
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