基于中阶梯光栅的波长定标方法研究

毛靖华; 王咏梅; 石恩涛; 张仲谋; 江芳

doi:10.3788/CO.20171003.0376

基于中阶梯光栅的波长定标方法研究

doi: 10.3788/CO.20171003.0376

毛靖华^{1, 2,},
王咏梅^1, ,,
石恩涛¹,
张仲谋¹,
江芳¹

1.
中国科学院国家空间科学中心, 北京 100190
2.
中国科学院大学, 北京 100190

基金项目:

国家自然科学基金资助项目 41005013

详细信息

作者简介:
毛靖华(1990-), 女, 河南驻马店人, 博士, 主要从事星载光学仪器地面定标方面的研究。E-mail:renne1230@126.com

王咏梅(1967—)，女，贵州人，博士，研究员，主要从事中高层大气、电离层光学遥感仪器研制和数据应用方面的研究。E-mail:wym@nssc.ac.cn

通讯作者:
王咏梅, E-mail:wym@nssc.ac.cn

中图分类号: TG502.33;TH744
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出版历程
- 收稿日期: 2017-01-12
- 修回日期: 2017-03-28
- 刊出日期: 2017-06-01

Spectral calibration based on echelle

1.
National Space Science Center, Beijing 100190, China
2.
University of Chinese Academy of Sciences, Beijing 100190, China

Funds:

National Natural Science Foundation of China 41005013

摘要

摘要: 波长定标是仪器遥感数据定量化的前提和基础。针对星载大气微量成分探测仪视场大、波长宽、空间分辨率和波长分辨率高的特点，建立了基于中阶梯衍射光栅的波长定标装置。中阶梯光栅因其较少的线密度和较大的闪耀角工作在较高的闪耀级次，光谱范围宽且具有较高的分辨率，可在工作波段内一次性输出多条分布较为均匀的谱线，克服了传统定标方式的缺点，提高了定标精度。本文首先介绍了波长定标装置的工作原理，接着利用该装置对高光谱大气微量成份探测仪进行波长定标，通过寻峰和回归分析给出载荷的波长定标方程，并利用标准汞灯谱线对定标结果进行检验。结果表明：高光谱大气微量成份探测仪的像元和波长近似满足线性分布规律，定标不确定度为0.025 8 nm，汞灯特征谱线的定标值和标准值偏差最大不超过0.043 5 nm，证明了定标结果的准确性。
- 波长定标 /
- 中阶梯光栅 /
- 星载大气微量成分探测仪 /
- 光栅衍射方程
Abstract: Spectral calibration is the premise of remote sensing data inversion. Considering the advantages of a large field, wide wavelength range, high spatial and spectral resolution, the spectral calibration equipment based on echelle is built. Working at a higher blazed order with a large blaze angle, the echelle is characterized by a wide spectrum range and high spectral resolution. It can output multiple spectral lines with uniform distribution in the detection band, which overcomes the shortcomings of the traditional calibration methods and improves the calibration accuracy. In our study, the working principle of the spectral calibration equipment is given first. Then using this equipment, the spectral calibration equation of the hyperspectral imaging spectrometer is given accurately by peak-searching and regression analysis. Finally, the calibration results are verified by using the unique characteristics of mercury spectral lines. The experiment results show that there is a approximate linear distribution between pixel and wavelength. The uncertainty of the wavelength calibration is 0.025 8 nm, and the maximum deviation of calibration values and standard deviation values of mercury spectral lines is less than 0.043 5 nm, which can prove the accuracy of the calibration results.
- spectral calibration /
- echelle grating /
- hyperspectral imaging spectrometer /
- grating equation

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图 1 波长定标装置结构图

Figure 1. Structural diagram of spectral calibration equipment

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图 2 波长定标装置输出的光谱图

Figure 2. Spectrum of the calibration equipment

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图 3 实验装置示意图

Figure 3. Schematic diagram of spectral calibration experiment

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图 4 462.46 nm的像元和响应关系图

Figure 4. Pixels signal at the wavelength of 462.46 nm

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图 5 星载大气微量成分探测仪在中心视场的回归直线

Figure 5. Regression line in center area of FOV obtained by hyperspectral imaging spectrometer

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图 6 回归直线残差图

Figure 6. Residual plot of the regression line

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图 7 校验装置图

Figure 7. Schematic diagram of calibration equipment

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表 1 L2479的主要辐射特性

Table 1. Radiation characteristic of L2479

型号	功率/W	弧长/mm	光强μW/cm².nm@50 cm λ 440 nm
L2479	300	3.0	5.06

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表 2 定标装置的中心波长及分辨率

Table 2. Central wavelength and spectral resolution of the equipment

衍射级次	中心波长/nm	光谱分辨率/nm
64	375.798 38	0.045 321 30
63	381.749 51	0.048 817 80
62	387.895 80	0.049 600 35
61	394.273 75	0.049 250 70
60	400.854 40	0.049 650 30
59	407.637 76	0.049 716 90
58	414.654 17	0.049 567 05
57	421.945 58	0.050 366 25
56	429.456 20	0.053 846 10
55	437.251 77	0.050 932 35
54	445.359 62	0.055 927 35
53	453.745 17	0.053 246 70
52	462.462 39	0.057 459 15
51	471.542 92	0.056 809 80
50	480.961 76	0.056 443 50
49	490.780 22	0.057 559 05
48	500.994 20	0.058 424 85

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表 3 波长定标不确定度分析

Table 3. Uncertainty analysis of spectral calibration

σ₁/nm	σ₂/nm	σ₃/nm	σ/nm
0.01	0.017 2	0.016 5	0.025 84

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表 4 定标波长与标准波长的对比

Table 4. Comparison of the calculated value and standard values

标准波长/nm	定标波长/nm	偏差绝对值/nm
435.833 5	435.794 8	0.038 7
407.783 7	407.774 9	0.008 7
404.656 5	404.613 0	0.043 5

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