短波红外波段上辐射定标方法与整层大气透过率的测量研究

王书; 连文涛; 孙振; 胡涛

doi:10.11884/HPLPB202436.240333

短波红外波段上辐射定标方法与整层大气透过率的测量研究

doi: 10.11884/HPLPB202436.240333

王书^1,,
连文涛^{2, 3, 4, 5, ,},
孙振^{2, 3, 4},
胡涛¹

1.
信息工程大学数据与目标工程学院，郑州 450001
2.
中国科学院安徽光学精密机械研究所大气光学重点实验室，合肥 230031
3.
中国科技大学，合肥 230031
4.
安徽省先进激光技术实验室，合肥 230037
5.
中国科技大学环境科学与光电技术学院，合肥 230026

详细信息

作者简介:
王　书，shu1008@mail.ustc.edu.cn

通讯作者:
连文涛，lwentao@mail.ustc.edu.cn。

中图分类号: P40；O43
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- 文章访问数: 101
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- PDF下载量: 8
- 被引次数: 0
出版历程
- 收稿日期: 2024-09-16
- 修回日期: 2024-10-20
- 录用日期: 2024-10-20
- 网络出版日期: 2024-11-02
- 刊出日期: 2024-11-08

Research on radiometric calibration method and measurement of whole layer atmospheric transmittance in short wave infrared band

Wang Shu^1
,,
Lian Wentao^{2, 3, 4, 5
, ,},
Sun Zhen^{2, 3, 4},
Hu Tao¹

1.
Information Engineering University, Zhengzhou 450001, China
2.
Key Laboratory of Atmospheric Optics, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China
3.
University of Science and Technology of China, Hefei 230031, China
4.
Advanced Laser Technology Laboratory of Anhui Province, Hefei 230037, China
5.
School of Environmental Science and Optoelectronic Technology, University of Science and Technology of China, Hefei 230026, China

摘要

摘要: 利用傅里叶红外光谱仪开展了短波红外波段上辐射定标方法和连续整层大气透过率的测量研究。由于在短波红外波段（0.9～2.2 μm）上存在多个强吸收波段，导致常用的Langley法存在较大误差，且改进的Langley法对于强吸收波段的定标处理也无法得到较好的结果。为满足短波红外全波段上整层大气透过率的高精度测量要求，提出了一种改进的大气透过率计算方法，先利用Langley定标法得到非吸收波段的仪器定标值和响应函数K再结合仪器定标值与大气顶层太阳辐照度的关系确定仪器定标值，得到短波红外全波段上整层大气透过率。利用该方法得到的0.9～2.2 μm波段上整层连续大气透过率的结果，与中等分辨率大气辐射传输计算模型软件CART计算结果对比，相对误差最大为6.3%，平均误差小于2.5%。
- 大气透过率 /
- 傅里叶红外光谱仪 /
- 短波红外 /
- 定标法
Abstract: This article employs Fourier transform infrared spectroscopy to investigate radiometric calibration methods and the measurement of continuous atmospheric transmittance across the shortwave infrared band. The presence of multiple strong absorption bands within the shortwave infrared spectrum (0.9−2.2 μm) leads to significant errors in the commonly used Langley method, and even the improved Langley method struggles to yield accurate results for the calibration of these strong absorption bands. To fulfill the high-precision measurement demands for atmospheric transmittance across the entire shortwave infrared band, this paper introduces an enhanced method for calculating atmospheric transmittance. Initially, the Langley calibration technique is utilized to determine the instrument calibration value and response function K in the non-absorption band. Subsequently, the instrument response function in the absorption band is derived by interpolating the wavelength based on the instrument response function calibrated in the non-absorption band. Ultimately, the instrument calibration value is established by correlating it with the solar irradiance at the atmosphere’s top, thereby obtaining the atmospheric transmittance across the entire shortwave infrared band. Compared to results calculated by the medium-resolution atmospheric radiative transfer model software CART, the atmospheric transmittance values obtained using this method within the 0.9−2.2 μm band exhibit an average error of less than 2.5%.
- atmospheric transmittance /
- Fourier infrared spectrometer /
- short-wave infrared /
- calibration method

HTML全文

图 1 EM27/SUN测量的原始数据

Figure 1. Raw data measured by EM27/SUN

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图 2 选定8个波段Langley法拟合图

Figure 2. Selected 8 bands fitted with Langley method

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图 3 非吸收波段Langley法定标结果

Figure 3. Non absorption band Langley standard results

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图 4 大气顶层太阳辐照度

Figure 4. Solar irradiance in top of atmosphere

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图 5 仪器响应函数

Figure 5. Instrumental response function

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图 6 改进的定标法处理后的定标值

Figure 6. The calibration value after the improved calibration method

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图 7 不同时刻大气整层透过率

Figure 7. Transmittance of the entire atmosphere at different times

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图 8 不同时刻(天顶角)下计算的透过率与相应天顶角下CART模拟透过率的对比

Figure 8. Comparison of calculated transmittance at different time points (zenith angles) with CART simulated transmittance at corresponding zenith angles

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图 9 计算结果与CART模拟结果对比

Figure 9. Comparison between calculation results and CART simulation results

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表 1 EM27/SUN 参数

Table 1. EM27/SUN parameters

instrument	insititude	spectral range/cm⁻¹	resolution/cm⁻¹	measurement time/min	sample scans
Bruker EM27/SUN	KIT	4000～9000	0.5	1	10

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表 2 选定8个波段Langley法定标结果

Table 2. Selected 8 bands’ Langley calibration results

No.	band/μm	slope	intercept	correlation coefficient
1	0.86	−0.194	−4.837	−0.99063
2	0.88	−0.207	−4.381	−0.99063
3	1.01	−0.219	−3.566	−0.99063
4	1.05	−0.169	−3.404	−0.99063
5	1.08	−0.179	−3.266	−0.99063
6	1.22	−0.193	−2.676	−0.99063
7	1.29	−0.218	−2.655	−0.99063
8	1.65	−0.118	−2.392	−0.99637

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