Influence of Non-uniformity of Light Attenuated by Solar Attenuation Screen on On-board Calibration

Wenxin Huang; Liming Zhang; Xiaolong Si; Hongyao Chen; Jun Hao; Shiwei Bao; Baoyun Yang; Jixiang Wang

doi:10.3788/AOS202040.0429002

Journals >Acta Optica Sinica >Volume 40 >Issue 4 >Page 0429002 > Article

Acta Optica Sinica
Vol. 40, Issue 4, 0429002 (2020)

Influence of Non-uniformity of Light Attenuated by Solar Attenuation Screen on On-board Calibration

Wenxin Huang^*, Liming Zhang^**, Xiaolong Si, Hongyao Chen, Jun Hao, Shiwei Bao, Baoyun Yang, and Jixiang Wang

Author Affiliations

Key Laboratory of Optical Calibration and Characterization, Chinese Academy of Sciences, Hefei, Anhui 230031, China

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DOI: 10.3788/AOS202040.0429002 Cite this Article Set citation alerts

Wenxin Huang, Liming Zhang, Xiaolong Si, Hongyao Chen, Jun Hao, Shiwei Bao, Baoyun Yang, Jixiang Wang. Influence of Non-uniformity of Light Attenuated by Solar Attenuation Screen on On-board Calibration[J]. Acta Optica Sinica, 2020, 40(4): 0429002 Copy Citation Text

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Fig. 1. Calibration principle based on solar diffuser with solar attenuation screen

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Fig. 2. Measurement results of SAC pass aperture

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Fig. 3. Angular distribution of SAC transmittance

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Fig. 4. Ray tracing schematic of energy uniformity on focal plane

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Fig. 5. Test schematic of change trend verification of SD radiance-angle

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Fig. 6. Change trend of SD radiance-angle at 355 nm

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Wavelength /nm	Relative difference $\begin{matrix} {η_{1}}_{} \end{matrix}$ /[%/(°)]				Relative difference $\begin{matrix} {η_{2}}_{} \end{matrix}$ /[%/(°)]
Wavelength /nm	θ_SC=15°	θ_SC=17°	θ_SC=19°	θ_SC=21°	ϕ_SC=-13°	ϕ_SC=-17°	ϕ_SC=-21°	ϕ_SC=-25°	ϕ_SC=-29°	ϕ_SC=-33°
355	0.0676	0.0852	0.1076	0.1077	0.4157	0.2721	0.3451	0.3392	0.3018	0.3439
385	0.0757	0.0808	0.1058	0.1144	0.4373	0.3461	0.3140	0.3862	0.3213	0.3590
412	0.0791	0.0836	0.1101	0.1166	0.4635	0.4112	0.3240	0.4472	0.3451	0.3702
443	0.0737	0.0838	0.1057	0.1147	0.4600	0.4400	0.3414	0.4651	0.3690	0.3729
490	0.0668	0.0859	0.0915	0.1068	0.4392	0.4111	0.3758	0.4455	0.3502	0.3385
520	0.0726	0.0934	0.0883	0.1034	0.4056	0.3729	0.3882	0.3976	0.3315	0.2992
565	0.0657	0.0938	0.0814	0.0885	0.3626	0.2930	0.4006	0.3464	0.3164	0.2454
670	0.0777	0.0921	0.1010	0.0885	0.3399	0.2801	0.3869	0.3337	0.3018	0.2356
750	0.0656	0.0788	0.0843	0.0750	0.3270	0.2578	0.3679	0.3671	0.2937	0.2184
865	0.0376	0.0418	0.0712	0.0552	0.3364	0.2661	0.3784	0.3889	0.2960	0.2880

Table 1. Difference of SD radiance

Source	Uncertainty /%
SD BRDF measurement	1.2(UV)0.8(VN)
Transmittance distribution of SAC	0.54
SD radiance non-uniformity	0.4
SD cosine error of incidence	0.35
SD stability monitor	0.54
Degeneration of SD before launch	0.5
Solar spectral irradiance	1
Stray light and unknown factor	1
U	2.13(UV)1.94(VN)

Table 2. Uncertainty analysis of SD spectral radiance of SCS

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