Prelaunch Radiometric Characterization and Calibration for Long Wave Infrared Band of FY-4B GHI

Xiuju Li; Qi Cao; Shutian Zhou; Jing Qian; Baoyong Wang; Yaopu Zou; Jing Wang; Xia Shen; Changpei Han; Lizhi Wang; Yuxiang Zhou; Panpan Li

doi:10.3788/AOS221688

Acta Optica Sinica, Volume. 43, Issue 12, 1212005(2023)

Prelaunch Radiometric Characterization and Calibration for Long Wave Infrared Band of FY-4B GHI

Xiuju Li^1,2, Qi Cao^1,2, Shutian Zhou^1,2, Jing Qian^1,2, Baoyong Wang^1,2, Yaopu Zou^1,2, Jing Wang^3、**, Xia Shen^1,2、*, Changpei Han^1,2, Lizhi Wang^1,2, Yuxiang Zhou^1,2, and Panpan Li^1,2

Author Affiliations

¹Key Laboratory of Infrared Detection and Imaging Technology, Chinese Academy of Sciences, Shanghai 200083, China

²Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, China

³National Satellite Meteorological Centre, China Meteorological Administration, Beijing 100081, China

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Figures & Tables(18)

Fig. 1. Main optical layout diagram of GHI^[4]

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Fig. 2. Schematic diagram of prelaunch laboratory calibration device

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Fig. 3. Schematic diagram of remote sensing data obtained by scanning laboratory blackbody

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Fig. 4. Radiometric calibration curves of first, intermediate and last detector in line array. (a) Line array 1; (b) line array 2; (c) line array 3; (d) line array 4

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Fig. 5. Relationship between fixed pattern noise and radiance. (a) Line array 1; (b) line array 2; (c) line array 3; (d) line array 4

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Fig. 6. Schematic diagram of infrared focal plane array arrangement and best imaging detector selection

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Fig. 7. Two new line arrays. (a) New line array based on maximizing SNR; (b) new line array based on minimizing response signal FPN

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Fig. 8. Comparison of response signal FPN of two new line arrays

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Fig. 9. Relationship curve between radiance and brightness temperature

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Fig. 10. Detection sensitivity at temperature of 300 K. (a) New line array based on maximizing SNR; (b) new line array based on minimizing response signal FPN

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Fig. 11. Schematic diagram of validation of on-board blackbody reference standard

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Fig. 12. Fitting curves of relationship between true brightness temperature and nominal brightness temperature of on-board blackbody. (a) New line array based on maximizing SNR; (b) new line array based on minimizing response signal FPN

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Table 1. Main performance parameters of spectral bands of GHI

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Table 1. Main performance parameters of spectral bands of GHI

Band	Bandwidth /μm	IFOV /μrad	SNR	NETD	Dynamic range	Primary use
B01	0.450-0.750	7	300@100%		0-100%	Panchromatic，land surface，vegetation，stars
B02	0.445-0.495	14	200@100%		0-100%	Blue，small particle aerosol
B03	0.520-0.570	14	300@100%		0-100%	Green，aerosol
B04	0.620-0.670	14	300@100%		0-100%	Red，aerosol
B05	1.371-1.386	14	150@100%		0-100%	Cirrus cloud
B06	1.580-1.640	14	300@100%		0-100%	Low cloud/snow，water cloud/ice cloud recognition
B07	10.300-12.500	56		0.2 K@300 K	180-330 K	Cloud，land surface temperature

Table 2. Temperature and radiance of laboratory blackbody

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Table 2. Temperature and radiance of laboratory blackbody

Serial No.	Temperature /K	Radiance / （W·cm^-2·sr^-1·μm^-1）
1	179.851	5.3038 $\times$ 10^-5
2	184.472	6.3351 $\times$ 10^-5
3	189.253	7.5456 $\times$ 10^-5
4	194.224	8.9690 $\times$ 10^-5
5	199.066	1.0527 $\times$ 10^-4
6	208.888	1.4244 $\times$ 10^-4
7	219.004	1.8913 $\times$ 10^-4
8	233.935	2.7501 $\times$ 10^-4
9	249.589	3.8844 $\times$ 10^-4
10	264.824	5.2315 $\times$ 10^-4
11	278.475	6.6492 $\times$ 10^-4
12	290.539	8.0702 $\times$ 10^-4
13	295.159	8.6565 $\times$ 10^-4
14	300.279	9.3331 $\times$ 10^-4
15	314.389	1.1345 $\times$ 10^-3
16	330.094	1.3835 $\times$ 10^-3

Table 3. Radiometric calibration coefficients of first, intermediate and last detector in line array

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Table 3. Radiometric calibration coefficients of first, intermediate and last detector in line array

Line array No.	Detector No.	a / （W·cm^-2·sr^-1·μm^-1）	b / （W·cm^-2·sr^-1·μm^-1）	c / （W·cm^-2·sr^-1·μm^-1）	adjrsquare	rmse
1	001	-1.7641 $\times$ 10^-11	6.6946 $\times$ 10^-7	2.7764 $\times$ 10^-6	0.99999	1.2114 $\times$ 10^-3
	128	-1.1635 $\times$ 10^-11	6.4881 $\times$ 10^-7	2.0480 $\times$ 10^-6	0.99999	1.0898 $\times$ 10^-3
	256	-2.1534 $\times$ 10^-11	7.2884 $\times$ 10^-7	2.5243 $\times$ 10^-6	0.99999	1.2001 $\times$ 10^-3
2	001	-1.6018 $\times$ 10^-11	6.5251 $\times$ 10^-7	2.8364 $\times$ 10^-6	0.99999	1.1461 $\times$ 10^-3
	128	-1.3049 $\times$ 10^-11	6.6345 $\times$ 10^-7	2.0588 $\times$ 10^-6	0.99999	1.3667 $\times$ 10^-3
	256	-1.9475 $\times$ 10^-11	7.0662 $\times$ 10^-7	2.3772 $\times$ 10^-6	0.99999	1.0155 $\times$ 10^-3
3	001	-1.9640 $\times$ 10^-11	7.0470 $\times$ 10^-7	3.4054 $\times$ 10^-6	0.99998	1.7347 $\times$ 10^-3
	128	-1.4515 $\times$ 10^-11	6.7023 $\times$ 10^-7	1.9698 $\times$ 10^-6	0.99999	1.0144 $\times$ 10^-3
	256	-2.1621 $\times$ 10^-11	7.2901 $\times$ 10^-7	1.7858 $\times$ 10^-6	0.99999	1.3148 $\times$ 10^-3
4	001	-1.8531 $\times$ 10^-11	6.8758 $\times$ 10^-7	2.9306 $\times$ 10^-6	0.99999	1.2538 $\times$ 10^-3
	128	-1.4150 $\times$ 10^-11	6.6644 $\times$ 10^-7	1.6627 $\times$ 10^-6	1.00000	7.9752 $\times$ 10^-4
	256	-2.3346 $\times$ 10^-11	7.5504 $\times$ 10^-7	2.4607 $\times$ 10^-6	0.99999	1.1148 $\times$ 10^-3

Table 4. Verification of laboratory radiometric calibration results at temperature of 300 K

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Table 4. Verification of laboratory radiometric calibration results at temperature of 300 K

Line array No.	Relative deviation e_RD /%			Brightness temperature deviation /K
Line array No.	minimum	maximum	average	minimum	maximum	average
1	-0.238	0.331	0.042	-0.164	0.228	0.029
2	-0.084	0.285	0.049	-0.058	0.196	0.034
3	-0.161	0.211	0.035	-0.111	0.145	0.024
4	-0.067	0.152	0.047	-0.046	0.105	0.033

Table 5. Uncertainty analysis of laboratory radiometric calibration at temperature of 300 K

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Table 5. Uncertainty analysis of laboratory radiometric calibration at temperature of 300 K

Error source	Uncertainty /K
Expanded uncertainty（k=2）	0.670
Measurement uncertainty of blackbody spectral emissivity（k=1）	0.104
Temperature measurement uncertainty of platinum resistance sensor（k=1）	0.050
Stability of blackbody temperature（k=1）	0.040
Nonuniformity of blackbody temperature（k=1）	0.200
Fitting residual error of GHI radiometric response model（k=1）	0.230
Influence of GHI temporal noise（k=1）	0.060
Influence of GHI spatial noise（k=1）	0.028

Table 6. Fitting coefficients of relationship between true brightness temperature and nominal brightness temperature of on-board blackbody

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Table 6. Fitting coefficients of relationship between true brightness temperature and nominal brightness temperature of on-board blackbody

New line array	Detector No.	k₀	k₁ /K	adjrsquare	rmse
Based on maximizing SNR	1	0.9959	1.6543	0.99993	0.0679
	128	0.9973	1.2101	0.99991	0.0750
	256	1.0010	0.0790	0.99997	0.0463
Based on minimizing response signal FPN	1	0.9959	1.6543	0.99993	0.0679
	128	0.9990	0.7154	0.99997	0.0418
	256	1.0010	0.0790	0.99997	0.0463

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Xiuju Li, Qi Cao, Shutian Zhou, Jing Qian, Baoyong Wang, Yaopu Zou, Jing Wang, Xia Shen, Changpei Han, Lizhi Wang, Yuxiang Zhou, Panpan Li. Prelaunch Radiometric Characterization and Calibration for Long Wave Infrared Band of FY-4B GHI[J]. Acta Optica Sinica, 2023, 43(12): 1212005

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Paper Information

Category: Instrumentation, Measurement and Metrology

Received: Sep. 7, 2022

Accepted: Dec. 7, 2022

Published Online: Jun. 20, 2023

The Author Email: Wang Jing (wjing@cma.gov.cn), Shen Xia (shenxia@mail.sitp.ac.cn)

DOI:10.3788/AOS221688

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology