Measurement System and Error Analysis of Mid-Infrared Atmospheric Background Radiation

Shuangyuan Chen; Fangyu Xu; Feixiang Wang; Xiaowei Yuan; Zhiyuan Luo; Ji Chen; Yongfang Luo

doi:10.3788/AOS201939.0301001

Acta Optica Sinica, Volume. 39, Issue 3, 0301001(2019)

Measurement System and Error Analysis of Mid-Infrared Atmospheric Background Radiation

Shuangyuan Chen^1,2, Fangyu Xu^1、*, Feixiang Wang³, Xiaowei Yuan^1,2, Zhiyuan Luo^1,2, Ji Chen⁴, and Yongfang Luo⁴

¹ Astronomical Opto-Electronic Laboratory, Yunnan Observatories, Chinese Academy of Sciences, Kunming, Yunnan 650216, China

² University of Chinese Academy of Sciences, Beijing 100049, China

³ College of Physics and Electronic Information, Yunnan Normal University, Kunming, Yunnan 650504, China

⁴ Yunnan KIRO-CH Photonics Co., Ltd., Kunming, Yunnan 650217, China

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Figures & Tables(11)

Fig. 1. Structural design drawing of refrigeration module in telescope

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Fig. 2. Time-domain distribution of samples

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Fig. 3. (a) Ambient temperature data and (b) temperature difference measured at Huairou observatory

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Fig. 4. Time sequences of atmospheric background radiation intensity in three astronomical observatories

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Fig. 5. Time sequence of atmospheric background radiation intensity in Delingha observatory

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Table 1. Parameters of mid-infrared detector
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Table 1. Parameters of mid-infrared detector
Detector type Wavelength range /μm Pixel number /(pixel×pixel) Pixel size /(10^-5 m) Cooling means Noise equivalent temperature difference /℃
HgCdTe 3.7-4.8 320×256 3×10⁵ Stirling refrigeration 0.01

Table 2. Characteristic parameters of common temperature blackbody
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Table 2. Characteristic parameters of common temperature blackbody
Parameter Temperature range /℃ Emissivity Temperature stability /℃ Temperature inhomogeneity /℃ Temperature accuracy /℃ Effective radiation area /cm²
Value 0-125 0.97±0.02 ±0.003 ±0.01 ±0.008 400

Table 3. Relative error resulting from temperature control precision of blackbody
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Table 3. Relative error resulting from temperature control precision of blackbody
Temperature /℃ Integrated radiance /(10^-6 W·cm^-2·sr^-1) Relative error /%
-0.008 9.9944 -0.0330
0 9.9977 0
0.008 1.0001 0.0330

Table 4. Data acquisition errors

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Table 4. Data acquisition errors

Environmental temperature /℃	Target temperature /℃	Error /%	Environmental temperature /℃	Target temperature /℃	Error /%
	0	0.0163		0	0.0687
	5	0.0320		5	0.0304
-25.0	10	0.0260	15.0	10	0.0114
	15	0.0311		15	0.0073
	20	0.0378		20	0.0073
	0	0.0558		0	0.0542
	5	0.0511		5	0.0508
-10.0	10	0.0349	21.0	10	0.0192
	15	0.0366		15	0.0368
	20	0.0231		20	0.0075
	0	0.0672		0	0.0611
	5	0.0614		5	0.0586
5.0	10	0.0199	28.5	10	0.0172
	15	0.0256		15	0.0285
	20	0.0124		20	0.0118

Table 5. Data processing errors

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Table 5. Data processing errors

No.	Environmental temperature /℃	Verification temperature /℃	Verification value /(10^-5W·cm^-2·sr^-1)	Measurement value /(10^-5W·cm^-2·sr^-1)	Error /%
1	-40	17	1.9787	1.9328	2.3754
2	-40	18	2.0539	2.0042	2.4709
3	-40	19	2.1241	2.0781	2.2134
4	-40	21	2.2784	2.2322	2.0709
5	20	0	9.9978	0.9998	0.0008
6	20	8	1.3796	1.3770	0.1873
7	20	15	1.8011	1.7958	0.2987

Table 6. Estimation results of extrapolation errors

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Table 6. Estimation results of extrapolation errors

Means	Calibration temperature /℃	Verification temperature /℃	Verification value /(W·cm^-2·sr^-1)	Measurement value /(W·cm^-2·sr^-1)	Error /%
1	0-20	30	3.0440×10^-5	3.0690×10^-5	0.8154
		62.75	8.1801×10^-5	8.2513×10^-5	0.8631
2	62.75-82.75	82.75	1.3681×10^-4	1.3810×10^-4	0.9348
		0	9.9977×10^-6	1.1237×10^-5	12.397

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Shuangyuan Chen, Fangyu Xu, Feixiang Wang, Xiaowei Yuan, Zhiyuan Luo, Ji Chen, Yongfang Luo. Measurement System and Error Analysis of Mid-Infrared Atmospheric Background Radiation[J]. Acta Optica Sinica, 2019, 39(3): 0301001

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