Simulation and Experimental Measurement of Cryogenic Radiometer Cavity With Different Structures

Fig. 4. Measurment
(a): Stability of the laser power (70 min); (b): Stability of white standard signal U_S;(c): Stability of the cavity signal U_c; (d): Stability of the background signal U_B

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Fig. 5. Comparison of simulation results and measurement results of the cavity with different structures

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Table 1. The cavity parameters
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Table 1. The cavity parameters
No. Long/mm Thick/mm Weight/g Diameter/mm Inlet-Diameter/mm Angle
1^# 75 0.1 2 10 10 Cone-30°
2^# 75 0.1 2 10 10 Inclined-30°
3^# 75 0.1 2 10 10 Inclined-30°
4^# 75 0.1 2.2 12 8 Inclined-30°

Table 2. The absorptance of simulation parameter setup

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Table 2. The absorptance of simulation parameter setup

No.	Item	Parameter
1	Wave-length	632.8 nm
2	Laser Power	1 W
3	Light diameter	2 mm
4	追迹光线数量	119 401
5	追迹门槛设定	10^-7
6	涂层材料吸收率	0.94
7	涂层镜面反射系数	0.05
8	朗伯漫反射系数(ABg)	0.01

Table 3. The cavity parameters
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Table 3. The cavity parameters
No. 1^# 2^# 3^# 4^#
Absorptance 0.999 658 0.999 952 0.999 964 0.999 974

Table 4. Measurement results of cavity absorption coefficient

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Table 4. Measurement results of cavity absorption coefficient

No.	Item	White standard	Cavity	Background	Absorptance
1^#	Signal( $\overset{̅}{V}$ )	1.017 78	0.000 667 279	0.000 217 806	0.999 568±0.000 05
1^#	Std(V)	1.2×10^-4	6.4×10^-6	5.8×10^-6	0.999 568±0.000 05
2^#	Signal( $\overset{̅}{V}$ )	1.041 72	0.000 315 926	0.000 275 275	0.999 962±0.000 005
2^#	Std(V)	9.2×10^-5	7.5×10^-6	4.9×10^-6	0.999 962±0.000 005
3^#	Signal( $\overset{̅}{V}$ )	1.041 89	0.000 329 386	0.000 268 882	0.999 943±0.000 005
3^#	Std(V)	1.6×10^-4	7.2×10^-6	4.8×10^-6	0.999 943±0.000 005
4^#	Signal( $\overset{̅}{V}$ )	1.013 92	0.000 340 901	0.000 280 262	0.999 942±0.000 005
4^#	Std(V)	1.9×10^-4	6.9×10^-6	4.3×10^-6	0.999 942±0.000 005

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Hong-bo LIU, Xue-shun SHI, Xin-gang ZHUANG, Peng-ju ZHANG, Chang-ming LIU, Heng-fei WANG. Simulation and Experimental Measurement of Cryogenic Radiometer Cavity With Different Structures[J]. Spectroscopy and Spectral Analysis, 2022, 42(2): 654

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