Infrared and Laser Engineering, Volume. 51, Issue 9, 20210984(2022)
Measurement technique research for the absorptivity of cryogenic radiometer absorbing cavity at the 4 K temperature
Figures & Tables(11)
Fig. 2. The spectral specular reflectance measurement curve of the coating with different incidence angles
Fig. 3. Schematic diagram of reflectivity measurement of absorption cavity
Fig. 6. Principle diagram of the absorption coefficient measurement of the absorption cavity under different temperature conditions
Fig. 7. Physical image of the reflectivity measurement device of the absorbing cavity
Fig. 8. Physical diagram of the absorbing cavity absorptivity measurement device under variable temperature conditions
Table 1. Summary of measurement results of the reflectivity of the absorbing cavity
View tableView in ArticleTable 1. Summary of measurement results of the reflectivity of the absorbing cavity
Number of measurements $\dfrac{ { {V_c} } }{ { {V_s} } }$ $\dfrac{ {V_s'} }{ {V_c'} }$ $ \;{\rho _c} $ $ \;{\rho _c} $ $ \;{\rho _c} $ $ 1 - \;{\rho _c} $ 1 0.0002375 0.99992 0.0002351 0.000 2417 5.3×10−6 0.99976 2 0.0002418 0.99994 0.0002394 3 0.0002502 0.99991 0.0002477 4 0.0002392 0.99992 0.0002368 5 0.0002408 0.99995 0.0002384 6 0.0002415 0.99993 0.0002391 7 0.0002398 0.99994 0.0002374 8 0.0002518 0.99992 0.0002493 9 0.0002483 0.99996 0.0002458 10 0.0002502 0.99995 0.0002477
Table 2. Summary of the measurement results of the absorbing cavity absorptivity
View tableView in ArticleTable 2. Summary of the measurement results of the absorbing cavity absorptivity
Number of measurements $\dfrac{ { { {{V} }_{\text{T} } } }}{ { { {{V} }_{} } } }$ $ {\rho _c}\left( {632.8} \right) $ ${\rho _{_{\rm{ T}}} }\left( {632.8} \right)$ 1− ${\rho _{_{\rm {T} } } }\left( {632.8} \right)$ 1− ${\rho _{_{\rm {T}}} }\left( {632.8} \right)$ 1− ${\rho _{_{\rm {T}}} }\left( {632.8} \right)$ standard deviation 1 1.208611 0.0002417 0.0002921 0.9997079 0.99971 2.2×10−5 2 1.213973 0.0002934 0.9997066 3 1.223985 0.0002958 0.9997042 4 1.213982 0.0002934 0.9997066 5 1.209048 0.0002922 0.9997078 6 1.223989 0.0002958 0.9997042 7 1.234034 0.0002983 0.9997017 8 1.213992 0.0002934 0.9997066 9 1.228026 0.0002968 0.9997032 10 1.209935 0.0002924 0.9997076
Table 3. Analysis of measurement uncertainty
View tableView in ArticleTable 3. Analysis of measurement uncertainty
Uncertainty component Standard uncertainty Evaluation method Uncertainty component introduced by absorptivity measurement u1 0.2×10−4 Type B Uncertainty component introduced by the output V of the detector u2 8×10−9 Type B Uncertainty component introduced by the output VT of the detector u3 8×10−9 Type B Uncertainty component introduced by measurement repeatability u4 0.07×10−4 Type A Combined standard uncertainty 0.22×10−4 Relative combined standard uncertainty 0.0022% Relative expanded uncertainty（k=2） 0.005%
Tools
Get Citation
Copy Citation Text
Bing Yu, Jihong Fan, Linguang Yuan, Yan Li, Lei Guo, Xiao Wang, Junwei Chu, Yan Qin, Yunan Sun, Deng Zhang, Yue You, Weiqi Jin. Measurement technique research for the absorptivity of cryogenic radiometer absorbing cavity at the 4 K temperature[J]. Infrared and Laser Engineering, 2022, 51(9): 20210984
Paper Information
Category: Photoelectric measurement
Received: Dec. 17, 2021
Accepted: Jan. 13, 2022
Published Online: Jan. 6, 2023
The Author Email:
© Copyright 2018-2021 | Chinese Laser Press.
All Rights Reserved 沪ICP备15018463号-20