Time constant optimization of solar irradiance absolute radiometer

We experimentally evaluate and optimize the time constant of solar irradiance absolute radiometer（SIAR）. The systemic error introduced by variable time constant is studied by a finite element method. The results shown that, with a classic time constant of 30 s for SIAR, the systemic errors are 0.06%...

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Published inOptoelectronics letters Vol. 13; no. 3; pp. 179 - 183
Main Author 唐潇 方伟 王玉鹏 杨东军 衣小龙
Format Journal Article
LanguageEnglish
Published Tianjin Tianjin University of Technology 01.05.2017
Springer Nature B.V
Subjects
Error analysis
Finite element method
Irradiance
Lasers
Optical Devices
Optics
Photonics
Physics
Physics and Astronomy
Radiometers
SIAR
Time constant
Uncertainty
不确定性
优化
太阳辐射
太阳辐照度
时间常数
有限元法
绝对辐射计
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ISSN1673-1905
1993-5013
DOI10.1007/s11801-017-7032-7

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Summary:We experimentally evaluate and optimize the time constant of solar irradiance absolute radiometer（SIAR）. The systemic error introduced by variable time constant is studied by a finite element method. The results shown that, with a classic time constant of 30 s for SIAR, the systemic errors are 0.06% in the midday and 0.275% in the morning and afternoon. The uncertainty level which can be considered negligible for SIAR is also investigated, and it is suggested that the uncertainty level has to be less than 0.02%. Then, combining the requirement of international comparison with these two conclusions, we conclude that the suitable time constant for SIAR is 20 s.
Bibliography:12-1370/TN
radiometer absolute classic uncertainty negligible afternoon morning requirement optimize meaningful
We experimentally evaluate and optimize the time constant of solar irradiance absolute radiometer（SIAR）. The systemic error introduced by variable time constant is studied by a finite element method. The results shown that, with a classic time constant of 30 s for SIAR, the systemic errors are 0.06% in the midday and 0.275% in the morning and afternoon. The uncertainty level which can be considered negligible for SIAR is also investigated, and it is suggested that the uncertainty level has to be less than 0.02%. Then, combining the requirement of international comparison with these two conclusions, we conclude that the suitable time constant for SIAR is 20 s.
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ISSN:1673-1905
1993-5013
DOI:10.1007/s11801-017-7032-7