DOI: 10.1002/jgrd.50642
论文题名: A method for optimizing the cosine response of solar UV diffusers
作者: Pulli T. ; Kärhä P. ; Ikonen E.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 14 起始页码: 7897
结束页码: 7904
语种: 英语
英文关键词: cosine response
; diffusers
; Monte Carlo
; solar UV
Scopus关键词: Algorithms
; Computer software
; Light
; Monte Carlo methods
; Optimization
; Angular response
; Cosine response
; Design process
; Monte carlo algorithms
; Radiation transport
; Relative measurement
; Software implementation
; solar UV
; Diffusers (optical)
; algorithm
; Monte Carlo analysis
; optimization
; simulation
; software
; ultraviolet radiation
; weather
英文摘要: Instruments measuring global solar ultraviolet (UV) irradiance at the surface of the Earth need to collect radiation from the entire hemisphere. Entrance optics with angular response as close as possible to the ideal cosine response are necessary to perform these measurements accurately. Typically, the cosine response is obtained using a transmitting diffuser. We have developed an efficient method based on a Monte Carlo algorithm to simulate radiation transport in the solar UV diffuser assembly. The algorithm takes into account propagation, absorption, and scattering of the radiation inside the diffuser material. The effects of the inner sidewalls of the diffuser housing, the shadow ring, and the protective weather dome are also accounted for. The software implementation of the algorithm is highly optimized: a simulation of 10 9 photons takes approximately 10 to 15 min to complete on a typical high-end PC. The results of the simulations agree well with the measured angular responses, indicating that the algorithm can be used to guide the diffuser design process. Cost savings can be obtained when simulations are carried out before diffuser fabrication as compared to a purely trial-and-error-based diffuser optimization. The algorithm was used to optimize two types of detectors, one with a planar diffuser and the other with a spherically shaped diffuser. The integrated cosine errors - which indicate the relative measurement error caused by the nonideal angular response under isotropic sky radiance - of these two detectors were calculated to be f2 =1.4% and 0.66%, respectively. Key Points An algorithm for simulating solar UV diffusers was developed The structures of two diffusers were optimized The effects of diffuser parameters on the angular response were studied ©2013. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63539
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Metrology Research Institute, Aalto University, Otakaari 5 A, FI-02150 Espoo, Finland; Centre for Metrology and Accreditation MIKES, Espoo, Finland
Recommended Citation:
Pulli T.,Kärhä P.,Ikonen E.. A method for optimizing the cosine response of solar UV diffusers[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(14)