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《Acta Photonica Sinica》 2015-12
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Design of Spectroradiometer Incidence System Based on Lightcone Coupling

YANG Li-yan;ZHANG Guo-yu;ZHENG Ru;BIAN Zhen-zhen;ZHENG Feng;HU Bing;Photoeletric Engineering College,Changchun University of Science and Technology;Key Laboratory of Photoelectric Measurement & Optical Information Transmission Technology of Ministry of Education;Jilin Photoelectric Measurement and Control Instrument Engineering Research Center;  
A spectroradiometer incidence system was designed to realize the coupling of direct irradiance.In order to reduce energy loss between light-collecting barrel and fiber,and solve the problem of low energy level in direct coupling,the characteristic dimensions of the barrel were restrained,the lightcone parameters were calculated according to the geometrical optics theory.The coupling efficiency in different wavelengths and change of efficiency under different tracking angle errors were tested by solar simulator.The theory analyses indicate that axis' s lateral offset of lightcone and fiber is the main factor that caused coupling efficiency loss.Experimental results indicate that the coupling efficiency of the whole system is66.24%,the efficiency is 12.8% when the sun tracker miss the sun completely,which reflects the level of circumsolar radiation and scattered radiation.The system can satisfy the requirements for the observation of direct solar irradiation.
【Fund】: National Public Welfare Industry Research Projects(No.GYHY201406037)
【CateGory Index】: TN253;TK513.4
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