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| Determination of the Reflection Loss in the Measurement of UV Output of UV-LED by KI/KIO3 Chemical Actinometer |
| ZHANG Lian-feng1,ZHOU Yu1,2,CHANG Bao-yan3,XION Dong4,YAN Jian-chang5,SHENG Cong-min6,WANG Chun-yong2 |
1. Laboratory of Ecology and Environmental Protection, Research Institute of Tsinghua University in Shenzhen, Shenzhen, Guangdong 518057, China
2. School of Chemical & Environmental Engineering, Liaoning University of Technology, Jinzhou, Liaoning 121001, China
3. Wuxi Huazhaohong Photoelectric Technology Co., Ltd, Wuxi, Jiangsu 214112, China
4. Shenzhen Jinghong Lighting Co., Ltd, Shenzhen, Guangdong 518000, China
5. Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China
6. Advanced Ultraviolet Optoelectronics Co., Ltd,Changzhi,Shanxi 046000, China |
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Abstract When measuring the UV output with KI/KIO3, due to the reflection of the liquid surface, part of the photons of the incident light do not enter the liquid, resulting in measurement errors. According to the Fresnel equation, the amount of reflection is closely related to the angle of incidence, and the radiation angle of each beam of light emitted by the UV LED and the angle of incidence into the solution are different.To quantify total reflection amount caused by such complicated emission angles and incident angles, the vortex of the solution of chemical actinometer was photographed, and the mathematical analysis was carried out to establish the method for accurately calculating the reflection loss. The calculated reflection coefficient can compensate the reflection loss to get accurate measurement results. The calculation also can reversely guide the measurement process to control the operating condition to keep smaller reflection. Based on photographed vortexes formed by rotating the liquid, the reflection coefficient can be controlled stably at about 0.025. The stableness of the reflection coefficient indicates that the error due to reflections can be avoided.
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Received: 27 April 2022
Published: 17 July 2023
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2023, Vol. 44 
