Ms. Qiutong Cheng Profile

Qiutong Cheng

at National Institute of Metrology

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Proceedings Article | 18 April 2021 Poster + Presentation + Paper

Research of UV radiometer based on fiber spectroradiometer

Yanfei Wang, Caihong Dai, Ling Li, Zhifeng Wu, Ning Xu, Chaoqun Xu, Qiutong Cheng, Shufang He, Yihang Xie

Proceedings Volume 11772, 1177226 (2021) https://doi.org/10.1117/12.2593578

KEYWORDS: Ultraviolet radiation, Radiometry, Stray light, Temperature metrology, Light sources, Ultraviolet sources, Sensors, Optical testing, Lamps, Environmental sensing

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UV radiometers are used in many areas. There are many kinds of UV light sources with different peak wavelength and different wavelength range. The broadband UV radiometers are wildly used due to easy to use and low cost. However, there are some obvious disadvantages for the broadband radiometers. They cannot distinguish the spectral characteristics of UV sources. That will cause the spectral mismatch measurement error for the UV broadband radiometers calibration. Recently, the fiber spectroradiometer plays a more and more important role in this area. The fiber spectroradiometer is more portable and low cost compared to the double grating spectroradiometer. We can obtain the spectral characteristics and any UV irradiance using the fiber spectroradiometer. However, for most fiber spectroradiometers, we cannot use them to replace the UV broadband radiometers for the absolute irradiance measurement. There are four key effects for that. The first one is the stray light. Stray light effect is obvious for the fiber spectroradiometer, especially in the UV wavelength range. The second one is the temperature effect. The third one is the non-linearity effect. The fourth one is the bandwidth effect. This effect will cause the measurement error for the spectral distribution of the UV source. In this paper, we research the four factors that reduce the measurement accuracy of the fiber spectroradiometer in UV wavelength range.

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