Comparative Study on Total Radiant Flux Measurement of Near-UV LEDs
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摘要: 总辐射通量是表征近紫外LED光辐射特性的技术指标之一,通过测量LED的光谱总辐射通量(Total Spectral Radiant Flux,TSRF)可导出总辐射通量值。近年来中国计量科学研究院开展了TSRF的测量技术研究,并建立了350~1100 nm光谱范围的总辐射通量计量标准装置。在TSRF的计量技术研究过程中,为验证近紫外区域的不确定度评估的可靠性,分别使用TSRF标准测量装置和自行搭建的卧式变角辐射计,测量了近紫外LED的TSRF和总辐射通量值。通过比较表明,两种技术途径测量所得值在不确定度范围内具有一致性;在近紫外区域对TSRF标准测量装置的不确定度评估合理,量值可靠。Abstract: Total radiant flux is one of the technical indicators to characterize the radiation properties of near-UV LEDs, which can be derived by measuring the total spectral radiant flux (TSRF). In recent years, the National Institute of Metrology has carried out research on the measurement technology of TSRF, and established a standard device for measuring the TSRF ranging from 350 to 1100 nm. To verify the reliability of the uncertainty assessment in the near-UV region, the TSRF and total radiant flux values of near-UV LEDs were measured using a TSRF standard measurement device and a self-built horizontal goniospectroradiometer, respectively. The comparison shows that the values obtained by the two technical approaches are consistent within the uncertainty range. The uncertainty assessment of the TSRF standard measurement device in the near-UV region is reasonable and the values are reliable.
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Key words:
- near-UV LED /
- total radiant flux /
- total spectral radiant flux /
- goniospectroradiometer /
- uncertainty
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表 1 近紫外LED的测量结果
Table 1. Measurement results of near-UV LEDs
TSRF计量标准装置 卧式变角辐射计 相对偏差 368 nm的TSRF(W/nm) 总辐射通量(W) 368 nm的TSRF(W/nm) 总辐射通量(W) 368 nm的TSRF(W/nm) 总辐射通量(W) UV-LED#1 2.850E-2 3.994E-1 2.829E-2 4.015E-1 0.7% −0.5% UV-LED#2 2.906E-2 4.117E-1 2.910E-2 4.162E-1 −0.2% −1.1% UV-LED#3 2.796E-2 3.959E-1 2.828E-2 4.031E-1 −1.1% −1.8% 表 2 近紫外LED的量值一致性
Table 2. Consistency results of near-UV LEDs
368 nm的TSRF 总辐射通量 通量常数 常数平均值 通量常数与平均值的相对偏差 通量常数 常数平均值 通量常数与平均值的相对偏差 UV-LED#1 0.9926 1.0018 −0.92% 1.0053 1.0114 −0.60% UV-LED#2 1.0015 −0.03% 1.0108 −0.06% UV-LED#3 1.0114 0.95% 1.0181 0.66% -
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