Acta Photonica Sinica, Volume. 51, Issue 10, 1012003(2022)
Impact of Ambient Temperature on Average Luminous Intensity of LED（Invited）
Figures & Tables(8)
Fig. 1. Measuring device for average luminous intensity of single LED
Fig. 2. Schematic of average luminous intensity measurement of single LED
Fig. 3. Variation of the expanded uncertainty Ukof the average luminous intensity measurement of the LED standard tubes with the ambient temperature
Fig. 4. Variation curve of the experimental relative value η（i）of the average luminous intensity for the LED standard tubes with the ambient temperature
Table 1. Average luminous intensity value of LED standard tube under far-field conditions
View tableView in ArticleTable 1. Average luminous intensity value of LED standard tube under far-field conditions
CIE A（L = 316 mm） 1 2 3 4 5 6 7 8 9 10 R120905 3.668 3.668 3.668 3.667 3.667 3.667 3.667 3.668 3.668 3.669 G120905 0.212 0.211 0.211 0.210 0.210 0.211 0.212 0.212 0.212 0.212 B120905 0.196 0.196 0.196 0.194 0.195 0.196 0.196 0.196 0.196 0.196
Table 2. Average luminous intensity value of LED standard tube under near-field conditions
View tableView in ArticleTable 2. Average luminous intensity value of LED standard tube under near-field conditions
CIE B（L = 100 mm） 1 2 3 4 5 6 7 8 9 10 R120905 2.868 2.868 2.868 2.867 2.867 2.867 2.867 2.868 2.868 2.869 G120905 0.215 0.215 0.214 0.214 0.215 0.215 0.215 0.213 0.214 0.214 B120905 0.177 0.176 0.176 0.176 0.177 0.176 0.176 0.176 0.176 0.176
Table 3. Standard uncertainty components and related information
View tableView in ArticleTable 3. Standard uncertainty components and related information
Sources of uncertainty Standard uncertainty components Degrees of freedom Uncertainty category Measurement repeatability 0.37% 9 A Electrical measurement system 0.01% ∞ B Measurement distance 0.87% ∞ B Positioning angle 0.29% ∞ B LED supply current 0.29% ∞ B
Table 4. Average luminous intensity and expanded measurement uncertainty of the LED standard tubes in the ambient temperature range of 19.0 ℃~30.0 ℃
View tableView in ArticleTable 4. Average luminous intensity and expanded measurement uncertainty of the LED standard tubes in the ambient temperature range of 19.0 ℃~30.0 ℃
T/oC I631 nm/cd I533 nm /cd I465 nm /cd U 631 nm U 533 nm U465 nm 19.0 3.845 0.217 0.200 5.2 3.2 2.6 19.5 3.826 0.216 0.199 4.6 2.9 2.5 20.0 3.826 0.215 0.198 4.1 2.7 2.4 20.5 3.807 0.215 0.198 3.6 2.5 2.3 21.0 3.807 0.214 0.197 3.1 2.3 2.2 21.5 3.787 0.213 0.196 2.7 2.2 2.1 22.0 3.768 0.213 0.194 2.3 2.1 2.0 21.5 3.751 0.212 0.193 2.1 2.0 2.0 22.0 3.766 0.212 0.191 2.0 2.0 2.0 23.5 3.749 0.211 0.189 2.1 2.0 2.0 24.0 3.736 0.211 0.188 2.3 2.1 2.0 24.5 3.744 0.210 0.186 2.7 2.2 2.1 25.0 3.729 0.209 0.185 3.1 2.3 2.2 25.5 3.710 0.208 0.184 3.6 2.5 2.3 26.0 3.721 0.207 0.183 4.1 2.7 2.4 26.5 3.712 0.207 0.181 4.6 2.9 2.5 27.0 3.691 0.206 0.181 5.2 3.2 2.6 27.5 3.672 0.205 0.180 5.7 3.4 2.8 28.0 3.685 0.204 0.180 6.3 3.7 2.9 28.5 3.672 0.203 0.179 6.9 3.9 3.1 29.0 3.676 0.202 0.178 7.4 4.2 3.2 30.0 3.653 0.202 0.177 8.0 4.5 3.4
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Yi LI, Heng ZHANG, Wenrui DUAN, Weidong QIAO, Fei GAO. Impact of Ambient Temperature on Average Luminous Intensity of LED（Invited）[J]. Acta Photonica Sinica, 2022, 51(10): 1012003
Paper Information
Category: Instrumentation, Measurement and Metrology
Received: Jul. 1, 2022
Accepted: Jul. 28, 2022
Published Online: Nov. 30, 2022
The Author Email: QIAO Weidong (qwd@xaut.edu.com)
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