Chinese Optics, Volume. 17, Issue 3, 580(2024)
A simplified method for high temperature calibration in the visible light band
Fig. 1. Experimental setup of high temperature calibration for RGB camera
Fig. 2. The mean gray values for each channel of camera varying with the exposure time
Fig. 3. The mean gray values for each channel of the camera as a function of the brightness of the blackbody radiation. (a) R channel; (b) G channel; (c) B channel
Table 1. The slope and intercept values of each channel of an RGB camera under certain exposure time
View tableView in ArticleTable 1. The slope and intercept values of each channel of an RGB camera under certain exposure time
R通道曝光 时间/μs R通道斜率 /(DN·W−1·m2·sr) R通道 截距/DN G通道曝光 时间/μs G通道斜率 /(DN·W−1·m2·sr) G通道 截距/DN B通道曝光 时间/μs B通道斜率 /(DN·W−1·m2·sr) B通道 截距/DN 145 2.17 50.58 276 2.52 50.74 137 0.84 53.08 364 5.44 52.79 480 4.37 53.10 444 2.72 55.12 545 8.14 54.70 575 5.24 54.06 534 3.27 55.90
Table 2. 9 unknowns for simplified calibration
View tableView in ArticleTable 2. 9 unknowns for simplified calibration
$ {K_{\rm{r}}} $ （W−1·m2·sr·μs−1） $ {B_{\rm{r}}} $ （W−1·m2·sr·μs−1） $ G_{\rm{r}}^{\rm{noise}} $ （DN） $ {K_{\rm{g}}} $ （W−1·m2·sr·μs−1） $ {B_{\rm{g}}} $ （W−1·m2·sr·μs−1） $ G_{\rm{g}}^{\rm{noise}} $ （DN） $ {K_{\rm{b}}} $ （W−1·m2·sr·μs−1） $ {B_{\rm{b}}} $ （W−1·m2·sr·μs−1） $ G_{\rm{b}}^{\rm{noise}} $ （DN） 0.0149 0.0103 49.07 0.0091 0.0112 47.67 0.0061 0.0070 52.10
Table 3. Error between calculated and calibrated values
View tableView in ArticleTable 3. Error between calculated and calibrated values
温度(K) 400 μs 500 μs R(％) G(％) B(％) R(％) G(％) B(％) 973.15 −1.11 0.43 −0.22 2.17 −0.57 0.73 1023.15 0.32 0.91 −0.57 3.38 −0.15 −0.40 1073.15 −0.06 2.56 1.01 0.63 0.38 1.10 1123.15 0.78 2.48 −1.14 −1.98 0.28 −0.89 1173.15 −0.05 2.49 0.03 −2.82 0.53 −0.20 1223.15 −0.18 1.09 0.62 1.15 −0.75 −0.83 1273.15 -- 0.23 0.72 -- −0.00 −0.04 1323.15 -- -- −0.45 -- -- −0.03
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Yun-long LI, Zhou LI, Zhi-yuan SUN, Guo-qing YANG. A simplified method for high temperature calibration in the visible light band[J]. Chinese Optics, 2024, 17(3): 580
Category: Original Article
Received: Jul. 21, 2023
Accepted: Aug. 30, 2023
Published Online: Jul. 31, 2024
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