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http://dx.doi.org/10.7842/kigas.2017.21.5.1

Effects of Gas Background Temperature Difference(Emissivity) on OGI(Optical Gas Image) Clarity  

Park, Su-Ri (Dept. of Chemical Engineering, Soongsil University)
Han, Sang-Wook (Dept. of Chemical Engineering, Soongsil University)
Kim, Byung-Jick (Dept. of Chemical Engineering, Soongsil University)
Hong, Cheol-Jae (Dept. of Organic Materials & Fiber Engineering, Soongsil University)
Publication Information
Journal of the Korean Institute of Gas / v.21, no.5, 2017 , pp. 1-8 More about this Journal
Abstract
Currently gas safety management in the industrial field has been done by LDAR as contact method or methane leak detector as non-contact method. But LDAR method requires a lot of man-power and methane leak detector have the limitation of methane only. Therefore the Research on the OGI(optical gas image) has big attention by industry. This research was undertaken to see the effect of background temperature difference of gas cloud on the clarity of OGI. The background temperature control panel was constructed to cool down the background temperature. OGI was taken at the various methane gas ejection rate and the designed temperature difference. The experimental results showed that the OGI(when the temperature difference is $-6^{\circ}C$) is more clear thane the OGI(when the temperature difference is zero). To quantify the clarity difference, MATLAB's RGB analysis method was employed. The RGB value of the OGI at ${\Delta}T-6^{\circ}C$ was 20% lower than the OGI at ${\Delta}T0^{\circ}C$. The clarity difference by T difference can be explained by the total radiation law. When the background temperature of the gas is lower than the air temperature, the radiation energy coming into the OGI lens is increasing. As the energy is increasing, the OGI image becomes clear.
Keywords
Emissivity; Gas cloud; OGI(Optical Gas Image); LDAR; Background temperature difference;
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