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박상국,황원호 위덕대학교 산업기술연구소 2001 산업기술연구소 논문집 Vol.5 No.1
In this Research, we have developed the infrared radiation thermometer to measuring the temperature in the very harsh environmental conditions. The Optical fiber was used to overcome the environmental troubles of the pyrometer. We performed extensive field test for 4 months at the rear side of A.C.U. in POSCO (Pohang) 2nd hot plate mill. Through the test, we have confirmed the reliability of the developed pyrometer.
저온 주사 레이저 현미경(LTSLM)을 이용한 YBCO 초전도 선재의 불균질성 연구
박상국,김종만,이상봉,김상훈,김가영,이형철,Park, S.K.,Kim, J.M.,Lee, S.B.,Kim, S.H.,Kim, G.Y.,Ri, H.C. 한국초전도학회 2009 Progress in superconductivity Vol.11 No.1
Low temperature scanning laser microscopy (LTSLM) can be used for a two-dimensional display of bolometric response arising from the localized excitation of a sample by the focused laser beam. In this study, the distribution of critical temperature ($T_c$) and critical current density ($J_c$) in YBCO coated conductor were analyzed using LTSLM. For improving the temperature stability, we have modified the system into a double-shielding type. Through the modification, the temperature stability was successfully improved from ${\pm}10mK\;to\;{\pm}2mK$. The superconducting properties of YBCO coated conductors were measured for the sample of a narrow bridge type using wet etching process. The spatial non-uniformity of the ac voltage response, ${\delta}V(x)$, which is proportional to ${\partial}\rho(x,J_B)/{\partial}T$ in the transition temperature region could be observed and displayed in a two-dimensional image.