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감기술,김용규,김선곤 ( Kee Sool Gam,Yong Gyoo Kim,Sun Gon Kim ) 한국센서학회 1995 센서학회지 Vol.4 No.1
We measured the traceability error for nine high temperature calibration service centers including type S through the round-robin test. In this test the type S thermocouple, which used as a calibration standard thermometer commonly, was accommodated as a test thermocouple. Intercomparison data of three institutions were coincident with KRISS`s data within ±0.5℃, which was the calibration uncertainty of the type S thermocouple, but the remaining six institution`s data were deviated from the assigned uncertainty level. Deviation of the intereomparison data increased gradually according to the increase of the test temperature, and the maximum difference was so large as about 2.0 ℃ at the highest test temperature, gold point. In this study found the traceability error of high temperature calibration service center for a high temperature standard was within 2.0℃.
감기술,박종철,장충근 경북대학교 센서기술연구소 1997 센서技術學術大會論文集 Vol.8 No.1
In the ITS-90 the range of a high-temperature platinum resistance thermometer(HTPRT) restricted to the freezing-point of silver(961.78 ℃). To extend the usable temperature range of a HTPRT, synthetic sapphire single crystal was used as insulation materials. The sensing element consisted of a single-layer bifilar platinum winding on a notched blade of x-shaped sapphire rod. The platinum wire used as sensing coil was 99.9999 % wt.% pure with 0.5 mm in diameter. Two pieces of HTPRT have the nominal resistance of 0.14 Ω at the triple point of water. HTPRTs were calibrated at the freezing points of Cu, Ag, Al, Zn, Sn and the melting point of Ga and the triple point of water and compared with the calibrated type S thermocouple from 500 ℃ to 1500 ℃. All measured values at fixed points nearly satisfied with the ITS-90 criteria, and the temperature-resistance characteristics of HTPRTs were proportional to temperature increases in the range of 0 ℃ to 1500 ℃. The insulation resistances at 700 ℃ was 1035 MΩ and decreased to 63 kΩ at 1500 ℃ exponentially.
고상반응법에 의한 Fe-Al-Si-Ti-O계 써어미스터 소결체 합성
감기술,강기훈,Gam, Kee-Sool,Gang, Gi-Hun 한국재료학회 1991 한국재료학회지 Vol.1 No.4
$Fe_2O_3,\;Al_2O_3,\;TiO_2$ 및 Si분말을 사용하여 고상반응법으로 써어미스터 소결체를 합성하였다. 합성된 소결체의 조식특성을 SEM으로 조사하고, 액체항온조에서 $-50~+50^{\circ}C$ 온도영역에서의 측정 결과 $\beta$상수가 972~4005K의 값을 갖는 써어미스터 소결체를 얻었다. 이 소결체는 고공기온측정을 위한 라디오존데용 온도센서로 사용될 수 있다. Sintered thermistor body was fabricated by solid reaction method using $Fe_2O_3, \;Al_2O_3, \;TiO_2$ and Si powder. Surface matrix of sintered body was investigated by SEM and $\beta$-constant was obtained from measurement of resistance variation in liquid bath. The values of thermistor constant $\beta$ of samples in the temperature range $-50~+50^{\circ}C$ were distributed from 927 to 4005k. This thermistor body can be used as temperature sensor for radiosonde.
감기술 ( Kee Sool Gam ),김용규 ( Yong Gyoo Kim ),양인석 ( In Seok Yang ) 한국센서학회 2011 센서학회지 Vol.20 No.5
We demonstrated that high-stability thermistors can be calibrated with an uncertainty less than 1 mK, if the error due to the heat conduction is minimized. We first investigated the effect of the self-heating of typical thermistor probes to see how accurate we need to determine the effect of self-heating. We, then, calibrated thermistors and fitted the results using various modeling equations. We found out that the heat conduction is an important factor in achieving the calibration uncertainty under 1 mK for thermistors when the diameter of the probe is as thick as 10 mm. Therefore, we controlled the room temperature within 0.5 。C to minimize the heat conduction error during the calibration. The calibration with an uncertainty below 1 mK was possible when the stabilization time for each calibration was long enough to obtain a good thermal equilibrium.