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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.
고정밀 백금저항온도계를 이용한 교정기관의 온도교정능력 수행평가
감기술 ( Kee Sool Gam ),이영희 ( Young Hee Lee ),양인석 ( In Seok Yang ) 한국센서학회 2013 센서학회지 Vol.22 No.6
Calibration capabilities for thermometer calibration by comparison method were assessed using high-precision industrial platinum resistance thermometers (IPRT). It was found in the performance assessment that out of 31 laboratories who participated, 28 laboratories resulted magnitude of En number less than 1 at every calibration points they submitted results in the range from 50 to 500℃. The results of about 75% of the laboratories showed the difference from the assigned values less than 1/10 of the tolerance level of the class B IPRT. This indicates that the participating calibration laboratories performed with satisfactory level that was enough to calibrate IPRTs to significant precision. The sensors used in this work were manufactured and chosen by the criteria of long-term instability less than 4 mK and hysteresis less than 8 mK in the temperature range used in this work. Furthermore, the change in the resistance of the sensors in the calibration temperature range were less than the uncertainty of the calibration, 25 mK (k=2).
핵심국제비교용 물의 삼중점 셀 제작과 비교 실험 및 불확도 평가
강기훈 ( Kee Hoon Kang ),김용규 ( Yong Gyoo Kim ),감기술 ( Kee Sool Gam ) 한국센서학회 2004 센서학회지 Vol.13 No.2
N/A The Comete` Consultatif de Thermome`trie (CCT) under the Comete International des Poids et Measures (CIPM) has decided to perform the Key Comparison (KC) for triple point of water cells used as a reference fixed point of thermometry at the 21st meeting held at November 2001, and the Bureau International des Poids et Measures (BIPM) has been nominated as a KC coordinator. According to the KC protocol prepared by BIPM, KRISS performed the KC experiments and evaluate a uncertainty. The temperature difference between two reference cells for the Korea Research Institute of Standards and Science (KRISS) and a test cell for the transfer standard, which is moved to BIPM was 0.024 mK and the combined standard uncertainty evaluated 0.055 mK.
캡슐형 백금저항온도계 국제비교를 위한 네온 , 산소 , 아르곤 , 수은 및 물의 삼중점 실현
강기훈(Kee Hoon Kang),김용규(Yong Gyoo Kim),감기술(Kee Sool Gam) 한국센서학회 2000 센서학회지 Vol.9 No.3
N/A Triple points of high purity materials have been used to calibrate primarily the capsule-type platinum resistance thermometer (PRT) in the temperature range of the triple point of equilibrium hydrogen (13.8033 K) and water (273.16 K). In this work, triple points of Ne, O₂, Ar, Hg and Hz0 except for the triple point of equilibrium hydrogen were realized to establish the International Temperature Scale of 1990 (ITS-90). At each fixed point, two capsule-type PRTs, which were selected for the international comparison, were tested two times. The combined uncertainties of the realization of each triple point were calculated considering the type A and type B evaluation. In Korea Research Institute of Standards and Science, the combined standard uncertainties of the defining triple points by the ITS-90 were estimated to about 0.18 mK for Ne, 0.14 mK for O₂, 0.14 mK for Ar, 0.24 mK for Hg and 0.11 mK for H₂O, respectively.
전기로 및 봉입형 응고점 셀 내의 온도구배가 미치는 표준백금저항온도계 온도측정의 불확도 요소 평가
강기훈 ( Kee Hoon Kang ),감기술 ( Kee Sool Gam ),김용규 ( Yong Gyoo Kim ),송창호 ( Chang Ho Song ) 한국센서학회 2004 센서학회지 Vol.13 No.6
N/A In the international temperature scale of 1990 (1TS-90), standard platinum resistance thermometer (SPRT) is a defining standard thermometer used in the temperature range from 13.8033 K to 961℃. Uncertainty of SPRT is about several mK and uncertainty of defining fixed points of the ITS-90 which is used for calibrating SPRT is about several tenth of mK. Above 0℃. the defining fixed points are gallium melting point and indium, tin, zinc, aluminium and silver freezing points which are all realized using an electric furnace or a liquid bath. To realize freezing point of tin (231.928℃) and zinc (419.527℃), two 3-zone furnaces which have 3 electric heaters were manufactured. Temperature gradient of the constructed furnaces were tested. Uncertainty. caused by temperature gradient of furnace and immersion effect of SPRT in the sealed-type freezing point cells were evaluated 0.038 mK for tin freezing point and 0.036 mK for zinc freezing point.