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Fe - Cr - Ni 합금의 저온에서의 자기적 성질에 관한 연구
안병덕(B. D. Ahn),김진옥(J. O. Kim),장경호(Kyung Ho Chang),송기영(K. Y. Song) 한국자기학회 1993 韓國磁氣學會誌 Vol.3 No.4
The temperature dependence of DC magnetic susceptibilities of three austenitic Fe-Cr-Ni stainless alloys were measured in the temperature range of 4.2 and 300 K. Two alloys support a general magnetic description of austenitic stsinless steels in terms of a two-magnetic-phase (spin glass + superparamagnetic cluster) model and one alloy shows magnetic double transition phenomena. Also this study shows that incressing the Ni / Cr ratio in Fe-Cr-Ni alloys causes a increase of the DC susceptibility peak value and a decrease of the magnetic transition temperature.
장경호,이용재,김광표,안병덕 ( KYung Ho Chang,Yong jae lee,kwang Pyo kim,Byung Duk Ahn ) 한국센서학회 1995 센서학회지 Vol.4 No.3
For the development of liquid density measuring sensor using the natural frequency of a pipe, its principle and construction method were described. The stainless steel pipe, which has length of 3 cm, inside diameter of 2.3 cm and outside diameter of 2.5 cm, was used for the sensor. The exciting coil and the photo sensor were used to excite and to pick-up it, and the feedback circuit was designed to continue its vibrating. The natural frequency was consistent with the result of the spectrum analysis. It had a linearity of 0.0027 % and a sensitivity of 0.032 in liquid density range from 0.8 g/㎤ to 1.4 g/㎤ and its frequency variation ratio was 0.024 %/℃ in temperature range from 10℃ to 35℃.