서지주요정보
자기 이력 과정에서 발생하는 조화파의 물성에 따른 변화와 조화파 결합을 이용한 마그네토미터의 제작 = Analysis of harmonics generated during magnetization and a harmonics coupled magnetometer
서명 / 저자 자기 이력 과정에서 발생하는 조화파의 물성에 따른 변화와 조화파 결합을 이용한 마그네토미터의 제작 = Analysis of harmonics generated during magnetization and a harmonics coupled magnetometer / 전충삼.
저자명 전충삼 ; Jun, Chung-Sam
발행사항 [대전 : 한국과학기술원, 1996].
Online Access 원문보기 원문인쇄

소장정보

등록번호

8006867

소장위치/청구기호

학술문화관(문화관) 보존서고

DPH 96028

SMS전송

도서상태

이용가능

대출가능

반납예정일

초록정보

A theory for magnetic hysteresis, magnetization potential model was introduced, which was based on the motion of magnetic domain wall. The magnetization potential model can be applied to the description of the magnetic hysteresis of both isotropic and anisotropic ferromagnetic material in almost all range of magnetic field. Hysteresis and harmonics generated during magnetization of 3% Si-Fe were experimentally measured along magnetization angle, and were compared with those calculated from the model. For the magnetization angle of 0 degree, the theoretical hysteresis, first and third harmonics agreed quantitatively with those experimentally obtained. As the magnetization angle increased, the theoretical hysteresis and harmonics agreed qualitatively with those of experimentally obtained result. Analysis of the harmonics generated during magnetization of grain-oriented 3% Si-Fe specimens with 3 different grain sizes provided the information about the micro-structure. The first harmonic signal increased greatly than third harmonic signal with the increase of saturation magnetization, whereas the third harmonic signal increased greatly than 1st harmonic signal with the increase of magnetic moment coupling constant. The 9th harmonic signal also increased and cut-off harmonics shifted toward lower order harmonics as anisotropy energy increased. Therefore it can be said that first and third harmonic signals can be used in determining the micro-structural state of ferromagnetic materials for a nondestructive testing method. The micro-structure of the steel plate was qualitatively analyzed by comparing the contrast of two-dimensional gray level images obtained by scanning through a hole defect made artificially and black lines on a steel plate. The two-dimensional gray level images were obtained by detecting the first and third harmonic signals generated in a single core active induction coil in the course of scanning the surface of specimens. The results indicated that this method can be applied to the on-line monitoring for whole surface inspection of steel plate. A new method suitable for a single core flux-gate magnetometer has been developed. The method makes use of the coupling property of odd and even harmonics generated by the self-product of induced voltage during the magnetization of ferromagnetic material by an external field superposed on the AC driving magnetic field. The power difference between the two half-periods of magnetization was expressed by the coupling of odd and even harmonics, which was found to be proportional to the external field under the condition that $H_{ext}l《 H_{AC}$, where $H_{ext}$ and $H_{AC}$ are the external magnetic field and AC driving field amplitude, respectively. This method provides a linearity in the wide external field range, high sensitivity, good reproducibility and also provides the vector detection without phase detection.

서지기타정보

서지기타정보
청구기호 {DPH 96028
형태사항 xii, 147 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Chung-Sam Jun
지도교수의 한글표기 : 남창희
공동교수의 한글표기 : 김호철
지도교수의 영문표기 : Chang-Hee Nam
공동교수의 영문표기 : Ho-Chul Kim
수록잡지명 : "A new method for fluxgate magnetometers using the coupling property of odd and even harmonics". Measurement Science and Technology. IOP Publishing Ltd, vol.6, pp.898-903 (1995)
학위논문 학위논문(박사) - 한국과학기술원 : 물리학과,
서지주기 참고문헌 : p. 141-147
주제 자기 이력
조화파
능동형 유도 코일
비파괴 검사
프락스 게이트 마그네토미터
Magnetic hysteresis
Harmonics
Active induction coil
NDT
Fluxgate(Flux-gate) magnetometer
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