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단전류 - 다층 솔레노이드 방법을 사용한 저자장 표준시스템 제작
박포규(Po Gyu Park),김영균(Young Gyun Kim),V. Ya. Shifrin(V. Ya. Shifrin),V. N. Khorev(V. N. Khorev) 한국자기학회 2001 韓國磁氣學會誌 Vol.11 No.1
The magnetic field standard below 1 mT with the resolution of 0.26 nT has been established. Earth magnetic field (EMF) is compensated automatically down to 0.1 nT/10 min. by a closed feedback system with Cs optical pumping magnetometer and 3-axis Helmholtz coils in nonmagnetic facilities. A multi-layer precision solenoid with the optimized single-current method generates the uniform magnetic field better than 1.0×10^(-7) within ±1 ㎝ region at its center. The coil constant of solenoid determined from Helium optical pumping magnetometer is 1.231 0589 mT/A, and temperature coefficient is 0.38 nT/℃. This standard system is used for calibration of low field magnetometers and testing relates to low field.
Elliptical 함수, Legendre 다항식을 이용한 단층, 다전류 솔레노이드의 자장균일도 비교
정정효(Jung Hyo Jung),박포규(Po Gyu Park),김윤배(Yoon Bae Kim),V. Ya. Shifrin(V. Ya. Shifrin),V. N. Khorev(V. N. Khorev) 한국자기학회 1999 韓國磁氣學會誌 Vol.9 No.5
The magnetic field in single-layer solenoid with multi-current is calculated using Elliptical function, Legendre polynomials and Biot-Savart law. The optimization conditions to a highly uniform magnetic field in the center of solenoid has been studied. The variation of magnetic field depending on radius difference was examined. The uniformity of magnetic field is compared with that obtained each multi-current method. The five-current method increases the working space within 0.02 ppm uniformity by eighty times that using single current method. And this method improves the magnetic field uniformity which is equivalent to the effect of 160 m long solenoid by using single current.
Shifrin, V Ya,Khorev, V N,Rasson, J,Park, Po Gyu Springer-Verlag 2014 METROLOGIA -BERLIN- Vol.51 No.-
<P>The international comparisons in the field of earth-level dc magnetic flux density measurements with the participation of six National Metrology Institutes (NMIs) and four geomagnetic observatories (GMOs) have been carried out in 2013 and 2014 under the auspices of the Regional Metrology Organization Asia Pacific Metrology Programme (APMP). The obtained expanded uncertainty (k = 2) of the weighted mean value of correction values does not exceed 0.1 nT in the range of 20 μT to 100 μT, which was one of the main aims of this comparison. VNIIM (D I Mendeleyev Institute for Metrology) was the pilot laboratory for this comparison registered in the Key Comparison Data Base (KCDB) under index APMP.EM-S14. </P><P>Main text.To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database kcdb.bipm.org/.</P><P>The final report has been peer-reviewed and approved for publication by the CCEM, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).</P>
Shifrin, V.Ya.,Khorev, V.N.,Shilov, A.E.,Park, Po Gyu IEEE 2005 IEEE transactions on instrumentation and measureme Vol.54 No.2
A wide-range low-permanent-field standard measurement system is described, intended for use within the geomagnetic range of natural magnetic fields on the earth's surface (20-100 μT), fields of near and distant outer space (0.1-20 μT), and precision current-carrying high-uniform-field coil systems used in fundamental and applied research (up to 1.5 mT).
Magnetic Flux Density Standard Based on the Proton Gyromagnetic Ratio
PoGyuPark,Y.G.Kim,V.Ya.Shifrin,V.N.Khorev 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.42 No.6
The proton gyromagnetic ratio ($\gamma^\prime_P$) plays a fundamental role in achieving highly accurate magnetic-field measurements. At the Korea Research Institute of Standards and Science (KRISS) complex for the determination of the proton gyromagnetic ratio, we have improved a magnetic-field standard based on the value of $\gamma^\prime_P$ and related techniques. The standard for measuring the static magnetic flux density has been intended to cover the range from 20 $\mu$T to 2.5 T, with an uncertainty ranging from 4 $\times$ 10$^{-6}$ to 6 $\times$ 10$^{-5}$ T.