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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.
Po Gyu Park,Kyu-Tae Kim,Mun-Seog Kim,Vladlen Ya. Shifrin,Wan-Seop Kim,Young Gyun Kim 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.47 No.4
A system for automatic compensation of the Earth’s magnetic field and precise generation of a low magnetic-flux-density was developed on the basis of Cs and He-Cs atomic-magnetic-resonance magnetometers in nonmagnetic facilities. The permanent and time-varying components of the Earth’s magnetic field were compensated for by using Helmholtz coils and a Cs magnetic-field controller. Also, a thermo-compensation was applied to reduce drift of the magnetic flux density in the coil. A precision quartz solenoid and atomic-magnetic-resonance current source were used to generate a standard magnetic flux density. The standard deviation of the generated magnetic flux density was 0.02 nT for 1 to 60 s with a drift of the Earth’s magnetic field of 0.1 nT for 1 h in the range of 20 μT to 1.2 mT.