• 한국입자에어로졸학회지
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• 제8권1호
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• pp.29-35
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• 2012

The Faraday cup electrode of different size has been developed and evaluated to investigate the diffusion effect of particles by Brownian motion in a particle beam mass spectrometer(PBMS). Particles which focused and accelerated by aerodynamic lens are charged to saturation in an electron beam, and then deflected electrostatically into a Faraday cup detector for measurement of the particle current. The concentration of particles is converted from currents detected by Faraday cup. Measurements of particle current as a function of deflection voltage are combined with measured relationships between particle velocity and diameter, charge and diameter, and mass and diameter, to determine the particle size distribution. The particle currents were measured using 5, 10, 20, 40 mm sized Faraday cup that can be move to one direction by motion shaft. The current difference for each sizes as a function of position was compared to figure out diffusion effect during transport. Polystyrene latex(PSL) 100, 200 nm sized standard particles were used for evaluation. The measurement using 5 mm sized Faraday cup has the highest resolution in a diffusion distance and the smaller particles had widely diffused.

• 한국광학회지
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• 제6권4호
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• pp.352-358
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• 1995

$Tb^{3+}$이온이 첨가된 Hoya FR5 유리와 $Ce^{3+}$이론이 첨가된 Hoya FR4 유리의 Faraday 회전과 자기화를 4.2K-10K 저온 영역에서 자기장을 80kG까지 증가시키면서 온도 T와 자기장 H의 함수로 측정하였다. 사용파장은 아르곤 레이저의 514.5nm였다. H/T> $5kG.K^{-1}$ 이상에서 나타난 자기화 및 Faraday 회전의 포화현상을 상자성체 양자이론으로 해석할 수 있었다. 계산된 맺음변수들로부터 $Ce^{3+}$ 유리의 큰 Verdet 상수는 $4f\rightarrow5d$궤도 유효 전기쌍극자 전이효과에 기인되고 $Tb^{3+}$ 유리의 큰 Verdet 상수는 자기화에 기인됨을 알 수 있었다.

• Current Optics and Photonics
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• 제4권2호
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• pp.134-140
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• 2020

A significant enhancement of the magneto-optical Faraday rotation and extraordinary optical transmission (EOT) in the cascaded double-fishnet (CDF) structure with periodic rectangular apertures is theoretically predicted by using the extended finite difference time domain (FDTD) method. The results demonstrate that the transmittance spectrum of the CDF structure has two EOT resonant peaks in a broad spectrum spanning visible to near-infrared wavebands, one of them coinciding with the enhanced Faraday rotation and large figure of merit (FOM) at the same wavelength. It is most important that the resonant position and intensity of the transmittance, Faraday rotation and FOM can be simply tailored by adjusting the incident wavelength, the thickness of the magnetic layer, and the offset between two metallic rectangular apertures, etc. Furthermore, the intrinsic physical mechanism of the resonance characteristics of the transmittance and Faraday rotation is thoroughly studied by investigating the electromagnetic field distributions at the location of resonance. It is shown that the transmittance resonance is mainly determined by different hybrid modes of surface plasmons (SPs) and plasmonic electromagnetically induced transparency (EIT) behavior, and the enhancement of Faraday rotation is mostly governed by the plasmonic electromagnetically induced absorption (EIA) behavior and the conversion of the transverse magnetic (TM) mode and transverse electric (TE) mode in the magnetic dielectric layer.

• 조명전기설비학회논문지
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• 제24권11호
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• pp.9-16
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• 2010

This paper examines the temperature characteristics of an Optical CT (optical current transformer) using the Faraday effect for measuring high current in a super high voltage-power apparatus. It is performed as follows by the sensor for embodying Faraday effect. $\cdot$ A single-mode optical fiber capable of maintaining a polarization state is used. $\cdot$ A light source is applied at 1310[nm] to a Laser Diode. $\cdot$ The Linear of Faraday effect to a large current is evaluated and $\cdot$ A possible application using an Optical CT was shown. An Influence of Faraday effect to the surrounding temperature measured -40~50[$^{\circ}C$], and the characteristic of the current sensitivity was reported. An application using the results of the temperature compensation system was used in order to compensate for surrounding temperatures. A possibility of applying Optical CT for electric power apparatus was advanced further. We were able to confirm that this temperature calibration method can minimize the fluctuation of the output signal depending on the temperature conditions.

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2002년도 학술대회논문집
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• pp.97-101
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• 2002

The optical current transformer using Faraday effect is the sensor to measure current that flows in any conductor. This sensor doesn't undergo the magnetic saturation and effect of adjacent conductors. But this senor using bulk-glass sensing element has crucial drawback. It is impossible that the sensor is mounted to conductor without breaking the closed-loop of light or conductor. So we developed the clamp-type optical current transformer and made an experiment.

• 산업기술연구
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• 제21권A호
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• pp.351-355
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• 2001

This research was carried out to find out the possibility of using Faraday's law in analyzing the electrocoagulation system. Bench-scale reactor equipped with aluminum electrode plates was operated using synthetic wastewater which received sodium chloride for conductivity adjustment. Phosphate was added to the wastewater to induce the precipitation with Al. The amount of aluminum dissolved from the electrodes could be predicted by Faraday's law with a difference less than 5%. This difference was greater at a higher electric current, probably due to the increased solution temperature. However, effect of pH on the dissolution of the aluminum was negligible. The result of this study suggested that the operating condition of electrocoagulation system could be developed using the Faraday's law when the pollutant concentration is given.

• 센서학회지
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• 제28권3호
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• pp.187-190
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• 2019

We proposed and demonstrated DC(direct current) optical current sensor based on Faraday effect for HVDC(high voltage direct current). The RIG((Bi1.3Gd0.43Y1.27)Fe5O12) was adopted as Faraday device because of its high Verdet constant and good thermal stability. The differential amplification scheme for signal processing was present. The sensor showed high linear response for the input current. Measurement range of the sensor was 0~200A and measurement error was less than 1%.

• 조명전기설비학회논문지
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• 제17권6호
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• pp.72-76
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• 2003

편광분석법을 이용한 광섬유형 전류센서를 구성하여 다양한 전류측정 실험을 행하였다. 잔존 선형복굴절의 영향을 최소화하기 위하여 광섬유 센서 코일의 한쪽 끝에 Faraday 미러를 장착하였으며 일반적인 미러를 사용하는 경우와 출력의 안정성을 비교분석 하였다. 센서코일에 변형을 가하는 경우나 장시간에 걸친 안정성 실험에서도 Faraday 미러를 사용하는 경우에 출력의 안정성이 현저하게 증가함을 알 수 있었다.

• 조명전기설비학회논문지
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• 제17권6호
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• pp.60-65
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• 2003

본 논문에서는 Faraday 효과를 이용한 클램프형 구조의 광-전류 변류기 헤드 설계시에 고려해야할 조건을 이론적으로 해석하고, 이를 토대로 한 클램프형 광-전류 변류기 헤드를 제작하여, 도선에 흐르는 전류, 광의 입사각에 따른 광출력의 변화 및 감도를 측정하고 분석함으로써 전류계로서의 가능성을 입증하였다.

• 한국광학회:학술대회논문집
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• 한국광학회 2009년도 동계학술발표회 논문집
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• pp.223-224
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• 2009