Optical Fiber Current Sensors Using Garnet Crystal for Power Distribution Fields

Ishizuka, Satoshi; Itoh, N.; Minemoto, H.

doi:10.1364/ofs.1996.ex31

Cited by 2 publications

(5 citation statements)

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“…2. Due to the Bi 3+ ions substitution, the Faraday rotation of (BiYbY) 3 (FeGa) 5 The transmission spectrum measured in the near-infrared region of 800 nm to 2600 nm has been measured using a Hitachi U-3410 two-beam spectrometer. No antireflection coating was applied onto the slice surfaces.…”

Section: Resultsmentioning

confidence: 99%

“…The single crystal garnet (BiYbY) 3 (FeGa) 5 in a single crystal growth furnace in which the crucible can be rotated and accelerated in positive and negative directions. After being kept at the highest temperature for several hours, the melts were slowly cooled down to 980 at a cooling rate of 0.5~3 /h.…”

Section: Methodsmentioning

confidence: 99%

“…Such sensors are supposed to be the most promising substitutions of traditional current transformers (CTs) [1]. With recent developments in optical current/magnetic sensors utilizing the Faraday rotation effect, there has been considerable demand for applying these sensors to electric power systems such as power delivery systems to measure current, and to monitor the condition of these lines [2]- [5], which in turn generally require that the sensing materials have the large Faraday rotation, high sensitivity constant, high accuracy, low temperature dependence of the sensitivity, high magneto-optical figure of merit and suitable saturation magnetic field.…”

Section: Introductionmentioning

confidence: 99%

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Faraday Rotation and Sensitivity of Bi-Substituted Iron Garnet Single Crystal for Optical Current/Magnetic Field Sensors

Huang

Ling

2009

2009 Asia-Pacific Power and Energy Engineering Conference

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This paper is concerned with the preparation and magneto-optic characterization of the Bi-substituted rare earth ferrite garnet bulk single crystal of (BiYbY) 3 (FeGa) 5 O 12 .Here we focus our studies on improving the sensitivity constant and its temperature dependence of iron garnet for optical current/magnetic sensors through compositional modification. Due to the Bi 3+ ions substitution, the specific Faraday rotation of Bi 0.75 Yb 1.02 Y 1.23 Fe 4.72 Ca 0.28 O 12 crystal under saturation magnetic field was enhanced greatly to be about -161.7 0 /mm and -144.1 0 /mm at λ=1310 nm and 1550 nm respectively. Magneto-optic figure of merit is 87.6 0 /dB at λ=1550 nm and room temperature. The smaller Faraday rotation temperature coefficient (FTC) of 3.99×10 -5 /K at λ=1550 nm have been obtained owing to the compensation effect. The sensitivity have been enhanced by a factor of 24 with respect to pure YIG, given the same sensor length and demagnetization factor, by substituting Bi ions into Y sites and substituting diamagnetic Ca ions into Fe sites in YIG. These results suggest that the new garnet composition is a highperformance material suitable for current/magnetic-field sensors.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Faraday Rotation and Sensitivity of Bi-Substituted Iron Garnet Single Crystal for Optical Current/Magnetic Field Sensors

Huang

Ling

2009

2009 Asia-Pacific Power and Energy Engineering Conference

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“…In these measurements, the LBM were obtained from the extinction ratio of the transmitted light or by using a Babinet-Soleil compensator. After the analysis using an optical indicatrix of the magnetized crystal, these measurement results for a cubic system as Ce:YIG crystals are described well by following equations [5], [6], (1) where and are the magnitude and anisotropy parameters of the LMB, respectively. is the angle between the direction of the magnetic field and the axis in the (011) in Fig.…”

Section: Lmb In Ce:yig and Its Influence On Linearitymentioning

confidence: 99%

“…W ITH RECENT developments in optical magnetic field (current) sensors utilizing the Faraday effect, there has been considerable demand for applying these sensors to electric power systems [1]. In these sensors, a Bi-substituted rare-earth iron garnet film is used as a Faraday element.…”

Section: Introductionmentioning

confidence: 99%

Magnetic field sensors using Ce:YIG single crystals as a Faraday element

Kamada

Higuchi

2001

IEEE Trans. Magn.

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In this paper, magnetic field sensors based on creation of the Faraday effect by rotation magnetization in Ce:YIG crystals are studied. The large linear magnetic birefringence (LMB) of 1 = 1 7 10 4 was observed in the Ce 0 18 Y 2 82 Fe 5 O 12 crystal and it was found from both the calculation and experimental investigations that the LMB affects the linearity of the sensor output. The validity of the method of utilizing a pair of Ce:YIG crystals with an azimuthal angle of 90 deg in the optical axis is demonstrated as a method of improving these phenomena.Index Terms-Ce:YIG single crystal, linear magnetic birefringence, magnetic field optical sensor, the Faraday effect.

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Optical Fiber Current Sensors Using Garnet Crystal for Power Distribution Fields

Cited by 2 publications

References 0 publications

Faraday Rotation and Sensitivity of Bi-Substituted Iron Garnet Single Crystal for Optical Current/Magnetic Field Sensors

Faraday Rotation and Sensitivity of Bi-Substituted Iron Garnet Single Crystal for Optical Current/Magnetic Field Sensors

Magnetic field sensors using Ce:YIG single crystals as a Faraday element

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