An Absolute Electric Current Probe Based on the Faraday Effect

Caton, William M.; Katzenstein, J.

doi:10.6028/jres.089.015

Cited by 4 publications

(1 citation statement)

References 8 publications

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“…The realization of a current sensor using bulk glass based on the Faraday effect has been widely studied [1][2][3][4][5][6][7][8][9]. The vast majority of optical configurations proposed are intended for use on high-voltage, highpower transmission lines.…”

Section: Introductionmentioning

confidence: 99%

Current measurement by Faraday effect on GEPOPU

et al. 2012

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The design of an optical current sensor to be used in a pulsed power generator is presented. The current sensor is based on the polarization rotation by the Faraday effect. GEPOPU is a pulsed power generator, 110 kA, 120 ns double transit time, 1.5 Ω coaxial geometry, and current rise time of 50 ns. Two different optical geometries surrounding the conductor were tried, using Amici roof prism and pentaprism to go around the current once, as a way to preserve the state of polarization along the optical path by means of complementary reflections within the sensing element. We believe this to be the first time that such large and rapidly varying currents have been measured with this configuration. The values obtained for both geometries agree with the values obtained with a Rogowski coil. The traces obtained are completely noise-free and no significant time lag has been observed between the current determined from the Faraday rotation and the current measured using a Rogowski coil.

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Section: Introductionmentioning

confidence: 99%

Current measurement by Faraday effect on GEPOPU

et al. 2012

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Simplified high-current measurement probe based on a single-mode optical fiber

Dey

Shukla

Sharma

2018

Review of Scientific Instruments

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A “fiber optic cable tester” of 658 nm wavelength has been used to launch a linearly polarized light to the twisted single mode optical fiber of the designed mega-ampere current measurement probe. Modulated intensity variation of light has been converted to the corresponding electrical signal using a fast photodetector assembly having 100 nS rise-time. The effect of undesired linear birefringence has been overcome by manually twisting the fiber at a twist rate of 40 twists per meter. The sensitivity of the designed probe is 0.247° polarization rotation/kA current-turn product, for a single optical fiber loop.

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High magnetic field measurement utilizing Faraday rotation in SF11 glass in simplified diagnostics

2017

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With the commercialization of powerful solid-state lasers as pointer lasers, it is becoming simpler nowadays for the launch and free-space reception of polarized light for polarimetric applications. Additionally, because of the high power of such laser diodes, the alignment of the received light on the small sensor area of a photo-diode with a high bandwidth response is also greatly simplified. A plastic sheet polarizer taken from spectacles of 3D television (commercially available) is simply implemented as an analyzer before the photo-receiver. SF11 glass is used as a magneto-optic modulating medium for the measurement of the magnetic field. A magnetic field of magnitude more than 8 Tesla, generated by a solenoid has been measured using this simple assembly. The measured Verdet constant of 12.46 rad/T-m is obtained at the wavelength of 672 nm for the SF11 glass. The complete measurement system is a cost-effective solution.

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An Absolute Electric Current Probe Based on the Faraday Effect

Cited by 4 publications

References 8 publications

Current measurement by Faraday effect on GEPOPU

Current measurement by Faraday effect on GEPOPU

Simplified high-current measurement probe based on a single-mode optical fiber

High magnetic field measurement utilizing Faraday rotation in SF11 glass in simplified diagnostics

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