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Over 40 years ago it was recognized that the Faraday effect in optical fibers could be the basis of a new, and better, technology for current measurement.
A fiber optic current sensor (FOCS) is a current sensor for measuring direct current. By using a single-ended optical fiber around the current conductor that utilizes the magneto-optic effect (Faraday effect), FOCS measures uni- or bidirectional DC currents of up to 600 kA within ±0.1% of the measured value. :2. Because it
in high dc current measurement. ABB's new fiber-optic current sensor (FOCS) for the electro-winning industry. Klaus Bohnert. Peter Guggenbach. Current measurement systems within the electro-winning industry are a necessity. Traditionally the measure- ment of dc currents up to 500 kA requires highly sophisticated
In the fiber-optic current sensor a simple loop of optical fiber around the bus bar fiber-optic current sensor (FOCS) is a spin off from a sensor developed for high-voltage substations and opens totally new perspectives in the field of high current DC converter systems as well as a stand-alone device. Build-in self-test
Jan 4, 2018 New current sensing principles based on either established techniques such as Hall-effect sensors and fluxgate principles or emerging technologies such as magneto resistance effect and fiber-optical techniques provide attractive alternatives for current sensing, although generally at a higher price than
Jun 15, 2016 Back to Top; Get PDF. Abstract. We demonstrate a method for self-compensation of scale factor changes of an interferometric fiber-optic current sensor caused by source wavelength shifts, e.g., due Inherent temperature compensation of fiber-optic current sensors employing spun highly birefringent fiber.
This paper investigates the possibility of instead using a Faraday effect-based opto-magnetic field sensor technique for fault detection in IGBT-switched current lines. Firstly, possible techniques, optical and non-optical, are reviewed with a special focus on optical sensing techniques. An optical sensing technique using a
An optical-fiber sensor based on Faraday Effect is developed for measuring total lightning electric current. It has many unique capabilities not possible with traditional current sensors. Designed for aircraft installation, the sensor is light- weight, non-conducting, structure-conforming, and is immune to electromagnetic
Oct 10, 2013 Keywords: Faraday rotation; plastic optical fibre; optical fibre sensors; current sensor. 1. Optical current transformers based on optical fibre sensors are now being developed worldwide [1–4]. . accommodate the electric signal to the analog to digital converter (ADC) when the current through the.
ABB Fiber-Optic Current Sensors (FOCS) for the measurement of high DC currents such as in aluminum and magnesium smelters, dc arc furnaces or other.

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February 2018