Abb Research Ltd.

Sensirion Ag

Robert Wüest

Klaus Bohnert

Mark Hornung

Andreas Frank

Philippe Gabus

Matthias Merz

Matthias Studer

Gijs Van Steenwijk

Harry Figi

Dominikus Kölbl

Cyrill Kümin

A fiber-optic current sensor includes a measuring unit having a light source and a light detector, and a sensing head having a sensing fiber wound around a conductor and a retarder connected to the sensing fiber. The scale factor as a function of current of the fiber-optic current sensor is described by the product of two scaling functions fe' and fs&#x2032; for the measuring unit and the sensing head, respectively. The data describing the scaling functions fe&#x2032;, fs&#x2032; is stored in a memory of the measuring unit, while the data describing the scaling function fs&#x2032; is also stored in a memory of the sensing head. Providing two such memory devices allows to store the scaling functions fe&#x2032; and fs&#x2032; separately, thereby turning the control unit as well as the sensor head into easily replaceable modules.

Fiber-optic current sensing using a sensor with exchangeable sub-modules

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Zurich, Switzerland

Robert Wüest