US 7,466,118 B2Granted

Compensation of simple fibre optic Faraday effect sensors

AssigneePowersense A/S

InventorLars Nørgaard Bjørn

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Abstract

An electric current measurement device includes a housing defining first and second open ends sealed by first and second sealing means, respectively; a first optical fibre received in an aperture in the first sealing means and in optical communication with a first optical lens in the housing; a first polarisation filter in the housing in optical communication with the first lens; a magneto-optical rod within the housing in optical communication with the first polarisation filter; a second polarisation filter in the housing in optical communication with the rod; and a second optical lens in the housing in optical communication with the second polarisation filter. The second sealing means has an aperture for receiving a second optical fibre fixed to the second lens. First and second lids, attachable to the first and second housing ends, respectively, include apertures for receiving the first and second optical fibres, respectively.

Claims3

Dependent claims

A method of calibrating a current measuring device for measuring high voltage current in an electrical conductor, said method comprising:

disposing a current measuring system in an operative relationship with the electrical conductor;
disposing a Faraday effect current measurement device in an operative relationship with the electrical conductor, the current measurement device having first and second ends;
providing an optical conduit having first and second ends, and connecting the second end of the optical conduit to the first end of the current measurement device;
emitting light from a light source into the first end of the first optical conduit so that the light is received by the current measurement device from the second end of the first optical conduit;
connecting a first end of a second optical conduit to the second end of said current measurement device;
connecting to the second end of the second optical conduit an optical detection means for converting said light to a first electrical signal;
measuring the current in said electrical conductor with the current measurement system and providing a second electrical signal having a value indicative of the current in the electrical conductor;
and
calculating a calibration constant by comparing the first and second electrical signals.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 11/382,656Filed 10 May 2006 · division
Priority: EP 0301059412 May 2003
Published: US 2006/0232260 A119 Oct 2006
Granted: 16 Dec 2008
Term ends: Not estimatedThe source records don’t support an estimate.

Classification3 codes

G01R 15/246
Using magneto-optical modulators, e.g. based on the Faraday or Cotton-Mouton effect: based on the Faraday, i.e. linear magneto-optic, effect
G01R 35/005
Testing or calibrating of apparatus covered by the other groups of this subclass: calibrating; Standards or reference devices, e.g. voltage or…
G01R
Measuring electric variables

Family

Application60/471,551Us provisional application · filed 19 May 2003
PCT/DK2004/000337Parent of this continuation · filed 12 May 2004
Application10/849,507Parent of this division · filed 19 May 2004
US 2006/0232260 A1Pre-grant publication · published 19 Oct 2006
US 7,068,025 B2Parent of this division
Application10/849,507Parent of this continuation
US 2005/0007092 A1Published application
US 7,466,118 B2This patent

From the US filing history. Foreign family members aren’t listed.

Timeline

Citations

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