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Temperature compensated fiber optic current or magnetic field sensor with insensitivity to variations in sensor parameters

A magnetic field sensor, fiber optic current technology, applied in the direction of electromagnetic field characteristics, voltage/current isolation, measuring current/voltage, etc.

Active Publication Date: 2011-05-18
ABB POWER GRIDS SWITZERLAND AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this type of coil there can be a greater amount of fiber birefringence, causing a birefringent phase delay of eg δ = 5...25°

Method used

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  • Temperature compensated fiber optic current or magnetic field sensor with insensitivity to variations in sensor parameters
  • Temperature compensated fiber optic current or magnetic field sensor with insensitivity to variations in sensor parameters
  • Temperature compensated fiber optic current or magnetic field sensor with insensitivity to variations in sensor parameters

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Embodiment Construction

[0069] sensor design

[0070] The working principle of the fiber optic current sensor as described in [1] is in figure 1 depicted in . Two orthogonal linearly polarized light waves are sent from the control unit 1 to the sensing head through a connecting polarization maintaining fiber (pm fiber) 2 , generally indicated at 3 . The sensor head 3 includes an optical retarder 4 , a sensor fiber 5 and a reflector 7 .

[0071] The retarder 4 is eg a fiber optic retarder with an elliptical core and serves to switch between linearly polarized light in the pm fiber 2 and elliptically polarized light in the sensing fiber 5 . It has two principal axes and its delay is adapted to induce a phase shift of π / 2+ε between light waves polarized along its principal axes, where ε is an additive non-zero phase shift.

[0072] The sensing fiber 5 is looped N>0 times around one or more current conductors 6 carrying the current I to be measured. In this embodiment, the reflector 7 is arranged at ...

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Abstract

The name of the invention is: temperature compensated fiber optic current or magnetic field sensor with insensitivity to variations in sensor parameters. A fiber optic current or magnetic field sensor uses a sensing fiber in a coil for measuring a current or a magnetic field and has a retarder for converting between linearly polarized light and elliptically polarized light. The retardation of the retarder; its temperature dependence as well as its azimuth angle in respect to the plane of the fiber coil are optimized in dependence of the birefringence in the sensing fiber in order to minimize the influence of temperature variations and manufacturing tolerances on the overall scale factor of the sensor.

Description

technical field [0001] The present invention relates to fiber optic current sensors (FOCS) or magnetic field sensors comprising sensing fibers exposed to a magnetic field such as a current to be measured. This type of sensor is typically used in high voltage or high current applications. Background technique [0002] Fiber optic current sensors (FOCS) typically rely on the Faraday effect in fused silica fibers. The Faraday effect varies with temperature. The Verdet constant for fused silica fibers (which is a measure of the Faraday effect) is based on Variation, ie sensor signal variation within 0.84% ​​over an operating temperature range of eg -40°C to +80°C. However, many applications of the sensor require accuracy within ±0.2% or ±0.1%, thus requiring measures for temperature compensation. In EP1107029, EP1115000 and reference [1], methods for intrinsic temperature compensation of the Faraday effect in interferometric Sagnac and reflective fiber optic current sensors...

Claims

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Application Information

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IPC IPC(8): G01R15/24G01R19/00G01R29/08
CPCG01R15/246G01R33/0322
Inventor R·韦斯特A·弗兰克K·博纳特
Owner ABB POWER GRIDS SWITZERLAND AG
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