公开(公告)号：US10481182B2

公开(公告)日：2019-11-19

申请号：US15434747

申请日：2017-02-16

Applicant: ABB Schweiz AG

Inventor： Georg Müller ,  Klaus Bohnert ,  Andreas Frank ,  Lin Yang

IPC: G01R15/24

Abstract: There is described an optical fiber current sensor having an opto-electronic module part for detecting an optical phase shift induced by the measurand field in a sensing fiber, a sensor head including the sensing fiber, wherein the sensing fiber is a spun highly-birefringent fiber having a length L=∫ ds defined by the line integral along the space curve given by the sensing fiber coil such that the length L of the sensing fiber is sufficiently long to suppress thermal signal instabilities due to the spun character of the sensing fiber while the effective number of fiber windings is low enough to maintain a maximum sensitivity over the full measurement range of the fiber-optical sensor.

公开(公告)号：US20170315158A1

公开(公告)日：2017-11-02

申请号：US15650361

申请日：2017-07-14

Applicant: ABB Schweiz AG

Inventor： Georg Müller ,  Klaus Bohnert ,  Andreas Frank ,  Yang Lin

IPC: G01R15/24 ,  G02B6/02 ,  G02B6/10

CPC classification number: G01R15/246 ,  G02B6/02333 ,  G02B6/02347 ,  G02B6/105

Abstract: It is proposed to use a spun birefringent fiber for a current sensor or magnetic field sensor. The fiber has a birefringence that increases with temperature. In this case, the temperature dependence of the fiber's sensitivity to magnetic fields counteracts the temperature dependence of the fiber's Verdet constant, which allows to design current and field sensors that have reduced temperature dependence.

公开(公告)号：US10466278B2

公开(公告)日：2019-11-05

申请号：US15650361

申请日：2017-07-14

Applicant: ABB Schweiz AG

Inventor： Georg Müller ,  Klaus Bohnert ,  Andreas Frank ,  Yang Lin

IPC: G01R15/24 ,  G02B6/02 ,  G02B6/10

Abstract: It is proposed to use a spun birefringent fiber for a current sensor or magnetic field sensor. The fiber has a birefringence that increases with temperature. In this case, the temperature dependence of the fiber's sensitivity to magnetic fields counteracts the temperature dependence of the fiber's Verdet constant, which allows to design current and field sensors that have reduced temperature dependence.

公开(公告)号：US20190195921A1

公开(公告)日：2019-06-27

申请号：US16275939

申请日：2019-02-14

Applicant: ABB Schweiz AG

Inventor： Georg Müller ,  Klaus Bohnert ,  Andreas Frank ,  Philippe Gabus

IPC: G01R15/24 ,  G01R19/32

CPC classification number: G01R15/241 ,  G01R15/246 ,  G01R15/247 ,  G01R19/32

Abstract: A fiber optic sensor and related method are described, with the sensor including a cross-coupling element in the optical path between a polarizing element and a sensing element, but separated from the sensing element itself; with the cross-coupling element generating a defined cross-coupling between the two orthogonal polarization states of the fundamental mode of a polarization maintaining fiber guiding light from the light source to the sensing element thus introducing a wavelength-dependent or temperature-dependent sensor signal shift to balance wavelength-dependent or temperature-dependent signal shifts due to other elements of the sensor, particularly signal shifts due to the wavelength dependence of the Faraday effect or the electro-optic effect constant.

公开(公告)号：US20170160315A1

公开(公告)日：2017-06-08

申请号：US15434747

申请日：2017-02-16

Applicant: ABB Schweiz AG

Inventor： Georg Müller ,  Klaus Bohnert ,  Andreas Frank ,  Lin Yang

IPC: G01R15/24

CPC classification number: G01R15/245 ,  G01R15/246

Abstract: There is described an optical fiber cuing sensor having an opto-electronic module pan (10-2) for detecting an optical phase shift induced by the measurand field in a sensing fiber (12), a sensor head (10-1) including the sensing fiber (12), wherein the sensing fiber (12) is a spun highly-birefringent fiber having a length L=∫ds defined by the line integral along the space curve given by the sensing fiber coil such that the length L of the sensing fiber (12) is sufficiently long to suppress thermal signal instabilities due to the spun character of the sensing fiber (12) while the effective number of fiber windings is low enough to maintain a maximum sensitivity over the full measurement range of the fiber-optical sensor (10).