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：US20180238934A1

公开(公告)日：2018-08-23

申请号：US15953876

申请日：2018-04-16

Applicant: ABB Schweiz AG

Inventor： Klaus Bohnert ,  Philippe Gabus

IPC: G01R15/24 ,  G01R19/00

CPC classification number: G01R15/247 ,  G01R15/246 ,  G01R19/0092

Abstract: A fiber-optic current sensor includes an opto-electronics module, a sensor head and a connecting fiber connecting the opto-electronics module to the sensor head. The sensor includes a first and a second beam splitter, between which the measuring light runs in two branches. One fiber connector is arranged in each branch, for connecting a cable assembly to the opto-electronics module. The optical path lengths between the two connectors and the second beam splitter are different, such that light waves cross-coupled into an orthogonal polarization mode due to angular misalignment of the connectors become incoherent with the non-cross-coupled waves returning from the sensor head.