公开(公告)号：US11047885B2

公开(公告)日：2021-06-29

申请号：US16253755

申请日：2019-01-22

Applicant: ABB Power Grids Switzerland AG

Inventor： Klaus Bohnert ,  Andreas Frank ,  Yang Lin ,  Xun Gu ,  Georg Müeller

IPC: G01R15/24 ,  G01R19/32

Abstract: The optical interferometric sensor device comprises an integrated beam splitter having a first facet and a second facet with optical ports arranged therein. On the beam splitter, the beam splitting junctions as well as the optoelectronics-side ports and the sensing-side port are arranged with a mutual displacement along the direction of the first facet. This displacement reduces undesired interference effects caused by stray light. Also, a quarter-wave retarder is provided in a recess of the beam splitter with layers of soft adhesive adjacent to it in order to reduce stress.

公开(公告)号：US20210116641A1

公开(公告)日：2021-04-22

申请号：US17041098

申请日：2019-04-02

Applicant: ABB Power Grids Switzerland AG

Inventor： Xun Gu ,  Philippe Gabus

IPC: G02B6/255 ,  G01R15/24 ,  G01R19/00

Abstract: The invention relates to a spliced optical fiber comprising a first and second polarization-maintaining optical fiber connected at ends by splicing; to fiber optic current sensors; and to a method for protecting the spliced optical fiber against mechanical stress and/or humidity. A protection tube is arranged around the spliced optical fiber in a splice section of the spliced optical fiber. A first and second end of the protection tube is sealed to the spliced optical fiber by first and second sealing arrangement for protecting the splice.

公开(公告)号：US10725073B2

公开(公告)日：2020-07-28

申请号：US15243713

申请日：2016-08-22

Applicant: ABB Power Grids Switzerland AG

Inventor： Xun Gu ,  Sergio Vincenzo Marchese ,  Klaus Bohnert ,  Andreas Frank

IPC: G01R15/24 ,  G01D5/26 ,  G01D5/353

Abstract: An interferometric sensor and related methods are provided, with a sensing element whereby a measurand induces a relative phase shift between two waves, at least one detector measuring an interference signal between the two waves, and further including a phase shift detection unit having as input the interference signal and determining a first measure representative of the principal value of the relative phase shift, and a contrast detection unit having as input the interference signal for determining a second measure representative of the cross-correlation between the two waves, and a further a processing unit for converting the first and second measures to a measurand value.