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公开(公告)号：US20180080958A1
公开(公告)日：2018-03-22
申请号：US15708968
申请日：2017-09-19
Applicant: ABB Schweiz AG
Inventor： Sergio Vincenzo Marchese , Xun Gu , Burak Büyükkavir , Klaus Bohnert , Tobias Erford
IPC: G01R15/24
Abstract: The invention relates to an assembly of a gas-tight compartment and an optical voltage sensor that further comprises a module. The module comprises an electro-optic crystal and electrodes, wherein the electro-optic crystal is the only element of the module to mechanically connect the two electrodes and to bridge the potentials of the two electrodes. The assembly is particuarly suited to measure direct current voltages.
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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.
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3.发明申请公开(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
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.
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公开(公告)号：US20180067147A1
公开(公告)日：2018-03-08
申请号：US15695858
申请日：2017-09-05
Applicant: ABB Schweiz AG
Inventor： XUN GU , Klaus Bohnert , Sergio Vincenzo Marchese
CPC classification number: G01R15/241 , G01R15/246 , G01R19/0084 , G01R35/005
Abstract: In order to measure a voltage, an electro-optic element is placed in an electrical field generated by the voltage, and light is passed from a light source through a Faraday rotator and the electro-optic element onto a reflector and from there back through the electro-optic element and the Faraday rotator, thereby generating a voltage-dependent phase shift between two polarizations of the light. The interference contrast as well as a principal value of the total phase shift between said polarizations are measured and converted to a complex value having an absolute value equal to the contrast and a phase equal to the principal value. This complex value is offset and scaled using calibration values in order to calculate a compensated complex value. The voltage is derived from the compensated complex value.
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5.发明授权公开(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
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.
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Patent Agency Ranking
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
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.
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公开(公告)号：US10302411B2
公开(公告)日：2019-05-28
申请号：US15696095
申请日：2017-09-05
Applicant: ABB Schweiz AG
Inventor： Xun Gu , Sergio Vincenzo Marchese , Klaus Bohnert
Abstract: In order to measure the contrast of interference in an interference-based, closed-loop, phase-modulating optical sensor device, the gain of the feedback loop in a feedback controller is evaluated. This gain is found to be a measure for the contrast. The contrast evaluated in this way can e.g. be used for period-disambiguation when determining the measurand of the sensor device. The sensor device can e.g. be a high-voltage sensor or a current sensor.
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公开(公告)号：US20190154738A1
公开(公告)日：2019-05-23
申请号：US16253755
申请日：2019-01-22
Applicant: ABB Schweiz AG
Inventor： Klaus Bohnert , Andreas Frank , Yang Lin , Xun Gu , Georg Müeller
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.
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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
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.
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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).
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