Patents by Inventor Klaus Bohnert
Klaus Bohnert has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 8233754Abstract: An electro-optical high-voltage sensor includes a waveguiding sensing fiber of an electro-optical material. The electrical field of the voltage to be measured is substantially parallel to the longitudinal axis of the sensing fiber. The sensing fiber carries two orthogonally polarized light waves, with the applied field affecting the birefringence between the waves. Using an electro-optical waveguiding fiber in this configuration allows the voltage between two widely spaced points to be accurately measured.Type: GrantFiled: June 22, 2009Date of Patent: July 31, 2012Assignee: ABB Research Ltd.Inventors: Klaus Bohnert, Andreas Frank, Hubert Brändle
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Publication number: 20110147346Abstract: An exemplary gas-insulated switchgear device is disclosed which includes a current sensor and a voltage sensor located at a partition insulator. The current sensor can include a magneto-optical fiber on a flexible carrier strip and can be manufactured separately for being easily mounted to an assembled switchgear device. The current sensor can include an electro-optical fiber extending radially into the partition insulator and whose ends are embedded in recesses in the bus bar as well as in the metal embracing of the partition insulator for accurately integrating the voltage.Type: ApplicationFiled: June 21, 2010Publication date: June 23, 2011Applicant: ABB RESEARCH LTDInventors: Klaus BOHNERT, Hubert Braendle
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Patent number: 7963170Abstract: A pressure sensor is disclosed wherein pressure induced changes in birefringent properties of an optical sensing element are read out by transmission of at least one light beam. The pressure sensor can include at least one single-material transparent body which is subjected to at least two different pressures (p1, p2) in at least two different regions via at least two pressure chambers. The transparent body can transmit by a parallel or minimally divergent light beam without total reflection in the body such that the pressure-induced birefringence and a corresponding differential phase shift between linear polarisation components of the light beam depends on a difference of the different pressures (p1, p2).Type: GrantFiled: January 8, 2010Date of Patent: June 21, 2011Assignee: ABB Research LtdInventors: Axel Kramer, Frank Kassubek, Klaus Bohnert, Hubert Braendle
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Publication number: 20110128655Abstract: The current in a generator circuit breaker is measured using the Faraday effect of an optical sensing fiber looped around the breaker's conductor. The sensing fiber is arranged in a sensing strip, which can be mounted to the enclosure of the generator circuit breaker or to the conductor. Exemplary embodiments can have a wide measuring range and can easily be fitted to new or existing generator circuit breakers.Type: ApplicationFiled: January 28, 2011Publication date: June 2, 2011Applicant: ABB RESEARCH LTDInventors: Moritz HOCHLEHNERT, Thomas Lorek, Ahmed Zekhnini, Andreas Frank, Klaus Bohnert
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Publication number: 20110122654Abstract: DC current in a high voltage AC/DC or DC/AC converter station can be measured via the Faraday effect in one or more loops of an optical sensing fiber located at the base of a bushing extending through a wall of the hall. This arrangement can exploit the base of the bushing being at ground potential, which can simplify mounting work and maintenance.Type: ApplicationFiled: January 27, 2011Publication date: May 26, 2011Applicant: ABB RESEARCH LTD.Inventors: Juergen HAEFNER, Andreas Frank, Klaus Bohnert
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Publication number: 20110072858Abstract: A method is provided for tuning the fiber optic retarder of a fiber optic current sensor towards a desired temperature dependence, the sensing fiber is exposed to a magnetic field or corresponding electric current and the sensor signal as well as the signal's dependence on the retarder temperature are measured. From this initial sensor signal and its temperature dependence, a target sensor signal can be determined, at which the dependence on the retarder temperature equals a desired value. Then, the retarder is thermally treated until the sensor signal reaches the target value. The method obviates the need for repetitively measuring the temperature dependence during the tuning process.Type: ApplicationFiled: September 27, 2010Publication date: March 31, 2011Applicant: ABB Research LtdInventors: Robert WUEEST, Andreas FRANK, Klaus BOHNERT, Philippe GABUS
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Patent number: 7911196Abstract: A voltage sensor includes two optical sensing fibers and a control unit. The sensing fibers carry a first mode of light and a second mode of light, which are orthogonally polarized, with a birefringence between the two modes depending on the electric voltage to be measured. The control unit is configured to generate light for the two modes in the sensing element and to measure the phase delay suffered between the two modes. A 45° Faraday rotator is arranged between the control unit and the sensing fibers. The Faraday rotator allows the behavior and functionality of the sensing fibers and their associated components to be converted to those of a magneto-optical current sensors with polarization-rotated reflection, which in turn allows use of advanced measuring techniques developed for optical gyroscopes and current sensors.Type: GrantFiled: June 22, 2009Date of Patent: March 22, 2011Assignee: ABB Research LtdInventor: Klaus Bohnert
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Publication number: 20110050207Abstract: Two transversely poled fibers are disclosed which can be wound around a holder with their poling directions being anti-parallel. A coupling exchanges the polarization directions of the modes of the fibers. Thermally and mechanically caused birefringence changes can thereby be substantially cancelled, while electrical field induced birefringence changes can be added, to provide a more robust high voltage measuring device.Type: ApplicationFiled: November 5, 2010Publication date: March 3, 2011Applicant: ABB RESEARCH LTDInventors: Klaus BOHNERT, Stephan Wildermuth, Hubert Braendle
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Patent number: 7891682Abstract: A motor vehicle has a rear axle cross member, from which two diagonal struts project forward in a V-shape, which diagonal struts are connected with their front end in each case to a vehicle longitudinal member. Here, it is important that an annular, closed stiffening structure is provided behind the rear axle cross member as viewed in the direction of travel. The stiffening structure is supported with its front end on the rear axle cross member and with its rear end, via struts which project rearward in a V-shape, on rear vehicle longitudinal members.Type: GrantFiled: November 4, 2008Date of Patent: February 22, 2011Assignee: Dr. Ing. h.c. F. Porsche AGInventors: Ali Oezkan, Oliver Moessinger, Thomas Hunn, Kay Lorenz, Klaus Bohnert, Marco Ujhasi
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Patent number: 7876448Abstract: To measure a sum of electrical currents in different conductors, light is led in an optical sensing fiber around all the conductors. The sensing fiber can be wound around the conductors in a single loop or in several individual loops. Interspersed polarization maintaining fibers and retarders can be used to transfer the light between individual loops for preventing undesired signals from stray magnetic fields. The method has high accuracy is particularly suited for measuring large currents that sum up to zero.Type: GrantFiled: October 3, 2008Date of Patent: January 25, 2011Assignee: ABB Research Ltd.Inventors: Lars Andersson, Hubert Braendle, Klaus Bohnert
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Patent number: 7871107Abstract: A rollover protection device is disposed behind the vehicle seats of a motor vehicle, in particular a convertible with a convertible top, and has at least one rollover protection cassette containing a rollbar. It is important here that the at least one rollover protection cassette or a housing of the same is a supporting component of a stiffening support which is of multi-part construction and extends in the transverse direction of the vehicle.Type: GrantFiled: September 29, 2008Date of Patent: January 18, 2011Assignee: Dr. Ing. h.c.F. Porsche AGInventors: Josip Vlahovic, Ali Oezkan, Klaus Bohnert
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Publication number: 20100180686Abstract: A pressure sensor is disclosed wherein pressure induced changes in birefringent properties of an optical sensing element are read out by transmission of at least one light beam. The pressure sensor can include at least one single-material transparent body which is subjected to at least two different pressures (p1, p2) in at least two different regions via at least two pressure chambers. The transparent body can transmit by a parallel or minimally divergent light beam without total reflection in the body such that the pressure-induced birefringence and a corresponding differential phase shift between linear polarisation components of the light beam depends on a difference of the different pressures (p1, p2).Type: ApplicationFiled: January 8, 2010Publication date: July 22, 2010Applicant: ABB RESEARCH LTDInventors: Axel Kramer, Frank Kassubek, Klaus Bohnert, Hubert Braendle
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Publication number: 20100108870Abstract: A pressure sensor is disclosed with at least one pressure sensing element, the pressure induced changes in the optical properties of which are evaluated by illumination with at least one light source. The pressure sensor can include at least two semiconductor-based pressure sensing elements located in individual pressure chambers, which sensing elements are located essentially adjacent to each other. The sensing elements can be irradiated with the same light source, wherein the light transmitted through the sensing elements is detected using at least two corresponding detectors, and wherein the differential pressure in the two pressure chambers is evaluated based on the output of these detectors.Type: ApplicationFiled: January 11, 2010Publication date: May 6, 2010Applicant: ABB RESEARCH LTDInventors: Axel KRAMER, Frank Kassubek, Klaus Bohnert, Hubert Braendle
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Patent number: 7692420Abstract: The current in a conductor is measured by exploiting the Faraday effect in a sensing fiber. The light returning from the sensing fiber is split into at least two parts, at least one of which is analyzed by a first circular analyzer for generating a first signal. A second part may e.g. be analyzed by a second circular analyzer, and a third part may be analyzed by a linear analyzer. By combining the signals obtained in this way, the current induced phase delay in the returning light can be measured efficiently and accurately.Type: GrantFiled: October 22, 2008Date of Patent: April 6, 2010Assignee: ABB Research Ltd.Inventors: Klaus Bohnert, Andreas Frank, Hubert Brandle
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Publication number: 20090289617Abstract: A voltage sensor includes two optical sensing fibers and a control unit. The sensing fibers carry a first mode of light and a second mode of light, which are orthogonally polarized, with a birefringence between the two modes depending on the electric voltage to be measured. The control unit is configured to generate light for the two modes in the sensing element and to measure the phase delay suffered between the two modes. A 45° Faraday rotator is arranged between the control unit and the sensing fibers. The Faraday rotator allows the behavior and functionality of the sensing fibers and their associated components to be converted to those of a magneto-optical current sensors with polarization-rotated reflection, which in turn allows use of advanced measuring techniques developed for optical gyroscopes and current sensors.Type: ApplicationFiled: June 22, 2009Publication date: November 26, 2009Applicant: ABB Research Ltd.Inventor: Klaus BOHNERT
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Publication number: 20090290165Abstract: An electro-optical high-voltage sensor includes a waveguiding sensing fiber of an electro-optical material. The electrical field of the voltage to be measured is substantially parallel to the longitudinal axis of the sensing fiber. The sensing fiber carries two orthogonally polarized light waves, with the applied field affecting the birefringence between the waves. Using an electro-optical waveguiding fiber in this configuration allows the voltage between two widely spaced points to be accurately measured.Type: ApplicationFiled: June 22, 2009Publication date: November 26, 2009Applicant: ABB Research Ltd.Inventors: Klaus Bohnert, Andreas Frank, Hubert Brandle
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Publication number: 20090134669Abstract: A motor vehicle has a rear axle cross member, from which two diagonal struts project forward in a V-shape, which diagonal struts are connected with their front end in each case to a vehicle longitudinal member. Here, it is important that an annular, closed stiffening structure is provided behind the rear axle cross member as viewed in the direction of travel. The stiffening structure is supported with its front end on the rear axle cross member and with its rear end, via struts which project rearward in a V-shape, on rear vehicle longitudinal members.Type: ApplicationFiled: November 4, 2008Publication date: May 28, 2009Applicant: DR. ING. H.C. F. PORSCHE AKTIENGESELLSCHAFTInventors: Ali Oezkan, Oliver Moessinger, Thomas Hunn, Kay Lorenz, Klaus Bohnert, Marco Ujhasi
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Publication number: 20090134668Abstract: A motor vehicle bodywork has a floor assembly with an upwardly convex and downwardly open longitudinal center tunnel and two side sills parallel thereto. Floor elements are disposed between the longitudinal center tunnel and the side sills. A driver side and a passenger side are each provided with at least one front and one rear seat crossmember, seen in the direction of travel. The seat cross-members extend in the transverse direction of the vehicle and rest on the associated floor elements. It is important that the driver side and/or passenger side seat cross-members are each connected to each other in their upper regions via a plate-like thrust element.Type: ApplicationFiled: November 24, 2008Publication date: May 28, 2009Applicant: DR. ING. H.C. F. PORSCHE AKTIENGESELLSCHAFTInventors: Ali Oezkan, Klaus Bohnert, Gernot Jenisch
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Publication number: 20090097796Abstract: To measure a sum of electrical currents in different conductors, light is led in an optical sensing fiber around all the conductors. The sensing fiber can be wound around the conductors in a single loop or in several individual loops. Interspersed polarization maintaining fibers and retarders can be used to transfer the light between individual loops for preventing undesired signals from stray magnetic fields. The method has high accuracy is particularly suited for measuring large currents that sum up to zero.Type: ApplicationFiled: October 3, 2008Publication date: April 16, 2009Inventors: Lars Andersson, Hubert Braendle, Klaus Bohnert
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Publication number: 20090085337Abstract: A rollover protection device is disposed behind the vehicle seats of a motor vehicle, in particular a convertible with a convertible top, and has at least one rollover protection cassette containing a rollbar. It is important here that the at least one rollover protection cassette or a housing of the same is a supporting component of a stiffening support which is of multi-part construction and extends in the transverse direction of the vehicle.Type: ApplicationFiled: September 29, 2008Publication date: April 2, 2009Applicant: DR. ING. H.C. F. PORSCHE AGInventors: Josip Vlahovic, Ali Oezkan, Klaus Bohnert