Patents Assigned to Oxsensis Limited
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Patent number: 10545035Abstract: An optical sensor having one or more sensing interference elements is disclosed. A first detector function generates a coarse optical path difference signal for example using a discrete Fourier transform of a detected interference spectrum, and a second detector function generates a refined optical path difference signal using the coarse optical path difference signal and for example a cross correlation of the interference spectrum with one or more sets of periodic transfer functions.Type: GrantFiled: August 21, 2017Date of Patent: January 28, 2020Assignee: Oxsensis LimitedInventor: Ralf-Dieter Pechstedt
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Patent number: 9995604Abstract: An optical sensor (10) comprises an optical cavity defined by a dielectric body and responsive to one or more physical environmental conditions, and a waveguide (70) having a terminal end spaced apart from the optical cavity such that light is optically coupled from the terminal end of the waveguide (70) to the optical cavity. The waveguide (70) is arranged such that, in use, it is maintained at a first temperature that would not damage the optical coupling to the optical cavity when the dielectric body is maintained at a second temperature sufficient to damage the optical coupling to the optical cavity.Type: GrantFiled: July 5, 2016Date of Patent: June 12, 2018Assignee: OXSENSIS LIMITEDInventors: Arnold Peter Roscoe Harpin, John Paul Drake, Stephen Geoffrey Tyler
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Patent number: 9989385Abstract: A method of assembling an optical sensor for measuring pressure and/or temperature is disclosed. The optical sensor is adapted for use in high temperature environments, such as gas turbines and other engines. The method comprises fabricating a sensor element formed of a pill having an enclosed cavity, bonding the pill to a front end of a spacer, bonding a lens to the back end of the spacer to form the optical assembly, aligning an optical fiber to the optical assembly, and fixing the fiber in position by fusing the fiber to the lens.Type: GrantFiled: August 22, 2016Date of Patent: June 5, 2018Assignee: Oxsensis LimitedInventors: Arnold Peter Roscoe Harpin, Stephen James Fasham, Stephen Geoffrey Tyler
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Publication number: 20180045541Abstract: An optical sensor having one or more sensing interference elements is disclosed. A first detector function generates a coarse optical path difference signal for example using a discrete Fourier transform of a detected interference spectrum, and a second detector function generates a refined optical path difference signal using the coarse optical path difference signal and for example a cross correlation of the interference spectrum with one or more sets of periodic transfer functions.Type: ApplicationFiled: August 21, 2017Publication date: February 15, 2018Applicant: Oxsensis LimitedInventor: Ralf-Dieter Pechstedt
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Patent number: 9778125Abstract: An optical pressure sensor is disclosed having a pressure sensing optical cavity. A temperature sensing optical cavity at the sensing head is used by an interrogator to correct a pressure signal for effects of temperature. The optical cavities may be, for example, Fabry Perot cavities in the sensor head.Type: GrantFiled: January 12, 2017Date of Patent: October 3, 2017Assignee: Oxsensis LimitedInventors: Ralf-Dieter Pechstedt, Fabrice F. M. Maillaud
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Patent number: 9766099Abstract: An optical sensor having one or more sensing interference elements is disclosed. A first detector function generates a coarse optical path difference signal for example using a discrete Fourier transform of a detected interference spectrum, and a second detector function generates a refined optical path difference signal using the coarse optical path difference signal and for example a cross correlation of the interference spectrum with one or more sets of periodic transfer functions.Type: GrantFiled: March 13, 2013Date of Patent: September 19, 2017Assignee: Oxsensis LimitedInventor: Ralf-Dieter Pechstedt
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Patent number: 9766178Abstract: An optical sensor is described for distinguishing between liquids of different refractive index, through strength of interference caused by an optical cavity having an exposed optical boundary in contact with such liquids. The sensor may be used, for example, to distinguish between water and aviation fuel in an aircraft fuel tank.Type: GrantFiled: May 28, 2013Date of Patent: September 19, 2017Assignee: Oxsensis LimitedInventor: Ralf-Dieter Pechstedt
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Publication number: 20170131122Abstract: An optical sensor (10) comprises an optical cavity defined by a dielectric body and responsive to one or more physical environmental conditions, and a waveguide (70) having a terminal end spaced apart from the optical cavity such that light is optically coupled from the terminal end of the waveguide (70) to the optical cavity. The waveguide (70) is arranged such that, in use, it is maintained at a first temperature that would not damage the optical coupling to the optical cavity when the dielectric body is maintained at a second temperature sufficient to damage the optical coupling to the optical cavity.Type: ApplicationFiled: July 5, 2016Publication date: May 11, 2017Applicant: OXSENSIS LIMITEDInventors: Arnold Peter Roscoe HARPIN, John Paul DRAKE, Stephen Geoffrey TYLER
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Publication number: 20170122828Abstract: An optical pressure sensor is disclosed having a pressure sensing optical cavity. A temperature sensing optical cavity at the sensing head is used by an interrogator to correct a pressure signal for effects of temperature. The optical cavities may be, for example, Fabry Perot cavities in the sensor head.Type: ApplicationFiled: January 12, 2017Publication date: May 4, 2017Applicant: Oxsensis LimitedInventors: Ralf-Dieter Pechstedt, Fabrice F. M. Maillaud
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Patent number: 9581514Abstract: An optical pressure sensor is disclosed having a pressure sensing optical cavity. A temperature sensing optical cavity at the sensor head is used by an interrogator to correct a pressure signal for effects of temperature. The optical cavities may be, for example, Fabry Perot cavities in the sensor head.Type: GrantFiled: March 13, 2013Date of Patent: February 28, 2017Assignee: Oxsensis LimitedInventors: Ralf-Dieter Pechstedt, Fabrice F. M. Maillaud
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Publication number: 20170045384Abstract: A method of assembling an optical sensor for measuring pressure and/or temperature is disclosed. The optical sensor is adapted for use in high temperature environments, such as gas turbines and other engines. The method comprises fabricating a sensor element formed of a pill having an enclosed cavity, bonding the pill to a front end of a spacer, bonding a lens to the back end of the spacer to form the optical assembly, aligning an optical fibre to the optical assembly, and fixing the fibre in position by fusing the fibre to the lens.Type: ApplicationFiled: August 22, 2016Publication date: February 16, 2017Applicant: Oxsensis LimitedInventors: Arnold Peter Roscoe Harpin, Stephen James Fasham, Stephen Geoffrey Tyler