Patents by Inventor Patrick Feneyrou
Patrick Feneyrou 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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Publication number: 20240004043Abstract: A method for processing a signal from a coherent lidar comprising a periodically frequency-modulated coherent source (L), the method includes the following steps: A decomposing each modulation period indexed j into a plurality of intervals indexed i, and determining, for each interval Iij, an elementary power spectral density DSP(i,j) of the beat signal over the interval, B determining an average power spectral density over j DSP(i), C determining a lower frequency bound of the average power density DSP(i) and an upper frequency bound, D determining a distance dk(i) and a velocity of the fluid vk(i) from the lower and upper bounds.Type: ApplicationFiled: December 10, 2021Publication date: January 4, 2024Inventors: Patrick FENEYROU, Jérôme BOURDERIONNET, Daniel DOLFI
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Patent number: 11243307Abstract: A method for processing a signal from a coherent lidar includes a coherent source, the method comprising steps consisting of: generating a first beat signal and a second beat signal, using respectively a first detection assembly and a second detection assembly for a plurality of n time intervals, determining n respective values of spectral density using a transform in the frequency domain of the cross-correlation between the first and second beat signals, determining a mean value of the spectral density using said n values of spectral density, determining a piece of location information on the target using the mean value of said spectral density.Type: GrantFiled: December 28, 2017Date of Patent: February 8, 2022Assignee: THALESInventors: Grégoire Pillet, Patrick Feneyrou
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Patent number: 11125879Abstract: A method for processing a signal arising from coherent lidar includes a coherent source that is periodically frequency-modulated; a beat signal being generated by photodetector on the basis of the interference between an optical signal that is referred to as the local oscillator having a local oscillator frequency (fOL(t)) and an optical signal that is backscattered by a target illuminated by the lidar, said beat signal being digitized; the local oscillator frequency (fOL(t)) being made up of the sum of a mean value (f0) and of a modulation frequency (fmod(t)) arising from the modulation of the source, the modulation frequency being periodic according to a modulation period (TFO), each period comprising n linear portions having n frequency slopes (?i), respectively, where n is greater than or equal to 2, the method comprising the steps consisting in: complexly modulating the beat signal; complexly demodulating the modulated signal (Smod) by n demodulation frequencies (fdemod(i)) each having a single slope thaType: GrantFiled: August 21, 2017Date of Patent: September 21, 2021Assignee: THALESInventors: Patrick Feneyrou, Grégoire Pillet
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Publication number: 20190331796Abstract: A method for processing a signal from a coherent lidar includes a coherent source, the method comprising steps consisting of: generating a first beat signal and a second beat signal, using respectively a first detection assembly and a second detection assembly for a plurality of n time intervals, determining n respective values of spectral density using a transform in the frequency domain of the cross-correlation between the first and second beat signals, determining a mean value of the spectral density using said n values of spectral density, determining a piece of location information on the target using the mean value of said spectral density.Type: ApplicationFiled: December 28, 2017Publication date: October 31, 2019Inventors: Grégoire PILLET, Patrick FENEYROU
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Publication number: 20190204441Abstract: A method for processing a signal arising from coherent lidar includes a coherent source that is periodically frequency-modulated; a beat signal being generated by photodetector on the basis of the interference between an optical signal that is referred to as the local oscillator having a local oscillator frequency (fOL(t)) and an optical signal that is backscattered by a target illuminated by the lidar, said beat signal being digitized; the local oscillator frequency (fOL(t)) being made up of the sum of a mean value (f0) and of a modulation frequency (fmod(t)) arising from the modulation of the source, the modulation frequency being periodic according to a modulation period (TFO), each period comprising n linear portions having n frequency slopes (?i), respectively, where n is greater than or equal to 2, the method comprising the steps consisting in: complexly modulating the beat signal; complexly demodulating the modulated signal (Smod) by n demodulation frequencies (fdemod(i)) each having a single slope thaType: ApplicationFiled: August 21, 2017Publication date: July 4, 2019Inventors: Patrick FENEYROU, Grégoire PILLET
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Patent number: 10317288Abstract: A method for reducing the peak factor of a signal transmitted in a frequency band comprising several channels, the signal using a plurality of channels in the band comprises: a step of clipping the signal, a step of subtracting the clipped signal from the signal, so as to obtain a peak signal, a step of filtering the peak signal with the aid of a multichannel filter configured to comply with a predetermined spectral mask for each of the channels used by the signal, and a step of subtracting the filtered peak signal from the signal. A device for emitting a multichannel signal implementing the method for reducing the peak factor is also provided.Type: GrantFiled: March 16, 2016Date of Patent: June 11, 2019Assignee: THALESInventors: Jean Minet, Grégoire Pillet, Patrick Feneyrou
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Publication number: 20180073932Abstract: A method for reducing the peak factor of a signal transmitted in a frequency band comprising several channels, the signal using a plurality of channels in the band comprises: a step of clipping the signal, a step of subtracting the clipped signal from the signal, so as to obtain a peak signal, a step of filtering the peak signal with the aid of a multichannel filter configured to comply with a predetermined spectral mask for each of the channels used by the signal, and a step of subtracting the filtered peak signal from the signal. A device for emitting a multichannel signal implementing the method for reducing the peak factor is also provided.Type: ApplicationFiled: March 16, 2016Publication date: March 15, 2018Inventors: Jean MINET, Grégoire PILLET, Patrick FENEYROU
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Patent number: 9588220Abstract: The general field of the invention is that of optical lidars comprising an optical porthole and operating at a first wavelength. The optical porthole of the lidar according to the invention comprises a layer or a sheet made of an optical material. The lidar comprises means for illuminating said layer or said sheet at a second wavelength different from the first wavelength, said material being transparent at the first wavelength and absorbent at the second wavelength, said second wavelength being located in the visible spectrum.Type: GrantFiled: May 26, 2015Date of Patent: March 7, 2017Assignee: ThalesInventors: Philippe Rondeau, Nicolas Bastien, Patrick Feneyrou, Jean-Pierre Schlotterbeck
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Patent number: 9441949Abstract: A method for generating M demodulation signals is disclosed. In one aspect, the method includes: providing M input signals, injecting each input signal into at least one first interferometer, and detecting M demodulation signals. The method also includes choosing M positive integers that are not all equal to zero and computing M demodulation signals. The ith demodulation signal being the product of Ri+1 functions, Ri being the chosen integer that corresponds to the first delay of the ith first interferometer, and the pth function being equal to St,p(t)=S(t=p?i), where p is an integer between 0 and Ri, ?i is the first delay introduced by the delay line of the ith first interferometer, and S is a transform of the signal at the output of the ith first interferometer.Type: GrantFiled: April 28, 2015Date of Patent: September 13, 2016Assignee: THALESInventors: Patrick Feneyrou, Grégoire Pillet, Jean Minet
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Publication number: 20150346328Abstract: The general field of the invention is that of optical lidars comprising an optical porthole and operating at a first wavelength. The optical porthole of the lidar according to the invention comprises a layer or a sheet made of an optical material. The lidar comprises means for illuminating said layer or said sheet at a second wavelength different from the first wavelength, said material being transparent at the first wavelength and absorbent at the second wavelength, said second wavelength being located in the visible spectrum.Type: ApplicationFiled: May 26, 2015Publication date: December 3, 2015Inventors: Philippe Rondeau, Nicolas Bastien, Patrick Feneyrou
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Publication number: 20150308811Abstract: A method for generating M demodulation signals is disclosed. In one aspect, the method includes: providing M input signals, injecting each input signal into at least one first interferometer, and detecting M demodulation signals. The method also includes choosing M positive integers that are not all equal to zero and computing M demodulation signals. The ith demodulation signal being the product of Ri+1 functions, Ri being the chosen integer that corresponds to the first delay of the ith first interferometer, and the pth function being equal to Si,p(t)=S(t?p?i), where p is an integer between 0 and Ri, ?i is the first delay introduced by the delay line of the ith first interferometer, and S is a transform of the signal at the output of the ith first interferometer.Type: ApplicationFiled: April 28, 2015Publication date: October 29, 2015Inventors: Patrick FENEYROU, Grégoire PILLET, Jean MINET
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Patent number: 8749794Abstract: The general field of the invention is that of optical devices designed for measuring anemometer parameters such as speed and temperature, the device being mounted on an aircraft and comprising an optical emission module illuminating the outside air, an optical reception module capable of receiving the light scattered by the air molecules, optical means forming a reference path and computing means connected to the reception module. The optical reception module comprises optical mixing means for mixing a portion of the beam originating from the reference path and a portion of the scattered light beam. The optical emission and reception means are arranged so that the reception device collects the light originating from the Brillouin-Mandel'shtam scattering.Type: GrantFiled: October 15, 2008Date of Patent: June 10, 2014Assignee: ThalesInventors: Patrick Feneyrou, Jean-Pierre Schlotterbeck, Gabrielle Lehureau
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Patent number: 8228584Abstract: The invention relates to a passive optical limiter having a nonlinear material capable of switching in a predetermined optical band from a transparent state to an opaque state as a function of the power of an incident laser beam. The nonlinear material is an organic dye which comprises molecules derived from 4,4-difluoro-4-bora-3a,4a-diaza-s-indacene into which a nitrogen atom is inserted at the meso position, referred to as aza-bodipy molecules, and which have conjugated ? chains functionalized so as to exhibit absorption for two photons around an incident beam wavelength lying between 1.45 ?m and 1.6 ?m.Type: GrantFiled: February 17, 2010Date of Patent: July 24, 2012Assignee: Ecole Normale Superieure de LyonInventors: Gerard Berginc, Patrick Feneyrou, Pierre-Antoine Bouit, Olivier Maury, Marie-Chantal Andraud
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Publication number: 20120140237Abstract: The general field of the invention is that of optical devices designed for measuring anemometer parameters such as speed and temperature, the device being mounted on an aircraft and comprising an optical emission module illuminating the outside air, an optical reception module capable of receiving the light scattered by the air molecules, optical means forming a reference path and computing means connected to the reception module. The optical reception module comprises optical mixing means for mixing a portion of the beam originating from the reference path and a portion of the scattered light beam. The optical emission and reception means are arranged so that the reception device collects the light originating from the Brillouin-Mandel'shtam scattering.Type: ApplicationFiled: October 15, 2008Publication date: June 7, 2012Applicant: THALESInventors: Jean-Claude Lehureau, Gabrielle Lehureau, Patrick Feneyrou, Jean-Pierre Schlotterbeck
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Publication number: 20110115211Abstract: The invention relates to a secure document including at least one inscription layer having identity information inscribed in or on the inscription layer. The inscribed identity information is coded according to a type of code such that the inscribed identity information includes a first series of first characters and/or first images made redundant with a second series of second characters and/or second images said to be non-forgeable, a second character and/or a second image not being able to be converted into another second character and/or a second image without erasing at least some of the identity inscriptions.Type: ApplicationFiled: July 15, 2009Publication date: May 19, 2011Applicant: THALESInventors: Patrick Feneyrou, Grégoire Pillet
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Publication number: 20100213356Abstract: The invention relates to a passive optical limiter having a nonlinear material capable of switching in a predetermined optical band from a transparent state to an opaque state as a function of the power of an incident laser beam. The nonlinear material is an organic dye which comprises molecules derived from 4,4-difluoro-4-bora-3a,4a-diaza-s-indacene into which a nitrogen atom is inserted at the meso position, referred to as aza-bodipy molecules, and which have conjugated ? chains functionalized so as to exhibit absorption for two photons around an incident beam wavelength lying between 1.45 ?m and 1.6 ?m.Type: ApplicationFiled: February 17, 2010Publication date: August 26, 2010Applicants: THALES, CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE, ECOLE NORMALE SUPERIEURE DE LYONInventors: Gerard Berginc, Patrick Feneyrou, Pierre-Antoine Bouit, Olivier Maury, Marie-Chantal Andraud
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Patent number: 7581441Abstract: The invention relates to a method of protecting aircraft in flight against clear air turbulence (CAT). Consider an aircraft occupying a position P and moving horizontally at a speed V, a plane PH0 being the horizontal plane passing through P. According to the invention, the method includes performing at least one pair of evaluations of air temperature TB, TC at two points B, C which have positions that are symmetrical relative to the plane PH0. At least one pair of horizontal air speed evaluations are performed VHB, VHC at the two points B, C; An air temperature gradient is determined; A horizontal air speed gradient is determined; An index signifying a presence of CAT is determined; The preceding steps are repeated; A trend is analyzed over time of the index.Type: GrantFiled: March 26, 2008Date of Patent: September 1, 2009Assignee: ThalesInventors: Hervé Barny, Jean-Claude Lehureau, Patrick Feneyrou
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Publication number: 20090013776Abstract: The invention relates to a method of protecting aircraft in flight against clear air turbulence (CAT). Consider an aircraft occupying a position P and moving horizontally at a speed V, a plane PH0 being the horizontal plane passing through P. According to the invention, the method includes performing at least one pair of evaluations of air temperature TB, TC at two points B, C which have positions that are symmetrical relative to the plane PH0. At least one pair of horizontal air speed evaluations are performed VHB, VHC at the two points B, C; An air temperature gradient is determined; A horizontal air speed gradient is determined; An index signifying a presence of CAT is determined; The preceding steps are repeated; A trend is analyzed over time of the index.Type: ApplicationFiled: March 26, 2008Publication date: January 15, 2009Applicant: THALESInventors: Herve Barny, Jean-Claude Lehureau, Patrick Feneyrou