Patents by Inventor Arnaud Devos
Arnaud Devos 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: 11948548Abstract: A phonon parametric oscillator is provided. The phonon parametric oscillator comprises a laser for periodically emitting brief optical pulses (IL), an assembly for generating acoustic pulses (IA) and a medium for coupling the acoustic pulses to an object (O), the assembly for generating acoustic pulses comprising an entrance face, an exit face, a conversion medium for converting the brief optical pulses into acoustic pulses and a propagation medium for propagating said acoustic pulses, the entrance and exit faces being reflective to the acoustic pulses, the propagation medium having a defined thickness, the exit face making contact with the coupling medium. In the phonon parametric oscillator according to the invention, the round-trip time of an acoustic pulse due to reflection from the entrance and exit faces, is equal to the emission period (?) of the laser, so that the reflected acoustic pulse is in phase with the following acoustic pulse.Type: GrantFiled: February 8, 2019Date of Patent: April 2, 2024Assignees: CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE, JUNIA, UNIVERSITE DE LILLE, CENTRALE LILLE INSTITUTInventor: Arnaud Devos
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Publication number: 20210035549Abstract: A phonon parametric oscillator is provided. The phonon parametric oscillator comprises a laser for periodically emitting brief optical pulses (IL), an assembly for generating acoustic pulses (IA) and a medium for coupling the acoustic pulses to an object (O), the assembly for generating acoustic pulses comprising an entrance face, an exit face, a conversion medium for converting the brief optical pulses into acoustic pulses and a propagation medium for propagating said acoustic pulses, the entrance and exit faces being reflective to the acoustic pulses, the propagation medium having a defined thickness, the exit face making contact with the coupling medium. In the phonon parametric oscillator according to the invention, the round-trip time of an acoustic pulse due to reflection from the entrance and exit faces, is equal to the emission period (?) of the laser, so that the reflected acoustic pulse is in phase with the following acoustic pulse.Type: ApplicationFiled: February 8, 2019Publication date: February 4, 2021Inventor: Arnaud DEVOS
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Patent number: 10393582Abstract: A method refocuses on an optical assembly target surface, using at least one beam originating from a short-pulse optical source, having at least one optical system for focusing the beam on the surface. Refocusing occurs after learning reference conditions for which the assembly is considered as focused. A focusing signal is detected representing a time overlap of pulses between a beam reflected and a reference beam not reflected by the surface, one of the beams delayed by a delay line. The optical path on which the delay line is placed is varied, on the basis of the reference conditions, to cause the focusing signal to reach or exceed a predetermined threshold. The focus is adjusted on the basis of the path variation between the reference conditions and the conditions for which the focusing signal reaches or exceeds the threshold.Type: GrantFiled: December 22, 2015Date of Patent: August 27, 2019Assignees: CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE, UNIVERSITE DE LILLE 1, ISENInventor: Arnaud Devos
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Patent number: 10247659Abstract: The present invention relates to a device (1) for characterizing an interface of a structure (6), said structure (6) comprising a solid first material and a second material, the materials being separated by said interface. The device (1) comprises: means (2) for generating a first mechanical wave; means (2) for forming Brillouin oscillations; means (10) for detecting time variation of the Brillouin oscillations; means (12) for responding to the time variation of the Brillouin oscillations to identify reflection of said first mechanical wave by said interface or transmission through said interface of a second mechanical wave interfering with the first mechanical wave; and means (13) for determining the variation in amplitude of the Brillouin oscillations before and after reflection or transmission by said interface. The invention also relates to a corresponding method of characterization.Type: GrantFiled: April 24, 2015Date of Patent: April 2, 2019Assignee: MENAPICInventors: Arnaud Devos, Patrick Emery, Arnaud Le Louarn
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Publication number: 20170350757Abstract: A method refocuses on an optical assembly target surface, using at least one beam originating from a short-pulse optical source, having at least one optical system for focusing the beam on the surface. Refocusing occurs after learning reference conditions for which the assembly is considered as focused. A focusing signal is detected representing a time overlap of the pulses between a beam reflected and a reference beam not reflected by the surface and comes from the source, one of the beams delayed by a delay line, the beam optical path on which the delay line is placed is varied, on the basis of the reference conditions, to cause the focusing signal to reach or go beyond a predetermined threshold. The focus is adjusted on the basis of variation knowledge in the path between the reference conditions and the conditions for which the focusing signal reaches or goes beyond the threshold.Type: ApplicationFiled: December 22, 2015Publication date: December 7, 2017Applicants: CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE, UNIVERSITÉ DE LILLE 1, ISENInventor: Arnaud DEVOS
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Publication number: 20170045440Abstract: The present invention relates to a device (1) for characterizing an interface of a structure (6), said structure (6) comprising a solid first material and a second material, the materials being separated by said interface. The device (1) comprises: means (2) for generating a first mechanical wave; means (2) for forming Brillouin oscillations; means (10) for detecting time variation of the Brillouin oscillations; means (12) for responding to the time variation of the Brillouin oscillations to identify reflection of said first mechanical wave by said interface or transmission through said interface of a second mechanical wave interfering with the first mechanical wave; and means (13) for determining the variation in amplitude of the Brillouin oscillations before and after reflection or transmission by said interface. The invention also relates to a corresponding method of characterization.Type: ApplicationFiled: April 24, 2015Publication date: February 16, 2017Inventors: Arnaud DEVOS, Patrick EMERY, Arnaud LE LOUARN
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Patent number: 7852488Abstract: The invention relates to a structure characterising device comprising means which are used for generating a first pump radiation and a second probe radiation and for transmitting different wavelength radiation, means for producing a time offset between said first pump and second probe radiation on the structure by means of detecting means of said second beam after the reflection or transmission thereof to said structure in such a way that an analysis signal is generated, means for processing said signal and identifying an area corresponding to the signal jump, for determining the jump amplitude according to different wavelengths, for comparing said amplitude with a theoretical amplitude variation pattern according to the wavelengths and for determining, for the wavelength characteristic for said theoretical pattern, a characteristic value associated to the structure thickness and to the radiation propagation velocity in said structure.Type: GrantFiled: June 19, 2006Date of Patent: December 14, 2010Assignee: Centre National de la Recherche Scientifique-CNRS-Inventors: Arnaud Devos, Grégory Caruyer
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Publication number: 20080315131Abstract: The invention relates to a structure characterising device comprising means which are used for generating a first pump radiation and a second probe radiation and for transmitting different wavelength radiation, means for producing a time offset between said first pump and second probe radiation on the structure by means of detecting means of said second beam after the reflection or transmission thereof to said structure in such a way that an analysis signal is generated, means for processing said signal and identifying an area corresponding to the signal jump, for determining the jump amplitude according to different wavelengths, for comparing said amplitude with a theoretical amplitude variation pattern according to the wavelengths and for determining, for the wavelength characteristic for said theoretical pattern, a characteristic value associated to the structure thickness and to the radiation propagation velocity in said structure.Type: ApplicationFiled: June 19, 2006Publication date: December 25, 2008Applicant: CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE-CNRSInventors: Arnaud Devos, Gregory Caruyer