Patents by Inventor David Gachet

David Gachet 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).

  • Publication number: 20250053138
    Abstract: Method for testing a balance spring or a balance spring blank arranged to form a balance spring, the balance spring being required to have at least one predetermined expected resonance frequency, the testing method including the following steps: a. applying to the balance spring or balance spring blank, a vibratory excitation that varies over time in order to cover a predetermined frequency range, b. identifying at least one characteristic of a resonance frequency of the balance spring or balance spring blank, such as a resonance peak, during, or in response to, the vibratory excitation over the predetermined frequency range, c. subjecting the resonance frequency characteristic identified in step b. to a prediction machine in order to determine if the balance spring or balance spring blank is affected by a defect.
    Type: Application
    Filed: November 30, 2022
    Publication date: February 13, 2025
    Inventors: David GACHET, Kevin SOOBBARAYEN, Susana TOBENAS
  • Publication number: 20240069496
    Abstract: A method for inspecting a spiral or a spiral blank arranged to form a spiral, the spiral having to exhibit at least one predetermined resonant frequency, the inspecting method including the following steps: a. applying to the spiral or to the spiral blank a time-varying vibrational excitation to cover a predetermined frequency range, b. identifying at least one characteristic of a resonant frequency, such as a resonance peak, of the spiral or of the spiral blank during the vibrational excitation over the predetermined frequency range, c. submitting to a predicting machine the resonant frequency characteristic identified in the step b. to determine a stiffness of the spiral or of the spiral blank and/or determine whether or not a dimensional correction of the spiral or of the spiral blank is necessary to obtain the predetermined resonant frequency.
    Type: Application
    Filed: January 14, 2022
    Publication date: February 29, 2024
    Inventors: David GACHET, Kevin SOOBBARAYEN, Susana TOBENAS
  • Patent number: 9097674
    Abstract: A method and a device for detecting a resonant non-linear optical signal induced in a sample including a resonant medium and a non-resonant medium forming an interface is disclosed. The device includes an excitation light beam that intercepts the sample along an optical axis. The device further includes a first optical detection module for detecting a nonlinear optical signal resulting from the interaction of the beam with the sample, and a mirror that reflects the excitation beam. The device further includes a second optical detection module for detecting a nonlinear optical signal resulting from the interaction of the reflected excitation beam with the sample, and a processing module for processing the optical signals, detected by the first and second detection modules. Processing the optical signals includes calculating a difference in the detected signals, the difference being characteristic of a vibrational or electronic resonance of the resonant medium.
    Type: Grant
    Filed: January 18, 2011
    Date of Patent: August 4, 2015
    Assignee: Centre National de la Recherche Scientifique—CNRS
    Inventors: Hervé Rigneault, David Gachet, Sophie Brustlein, Franck Billard
  • Patent number: 8804117
    Abstract: A method and device for detecting a resonant non-linear optical signal induced in a sample, the sample including a resonant medium and a non-resonant medium forming an interface. The device includes an emission source of at least one first excitation light beam, called a pump beam, at a given angular frequency ?p for the excitation of the resonant medium of said sample, an optical detection module for detecting a non-linear optical signal resulting from the interaction of said pump beam with an axial interface between the resonant and non-resonant media of the sample, in at least two symmetrical directions ({right arrow over (k)}, {right arrow over (k)}?) relative to the optical axis of said excitation beam incident in the sample, and a processing unit for processing signals (IFwd({right arrow over (k)}), IFwd({right arrow over (k)}?)) thus detected, allowing the difference between said signals to be obtained.
    Type: Grant
    Filed: January 18, 2011
    Date of Patent: August 12, 2014
    Assignee: Centre National de la Recherche Scientifique-CNRS
    Inventors: Hervé Rigneault, David Gachet, Sophie Brustlein
  • Publication number: 20130038871
    Abstract: The invention relates to a method and a device for detecting a resonant non-linear optical signal induced in a sample (805) comprising a resonant medium (61) and a non-resonant medium forming an interface, the device comprising: an emission source (801) of at least one first excitation light beam of a resonant medium, called a pump beam, at a first given angular frequency ?p, said pump beam being incident on a sample along an optical axis, and intercepting the sample at a given position of a transverse interface between the resonant and non-resonant medium, a first optical detection module (803) for detection of the nonlinear optical signal resulting from the interaction of said beam or beams with the sample, means of reflection (813) of said excitation beam or beams, the excitation beam or beams thus reflected intercepting said transverse interface substantially at the same position as the incident excitation beam or beams, a second optical detection module (806) for detection of the nonlinear optical sig
    Type: Application
    Filed: January 18, 2011
    Publication date: February 14, 2013
    Applicant: CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE- CNRS
    Inventors: Hervé Rigneault, David Gachet, Sophie Brustlein, Franck Billard
  • Publication number: 20130021606
    Abstract: The invention relates to a method and a device (100) for detecting a resonant non-linear optical signal induced in a sample (105), the sample comprising a resonant medium (41) and a non-resonant medium (42) forming an interface (43), the device comprising: an emission source (101) of at least one first excitation light beam, called a pump beam, at a first given angular frequency ?p for the excitation of the resonant medium of said sample, an optical detection module (106) for detecting a non-linear optical signal resulting from the interaction of said pump beam with an axial interface between the resonant and the non-resonant media of the sample, in at least two symmetrical directions (, ?) relative to the optical axis of said excitation beam incident in the sample, and a processing unit (125) for processing signals (IFwd(), IFwd(?)) thus detected, allowing the difference between said signals to be obtained, the resulting difference signal being characteristic of a vibrational or electronic resonance of th
    Type: Application
    Filed: January 18, 2011
    Publication date: January 24, 2013
    Applicant: CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE- CNRS
    Inventors: Hervé Rigneault, David Gachet, Sophie Brustlein