Commissariat a L'energie Atomique Et Aux Energies Alternatives

Université Grenoble Alpes

Institut Polytechnique De Grenoble

Stmicroelectronics (Crolles 2) Sas

Centre National De La Recherche Scientifique

Stmicroelectronics S.a.

Université Joseph Fourier

Cnrs

Vermon S.a.

Universite Grenbole Alpes

Stmicroelectronics (Grenoble 2) Sas

Skandar Basrour

Fabrice Casset

Jean-Guillaume Coutard

Alain Gliere

Guillaume Laffont

Cédrick Chappaz

Emilie Trioux

Thomas Lauwers

Thomas Skotnicki

An Nguyen-Dinh

Stephane Monfray

Jean-Francois Carpentier

Patrick Pouteau

Pascal Ancey

Jean-Sébastien Danel

Jean Berthier

Paul Muralt

Thibault Ricart

Marie Gorisse

Guillaume Férin

Claire Bantignies

Bogdan Rosinski

Hung Le Khanh

Libor Rufer

Marjolaine Allain

Yoan Civet

Pascal Robert

Matthieu Museau

Henri Paris

Nicolas Béraud

Guilaume Ferin

The method is for the discriminant monitoring of a composite multi-material assembly () having at least one internal layer () made of a first, electrically conductive composite material and a second layer () made of a second, electrically insulating composite material, the second layer () covering the first internal layer (). The method includes: —preparing the composite multi-material assembly () by exposing a portion () of the internal layer (), which constitutes a first electrode; —applying a second electrode () to the surface of the second layer (), one of these electrodes () being earthed; —performing discriminant monitoring wherein a current is generated between the first electrode () and the second electrode () by applying a threshold voltage Us predetermined by calibration to characterize a lack of structural defects, the appearance of a breakdown at a voltage lower than the threshold voltage Us being indicative of the presence of at least one structural defect in the composite assembly ().

Method for determining a deformation of an area of a part obtained by additive manufacturing

The invention relates to a device and method for detecting an acoustic wave propagating toward a membrane, the membrane carrying a waveguide comprising an optical cavity defining a resonant frequency. Under the effect of a vibration of the membrane, the resonance frequency of the optical cavity varies. The device includes a light source for directing a light wave into the optical cavity, and a servo circuit for servo-controlling the wavelength of the light wave to the resonant wavelength of the optical cavity. Monitoring the variation in the wavelength of the light wave allows an amplitude of the acoustic wave to be estimated.

Optical device for detecting an acoustic wave

The invention is a device and method for detecting an analyte in a medium. An exciting light source produces an exciting light wave, which propagates to the medium and heats the latter. The device comprises a transducer for detecting the heating of the medium. According to one embodiment, the transducer is a thermal transducer, configured to detect a variation in the temperature of the medium. According to another embodiment, the transducer is an acoustic transducer, configured to detect a photoacoustic wave propagating from the medium. Whatever the embodiment, the transducer employs a membrane, on which a waveguide is placed. The waveguide comprises a resonant optical cavity. Transduction is achieved by analyzing a variation in a resonant wavelength of the optical cavity.

Photoacoustic or photothermal detector comprising an optical transducer

A piezoelectric bimorph cantilever beam system includes a shim having a first main surface, a second main surface opposite the first main surface, a proximal end connected to an anchor, and a distal end opposite the proximal end. The system further includes a first piezoelectric layer laminated on the first main surface of the shim and a second piezoelectric layer laminated on the second main surface of the shim. A first beam stiffener is provided over the first main surface of the shim adjacent to the anchor with the first beam stiffener at least partially covering the first piezoelectric layer. A second beam stiffener is provided over the second main surface of the shim adjacent to the anchor with the second beam stiffener at least partially covering the second piezoelectric layer.

Piezoelectric energy harvesting bending structure and the method of manufacturing thereof

A mechanical structure comprising a stack including an active substrate and at least one actuator designed to generate vibrations at the active substrate, the stack comprises an elementary structure for amplifying the vibrations: positioned between the actuator and the active substrate, the structure designed to transmit and amplify the vibrations; and comprising at least one trench, located between the actuator and the active substrate. A method for manufacturing the structure comprising the use of a temporary substrate is provided.

Mechanical structure comprising an actuator and mechanical amplification means, and production method

A vibrating device comprises: a first support configured to be deformed having a surface defined in a plane in directions X and Y; at least one actuator configured to generate plate modes propagated in the first support; the first support comprising: at least one defect with respect to the propagation of the plate modes; the defect being of geometrical nature or corresponding to a structural heterogeneity; comprising: a second support; at least one embedded mechanical reflector secured to the first support and in contact with the first support, configured to immobilize the first support in at least one direction Z at right angles to the directions X and Y, the mechanical reflector being secured to the second support and; the embedded mechanical reflector being configured to isolate a so-called active zone belonging to the surface defined in a plane in directions X and Y in which the plate modes are propagated, the active zone excluding the defect; the actuator being situated in the active region.

Vibrating device comprising embedded mechanical reflectors for defining an active plate mode propagation area and mobile apparatus comprising the device

A method of manufacturing bistable strips having different curvatures, each strip including a plurality of portion of layers of materials, wherein at least one specific layer portion is deposited by a plasma spraying method in conditions different for each of the strips.

Method of manufacturing bistable strips having different curvatures

A microfluidic valve including a microchannel, a membrane arranged so as to seal off the microchannel and equipped with resistive units, characterized in that at least one face of the membrane includes at least one groove, and in that the resistive units are arranged in the groove and are capable, when an electric control current flows through them, of expanding sufficiently under the effect of the heat produced by the flow of the electric current to cause the rupture of at least one part of the membrane.

Single use microfluidic valve

The present disclosure relates to a method of adjusting the resonance frequency of a vibrating element, comprising measuring the resonance frequency of the vibrating element, determining, using abacuses and as a function of the resonance frequency measured, a dimension and a position of at least one area of modified thickness to be formed on the vibrating element so that the resonance frequency thereof corresponds to a setpoint frequency, and forming on the vibrating element, an area of modified thickness of the determined dimension and position.

Method of adjusting the resonance frequency of a micro-machined vibrating element

Growing community of inventors

Grenoble, France

Skandar Basrour