Commissariat a L'energie Atomique

Commissariat &#xc0; L'&#xc9;nergie Atomique Et Aux &#xc9;nergies Alternatives

Laboratoire Central Des Ponts Et Chaussees

Ecole Nationale Des Ponts Et Chaussees

Elisabeth Delevoye

Jean-Charles Barbe

Jean-Charles Souriau

Matthieu Le Prado

Jean-Pierre Nikolovski

Christian Jeandey

Marc Beranger

Anne Ghis

David Henry

Francois Baleras

Sophie Morales

Francois Bertrand

François Bertrand

Berengere Lebental

François Baleras

Marie-Constance Corsi

Bérengère Lebental

The invention relates to a magnetic field measurement device, including a detector () configured to measure the amplitude of an output signal at a harmonic of an oscillation frequency of an excitation source, said amplitude being proportional to the magnetic field (B) to be measured, characterised in that it comprises an excitation circuit configured to associate with a principal excitation source (Bcos&#x3c9;t) oscillating at a principal oscillation frequency at least one secondary excitation source (Bcos(&#x3c9;/3t+&#x3a6;)) oscillating at a secondary oscillation frequency that is a fraction of the principal oscillation frequency, said fraction being odd if said harmonic is odd, and even if said harmonic is even.

Method and device for measuring a magnetic field by synchronised excitations

The invention concerns a device for analysing the microporosities of a given material including at least two phases, one of which is a fluid phase, including: multiple sensors () incorporated in the given material (M), where each of the sensors includes one or more cMUT acoustic and capacitive transducers.

Method and device for acoustic analysis of microporosities in a material such as concrete using multiple cMUTs transducers incorporated in the material

A method for installing a sorption element in a cavity including: disposing, within the cavity, a getter material, a reaction material, and a protective material, the protective material covering at least one part of the getter material so as to bury the at least one part; raising a temperature up to at least one removal temperature; and moving the protective material towards the reaction material by reaction between the protective material and the reaction material so that at least one portion of the part of the getter material is no longer covered with the protective material.

Thin film getter protection

A mechanical oscillator including: at least two deformable linking beams connected to a stationary substrate at a plurality of anchoring points which are distributed along the deformable linking beams, the deformable linking beams facing each other; and a plurality of vibrating cells each connected to and disposed between the at least two deformable linking beams, the plurality of vibrating cells being distributed along the deformable linking beams and a length between two of the plurality of anchoring points being greater or equal to a length of a number of cells greater or equal to 1, wherein each of the plurality of vibrating cells includes a deformable beam having a closed contour, the deformable beam being connected to the at least two deformable linking beams at a first pair of parts which are opposite to each other in the deformable beam.

Mechanical oscillator formed by a network of basic oscillators

Suspension and coupling beams of oscillating masses in a device which serves, for example, as a gyro and that includes oscillating masses form a single continuous network that allows the device to have a compact design. Preferably, a junction beam surrounds the two masses.

Oscillating mass resonator

A current measurement device includes a current sensor including a magnetic circuit, a plurality of windings including at least one excitation winding charged with the excitation of the magnetic circuit, and at least one detection winding. The sensor is equipped with windings forming a transformer of which at least one primary winding opposite the magnetic circuit through which a current I to be measured is designed to enter, and at least one secondary winding opposite the magnetic circuit capable of producing a counter reaction magnetic field.

Current sensor with alternating magnetic excitation

The invention relates to a fluxgate micromagnetometer implemented in thin layers, fitted with at least one excitation coil with an arrangement and a structure that bring improvements particularly in terms of the magnetometer footprint, reduction in the 'offsets' of measurements taken by the magnetometer, common mode rejection.

Micromagnetometer of the fluxgate type with improved excitation coil

The invention relates to a micro-machined, vibrating structure (), comprising a fixing end (), connected to a fixed support () and a hollow shell, preferably in a cylindrical form with a lateral wall (), forming a vibrating wall () of the vibrating structure (), in which progressive or stationary waves are generated. The hollow shell comprises a base (), forming the fixing end () for the vibrating structure () and a free end (). A naturally decoupled region is arranged between the fixing end () and the free end () of the hollow shell.

Growing community of inventors

Grenoble, France

Elisabeth Delevoye