Commissariat a L'energie Atomique Et Aux Energies Alternatives

Commissariat a L'energie Atomique

Michelin Recherche Et Technique S.a.

Framatome Gmbh

Technip France

Compagnie Generale Des Etablissments Michelin

Institut De Radioprotection Et De Surete Nucleaire

Compagnie Generale Des Etablissements Michelin

Technipfmc Subsea France

Jean-Marc Decitre

Olivier Casula

Yann Nicolas

Gérard Cattiaux

Thierry Sollier

Yann Kernin

Marc Piriou

Frédéric Nozais

Denis Premel

Thierry Dardelin

Laura Pucci

Patrice Alcalde

Laure Pucci

Benjamin Delabre

A tube inspection unit () includes an eddy current probe (). The probe () has a plurality of inductors and a plurality of receivers. The receivers are magnetoresistances having a substantially linear functional zone. The inductors of the probe () are linked to a controller (). The controller () is programmed to inject, into the inductors, a voltage with a sinusoidal component and a nonzero direct-current component, such that the receivers have a polarization center situated inside the substantially linear functional zone.

Tube inspection unit with eddy current probe and corresponding method

A method for nondestructive inspection of a flexible underwater pipe capable detecting a flooding of the annular space in which the armor layers are found. The method comprises the steps of arranging in the vicinity of the external sheath at least one pair of electrodes, measuring the impedance at the terminals of the pair of electrodes, at a frequency advantageously between 10 Hz and 10 MHz, and comparing the measured impedance with reference values so as to determine the nature of the fluid contained in the annular space.

Device and method for nondestructive inspection of a flexible underwater pipe

An inspection head of an eddy current non-destructive testing sensor with separate transmitting and receiving functions includes a support whereon is arranged at least one transmitting/receiving element. Each element includes a circuit transmitting a local electromagnetic field, by circulating a predefined alternating current in the circuit, and an electromagnetic receiver sensitive to the locally transmitted electromagnetic field. The transmitting circuit is a portion of conductive sheet extending over a layer of the support layer in a predefined main direction of flow of the alternating current. The electromagnetic receiver is disposed facing the transmitting circuit relative to an axis normal to the layer of the support on which the portion of sheet extends to have an electromagnetic detection axis orthogonal to this normal axis and orthogonal to the predefined main direction of flow of the alternating current in the portion of conductive sheet.

Inspection head of an eddy current non-destructive testing sensor and sensor comprising such an inspection head

A method for manufacturing a testing head of a non-destructive testing sensor based on eddy currents includes: optimizing a geometric design of coils of the testing head based on a criterion for minimizing an electromotive force induced in at least one coil having a receiving function and/or maximizing a variation, due to presence of a standard defect to be detected in a part to be inspected, of the induced electromotive force; optimizing the geometric design of the coils further based on at least one criterion for optimizing a further variation, due to a variation in distance between the testing head and the part to be inspected, of the induced electromotive force; optimizing geometric dimensions of each of the coils; and manufacturing the testing head in accordance with the geometric design of the coils carrying out the optimization.

Method for manufacturing a testing head of a non-destructive testing sensor based on eddy currents

A device for non-destructive testing of an electrically conductive part including: an induction portion, a receiving portion, and a processor. The induction portion includes an inductor dissociated into n layers supplied at different frequencies f, f, . . . , fn, wherein the receiving portion includes plural magnetic receivers supplied at different frequencies f', f&#x2032;, . . . , fn&#x2032; connected to one another in at least one column, each magnetic receiver being positioned under a layer, the indices n and m being integers &#x3e;2, and wherein the processor makes it possible to know the magnetic field in each of the magnetic receivers of a column.

Device for the non-destructive testing of an electrically conductive structure

A device for detection of at least one defect in a concave or convex structure including an emitting part and a receiving part, in which the emitting part includes at least one current layer that makes it possible to create currents oriented approximately along a same direction as the defects whose influence is to be minimized and the receiving part includes at least one magnetic field receiver, added on or etched on a flexible support.

Device for detection of at least one defect in a concave or convex structure

The device () for checking a tire () reinforcing thread comprises: an induction member () that induces a magnetic flux (P, P; P) in the thread (-), a support () supporting the induction member () having the overall shape of a U and comprising legs () that conduct the magnetic flux (P) into the thread (-), the legs defining a direction of alignment of the device, at least one receiver member () that receives the magnetic flux (P, P; P) flowing through the thread (-) situated between the legs (). The dimensions of the receiver member are designed so as to measure only the magnetic flux flowing through the thread (-) when, in operation, the direction of alignment () is parallel to the thread (-).

Device for monitoring metal wires in a tire

The invention concerns a method for producing an assembly of at least one transmission coil (B) and one reception coil (B) for eddy current testing, the reception coil receiving in the absence of fault a complex amplitude signal V, subject to a variation &#x3b4;Vin the presence of a characteristic fault to be detected. The method consists in selecting the distance &#x394;between the axes of the transmission coil and the reception coil so as to maximize the ratio I&#x3b4;V/VI.

Method for assembling a high-dynamic and high-spatial resolution eddy current testing head

A device with separate emission/reception functions for making eddy current tests on an electrically conducting part comprising several emission rows (-) composed of emission windings (), and several reception columns (a-h) each composed of reception windings () connected in series in at least one series, in which the emission windings associated with the reception windings in one series are powered by currents at different frequencies.

Device with separate emission/reception functions for making eddy current tests on an electrically conducting part

A method for making eddy current tests on an electrically conducting part (), in which a sensor moves above this part, uses separate emission/reception functions. The method includes obtaining a first complex voltage curve at the terminals of a reception winding (), obtaining at least one second complex voltage curve at the terminals of a reception winding, determining at least one given distance that minimizes the modulus of the difference between the first curve and the at least one second curve, calculating the arithmetic mean (d) of the at least one given distance, choosing this arithmetic mean+/&#x2212;20% as the distance between the two emission and reception windings, and detecting if one or several defects are present in this part.

Growing community of inventors

Marcoussis, France

Jean-Marc Decitre