Abstract: The invention relates to a device and method for estimating defects potentially present in an object comprising an outer surface, wherein the method comprises the steps of: a) illuminating the outer surface of the object with an inductive wave field at a predetermined frequency; b) measuring an induced wave field ({right arrow over (H)}) at the outer surface of the object; c) developing from the properties of the object's material a coupling matrix T associated with a depth Z of the object from the outer surface; d) solving the matrix system ( [ H ? 0 ? 0 ? ] = T · J ? ) to determine a vector ({right arrow over (J)}) at depth Z; e) extracting a sub-vector ({right arrow over (J)}S) from the vector ({right arrow over (J)}) corresponding to a potential defect on the object at depth Z; and f) quantitatively estimating the potential defect from the sub-vector ({right arrow over (J)}S) at depth Z, wherein the method is performed using a computer or processor.

Abstract: The invention relates to a method for modelling the interactions of a wave, generated by a source emitting an impulsive signal of arbitrary shape, with a medium, including steps involving: a) elaboration of a generic model by the method called “DPSM”; b) Fourier series decomposition of the impulsive signal c) For each of the harmonics arising from the foregoing decomposition, calculation of a model specifically for the harmonic in question from the generic model previously elaborated; and d) superposition of a set of specific models thus calculated in order to assemble a final model.

Abstract: The invention relates to a device and method for estimating defects potentially present in an object comprising an outer surface, wherein the method comprises the steps of: a) illuminating the outer surface of the object with an inductive wave field at a predetermined frequency; b) measuring an induced wave field ({right arrow over (H)}) at the outer surface of the object; c) developing from the properties of the object's material a coupling matrix T associated with a depth Z of the object from the outer surface; d) solving the matrix system ? ? ? ( [ H ? 0 ? ? ] = T · J ? ) ? ? indicates text missing or illegible when filed in order to determine a vector ({right arrow over (J)}) at depth Z; e) extracting a sub-vector ({right arrow over (J)}S) from the vector ({right arrow over (J)}) corresponding to a potential defect on the object at depth Z; and f) quantitatively estimating the potential defect from the sub-vector ({right arrow over (J)}S) at depth Z.

Abstract: This eddy current imaging method includes the steps of: positioning (72), in the vicinity of a large inspection region, elements for the measurement of a surface magnetic field, generating (74, 92) a global exciting magnetic field over the observation inspection region, measuring (76, 84) a resultant magnetic field at the surface, in the form of images, processing (90) the images. The generating step (74, 82) involves generating a set of at least two exciting magnetic field waveforms; the measuring step (76, 86) involves measuring a set of configurations of the resultant magnetic field in the form of images; the step (90) of treating the images by combining them allows defects to be detected and the position and the nature thereof to be determined.

Abstract: This eddy current imaging method includes the steps of: positioning (72), in the vicinity of a large inspection region, elements for the measurement of a surface magnetic field, generating (74, 92) a global exciting magnetic field over the observation inspection region, measuring (76, 84) a resultant magnetic field at the surface, in the form of images, processing (90) the images. The generating step (74, 82) involves generating a set of at least two exciting magnetic field waveforms; the measuring step (76, 86) involves measuring a set of configurations of the resultant magnetic field in the form of images; the step (90) of treating the images by combining them allows defects to be detected and the position and the nature thereof to be determined.

Abstract: A method for evaluating the wall thickness of a hollow part, of the turbomachine blade type, at least at a point having a determined radius of curvature at this point, within determined ranges of radii of curvature and thicknesses, including the determination of impedance values of an electrical circuit formed by an eddy current detector applied to the wall, and the insertion of these values into a digital processing unit with a neural network, wherein the network parameters have been defined in advance by learning on spacers having a determined radius of curvature and thickness in the ranges.

Abstract: The present invention relates to a method for evaluating the wall thickness of a hollow part, of the turbomachine blade type, at least at a point having a determined radius of curvature at this point, within determined ranges of radii of curvature and thicknesses, comprising the determination of impedance values of an electrical circuit formed by an eddy current detector (20) applied to the wall, and the insertion of these values into a digital processing unit with a neural network, wherein the network parameters have been defined in advance by learning on spacers having a determined radius of curvature and thickness in said ranges.

Abstract: A quantitative magneto-optical imaging method is used to form an image of a target material. An active material is placed close to the target material and produces a Faraday rotation in a polarized light beam. The Faraday rotation of the active material is essentially proportional to the magnetization of the target material when this latter is subjected to an exciting magnetic field. Photodetector means detect the beam reflected after passing through the active material. The light from the reflected beam can then be analyzed for obtaining the amplitude and phase of an interfering magnetic field generated by a defect in the target material.

Abstract: A quantitative magneto-optical imaging method is used to form an image of a target material. An active material is placed close to the target material and produces a Faraday rotation in a polarized light beam. The Faraday rotation of the active material is essentially proportional to the magnetization of the target material when this latter is subjected to an exciting magnetic field. Photodetector means detect the beam reflected after passing through the active material. The light from the reflected beam can then be analyzed for obtaining the amplitude and phase of an interfering magnetic field generated by a defect in the target material.