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AssigneeCommissariat A L'energie Atomique Et Aux Energies Alternatives
InventorsTom Druet, Olivier Mesnil, Bastien Chapuis
Estimating the term…
Methods and devices are provided for analyzing a tubular structure including at least two electromagnetic-acoustic transducers (EMAT) and, called sensors, attachable or attached in, on or in the vicinity of the tubular structure; and computation and/or memory resources, that are accessed locally and/or remotely and that are configured to determine, for the pair of sensors, a function representing the impulse response of the tubular structure on the basis of the diffuse acousto-elastic noise present in the structure. Developments describe the use of rings supporting the sensors; translation and/or rotation movements; permanent or temporary installations; hinged rings; various computation modes, e.g., intercorrelation, a passive inverse filter, or correlation of the coda of the correlation; the use of artificial noise sources, imaging (e.g., tomography) for determining the existence of one or more defects in the structure. Software aspects are described.
A system for analyzing a tubular structure comprising:
A method for analyzing a tubular structure, with at least two electromagnetic-acoustic transducers (EMAT), being at least a pair of sensors supported by two rings disposed around the tube to be inspected, and being located at a configurable distance, being a liftoff, from the tubular structure, the method comprising a step of deciding a time to measure the ambient noise in the tubular structure and of determining, for the at least pair of sensors, a function representing the impulse response of said tubular structure on the basis of the diffuse acousto-elastic noise measured in the structure, with computation or memory resources that are accessed locally or remotely, said determining of the function representing the impulse response for each pair of sensors being carried out by intercorrelation or by a passive inverse filter or by correlation of a coda of the correlation.
Dependencies are inferred from the claim text.