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

Electricite De France

Guillemette Ribay

Olivier Mesnil

Fabienne Rupin

A method for detecting a defect in a structure of a device includes generating, only using the device, a low-frequency signal that makes the structure vibrate, generating a high-frequency signal in the structure, and measuring a vibratory signal caused by the generated low-frequency and high-frequency signals at the same time then adaptively re-sampling these measurements to obtain a re-sampled vibratory signal the power spectrum. The resampling includes a first frequency range [u; u] of width larger than 5 Hz that contains 95% of the power of the low-frequency signal, a second frequency range [u; u] of width systematically smaller than uthat contains 95% of the power of the low-frequency signal. A defect is signaled in the structure if an additional power lobe is detected outside of the ranges [u; u] and [u; u].

Method for detecting a defect in a structure of a device

A device and method for inspecting and measuring weld defects in a cylindrical wall of a cylindrical conduit. The device can include an inspection head forming a probe having a proximal end and a distal end along its longitudinal axis, and of which a first side called 'inner side' is provided with at least one ultrasound wave transducer. The inspection head can include a second side, called 'outer side' opposite the first side that has a curved surface in the form of a cylinder fraction, and wherein the curved surface of the second side has outward facing convexity. The wave transducer can be formed of a series of juxtaposed elements, each element being both a transmitter and receiver, wherein a surface of the series is curved and in the form of a cylinder fraction, and wherein the surface of the series has outward facing concavity.

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Bourg la Reine, France

Guillemette Ribay