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DOE OSTI · 22391266

Crack depth profiling using guided wave angle dependent reflectivity

Volker, Arno·Pahlavan, Lotfollah·Blacquiere, Gerrit
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Abstract

Tomographic corrosion monitoring techniques have been developed, using two rings of sensors around the circumference of a pipe. This technique is capable of providing a detailed wall thickness map, however this might not be the only type of structural damage. Therefore this concept is expanded to detect and size cracks and small corrosion defects like root corrosion. The expanded concept uses two arrays of guided-wave transducers, collecting both reflection and transmission data. The data is processed such that the angle-dependent reflectivity is obtained without using a baseline signal of a defect-free situation. The angle-dependent reflectivity is the input of an inversion scheme that calculates a crack depth profile. From this profile, the depth and length of the crack can be determined. Preliminary experiments show encouraging results. The depth sizing accuracy is in the order of 0.5 mm.

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42 ENGINEERING71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICSACCURACYCORROSIONCRACKSDAMAGEDATA TRANSMISSIONDEFECTSDEPTHLENGTHMONITORINGREFLECTIONREFLECTIVITYSENSORSTHICKNESSTRANSDUCERS

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Volker, Arno, Pahlavan, Lotfollah, Blacquiere, Gerrit. 2015-03-31. Crack depth profiling using guided wave angle dependent reflectivity. https://doi.org/10.1063/1.4914681

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