Acoustic Guided Wave Testing of Pipes of Small Diameters

[摘要] Acoustic path is analyzed and main parameters of guided wave testing are substanti- ated applied to pipes of small diameters. The method is implemented using longitudinal L(0,1) and torsional T(0,1) waves based on electromagnetic-acoustic (EMA) transducers. The method of multiple reflections (MMR) combines echo-through, amplitude-shadow and time-shadow methods. Due to the effect of coherent amplification of echo-pulses from defects the sensitivity to the defects of small sizes at the signal analysis on the far reflections is increased. An oppor- tunity of detection of both local defects (dents, corrosion damages, rolling features, pitting, cracks) and defects extended along the pipe is shown.

[发布机构] Department of Quality Control Instruments and Techniques, Kalashikov Izhevsk State Technical University, 7 Studencheskaya st., Izhevsk; 426069, Russia^1

[效力级别] 机械制造

[关键词] Acoustic path;Corrosion damage;Guided wave testing;Local defects;Main parameters;Multiple reflections;Shadow method