Guided waves in empty and filled pipes with optimized magnetostrictive transduction
This paper considers the design of magnetostrictive transducers for the excitation and detection of guided waves in pipes, as part of an apparatus for monitoring pipeline contents in a chemistry laboratory. The transducer design and sensitivity were optimised on the basis of equivalent electrical circuits, the guided wave excitability function and a frequency-domain filter based on the effect of the dynamic magnetic field on the excitable spatial wavenumbers. Experiments were carried out on pipes with different contents - empty, water, and supercritical CO2. Reassigned Spectrogram analysis of the results enabled the pipe contents to be differentiated on the basis of resolving the guided wave modes.
KeywordsDispersion Curve Group Velocity Dispersion Guided Wave Equivalent Electrical Circuit Spiral Coil
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