Evaluation of Electromagnetic Radiative Noise Magnetostrictively Coupled to Elastic Vibrations in Steel Pipes

An experimental and theoretical study was conducted on the generation of electromagnetic radiative noise produced by elastic wave vibrations in a steel pipe. Vibrations were introduced into the pipe, which in turn introduced current in a coil wrapped around the pipe inside a larger coil that produced a bias field. Based on the current developed by the vibrations, it was established, using modeling, that the predicted radiative noise agreed with the general range of radiative noise measured by others in similar situations where elastic vibrations were present, even in the presence of stress.