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Tuesday, July 9 • 11:30 - 11:50
INTERACTION OF ACOUSTIC AND EM WAVES IN NDE AND MEDICAL APPLICATIONS

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Over the last two decades, studies of nonlinear acoustic effects in engineering materials have steadily intensified. Numerous nonlinear static and dynamic observations demonstrated that the macroscopic nonlinearity in a material is highly dependent on the amount of micro-inhomogeneous imperfections (defects) in the material that leads to high sensitivity of nonlinear material properties to defect its presence. High sensitivity of the Nonlinear Acoustic NDE (NA NDE) attracted attention of many researches and more than 20 different NA NDE methods were investigated. We suggest to augment the acoustic framework and use the interaction between acoustic and Electro-Magnetic (EM) waves. Recently, the effect of microwave modulation by acoustically induced motion was investigated for breast cancer detection. A similar modulation effect can be effective for crack detection. This method could be based on the combination of the microwave crack detection system with the acoustic crack excitation. Experiments with microwave crack detection demonstrated that the EM signal reflected from a crack depends on the crack opening. This means that variations of the crack opening by acoustic waves lead to the modulation of the EM field. We used known data for the dependencies of the EM signal from the crack opening for the estimation of the modulation index and demonstrated the feasibility of the modulation effect for crack detection. Another nonlinear effect is the modulation of acoustic waves by the modulated EM wave. In medicine, this modulation can exploit the fact that cancer tissues have different acoustic and EM properties than healthy tissues. In NDE applications, the modulation can be produced by variation of the acoustic parameters of the materials with defects under the action of microwaves. We plan to start experimental investigations of this effect.


Tuesday July 9, 2019 11:30 - 11:50 EDT
Westmount 1

Attendees (7)