Interaction of Acoustic and Electromagnetic Waves in Nondestructive Evaluation and Medical Applications
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Radiophysics and Quantum Electronics, Vol. 63, No. 1, June, 2020 (Russian Original Vol. 63, No. 1, January, 2020)
INTERACTION OF ACOUSTIC AND ELECTROMAGNETIC WAVES IN NONDESTRUCTIVE EVALUATION AND MEDICAL APPLICATIONS A. M. Sutin∗ and H. Salloum
UDC 534.8.081.7+537.867
Nonlinear acoustic nondestructive evaluation (NA NDE) methods have a higher sensitivity for defect detection than standard methods. These methods use various kinds of acoustic wave interactions. In this paper, we suggest augmenting the acoustic framework and use the interaction between acoustic and electromagnetic waves. A brief review of NA NDE and medical nonlinear acoustic imaging methods is presented. Medical methods based on electromagnetic wave modulation by an acoustic radiation force are discussed where improvements using ultrasound contrast agents are suggested. The estimation of the modulation of a radar signal by a crack vibration were made based on standard static measurements. The effects of modulation of an acoustic wave by an electromagnetic field are briefly considered for the method of crack detection in metal materials. The effects considered in this paper may be used in the new methods of NDE and medical diagnostics.
1.
INTRODUCTION
Over the last two decades, studies of nonlinear acoustic effects for applications in medical nonlinear acoustic imaging and nonlinear acoustic non-destructive evaluation (NA NDE) 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 materials that lead to a high sensitivity of nonlinear material properties in the presence of a defect. High sensitivity of NA NDE methods attracted the attention of many researchers, where more than 20 different NA NDE methods were investigated. The nonlinear acoustic techniques have found wide applications in medical diagnostics. The NA NDE and nonlinear acoustic medical diagnostic methods are based on various kinds of interaction of acoustic waves. We consider the extension of the acoustic framework and use the interaction between acoustic and electromagnetic waves. This work gives a brief review of NA NDE methods and presents a very large amount of research on NA NDE and NA acoustic medical imaging. However, the interaction between acoustic and electromagnetic waves is not examined that much. We only know one group of work where the effect of microwave modulation by acoustically induced tissue motion was explored for breast cancer detection. We suggest improving this method by applying microbubbles for enhancing microwave modulation by acoustically induced motion. The microbubbles can lead to a large increasing the tissue displacement under the action of ultrasonic waves due to the new non-dissipative mechanism of the radiation force. This new effect, together with the enhancement of electromagnetic contrast in the presence of microbubbles may lead to a significant increase in the sensitivity of the Harmonic
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