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A review of industrial ultrasonic power and communication systems and lessons towards medical applications

The use of ultrasound in producing wireless powering and communication links, primarily used to transmit through metallic walls as a form of penetration free feedthrough, has been of significant interest recently. These ultrasonic feedthroughs enable sensing in environments which are otherwise inaccessible or dangerous to instrument, such as the interiors of nuclear containment vessels or the external hulls of submersibles. A review of these types of systems will be presented which summarizes the technologies and capabilities developed both at Rensselaer, with support of industry sponsors, and by others; considering both low-rate and high-rate sensing with power delivery support. Parallels and differences will be explored between the systems employed to provide such connections across or along rigid structures and applications involving communication with biologically implanted devices, generally focusing on the challenges present in producing effective ultrasonic channels with respect to both power transmission efficiency and data link bandwidth characteristics.