Through metal acoustic power transfer is an emerging wireless solution for battery charging in hazardous and sensitive environments where electronics are enclosed within sealed metal structures without electrical feed through. Power transfer is achieved utilizing reverse and direct piezoelectric effects via acoustic wave propagation through the metal barrier. The achievable power, often targeting hundreds of watts, is strongly influenced by different factors, such as, material properties, geometry, dimensions of the metal and piezo, and their bonding, making maximization of power transfer capability critical. This work experimentally investigates the terminal electrical characteristics of multiple prototypes, representing realistic scenarios. It compares power transfer capability in thickness and radial resonance modes for piezo metal assemblies, enabling appropriate mode selection and power electronics interface design. A figure of merit (FOM) is proposed for rapid screening and ranking of configurations as far as the power transfer capability is concerned.
Wearable ultrasound enables continuous monitoring of physiological processes such as muscle dynamics, bladder volume, and cardiovascular activity. Existing fully wearable ultra-low-power platforms are limited to shallow, low-channel A-mode sensing, while larger multi-mode systems…
The proliferation of Internet of Things (IoT) devices and wearable health monitors has created an urgent demand for ultra-low-power analog-to-digital converters (ADCs). Successive approximation register (SAR) ADCs are widely used in such applications, yet their energy efficiency…
In this paper, we revisit the problem of an encrypted model predictive control (MPC) design, representing a significant challenge in the recent field of secure process control. Existing methods in secure optimization-based control are non-existent and even partial implementation…
We study trajectory prediction from libraries of stored output templates. Given the past of an unknown trajectory, the goal is to predict its future without identifying the state-space model that generated it. We show that libraries of trajectories generated by one or more dynami…
Underwater wireless optical communication (UWOC) is an enabling technology for high-throughput subsea networks, yet its long-term deployment is constrained by the finite energy budget of underwater nodes. To address this challenge, we investigate a mobile system wherein an autono…
We present induction-heated resonant reactors, a new concept in electrified thermochemistry in which the reactor itself serves as a volumetric electromagnetic resonator heated through resonant wireless power transfer. We use the Swiss roll resonator as a model system and show tha…