Design of α–alumina integrated ultrasound transducer for wireless power transmission system

Traditional ultrasound wireless power transmission (UWPT) technology often faces challenges such as low power transmission efficiency and safety concerns. This paper proposes a highly reliable α–alumina integrated ultrasound transducer–based ultrasound wireless power transmission (IUT–UWPT) system designed for metallic medium. The proposed system is capable of powering and communicating with embedded sensors inside metal–sealed tanks. An acoustic wave transmission model for the IUT–UWPT system is developed based on acoustic theory to optimize the thickness of the matching layer and bonding layers between piezoelectric ceramics and metallic medium. The effect of the α–alumina integrated ultrasound transducer on the input–output characteristics of the system is analyzed using the mason equivalent circuit method considering acoustic attenuation and finite element simulation. Experimental results show that, compared to traditional UWPT systems without α–alumina integrated ultrasound transducer, the IUT–UWPT system exhibits a broader frequency response range from 0.8 MHz to 1.2 MHz and achieves a 13.19 % increase in maximum output power. Notably, the insulating properties of the α–alumina integrated ultrasound transducer prevent electrical generation on the surface of the metal–sealed tank. This system is well–suited for health monitoring in storage facilities such as gas pipelines, liquid nitrogen tanks and nuclear waste containers.