27 March 2018 Piezoelectric charging and wireless communication
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Modern medicine is undergoing a revolution in the application of new sensor capabilities for aiding in diagnosis of specific conditions and monitoring a variety of informative vital signs. In the past, many of the measurements were limited by what could be accomplished externally. A shift toward in-vivo monitoring for both diagnostic and therapeutic sensing and actuation [1] has created a need for low power electronics, high energy density batteries and methods to successfully power devices embedded in the body. For a review of the field and sensing capabilities see [2]. Recent studies suggest that charging with ultrasound is more efficient at longer transmission distance (< 10cm) than inductive charging [3]. In this manuscript, we discuss the modeling and experimentation that we have accomplished and demonstrate in ultrasonic charging of sensors having the form and fit of in-vivo sensors. The task goal has been to use piezoelectric transducers for wireless communication and powering of sensors internal to the human body with a goal to transmit power levels of 100 μW a receiver with receiving area of 3x3 mm2 over a distance of 16 cm equivalent to human body interior. The results suggest that we can transmit power levels that exceed this baseline requirement.
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Hyeong Jae Lee, Hyeong Jae Lee, Xiaoqi Bao, Xiaoqi Bao, Stewart Sherrit, Stewart Sherrit, Yoseph Bar-Cohen, Yoseph Bar-Cohen, Mircea Badescu, Mircea Badescu, Shannon Jackson, Shannon Jackson, } "Piezoelectric charging and wireless communication", Proc. SPIE 10598, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2018, 1059810 (27 March 2018); doi: 10.1117/12.2296645; https://doi.org/10.1117/12.2296645

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