Abstract
The investigation of the wireless ultrasonic energy and signal transmission through metal barrier into hermitical metallic structures has become an interesting field of research. The most often constructed acoustic-electric ultrasonic power transmission channels are based on piezoelectric transducers. Effective modeling methods with accuracy are essential to the performance prediction and optimal design of such channels. Up to now, there exists a variety of modeling methods including theoretical analytical method, equivalent circuit method, two-port network method, and finite element modeling method. However there is a little chaos about how to choose an appropriate modeling method among them. There is also a lack of a systematic modeling framework presented involving principles, advantages, disadvantages, and constraint conditions of these methods. In this review, a common modeling framework for through-metal-wall acoustic-electric channels based on piezoelectric transducers is presented. The principles of the major modeling methods are introduced and the adoptability and constraints of each method are discussed. For each modeling method, simulation and or experimental results are also presented to validate the accuracy of the corresponding modeling method.
Highlights
Wireless sensing and health monitoring of closed metal structures requires the use of physical penetrations and wire feedthrough to power embedded sensors
The modeling framework for throughmetal-wall acoustic-electric channels based on piezoelectric transducer has been established, which is expected to be helpful to optimal design and performance prediction of through-metal-wall ultrasonic power transmission channels
As for the wireless ultrasonic power transmission system configure shown in Figure 3, the channel consisting of a pair of piezoelectric transducers, epoxy coupling layers, and planar metal barrier can be viewed as a ‘black box’
Summary
Wireless sensing and health monitoring of closed metal structures requires the use of physical penetrations and wire feedthrough to power embedded sensors. The majority of the acoustic-electric channels are designed for through planar metal barrier based on piezoelectric transducers (PZTs). The PZT outside of the metallic structure generates ultrasonic mechanical vibrations, which propagate through the planar metal barrier, and the internal transducer receives ultrasound waves and converts them into electric energy. The modeling framework for throughmetal-wall acoustic-electric channels based on piezoelectric transducer has been established, which is expected to be helpful to optimal design and performance prediction of through-metal-wall ultrasonic power transmission channels. Based on the acoustic-electric equivalent principles, equivalent circuit modeling methods are potential to overcome these shortcomings
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