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Conference Paper
Development of Double Matching Layer for Ultrasonic Power Transducer
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- Authors
- Gunn Hwang, WooSub Youm, Sung Q Lee
- Issue Date
- 2016-07
- Citation
- International Congress on Sound and Vibration (ICSV) 2016, pp.1-6
- Language
- English
- Type
- Conference Paper
- Abstract
- The ultrasonic transmitter is designed for implantable devices in human body to supply electric power. For implantable devices, it is necessary to design a wireless power unit with rechargeable batteries. The ultrasonic power transmission system consists of two piezoelectric transducers, facing each other between skin tissues and converting electrical energy to mechanical vibration energy or vice versa. The ultrasonic power transmission system is free from the electromagnetic coupling effect and medical frequency band limitations which making it a promising candidate for implantable devices. This paper is focused on the development of the double matching layer of ultrasonic transmitter to maximize energy conversion efficiency. The double matching layer of the transmitter is calculated based on the acoustic impedance theory, designed through numerical analysis, and tested to get the optimal matching layers thickness of the ultrasonic transmitter with the 1-3 composite piezoelectric ceramic structure of 30 mm diameter, 3 mm thickness. The tested 1-3 composite piezoelectric ceramics is PMN-30PT. The polyox-ymethylene (POM), also known as acetal and polyacetal, and a titanium(Ti) layer for biocom-patibility packaging are chosen as base materials of the matching layer. The maximum energy conversion efficiencies of the optimal matching layer of the transmitter are 79.4 % at 1.1 mm thickness of POM matching layer and 67.5 % at 1.1 mm thickness of POM matching layer and 0.2 mm thickness of Ti layer for PMN-30PT, experimentally.
- KSP Keywords
- 1-3 Composite, 2 mm, Acoustic impedance, Ceramic structure, Conversion efficiency(C.E.), Coupling effects, Electric power, Electromagnetic coupling, Human body, Implantable devices, Layers thickness