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PZT 주파수 특성 분석 및 유연 1-3 복합 초음파 트랜스듀서 제작
임현철(Hyeoncheol Lim),김회준(Hoe Joon Kim) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
This study reports a flexible piezoelectric transducer based on 1-3 mode PZT and PDMS composite structure. The thickness of PZT is about 0.3 mm which gives a resonant frequency of 2 MHz. For device design, we have performed a COMSOL study to predict the frequency response and relative acoustic pressure of the device with varying dimensions. To make rigig PZT into a flexible form, we diced the PZT film in 150 μm by 150 μm sized pixels and coated the PZT arrays with PDMS. Our simulation and measurement match well and the fabricated device bends without any damage under pressure. In later state, we will metallize the device and perform further device characterization. In addition, we will use the device as a source and a sensor for ultrasound measurements for bio-healthcare applications.
MWCNT 표면 코팅을 통한 3D 프린팅 기반 자이로이드 구조의 압력 센서
김항겸(Hang-Gyeom Kim),김남중(Namjung Kim),김회준(Hoe Joon Kim) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
This paper reports the fabrication and characterization of a pressure sensor with multi-walled carbon nanotube (MWCNT) surface coated gyroid structure using fused filament fabrication (FFF) three-dimensional (3D) printing of foaming thermoplastic polyurethane (TPU). 3D printing technology offers a faster fabrication of complex structures with various materials. The gyroid structure is mechanically robust despite low density. And it can easily tune mechanical properties with changing packing density or cell density. In this work, we develop a pressure sensor with gyroid structure coated with MWCNT. Herein, the gyroid structure printed with foaming TPU filament swelled the polymer chains using the ethyl acetate solvent and then firmly coated with MWCNT to the surface to give electrical properties. We characterize mechanical, electrical properties of pressure sensor with various packing densities. And by calibrating the response of an applied force, we can quantify pressure. We believe the proposed sensor is suited for human motion monitoring systems.