| Summary: | 碩士 === 國立高雄應用科技大學 === 機械與精密工程研究所 === 99 === This study aims to investigate the feasibility of using the PVDF piezoelectric film to make a biting force sensor. In the early periods, materials, equipments and technologies were not as accomplished as the present technologies. Therefore, the tooth biting force measurement not only seemed to be a little bit rough, but also lacked perfect degree and efficiency that the modern science pursues. In the early researches, a few studies used available sensors to measure the biting force, and some used the MEMS (Micro-Electro Mechanical System) to reprocess the piezoelectric material. Those methods caused an increase of cost and consume more resources. Consequently, this study is to create a simple and easy fabrication to reduce the cost so that the sensor has the advantages of the low cost and the disposability.
These are nine kinds of sensors which have different structures and thickness in this study. It cuts PVDF piezoelectric film to a rectangular form and uses copper foil tape to conduct the wires, which can be substituted for the complex procedure of the MEMS process welding wires. Moreover, covering transparent tape or fiber tape outside of the sensor is to make it isolated and waterproof. The next step is to conduct a plane measuring. The experimental result has showed the sensor which uses a 28μm PVDF piezoelectric film covered with copper foil tape and fiber tape has a lower measuring error. Then, this study uses the sensor to test in a single-pair molar tooth biting.
The experimental results demonstrate that the sensor which uses a 28μm PVDF piezoelectric film covered with copper foil tape and fiber tape testing in 0 to 50 kg ,where every spacing is 5kg, has the maximum error of 3.94% and the minimum error of -0.33%. Furthermore, by contrasting the linearity between the measurement data and the theory value, it shows that they are not far apart. The above experiments conclude that the sensor has a great measure level in biting force measurement.
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