| Summary: | 碩士 === 國立臺灣海洋大學 === 系統工程暨造船學系 === 103 === In recent years, the wearable electronics plays an important role in the daily life. In the medical field, physiological data of users could be recorded in real time by personal digital assistants, e.g. athletes adopt the wearable electronic to record physiological basic information and amount of exercise; moreover, patients with diabetes also adopt the devices with pressure sensors to measure foot pressure. Nowadays pressure sensors with large area often use array elements to achieve the measurement. Due to manufacturing process of the pressure sensors have to be fabricated quickly and simply, wires are used to connect in series between array components. Thus, lots of unnecessary noise is generated in the sensor system, especially crosstalk between the array elements are the most serious problem. A simple grounding method is presented in this study to solve the impact of parasitic capacitance with crosstalk and to improve the sensitivity of floating circuits. While capacitance changes were affected by crosstalk in the floating circuits exceed in 10 fF, the crosstalk-effect in capacitive array can be reduced by 66.67%. A capacitive array pressure sensing system with minimum parasitic effect is presented in this study to achieve multi-point pressured measurement. The pressure recognized range of the capacitive array elements are from 0.211 kg/cm2 to 0.306 kg/cm2. Furthermore, multi-point measurement can be accomplished at various pressure conditions, varied pressure values can be identified with well precision.
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