| Summary: | 碩士 === 國立成功大學 === 電機工程學系碩博士班 === 90 === Resonance is a phenomenon of physics, it is a state of transformation that energy can transfer into port with maximum power. According to electric circuit theory, reactance are cancel each other and total impedance keep real resistor, have some analogy with human body. By Wang W.K and Lin Y.Y, “the Resonance Effect on Blood Pressure and Flow hypothesis”, there have resonant frequency in vitals.
Our study is to develop a measurement system for detecting resonant frequency. These resonance frequency have a characteristic from 1.2Hz to 10Hz, it have a low frequency and small displacement. In our approach, we construct a underwater model that imitate vitals. We use ultrasonic transducer to detect vibrate signal and count by CPLD, then transmit the count data to 89C51. In 89C51, we built in the new phase difference algorithm and show the result by PC. By experiment result, we have a good estimation for simulated organ micro-vibration frequency.
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