| Summary: | 碩士 === 國立臺灣大學 === 工程科學及海洋工程學研究所 === 107 === This study uses gas as the ultrasonic sound transmission medium. Since the transducers used is pulse-echo, the ultrasonic waves interfere with each other when they are transmitted. So that when the signal is received, the wave packets will overlap each other, causing misjudgment. It is difficult to clearly receive echoes without an echo amplifier circuit. Therefore, multiple acrylic tubes are used as shields to guide the self-receiving transducers to measure the liquid level. At the same time, the change of the mechanism is utilized to amplify the echo energy so that the echo signal can be received. When the liquid level is stationary, the current liquid level position can be reversed by measuring the inclination angle of the liquid surface by the acrylic tube mechanism. If the liquid level is under linear shaking, the average liquid level can be calculated through the sloshing process of the liquid surface. The longitude can reach ±0.5cm or less, and the measurement result can be more accurate and stable at low cost. Operates with a wider range of applications.
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