碩士 / 國立臺灣大學 / 工程科學及海洋工程學研究所 / 105 / Transceiver system has many applications such as Sediment Concentration System, Wireless Charging System and Fish Detecting System. However, the environment variation under these usages include temperature and pressure which would remodel equivalent circuit and drift the ideal driving frequency. This drawback not only causes efficiency loss in short term, but also highly possible damages the transducer in long term. Therefore, this research creates a sweep circuit system to adjust driving frequency at ideal point under unstable environment. The core of the system is using DDS as transmitting circuit and use ARM as microcontroller. The experiment shows the system can track ideal driving frequency under temperature, pressure variation, and the efficiency can increase 6%~25% after tracking.
The principal of Sediment Concentration System depends on the attenuation of receiving power which is proportional to concentration. Based on the frequency power law, different frequency will affect the degree of attenuation. In transceiver system, the frequency response is located near the mid-band frequency which can only be driven at specific region. In order to improve the frequency response, this research use inductance matching to expand the bandwidth, and then measure the concentration via different frequency.
| Identifer | oai:union.ndltd.org:TW/105NTU05345024 |
| Date | January 2017 |
| Creators | Wei-Feng Lee, 李維峯 |
| Contributors | Chia-Chi Sung, 宋家驥 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 74 |
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