Application of envelope detection technique to ultrasonic distance measurement
| Autor: | Li, Bo-Lin, 李柏霖 |
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| Rok vydání: | 2014 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 102 Ultrasonic distance measurement systems are often used to measure or detect object because its structure is simple and low cost. The system have two basic measurement methods, one is time of flight which can detect long range but this method is always affected by the condition of environment, the other uses phase to calculate distance, although this method can improve accuracy of the system, the distance measured will reduce. The thesis proposes a new method that generates two frequency signals and uses power combiner to combine into an envelope signal used in the ultrasonic distance measurement system. When the frequency of envelope signal is low enough, distance can be measured is extended. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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