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題 名 | 超音波距離量測系統之設計=Design of an Ultrasonic Distance Measurement System |
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作 者 | 黃新賢; 陳坤宏; 黃志峰; | 書刊名 | 正修學報 |
卷 期 | 22 2009.11[民98.11] |
頁 次 | 頁53-67 |
分類號 | 440.12 |
關鍵詞 | 超音波; 雙頻率相位差法; 時間差; Ultrasonic; BFSK; Time-of-flight; |
語 文 | 中文(Chinese) |
中文摘要 | 本文描述一套高精確度的BFSK超音波距離量測系統,並提出一個有效率的演算法,它結合時間差和雙頻率相位差法,此演算法可得到較遠及精確的距離量測。以單晶片微控制器爲基礎設計BFSK訊號產生器與相位偵測器計算飛行時間差、雙相移及量測之距離計算,並將結果傳送到LCD顯示及PC作校正。以BFSK作實驗,其頻率爲40k與41kHz可得到解析度爲40kHz波長的0.05%,距離爲6000mm,精確度±0.05mm。本系統主要優點是高解析度、窄頻寬及容易實現。 |
英文摘要 | A highly accurate binary frequency shift-keyed (BFSK) ultrasonic distance measurement system for use in air is described. This paper presents an efficient algorithm, which combines both the time-of-flight method and the phase-shift method. The proposed method can obtain larger range measurement and high accuracy. A single-chip microcomputer-based binary frequency shift-keyed signal generator and phase detector was designed to record and compute the time-of-flight, two phase shifts and the resulting distance, which were then sent to either a LCD to display or a PC to calibrate. Experiments were done in air using BFSK with the frequencies of 40k Hz and 41k Hz. The resolution of 0.05% of the wavelength corresponding to the frequency of 40k Hz was obtained. The range accuracy was found to be within ±0.05 mm, with the range of over 6000 mm. The main advantages of this UDMS system are high resolution, narrow bandwidth requirement, and easy for implementation. |
本系統中英文摘要資訊取自各篇刊載內容。