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題名 | Study on the Anemometry Parameters to Improve the Accuracy of LDV Measurements=電射流速儀量測準確性之系統參數研究 |
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作者姓名(中文) | 蔡進發; 楊正財; 黃正利; 陳義男; | 書刊名 | 國立臺灣大學工程學刊 |
卷期 | 62 1994.10[民83.10] |
頁次 | 頁35-47 |
分類號 | 440.137 |
關鍵詞 | 雷射流速儀; 準確性; 系統參數; LDV; Accuracy; System parameters; |
語文 | 英文(English) |
中文摘要 | 本文以二維翼後近跡區之流場探討雷射流速儀系統的量測參數對流場 量測準確性的影響。分析時所考慮的系統參數為計數模式、濾波頻率、光波頻率 移位、以及最小可數干涉條紋數。文中定義了兩個新參數,由此二參數可取得較 佳的移位頻率及最小干涉條紋數的設定範圍。濾波頻率的設定則需由所估計的最 大與最小都普勒頻率決定,都普勒頻率則受流場特性與移位頻率的影響。由量測 資料顯示對一詞爆單一量測模式(SM/B)與總計數模式(TBC)的兩種量測模式,移 位頻率及最小有效干涉條紋對量測正確性有關鍵性的影響。研究結果對於使用與 本文類似之雷射流速儀系統或類似之量測設計,可獲取準確量測值的參數考量。 |
英文摘要 | The effects of laser-Doppler velocimeter (LDV) system parameters on the ac-curacy of measurements were studied with the flow field just behind the trailing edge of a two-dimensional hydrofoil. The system parameters considered in thisstudy were counting modes, filter settings, frequency shifting and minimum requiredfringes. Two new parameters were defined, and the more accurate shifting frequencies and minimum required fringes were obtained from these parameters. Thebandpass frequencies of filters were determined from the estimated minimum andmaximum Doppler frequencies which depended on the flow characteristics and theshifting frequencies. Frequency shifting and minimum required fringes were crucialto obtain accurate results in single measurement per burst mode (SM/B) and totalburst count mode (TBC). The results are helpful to flow measurements with a LDVsystem similar to this study or with similar measurement design. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。