微粒子於溶液中操控之模擬

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姓名

王皓霆(Hao-ting Wang) 查詢紙本館藏

畢業系所

機械工程學系

論文名稱

微粒子於溶液中操控之模擬

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摘要(中)

本論文主要針對以聲波操控溶液中粒子來進行各種模擬討論，利用聲波聚焦透鏡之差異，在環境中，產生能量局部的低點，或稱聲勢阱，使粒子趨向此區，進而達到捉取、與控制之功能。相較舊式聲波聚焦元件，如聲懸浮器、指叉狀的表面駐波設計，本論文之技術，不需使用到兩個換能器兩兩搭配使用，只需單個元件搭配透鏡薄膜，所以實驗架設會相對精簡。
元件設計上，本論文參照空氣透鏡、聲阻抗匹配、菲涅爾半波帶等理論，設計多聚焦的聲波菲涅爾透鏡。在模擬上，本論文使用特徵頻域分析，用理想波源分別對空氣透鏡、不同聚焦環數、不同厚度、不同聚焦組合對聲透鏡進行聲壓場模擬與分析；接著利用聲壓場之模擬結果，進一步對粒子受力、粒子分布進行模擬與討論。最後，耦合聲、電、固等物理性質，針對實際元件進行模擬與討論。

摘要(英)

In this paper, we mainly discusses manipulation of particles in solution for many aspects by simulation. We produce partial potential well in simulation environment by using the difference of acoustic focusing lens, and the particles would tend to the area. Compared to old-style acoustic focusing elements, such as acoustic levitation, a interdigital design; we can use only a single element with a lens film to obtain acoustic trapping ability, so experiment erection will be relatively brief.
In this paper, we referred air reflector by acoustic impedance matching, and Fresnel half-wave zone theory to build acoustic Fresnel lens. In the simulation, we analyze feature of sound pressure field by frequency domain, and discuss different situation, such as variation of ring number, variation of thickness, and combinations of acoustic lens with different focal length; then we analyze particle distribution by result from sound pressure field simulation; finally, we coupling some physical properties, such as sound, electricity, solid, to simulate real physical situation.

關鍵字(中)

★ 空氣透鏡
★ 聲阻抗匹配
★ 菲涅爾半波
★ 多聚焦

關鍵字(英)

★ Acoustic tweezer
★ Acoustic impedance
★ Fresnel half-wave zoom
★ Multi-focusing

論文目次

摘要 i
Abstract ii
誌謝 iii
目錄 iv
圖目錄 vi
表目錄 ix
符號說明 ix
第一章緒論 1
1.1 前言 1
1.2 研究動機與目的 1
1.3微粒聲波捕捉技術背景 4
144本文架構 8
第二章設計理論 9
2.1惠更斯－菲涅耳原理 9
2.2菲涅爾半波帶 9
2.2.1菲涅爾半波帶原理 9
2.2.2菲涅爾半波帶高度 13
2.3駐波 14
2.4貝塞爾波束(Bessel beam) 15
2.5波束捕獲粒子原理 17
2.6聲衰減 (Sound attenuation) 19
2.6.1斯托克斯阻力（Stokes′ drag） 21
2.6.2 Storkes聲衰減定律 22
第三章空氣透鏡原理與設計 23
3.1聲波透鏡 23
3.1.1 二進制菲涅爾透鏡 (BINARY FRESNEL LENS) 23
3.1.2法布里 - 珀羅共振聲波透鏡 24
3.2空氣反射器 (Air reflector) 25
3.3聲波阻抗 (Acoustic impedance) 25
3.4元件設計 26
3.4.1元件尺寸 28
第四章模擬分析 29
4.1數值方法 29
4.2環境介紹 30
4.3元件模擬之數值模組選用與流程 31
4.3.1 網格測試 31
4.4聲波透鏡之模擬與分析 32
4.4.1模擬環境與材料選擇 33
4.4.2聲邊界條件設定 35
4.4.3模擬結果討論 35
第五章結論與未來展望 62
5.1 結論 62
5.2 未來展望 63
5.2.1實驗設置 63
5.2.2未來模擬 64
第六章參考文獻 65

參考文獻

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指導教授

陳世叡(Shih-jui Chen)

審核日期

2015-11-17

推文