本研究的目的在於設計製造出一種超音波擴散聲場，以改善建設性生物超音波照射不均的問題，在實務應用上就能夠提高照射效率，並降低樣本因照射聲場不均所造成的差異。本研究所設計的改良式擴散聲場，將其壁面調整為互不平行，並加入凸透鏡形狀之聲透鏡構造，並與同樣調整過壁面而不含凸透鏡構造的傳統擴散聲場，運用有限元素法分析並比較改良式與傳統擴散聲場間差異，最後將兩種聲場應用於淡水小球藻，以誘發超音波生物效應。一般產生超音波聲源的超音波探頭在激發時，其聲能量集中於換能器前端，具明顯指向性且呈現高斯分布情形。本研究為了改善聲場均勻性，於超音波探頭前端選用壓克力製成之凸透鏡用來發散超音波，並且將四周壁面微調使之不互相平行。研究結果顯示經多重反射後達穩態時，加裝凸透鏡的對照組與不含此構造之聲場相比，在能量的分布上更加均勻，且照射死角之陰影區能有效降低。運用水中麥克風實際量測製作的模型可知，傳統擴散聲場聲強標準差為1.46 dB，而改良式擴散聲場為0.76 dB。本研究接著運用傳統擴散聲場及改良式擴散聲場，並配合Rayleigh-Plesset的空孔振動理論以淡水小球藻的自然頻率進行照射，經過超音波照射的微藻具有生長速率提昇的效果，並且能更快達到該培養環境下的生長靜止期，使用改良型擴散聲場約能提早兩天，而傳統擴散聲場則約能提早一天到達靜止期。在藻類數量增益方面，改良式擴散聲場第二至第五天生長增益為24.5%、38.4%、35.6%、38.9%，而傳統擴散聲場增益為18.4%、35.3%、20.0%、18.7％、14.8%。本研究設計的改良式擴散聲場，使聲場中聲能分布更均勻，在超音波生物效應下，淡水小球藻的生長率增益也能供業界參考應用，以利提升生產效率。

The objective of this study is to develop an ultrasonic diffusion field and improve the uniformity of distributed sound energy while inducing constructive ultrasonic bio-effect. The irradiation efficiency can be increased by such ultrasound irradiation field as described in practical application which reduces individual differences caused by the uneven sound energy distribution. In this study, optimized diffusion field boundaries are adjusted to be non-paralleled to each one and equipped with convex acoustic lens. The traditional diffusion field design is also boundary-adjusted but without the convex lens. The finite element method is utilized to analyze the differences between optimized and traditional diffusion field design, and the solution of Chlorella vulgaris is placed in these diffusion fields in comparison and observe the actual ultrasonic bio-effect of this application. While exciting an ultrasound transducer, the sound energy distribution concentrates in front of the transducer which has strong directivity and forms Gaussian distribution pattern. In this study, a convex acoustic lens made of acrylic is placed in front of the ultrasound transducer which is used to diverge sound energy. The results show that ultrasound reflects for multiple times between non-parallel walls, the sound energy distributes more uniformly and less shadow zone in the optimized diffusion field compared with traditional diffusion field. The sound intensity level deviation of traditional and optimized diffusion field model is 1.46 and 0.76 dB respectively, which is measured by hydrophone. The traditional and optimized ultrasonic diffusion field is utilized to irradiate the algae solution with ultrasound at its resonance frequency which is calculated by Rayleigh-Plesset cavitation theory. The growth rate of Chlorella vulgaris has increased while the microalgae growth stationary phase can be reached about two days in advance for the case with optimized diffusion field and about one day for the case with traditional diffusion field. With regard to enhancement for the biomass yield, the algae biomass has 24.5%, 38.4%, 35.6%, 38.9% greater than the control sample without ultrasonic treatment from the second to fifth day in incubation period, and 18.4%, 35.3%, 20.0%, 18.7%, 14.8% for the case utilizes the traditional diffusion field. An optimized ultrasonic diffusion field is designed in this study, and the sound energy distribution is more uniform in such irradiation field. The enhancement of the Chlorella vulgaris growth rate induced by ultrasonic bio-effect could be a reference for industry applications and increases the productivity.

論文審定書 i
誌謝 ii
中文摘要 iii
英文摘要 iv
目錄 vi
圖目錄 x
表目錄 xiii
第一章 緒論 1
1.1 前言 1
1.2 文獻回顧 3
1.3 研究動機與方法 8
1.4 全文概述 9
第二章 基本理論 12
2.1 超音波擴散聲場建構 12
2.2 凸透鏡模擬及構思 14
2.3 超音波生物效應簡介 15
2.3.1 熱效應 16
2.3.2 機械效應 16
2.3.3 超音波的空孔原理 16
2.3.3.1 穩態空孔 17
2.3.3.2 暫態空孔 17
2.4 Rayleigh-Plesset方程式 17
第三章 實驗方法與步驟 20
3.1 模擬模型設定及聲場量測設定 20
3.1.1凸透鏡的選用 22
3.2 實驗設備 23
3.2.1 血球計數盤 23
3.2.2 光學顯微鏡 24
3.2.3 微量吸量管及吸管尖 24
3.2.4 錐形瓶及血清瓶 24
3.2.5 高溫、高壓及高濕滅菌釜 25
3.2.6 精密恆溫震盪培養箱 25
3.2.7 無菌操作台 26
3.2.8 數位示波器 26
3.2.9 訊號產生器 26
3.2.10 微型PVDF水下麥克風探針 27
3.2.11 訊號前置放大器 27
3.2.12 水浸式超音波探頭 27
3.3 淡水小球藻 29
3.4 藻類的培養過程及計數方式 29
3.4.1 藻類的培養環境 30
3.4.2 計數方式 31
3.5培養液介紹 32
3.6 超音波照射實驗 33
3.6.1 超音波的照射試驗 33
3.6.2 超音波頻率 34
3.6.3 超音波聲強度 34
3.6.4照射時間及激振脈衝佔空比 35
3.7 綠藻實驗方法與步驟 35
3.7.1 不同初始濃度實驗 36
3.7.2 不同培養液實驗 36
第四章 綠藻生長實驗方法與步驟 53
4.1 不同曲率凸透鏡運用 53
4.2 傳統及改良式擴散聲場數值模擬結果 56
4.3 聲場達穩態時間分析 57
4.4 實際量測聲場結果 58
4.5 綠藻的培養 59
4.5.1 不同初始綠藻濃度培養 60
4.5.2 不同培養液綠藻培養 60
4.6 綠藻標準生長曲線測定 61
4.7 不同聲場下超音波照射綠藻實驗 62
4.7.1 綠藻生長機制變化 62
4.7.2 改良式與傳統擴散聲場之照射效果討論 62
第五章 結論與建議 85
5.1 結論 85
5.1.1 擴散聲場設計 85
5.1.2 綠藻照射實驗 86
5.2 未來展望 87
參考文獻 88
附錄A 92
A.1 波動方程式 92
A.2 介質的粒子速度與粒子加速度 93
A.3 超音波的強度與能量 93

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