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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 陳奕君 | zh_TW |
| dc.contributor.advisor | I-Chun Cheng | en |
| dc.contributor.author | 張子萱 | zh_TW |
| dc.contributor.author | TZU-HSUAN CHANG | en |
| dc.date.accessioned | 2025-04-24T16:06:47Z | - |
| dc.date.available | 2025-04-25 | - |
| dc.date.copyright | 2025-04-24 | - |
| dc.date.issued | 2025 | - |
| dc.date.submitted | 2025-03-28 | - |
| dc.identifier.citation | [1] The Business Research Company. (2017). Plastics Product Manufacturing Global Market Report. Philadelphia: The Business Research Company.
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/97316 | - |
| dc.description.abstract | 隨著全球塑膠污染問題日益嚴重，微塑粒(Microplastics)的檢測與量化已成為環境科學與水質監測領域的核心議題。其不僅對水體生態系統造成深遠影響，亦對人類健康構成潛在風險，因此發展高精度監測技術以評估其污染程度至關重要。本研究結合雷射杜卜勒流量計(Laser Doppler Flowmeter, LDF)、光學散射模型(Optical Scattering Model)與流體力學模型(Fluid Dynamics Model)，評估水體中微塑粒污染嚴重程度，並探討 LDF 在不同粒徑組成、濃度與通量條件下之適用性與解析能力。
本研究採用混和粒徑 1~4 µm及不同濃度微塑粒進行連續流場模擬實驗，透過 LDF 精確測量水體微塑粒灌流濃度，並將該訊號作為污染評估指標。基於光學散射理論分析 LDF 訊號如何受到微塑粒粒徑分佈、折射率與濃度變化影響，同時透過流體力學模型推導微塑粒運動行為，以確保測量結果的物理合理性。且在數據處理上進一步整合濾波技術與連續小波轉換(Continuous Wavelet Transform, CWT)進行訊號處理，成功提取關鍵特徵，增強數據穩定性並提升污染監測精度。 研究結果顯示，LDF 訊號與微塑粒水溶液濃度呈顯著正相關，當濃度自 5 µg/L 增加至 1000 µg/L，LDF 訊號穩定增強。未知濃度測量的擬合曲線分析(Curve Fitting Analysis)顯示其相關係數 R² = 0.92，證實 LDF 在不同污染濃度條件下均可提供穩定且準確的評估。此外，LDF 技術展現高度靈活性，適用於淡水、海水及不同污染程度水體，為未來低成本、高效率水質監測提供可行解決方案。 本研究不僅提出 LDF 在微塑粒水污染監測之新應用，更結合光學散射理論與流體力學模型，提升測量物理合理性與解析度，為環保政策制定及後續研究提供關鍵科學依據，以促進微塑粒污染防治與永續水資源管理。 | zh_TW |
| dc.description.abstract | With the escalating global plastic pollution crisis, the detection and quantification of microplastics have become central issues in environmental science and water quality monitoring. Microplastics pose significant threats to aquatic ecosystems and human health, making the development of high-precision monitoring technologies essential for assessing pollution severity. This study integrates Laser Doppler Flowmetry(LDF), Optical Scattering Models, and Fluid Dynamics Models to evaluate the severity of microplastic contamination in water bodies. It investigates the applicability and resolution of LDF under varying particle size distributions, concentrations, and flow conditions.
A controlled experimental setup was established using mixed microplastic particle sizes 1~4 µm and varying concentrations to simulate continuous flow conditions. LDF was utilized to quantify microplastic perfusion concentration, providing a robust indicator for pollution assessment. Optical scattering theory was applied to evaluate the effects of particle size distribution, refractive index, and concentration variations on LDF signals, while fluid dynamics modeling characterized microplastic transport behavior to ensure measurement validity. Advanced signal processing techniques, including filtering algorithms and Continuous Wavelet Transform(CWT), were implemented to extract key spectral features, enhance data stability, and refine pollution monitoring precision. The experimental results demonstrate a strong positive correlation between LDF signals and microplastic concentration in aqueous solutions. As the concentration increased from 5 µg/L to 1000 µg/L, the LDF signal exhibited a stable and significant enhancement. Further curve fitting analysis of unknown concentration measurements revealed a correlation coefficient of R^2=0.92, confirming the ability of LDF to provide consistent and accurate pollution assessments across different concentration levels. Moreover, LDF technology exhibits high flexibility and adaptability, making it suitable for application in freshwater, seawater, and various pollution levels, thus presenting a feasible and cost-effective solution for high-efficiency water quality monitoring. This study not only proposes a novel application of LDF in microplastic pollution monitoring but also integrates optical scattering models and fluid dynamics theories to enhance the physical validity and resolution of LDF measurements. The findings provide critical scientific evidence for environmental policy development and future research, contributing to microplastic pollution mitigation and sustainable water resource management. | en |
| dc.description.provenance | Submitted by admin ntu (admin@lib.ntu.edu.tw) on 2025-04-24T16:06:47Z No. of bitstreams: 0 | en |
| dc.description.provenance | Made available in DSpace on 2025-04-24T16:06:47Z (GMT). No. of bitstreams: 0 | en |
| dc.description.tableofcontents | 誌謝 i
中文摘要 ii ABSTRACT iii 目次 v 圖次 viii 表次 xi Chapter 1 緒論 1 1.1 研究動機 1 1.2 文獻回顧 6 1.2.1 全球各國微塑粒污染標準 6 1.2.2 非侵入式雷射杜卜勒技術的發展 9 1.2.3 不同非侵入式量測技術的比較與評估 15 1.3 研究目的 21 1.4 論文範疇 22 Chapter 2 研究原理與方法 26 2.1 雷射杜卜勒微流儀原理 26 2.1.1 杜卜勒位移光在微粒中的相互作用 27 2.1.2 相位調制與頻譜分析 30 2.1.3 粒子訊號的總強度與功率頻譜密度 31 2.2 光學散射模型(Optical Scattering Model) 33 2.3 Beer-Lambert 定律 37 2.4 Stokes-Couette 流體模型 40 2.5 流體準靜態條件(Quasi-Static State)之分析 46 2.5.1 準靜態流場之數學描述 46 2.5.2 LDF 訊號變化機制 48 2.6 訊號量測與處理 48 2.6.1 濾波器設計 49 2.6.2 連續小波轉換(Continuous Wavelet Transform, CWT) 52 Chapter 3 實驗架設與分析 56 3.1 儀器設備 57 3.1.1 LDF裝置 57 3.1.2 蠕動幫浦 59 3.2 樣本溶液配置 61 3.3 實驗環境與設備 66 3.4 LDF 訊號量測 68 3.4.1 散射模型 69 3.4.2 實驗條件下是否存在多重散射現象的分析 70 3.4.3 OPL計算 70 3.4.4 散射角與接收範圍的影響 73 3.4.5 非等向性散射光的角度分布: Henyey-Greenstein (HG) Phase Function 74 3.4.6 LDF訊號的頻譜強度公式推導 75 3.5 訊號處理與分析 76 Chapter 4 實驗結果與討論 83 4.1 不同粒徑微塑粒之散射影響分布 83 4.2 微塑粒濃度之臨界濃度計算與檢測範圍分析 84 4.3 不同濃度下LDF量測訊號的SNR分析 86 4.4 微塑粒濃度量測結果分析 88 4.5 微粒濃度擬合曲線 98 Chapter 5 結論與未來展望 102 5.1 結論 102 5.2 未來展望 103 參考文獻 107 | - |
| dc.language.iso | zh_TW | - |
| dc.subject | 微塑粒 | zh_TW |
| dc.subject | 連續小波轉換 | zh_TW |
| dc.subject | 流體力學模型 | zh_TW |
| dc.subject | 光學散射模型 | zh_TW |
| dc.subject | 水質監測 | zh_TW |
| dc.subject | 雷射杜卜勒流量計 | zh_TW |
| dc.subject | Optical Scattering Model | en |
| dc.subject | Water Quality Monitoring | en |
| dc.subject | Microplastics | en |
| dc.subject | Laser Doppler Flowmetry(LDF) | en |
| dc.subject | Continuous Wavelet Transform(CWT) | en |
| dc.subject | Fluid Dynamics Model | en |
| dc.title | 雷射杜卜勒流量計於水體污染評估之應用： 基於光學散射與流體動力學模型之整合分析 | zh_TW |
| dc.title | Application of Laser Doppler Flowmetry for Assessing Microplastic Pollution in Aquatic Environments: Integrated Analysis Based on Optical Scattering and Fluid Dynamic Models | en |
| dc.type | Thesis | - |
| dc.date.schoolyear | 113-2 | - |
| dc.description.degree | 碩士 | - |
| dc.contributor.oralexamcommittee | 李世光;蕭惠心;李舒昇 | zh_TW |
| dc.contributor.oralexamcommittee | Chih-Kung Lee;Hui-Hsin Hsiao;Shu-Sheng Lee | en |
| dc.subject.keyword | 雷射杜卜勒流量計,微塑粒,水質監測,光學散射模型,流體力學模型,連續小波轉換, | zh_TW |
| dc.subject.keyword | Laser Doppler Flowmetry(LDF),Microplastics,Water Quality Monitoring,Optical Scattering Model,Fluid Dynamics Model,Continuous Wavelet Transform(CWT), | en |
| dc.relation.page | 118 | - |
| dc.identifier.doi | 10.6342/NTU202500725 | - |
| dc.rights.note | 同意授權(限校園內公開) | - |
| dc.date.accepted | 2025-03-28 | - |
| dc.contributor.author-college | 電機資訊學院 | - |
| dc.contributor.author-dept | 光電工程學研究所 | - |
| dc.date.embargo-lift | 2025-04-25 | - |
| 顯示於系所單位： | 光電工程學研究所 | |
文件中的檔案：
| 檔案 | 大小 | 格式 | |
|---|---|---|---|
| ntu-113-2.pdf 授權僅限NTU校內IP使用（校園外請利用VPN校外連線服務） | 5.4 MB | Adobe PDF |
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