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DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 闕志達(Tzi-Dar Chiueh) | |
dc.contributor.author | Li-Dek Chou | en |
dc.contributor.author | 周立德 | zh_TW |
dc.date.accessioned | 2021-06-15T06:48:35Z | - |
dc.date.available | 2016-07-06 | |
dc.date.copyright | 2011-07-06 | |
dc.date.issued | 2011 | |
dc.date.submitted | 2011-04-15 | |
dc.identifier.citation | References
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dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/48194 | - |
dc.description.abstract | 本篇論文的主旨在研發一種新的雙頻率雙極化外差干涉雷射都卜勒測速 (Laser Doppler velocimetry, LDV) 和動態雷射光散射(Dynamic light scattering, DLS)系統. 其特色主要藉由光束平移元件 (Beam displacer) 雙頻率偏極化雷射光束建構成雙軸雷射都卜勒測速系統和動態雷射光散射系統。兩系統之間的差異主要在於偵測散射光子信號強度的不同,前者屬於高強度散射光,而後者為弱散射光。本篇論文由理論的推導建立,至實驗中對精密旋轉馬達測速以及奈米粒子在溶液中的布朗運動和粒子大小的精密量測和分析,印證了本論文所提出方法的正確性。同時在本論文中亦對所提出方法和光學架構的特性以及優點,和傳統雷射都卜勒測速以及動態雷射光散射系統做詳細的比較和分析討論。本論文也對侷域的特性加以討論。 | zh_TW |
dc.description.abstract | In this thesis, a novel and sensitive dynamic light scattering system for both laser Doppler measurements and observing in-plane Brownian dynamics of nanoparticles has been developed. The system is based on the interference of the direct back scattered portions of two incident orthogonally polarized beams striking the sample, observing the spectrum of the interference signal and analyzing its corresponding spectrum width and spectral shift. An important feature of the system is that it utilizes a beam displacer to separate the incident laser beam into two orthogonal polarized components propagating in a parallel manner. The beam displacer also acts as a polarization gate for the scattering beams, ensuring the collection of scattering beams maintaining the same polarization state their corresponding incident beams. Verification of our method is done by determining the average size of polystyrene and gold nanoparticles undergoing Brownian motion in liquid suspension, and measuring the transverse velocity of fluid flow through a capillary tube. The average size of Brownian particles are determined by Lorentzian fittings of the measured power spectrums, while the fluid flow velocity is calculated from the amount of spectral shift between the original carrier frequency and the center frequency of the Doppler shifted spectrum. When used as a laser Doppler velocimeter, the proposed system achieves twice the sensitivity as conventional systems. In addition, the localization ability of this laser Doppler and dynamic light scattering system was also demonstrated. | en |
dc.description.provenance | Made available in DSpace on 2021-06-15T06:48:35Z (GMT). No. of bitstreams: 1 ntu-100-R94943160-1.pdf: 18710347 bytes, checksum: 9f5080840d7cd72e4e1fbe3b3fbe24cb (MD5) Previous issue date: 2011 | en |
dc.description.tableofcontents | 論文口試委員審定書……………………………………………………………… i
Acknowledgement ………………………………………………………………… ii Abstract (Chinese)……………………………………………………………… iii Abstract…………………………………………………………………………… iv List of Figures ………………………………………………………………… viii List of Tables…………………………………………………………………… xiv Chapter 1 Introduction……………………………………………………… 1 1.1 Research Motivation………………………………………………… 1 1.2 Research Objective ………………………………………………… 2 1.3 Research Background Information………………………………… 3 1.3.1 Laser Doppler Velocimetry………………………………………… 3 1.3.2 Dynamic Light Scattering ………………………………………… 5 1.4 Research Contributions and Thesis Outline…………………… 7 Chapter 2 Basic Principles and Theory Development ………………… 9 2.1 Heterodyne …………………………………………………………… 9 2.1.1 Optical Heterodyne Detection …………………………………… 9 2.1.2 Polarized Optical Heterodyne Detection ……………………… 10 2.2 Laser Doppler Velocimetry………………………………………… 12 2.2.1 Differential Doppler Heterodyne Technique Principle……… 12 2.2.2 Proposed Polarized Differential Doppler Heterodyne Theory Development……………………………………………………………………… 15 2.3 Dynamic Light Scattering ………………………………………… 17 2.3.1 Conventional Dynamic Light Scattering Principles ………… 18 2.3.2 Proposed Dual-beam Dynamic Light Scattering Theory Development……………………………………………………………………… 22 Chapter 3 Proposed Optical System Setup ……………………………… 27 3.1 Basic System Design………………………………………………… 27 3.2 Features and Detailed Functions of the Optical System…… 29 3.2.1 Beam Displacer – The Heart of the System…………………… 29 3.2.2 Two-Frequency Laser Source ……………………………………… 33 Chapter 4 Experimental Procedures and Results ……………………… 36 4.1 Laser Doppler Velocimetry Experiments………………………… 36 4.1.1 Tangential Velocity Determination of a Motorized Rotation Stage……………………………………………………………………………… 36 4.1.2 Doppler Sensitivity Comparison: Conventional vs. Proposed Setup……………………………………………………………………………… 49 4.1.3 Polystyrene Solution Flow Velocity Measurement …………… 55 4.2 Dynamic Light Scattering Experiments ………………………… 64 4.2.1 Lorentzian Broadening of Spectrum vs. Particle Concentrations ………………………………………………………………… 64 4.2.2 Lorentzian Broadening of Spectrum vs. Particle Sizes …… 66 4.3 Axial Resolution (Localization) Experiments………………… 77 4.3.1 Axial Resolution Determination Using a Mirror……………… 77 4.3.2 2-Dimensional Imaging of Polystyrene Particles on a Microscope Slide ……………………………………………………………… 83 Chapter 5 Discussions ……………………………………………………… 87 5.1 Beam Divergence Angle and Spectrum Broadening……………… 87 5.2 Localization ………………………………………………………… 90 5.3 Scattering Geometry………………………………………………… 91 5.4 Instrument Type for Dynamic Light Scattering System……… 93 5.5 System Design Modifications or Improvements………………… 95 Chapter 6 Conclusions and Future Works………………………………… 96 References ……………………………………………………………………… 99 | |
dc.language.iso | zh-TW | |
dc.title | 侷域性雙偏極化光外差干涉動態光散射量測系統之建立 | zh_TW |
dc.title | Localized Dual-Polarization Differential Heterodyne Dynamic Light Scattering System | en |
dc.type | Thesis | |
dc.date.schoolyear | 99-2 | |
dc.description.degree | 碩士 | |
dc.contributor.coadvisor | 曹恆偉(Hen-Wai Tsao) | |
dc.contributor.oralexamcommittee | 林浩雄(Hao-Hsiung Lin) | |
dc.subject.keyword | 雙極化光,外差干涉,動態光散射,雷射都卜勒,侷域,布朗運動, | zh_TW |
dc.subject.keyword | dual polarization,heterodyne,dynamic light scattering,laser Doppler,localization,Brownian motion, | en |
dc.relation.page | 102 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2011-04-18 | |
dc.contributor.author-college | 電機資訊學院 | zh_TW |
dc.contributor.author-dept | 電子工程學研究所 | zh_TW |
顯示於系所單位: | 電子工程學研究所 |
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