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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 曾雪峰 | |
| dc.contributor.author | Shi-Xuan Yang | en |
| dc.contributor.author | 楊士玄 | zh_TW |
| dc.date.accessioned | 2021-06-17T04:31:13Z | - |
| dc.date.available | 2019-08-13 | |
| dc.date.copyright | 2018-08-13 | |
| dc.date.issued | 2018 | |
| dc.date.submitted | 2018-08-13 | |
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/70565 | - |
| dc.description.abstract | 為了模擬光經過隨機分布的介質中散射的擴散情形，本研究建造了隨機分布的介質模型並且利用時域擬譜法(Pseudospectral time-domain technique, PSTD)來模擬分析他們的光學特性，其中，擬譜時域分析法是源自於馬克斯威方程式(Maxwell’s equation)的數值解，利用此方法可以應用在模擬大範圍空間中的電磁波問題。本論文中，分析各種因素，包含入射光的波長、介質數量與分佈，將模擬結果量化分析，模擬結果中可以明顯地看出光經過隨機介質有擴散的情形，其中分別討論在固定頻率下，不同散射介質數目對光擴散程度的影響，以及在固定散射介質數目下，不同光源頻率對光擴散程度的影響。本研究中利用二維時域擬譜法模擬光在散射介質中的傳播，在本論文中採用的散射介質以圓柱狀的散射介質並且以隨機分布的形式作排列，模擬光在隨機散射介質中的傳播，並且計算散射後的Radar Cross-Section (RCS)再加以分析，研究光經過隨機分布的散射介質後光束擴散的情形，而實驗結果也表明光會受到哪些因素而有光束寬度上的影響。 | zh_TW |
| dc.description.abstract | Here we model a light propagating through a scattering medium. We employ the pseudospectral time-domain (PSTD) simulation technique to model light propagation through the scattering media. To analyze the scattering characteristics of light, various factors are analyzed, including the wavelength of incident light, the number of the scattering medium, position of the scattering medium and size distribution of the scattering medium. Simulation results show that the direction of propagation is affected by the scattering medium. Specifically, different angular span of out-coming light are affected by randomly-positioned scattering medium. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-17T04:31:13Z (GMT). No. of bitstreams: 1 ntu-107-R05941097-1.pdf: 2298645 bytes, checksum: d5a64be947edef4ae8286a260c4b506c (MD5) Previous issue date: 2018 | en |
| dc.description.tableofcontents | 誌謝....................................................................................................................................i
中文摘要...........................................................................................................................ii ABSTRACT.....................................................................................................................iii 目錄..................................................................................................................................iv 圖附錄..............................................................................................................................vi 第一章 時域擬譜法(Pseudospectral time-domain technique, PSTD)..............................1 1.1 時域擬譜法(Pseudospectral time-domain technique, PSTD) ............................1 1.2 奈奎斯特頻率(Nyquist frequency) ....................................................................6 1.3 收邊界條件：單軸完美匹配層 (Uniaxial Perfectly Matched Layer Absorption Boundary Condition, UPML ABC) ................................................7 第二章 Radar Cross-Section (RCS)理論.......................................................................11 2.1 格林定理(Green’s Theorem)的應用...............................................................11 2.2 近場與遠場變換(Near-to-Far-Field Transformation, NTFF) .......................13 2.3 Radar Cross-Section (RCS)的推導.................................................................16 第三章 介質隨機排列的構造與參數...........................................................................18 3.1 模擬空間與隨機排列介質.............................................................................18 3.2 光源的設置與時間步數.................................................................................20 第四章 數值模擬結果與分析........................................................................................22 4.1 光在隨機介質中的擴散性質..........................................................................22 4.2 數據量化..........................................................................................................25 4.2.1 平均數據結果.........................................................................................25 4.2.2 以高斯濾波(Gaussian Filtering)的方式處理離散數據.........................27 4.2.3以半峰全寬(Full width at half maximum, FWHM)定義波束寬度.......28 4.3 散射介質數目對擴散性質的影響.................................................................29 4.4 入射光源對擴散性質的影響.........................................................................33 第五章 總結與未來工作................................................................................................40 5.1 總結..................................................................................................................40 5.2 未來工作..........................................................................................................41 參考文獻.........................................................................................................................42 | |
| dc.language.iso | zh-TW | |
| dc.subject | 時域擬譜分析法 | zh_TW |
| dc.subject | 光束寬度擴散 | zh_TW |
| dc.subject | 隨機散射介質 | zh_TW |
| dc.subject | Beamwidth Expansion | en |
| dc.subject | randomly-positioned scattering medium | en |
| dc.subject | pseudospectral time-domain (PSTD) | en |
| dc.title | 以時域擬光譜法模擬光在隨機介質中擴散的性質 | zh_TW |
| dc.title | PSTD Simulation of Light Beam Expansion with the Presence of a Scattering Medium | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 106-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 張世慧,黃定洧 | |
| dc.subject.keyword | 時域擬譜分析法,隨機散射介質,光束寬度擴散, | zh_TW |
| dc.subject.keyword | pseudospectral time-domain (PSTD),randomly-positioned scattering medium,Beamwidth Expansion, | en |
| dc.relation.page | 43 | |
| dc.identifier.doi | 10.6342/NTU201802726 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2018-08-13 | |
| dc.contributor.author-college | 電機資訊學院 | zh_TW |
| dc.contributor.author-dept | 光電工程學研究所 | zh_TW |
| 顯示於系所單位： | 光電工程學研究所 | |
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