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http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/47876完整後設資料紀錄
| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 陳兆勛 | |
| dc.contributor.author | Chin-Hung Hsu | en |
| dc.contributor.author | 徐進鴻 | zh_TW |
| dc.date.accessioned | 2021-06-15T06:23:57Z | - |
| dc.date.available | 2012-08-11 | |
| dc.date.copyright | 2010-08-11 | |
| dc.date.issued | 2010 | |
| dc.date.submitted | 2010-08-09 | |
| dc.identifier.citation | [1]沈育霖，光纖分佈式感測技術於結構安全監測之多功應用研究，國立台灣大學應用力學研究所，博士論文，2010
[2]張國鎮，光纖感測監測之應用發展，國家地震工程研究中心，2001 [3] W.W.M. G. Meltz, and W. H. Glenn, 〝Formation of Bragg gratings in optical fibers by a transverse holographic method,〞 Opt. Lett., vol.14, p. 823, 1989. [4]李哲賢，BOTDR、BOCDA應用於土木工程的監測與感測，國家地震工程研究中心，2001 [5]H. Naruse and M. Tateda, 〝Trade-off between the spatial and the frequency resolutions in measuring the power spectrum of the Brillouin backscattered light in an optical fiber.〞 Applied Optics, 38(31): p. 6516-6521,1999. [6]K. Hotate and T. Hasegawa, 〝Measurement of Brillouin Gain Spectrum Distribution Along an Optical Fiber Using a Correlation-based Technique-Proposal, Experiment and Simulation,〞 IEICE trans.Electron., 83(3): p. 405-412, 2000. [7]蔣博文，利用自發性布里淵散射技術之分佈型應變與溫度感測，國立交通大學，光電工程研究所，2001 [8]F.T.Arecchi and E.O.Schulz-Dubois, eds. ,〝Laser Handbook〞, vol2, pp.1077-1150, North-Holland, 1972. [9]T. Horiguchi, K. Shimizu, T. Kurashima, M. Tateda, and Y. Koyamada, 〝Development of a distributed sensing technique using Brillouin scattering,〞 J. Lightwave Technol., vol.13, pp.1296–1302, 1995. [10]http://park.itc.u-tokyo.ac.jp/hotalab/english/research/bocda-r.html [11]http://metwww.epfl.ch/Brillouin/CaptTempE.htm ; METLab, ”Temperature and strain sensor,” [12]張鈞博，分佈式布里淵光纖感測器於自動定位與結果判讀之研究，國立台灣大學應用力學研究所，碩士論文， 2009 [13]M.O. van Deventer and A.J. Boot,〝Polarization properties of stimulated Brillouin scattering in single-mode fibers,〞J. Lightwave Technol., vol.12, no.4, pp.585–590, 1994. [14]T. Horiguchi and M. Tateda,〝Optical-fiber-attenuation investigation using stimulated Brillouin scattering between a pulse and a continuous wave,〞Opt. Lett., vol. 14, pp. 408–410, 1989. [15]K. Hotate and K. Abe,〝BOCDA fiber optic distributed strain sensing system with a polarization diversity scheme for enlargement of measurement range,〞in 17th Int. Conf. Optical Fiber Sensors (OFS-17), Bruges, Belgium, Paper P1-76, 2005. [16] T. Horiguchi and M. Tateda, Optics Letters, 14, 8, pp.408-410, 1989. [17] ftp://ftp.ni.com/pub/devzone/pdf/tut_4811.pdf [18]張智奇，分散式布里淵散射量測系統之建置，國立台灣大學應用力學研究所，博士論文，2007 [19]M. Kannou, S. Adachi, and K. Hotate,〝Temporal gating scheme for enlargement of measurement range of Brillouin optical correlation domain analysis for optical fiber distributed strain measurement,〞in 16th Int. Conf. Optical Fiber Sensors (OFS-16), Nara, Japan, Paper We3-1,2003. | |
| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/47876 | - |
| dc.description.abstract | 大型結構物的維護與監測需仰賴各式感測器，將感測器鋪設在結構物上監控該處狀況。但結構物未來損害的位置不容易預測，而傳統式感測器只能做點狀式量測，無法反映結構物整體的狀況。本實驗室之光纖感測系統即是以光纖分佈式感測來作為結構物之神經系統。以此來偵測結構物之裂化並避免災害發生。
本研究室已建置出一套分佈式布里淵光纖感測系統(BOCDA)，其藉由控制泵光波(pump)與探測光波(probe)之間的相關性(correlation)來達到分佈式應變量測。在本文則是提出一極化差異法(polarization diversity)來減少因泵光波與探測光波極化態的改變所造成的量測誤差，先以一極化控制器將泵光波與探測光波之極化態調整成一致獲得最佳的布里淵增益，再利用一極化切換器以探測光波的正交極化態來補償極化態未調成一致的區段，降低量測誤差。並以PXI(PCI eXtensions for Instrumentation)平台來重新架構系統，以模組式介面卡取代傳統箱型儀器來縮小系統體積、提升傳輸效率及降低成本，使系統應用性更廣。 | zh_TW |
| dc.description.abstract | At present, the maintenance and monitoring of the large-scale structure are dependent on all kinds of sensors, we monitor the conditions of the locations where sensors are laid. However, due to the characteristics of conventional sensors, structural response can only be measured at specific locations. Since it’s very difficult to predict the future damage locations of the structure, the monitoring systems usually fail to reflect the conditions of the structures. Therefore, our lab’s fiber sensor system use the property of distributed sensing for establishing the nervous system of structures, in order to detect structure cracks and avoid accidents.
Our lab have developed Brillouin Optical Correlation Domain Analysis (BOCDA) for distributed strain measurement. BOCDA can achieve distributed strain measurement by controlling a correlation between pump and probe lightwave. In this study, we propose a scheme for polarization diversity to reduce data fluctuation by polarization state change of pump and probe lightwave. First, we used a polarization controller(PC) and adjusted relative polarization state between the pump and probe lightwave to acquire the optimum Brillouin gain. Second, we introduced a polarization switch(PSW) that can generate vertical and horizontal linear polarization state and compensated for the sections that the relative polarization state are not optimum to decrease the measurement errors. And, we use a PXI(PCI eXtensions for Instrumentation) platform to reconstruct our system : replace conventional instruments by PXI modules for lightweight, upgrade transmission rate, cut down the installation cost and apply widely. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-15T06:23:57Z (GMT). No. of bitstreams: 1 ntu-99-R97543066-1.pdf: 2014490 bytes, checksum: 4e3dd4beb15168abf1a76eda86c91ea2 (MD5) Previous issue date: 2010 | en |
| dc.description.tableofcontents | 目錄
摘要................................................................................................................................ i Abstract .......................................................................................................................... ii 目錄.............................................................................................................................. iii 圖表目錄........................................................................................................................ v 第一章 緒論.................................................................................................................. 1 1-1 動機與目的 .................................................................................................... 1 1-2 文獻回顧 ........................................................................................................ 1 1-2.1 光纖感測技術 ..................................................................................... 1 1-2.2 光纖感測監測應用 ............................................................................. 3 1-2.3 分佈式光纖感測 ................................................................................. 4 1-2.3.1 BOTDR(Brillouin Optical Time Domain Refectometer) .......... 5 1-2.3.2 BOCDA(Brillouin Optical Correlation Domain Analysis) ....... 6 1-3 內容大綱 ........................................................................................................ 6 第二章 分佈式光纖感測之原理.................................................................................. 9 2-1 光纖的散射 .................................................................................................... 9 2-2 光纖之布里淵效應 ........................................................................................ 9 2-3 BOCDA ......................................................................................................... 10 2-3.1 BOCDA架構及原理 ......................................................................... 10 2-3.2 空間解析度 ....................................................................................... 11 2-3.3 定位原理 ........................................................................................... 12 2-3.4 BOCDA元件 ..................................................................................... 13 2-3.4.1 被動元件 ................................................................................ 13 2-3.4.2 DFB雷射二極體(Distributed Feedback Laser Diode) ........... 13 2-3.4.3 電光調變器(Electro-Optical Modulators) ............................. 14 2-3.4.4 摻鉺光纖放大器(EDFA) ....................................................... 14 2-3.4.5 衰減器(attenuator).................................................................. 14 2-3.4.6 Fabry-Perot可調式濾波器 ..................................................... 15 2-3.4.7 鎖相放大器(Lock-In Amplifier) ............................................ 15 2-3.5 BOCDA量測流程 ............................................................................. 15 第三章 系統增強與實驗結果.................................................................................... 25 3-1極化差異法(polarization diversity scheme) ................................................. 25 3-1.1極化最佳化 ........................................................................................ 25 3-1.2 極化切換 ........................................................................................... 26 3-2 PXI平台整合 ................................................................................................ 28 第四章 結論與未來展望............................................................................................ 45 4-1 結論 .............................................................................................................. 45 4-2 未來展望 ...................................................................................................... 45 參考文獻...................................................................................................................... 47 圖表目錄 圖1.1 光纖感測器(a)分佈式(b)多點式[3] .................................................................. 7 圖1.2 光纖感測器應用於結構物監測[3] ................................................................... 7 圖1.3 BOTDR示意圖[4] ............................................................................................. 8 圖1.4 光脈波寬度與布里淵頻寬之關係[5] ............................................................... 8 圖2.1 光纖內各種散射的頻譜圖[11] ....................................................................... 17 圖2.2 光纖內的布里淵散射示意圖[7] ..................................................................... 17 圖2.3 BOCDA系統架構圖........................................................................................ 18 圖2.4 單模光纖之布里淵頻譜.................................................................................. 18 圖2.5 布里淵頻率與應變、溫度之關係[10] ........................................................... 19 圖2.6 藉由光源調變在特定位置產生激發性布里淵增益示意圖(一)[6] .............. 19 圖2.7 藉由光源調變在特定位置產生激發性布里淵增益示意圖(二)[4] .............. 20 圖2.8 空間解析度示意圖[6] ..................................................................................... 20 圖2.9 correlation peaks示意圖[1] ............................................................................. 21 圖2.10 correlation peaks與光纖測詴區示意圖 ........................................................ 21 圖2.11 利用相鄰兩peaks求得實際位置[12] .......................................................... 22 圖2.12 光隔離器........................................................................................................ 22 圖2.13 光循環器示意圖............................................................................................ 23 圖2.14 EDFA示意圖 ................................................................................................. 23 圖2.15 HP 8157A光衰減器....................................................................................... 23 圖2.16 BOCDA量測流程圖...................................................................................... 24 圖3.1 Agilent 11896A ................................................................................................. 31 圖3.2 Agilent 11896A 方塊圖 ................................................................................... 31 圖3.3 測詴光纖 (1) ................................................................................................... 31 圖3.4 DSF之布里淵頻譜 .......................................................................................... 32 圖3.5 極化控制器之最佳化調整.............................................................................. 32 圖3.6 未做極化最佳化(訊雜比較低) ....................................................................... 33 圖3.7 極化最佳化後(訊雜比較高) ........................................................................... 33 圖3.8 極化最佳化前之分佈式量測.......................................................................... 34 圖3.9 極化最佳化後之分佈式量測.......................................................................... 34 圖3.10 BOCDA原理(上)和該處BGS(下)--(a)極化態一致(b)極化態不一致 ........ 35 圖3.11 極化切換示意圖—probe極化態從ideal state(a)改變至another state(b)，再由orthogonal state(c)做補償[15] ........................................................................ 35 圖3.12 PSW工作示意圖 ........................................................................................... 36 圖3.13 加入PSW之量測時序示意圖 ..................................................................... 36 圖3.14 測詴光纖(2)、(3) .......................................................................................... 37 圖3.15 測詴光纖(2)量測結果—未加入極化差異法 ............................................... 37 圖3.16測詴光纖(2)量測結果—加入極化差異法 .................................................... 38 圖3.17 測詴光纖(2)於極化態一致處之布里淵特徵頻譜 ....................................... 38 圖3.18 測詴光纖(2)於極化態一致處之布里淵增益頻譜 ....................................... 39 圖3.19 測詴光纖(2)於極化態不一致處之布里淵特徵頻譜 ................................... 39 圖3.20 測詴光纖(2)於極化態不一致處之布里淵增益頻譜 ................................... 40 圖3.21測詴光纖(3)量測結果—未加入極化差異法 ................................................ 40 圖3.22測詴光纖(3)量測結果—加入極化差異法 .................................................... 41 圖3.23 標準的8槽式PXI機箱，包含1組嵌入式控制器與7個週邊模組[17] 41 圖3.24 PXI時脈與觸發匯流排[17] .......................................................................... 42 圖3.25 本系統所使用之控制器及模組.................................................................... 42 圖3.26 PXI平台前後對照圖 ..................................................................................... 43 圖3.27 Labview人機介面.......................................................................................... 44 表3.1 設備成本比較表.............................................................................................. 43 | |
| dc.language.iso | zh-TW | |
| dc.title | 以極化差異法與PXI平台改善分佈式布里淵光纖感測系統 | zh_TW |
| dc.title | Enhancement of Distributed Fiber Brillouin Scattering Measurement System via Polarization Diversity Scheme and PXI Platform | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 98-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 蔡明義,鄭江河 | |
| dc.subject.keyword | 分佈式感測,極化差異法,PXI,光纖感測, | zh_TW |
| dc.subject.keyword | distributed sensing,polarization diversity,PXI,fiber sensor, | en |
| dc.relation.page | 48 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2010-08-09 | |
| dc.contributor.author-college | 工學院 | zh_TW |
| dc.contributor.author-dept | 應用力學研究所 | zh_TW |
| 顯示於系所單位： | 應用力學研究所 | |
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