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研究生:陳進福
研究生(外文):Jin-Fu Cheng
論文名稱:利用自發性布里淵散射量測不同光纖的超音波傳輸特性
論文名稱(外文):Using Spontaneous Brillouin Scattering to Measure Guided Ultrasonic Wave Propagation characteristics in Different Fibers
指導教授:祁 甡李 健 仲
指導教授(外文):Sien ChiChien-Chung Lee
學位類別:碩士
校院名稱:國立交通大學
系所名稱:光電工程所
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2002
畢業學年度:90
語文別:中文
論文頁數:67
中文關鍵詞:超音波布里淵散射壓電薄膜材料
外文關鍵詞:ultrasonic waveBrillouin scatteringpiezo-electricity thin film material
相關次數:
  • 被引用被引用:3
  • 點閱點閱:352
  • 評分評分:
  • 下載下載:71
  • 收藏至我的研究室書目清單書目收藏:0
在本篇論文當中,我們利用光纖的自發性布里淵散射效應,來量測超音波在不同光纖介質的傳輸行為,因為超音波和探測光波訊號同時在光纖中互相作用,所以可藉量測分佈式的布里淵頻譜的偏移量及能量準位而得到超音波的傳輸距離及衰減量。在我們的研究當中,BOTDR(Brillouin optical-time-domain reflectometer)可以量測分佈式的布里淵散射頻譜,所以藉由分析光纖的分佈式布里淵散射頻譜,可以得到不同的超音波的頻率及振幅在光纖中傳導之超音波傳輸特性。
對於超音波振盪器部分,其是利用射頻訊號來調變壓電薄膜材料(PZT)。而射頻產生器的頻率範圍約在1至2MHz,並透過圓錐形的預型體結構來將聲波能量耦合到不同光纖當中。
對於不同光纖的傳導超音波特性,我們分別對四種傳輸媒介作了研究,包含有單模光纖、色散位移單模光纖、大有效面積非零色散光纖、及真波光纖等光纖。並利用BOTDR量測技術,可以精確的量測及分析傳導超音波在四種光纖的傳輸特性。
In this thesis, we use the spontaneous Brillouin scattering effect in optical fibers to measure the propagation behavior of guided ultrasonic wave for different fibers. Due to the interaction between guided ultrasonic wave and the probe optical signal, the transmitted distance and attenuation of ultrasonic waves in optic-fibers can be observed by measuring the distributed Brillouin frequency-shift and power levels. Brillouin optical-time-domain reflectometer (BOTDR) is used to measure the distributed Brillouin-spectra in our study. By analyzing the distributed Brillouin-spectra along the optic-fibers, the transmission characteristics of guided ultrasonic waves in optic-fibers can be retrieved for different ultrasonic frequencies and amplitudes.
In the part of the ultrasonic oscillator, it uses the RF signal to modulate piezo-electricity thin film material (PZT). The RF signal frequency ranging from 1 to 2MHz is utilized as the RF source. The silica horn with cone structure is used to guide ultrasonic energy into optic-fibers.
To study the propagation behaviors of guided ultrasonic waves in different fibers, the optic-fibers including single mode fiber (SMF), dispersion shift fiber (DSF), large-effective area non-zero dispersion shift fiber (LEAF), and True-wave fiber (TWF) have been used as the transmission media. Using BOTDR measurement technology, the propagation characteristics of guided ultrasonic waves in these four fibers were measured and analyzed detailedly.
中文摘要………………………………………………………… i
英文摘要………………………………………………………… ii
誌謝………………………………………………………………iii
目錄……………………………………………………………… iv
表目錄…………………………………………………………… vi
圖目錄……………………………………………………………vii
第一章 緒 論………………………………………………… 1
1.1前言………………………………………………………… 1
1.2光纖感測技術的介紹……………………………………… 2
1.2.1分佈式光纖感測的介紹………………………………… 2
1.2.2超音波技術的介紹……………………………………… 4
1.3 論文架構…………………………………………………… 5
第二章 光纖的Brillouin散射效應…………………………… 6
2.1 Brillouin散射效應的簡介……………………………… 6
2.2Brillouin散射效應的理論分析…………………………… 9
2.2.1 激發性Brillouin散射效應…………………………… 9
2.2.2 自發性Brillouin散射效應…………………………… 11
2.3 BOTDR的原理及特性……………………………………… 12
2.3.1 BOTDR的動作原理……………………………………… 12
2.3.2各種光纖的Brillouin 頻譜量測……………………… 18
第三章 超音波在光纖介質的傳輸特性……………………… 21
3.1超音波在光纖介質的傳輸理論…………………………… 21
3.2 BOTDR量測超音波的原理………………………………… 30
第四章 利用自發性布里淵散射量測超音波現象…………… 32
4.1實驗元件的介紹…………………………………………… 32
4.1.1Silica Horn(SH)的設計………………………………… 32
4.1.2壓電薄膜材料的簡介…………………………………… 33
4.2實驗架構…………………………………………………… 35
4.3實驗結果…………………………………………………… 38
4.3.1 SMF(Single Mode Fiber)…………………………… 38
4.3.2 LEAF(Large Effective Area Fiber)………………… 45
4.3.3 DSF(Dispersion Shift Fiber)……………………… 50
4.3.4 TW-RSF(True Wave-Reduced Slope Fiber)………… 55
4.4結果討論…………………………………………………… 57
第五章 結論與未來展望……………………………………… 58
參考文獻………………………………………………………… 60
附錄……………………………………………………………… 63
參 考 文 獻
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