臺灣博碩士論文加值系統

本研究提出一種基於QHQ相移技術的全域式光學同調斷層掃描儀，其特點為成像品質較不受相移誤差所影響。此系統由偏振式Linnik干涉儀、QHQ消色差相移器及CCD所組成。利用消色差相移器在參考臂及樣本臂之間引入相位差，並記錄相移量為0°、90°、180°及270°的四張干涉影像，最後以四步相移法還原出精確的待測物二維截面影像。本研究除了進行了系統特性驗證，並以此干涉儀實際對黏貼膠帶的硬幣、洋蔥及幼蝦…等樣本進行斷層掃描，並且獲得滿意的結果。

This study provides a full-field optical coherence tomography (OCT) by using a QHQ phase shifter. The image quality of the proposed OCT is less affected by the phase shift error. The OCT system is composed of a superluminescent diode, polarization Linnik interferometer, QHQ phase shifter, and CCD. Four interferometric images corresponding to phase shifts of 0°, 90°, 180° and 270° are recorded. The phase shift is introduced between the measurement and reference beams by rotating the half-wave plate in the OHQ phase shifter. A two-dimensional cross-sectional image of a sample to be tested is then retrieved from the four images by using the four-step algorithm. The capability of the presented OCT is verified by imaging a coin covered with transparent and diffusion films, an onion, and a baby shrimp.

摘要 I
目錄 II
圖目錄 V
表目錄 VIII
第一章 緒論 1
1.1 研究動機 1
1.2 研究背景及文獻探討 2
1.3 研究方法 5
第二章 光學同調斷層掃描術及相移技術 6
2.1 低同調干涉原理 6
2.2 相移技術 9
2.2.1 HQ相移技術 9
2.2.2 QP相移技術 11
2.2.3 HQP相移技術 12
2.2.4 QHQ相移技術 13
2.3 相移干涉術計算法 16
2.3.1 三步計算法 16
2.3.2 四步計算法 17
2.3.3 Carre計算法 18
2.3.4 Hariharan計算法 19
第三章 全域式光學同調干涉儀架構 21
3.1 全域式光學同調干涉儀系統 22
3.2 系統架構模擬 24
3.2.1 照明光路 24
3.2.2 成像光路 25
3.3 四步相移法解調 27
3.4 系統解析度及視場 29
3.4.1 縱向解析度 29
3.4.2 橫向解析度 32
3.4.3 視場大小 33
3.5 同調面與焦平面的分離關係 34
第四章 實驗結果與討論 37
4.1 硬幣 37
4.1.1 十元硬幣 37
4.1.2 黏貼雙層膠帶的十元硬幣 39
4.1.3 塗抹顏料及黏貼一層透明膠帶的十元硬幣 42
4.2 洋蔥 44
4.3 幼蝦 49
第五章 結論與未來展望 51
參考文獻 52

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