臺灣博碩士論文加值系統

本研究提出適用於全域式光學同調斷層掃描術的水平配向液晶相移器，此相移器由兩片四分之一波片之間夾著三片水平配向液晶半波片所組成。比起旋轉波片或偏振片的傳統消色散相移器，此液晶相移器能快速產生相移，並且沒有機械擾動。使用三種不同的液晶盒制動模式，在參考臂及樣本臂之間產生-120°、0°和120°的相移，並紀錄三張相移干涉圖像，最後以三步計算法還原出待測物的二維截面影像。本研究以硬幣、硬幣黏貼多層膠帶及洋蔥為樣本，實驗結果證明此系統的可行性。

This research presents a planar liquid-crystal (PLC) phase shifter for full-field optical coherence tomography (FF-OCT). The proposed device consists of three PLC half-wave plates sandwiched between two quarter-wave plates. Compared with traditional achromatic phase shifters with a rotating wave plate or polarizer, the PLC device can quickly generate phase shifts without mechanical vibrations. Three different drive methods are applied to the PLC cells, and three different phase shifts, -120°, 0°, and 120°, are introduced between the measurement and reference beams in the FF-OCT system. A tomographic image is retrieved from three phase-shifted interferograms by using three-step algorithm. The feasibility of the proposed technology is demonstrated by imaging a coin, a coin covered alternately with transparent and diffusion films, and an onion.

摘要 ............................................................................................................. I
ABSTRACT .............................................................................................. III
目錄 .......................................................................................................... IV
圖目錄 ...................................................................................................... VI
表目錄 ...................................................................................................... IX
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...................................................................................... 8
第二章 低同調干涉術及相移技術 .......................................................... 9
2.1 低同調干涉術 ............................................................................. 9
2.2 相移技術.................................................................................... 14
2.2.1 HQ相移技術 ................................................................... 15
2.2.2 QP相移技術 ................................................................... 16
2.2.3 HQP相移技術 ................................................................ 17
2.2.4 QHQ相移技術 ................................................................ 18
2.3 相移干涉術計算法 ................................................................... 21
2.3.1 三步計算法 .................................................................... 21
2.3.2 四步計算法 .................................................................... 22
2.3.3 Carre計算法.................................................................... 23
2.3.4 Hariharan計算法 ............................................................ 24
第三章 水平配向液晶相移器 ................................................................ 26
3.1 液晶相移器原理 ....................................................................... 26
3.2 液晶半波片設計 ....................................................................... 29
3.2 液晶半波片光學特性檢測 ....................................................... 33
3.2.1 相位延遲角值 ................................................................ 33
3.2.2 反應時間 ........................................................................ 37
第四章 全域式光學同調斷層掃描儀 .................................................... 39
4.1 系統架構.................................................................................... 39
4.2 量測流程.................................................................................... 42
4.3 三步計算法驗證 ....................................................................... 43
4.4 空間解析度及視場大小 ........................................................... 45
4.5 一元硬幣量測 ........................................................................... 48
4.6 硬幣黏貼多層膠帶的量測 ....................................................... 50
4.7 洋蔥量測.................................................................................... 52
第五章 結論與未來展望 ........................................................................ 54
參考文獻 ................................................................................................... 55

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