光聲壓縮感知顯微影像系統改善與以加熱樣品提升光聲訊號強度之研究

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姓名

王奕辰(Yi-Chen Wang) 查詢紙本館藏

畢業系所

光電科學與工程學系

論文名稱

光聲壓縮感知顯微影像系統改善與以加熱樣品提升光聲訊號強度之研究

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摘要(中)

本文闡述如何以光聲量測系統為基礎建立由微型鏡片陣列裝置(DMD)作為架構主要核心的光聲壓縮感知鬼影成像系統，並針對DMD微鏡片結構造成的能量丟失導致的光聲量測低訊雜比問題提出解決方案。首先藉由光聲效應與溫度的關聯設計實驗，並透過分析實驗結果配合熱傳方程式與光致聲波方程式的學理證實熱致光聲增強現象可以應用於提升光聲訊號訊雜比。隨後透過調整系統相關軟硬體，有效改良並簡化光聲壓縮感知鬼影成像系統的還原流程，最後證實雷射作為非接觸式熱源與光聲壓縮感知鬼影成像系統結合可以成功重建光聲影像。

摘要(英)

A photoacoustic compressive sensing ghost imaging system based on the photoacoustic measurement system with a digital micro-mirror array device (DMD) is proposed and realized. To overcome the bottleneck in low signal-to-noise ratio, the solution based on the thermo-induced photoacoustic enhancement effect has been introduced. By adjusting the relevant software and hardware of the system, the restoration process of the photoacoustic compressed sensing ghost imaging system was effectively improved and simplified. Finally, it was confirmed that the combination of the laser as a non-invasive heat source and the photoacoustic compressed sensing ghost imaging system can successfully reconstruct the photoacoustic image.

關鍵字(中)

★ 光聲效應
★ 顯微影像系統
★ 壓縮感知
★ 訊雜比
★ 鬼影成像

關鍵字(英)

★ photoacoustic effect
★ microscopy
★ compressive sensing
★ SNR
★ Ghost imaging

論文目次

目錄
中文摘要 VII
Abstract VIII
致謝 IX
目錄 X
圖目錄 XII
第一章緒論 1
1.1 前言 1
1.2 研究動機 3
1.3 論文架構 3
第二章背景知識 4
2.1 光聲效應原理與機制 4
2.1.1光致聲波產生之原理與流程 4
2.1.2光聲效應與溫度之關係 6
2.2光致聲波動方程式 7
2.2.1光致聲波動方程式 7
2.2.2 求解光致聲波動方程式 8
2.3 計算鬼影成像與單像素成像系統 9
2.3.1鬼影成像系統 9
2.3.2單像素成像系統 10
2.4 壓縮感知(Compressive sensing) 12
2.4.1 壓縮感知單像素成像系統 12
2.4.2 壓縮感知影像還原演算法 13
2.5 光聲顯微影像系統 15
2.5.1 光聲顯微影還原方法與重建速度 15
2.5.2光聲壓縮感知鬼影顯微成像系統 16
2.6訊號擷取與紀錄 17
第三章前導實驗 19
3.1 光聲激發與量測實驗 19
3.1.1 光聲激發與量測系統 19
3.1.2 實驗樣品 21
3.1.3 儀控與訊號擷取 23
3.1.4 光聲激發與量測系統之架設方法與與實驗步驟 24
3.2外部熱源調制光聲訊號實驗 27
3.2.1 外部熱源雷射調制模組與光聲量測系統 27
3.2.2 儀控與訊號擷取 29
第四章光聲壓縮感知鬼影成像實驗 30
4.1 光聲壓縮感知鬼影成像系統 30
4.1.1光聲壓縮感知鬼影成像系統 30
4.1.2基底播放時脈驗證子系統 32
4.1.3 光聲壓縮感知鬼影成像系統架設方法與細節 33
4.2儀控與訊號擷取 35
4.3訊號處理與影像還原流程 37
第五章實驗結果與討論 39
5.1 儀器參數設定與系統架設對光聲訊號量測之影響 39
5.1.1 脈衝雷射參數設定對光聲訊號之影響 39
5.1.2光聲激發與量測系統架設對光聲訊號之影響 50
5.1.3 外部熱源雷射光路架設對光聲訊號之影響 53
5.2 壓縮感知鬼影成像系統之光聲影像還原結果 56
5.2.1 以壓縮感知鬼影成像系統重建之光聲影像結果 56
5.2.2光聲壓縮感知鬼影成像系統還原時間與系統改善細節 59
第六章總結與未來展望 61
參考文獻 62
附錄 65
附錄一惠斯登電橋與溫度驗證實驗 65
A.1.1電阻率與電阻溫度係數之定義 65
A.1.2 惠斯登電橋 65
A.1.3 惠斯登電橋與碳纖維樣品製備 66
A.1.4 惠斯登電橋與溫度驗證實驗 67
附錄二環境溫度對光聲訊號量測影響 68

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指導教授

鍾德元(Te-Yuan Chung)

審核日期

2022-12-14

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