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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/83453

    Title: 基於鬼影成像之光聲顯微鏡;Photoacoustic Microscopy Using Ghost Image Reconstruction
    Authors: 胡嘉貫;KUN, WU KA
    Contributors: 光電科學與工程學系
    Keywords: 光聲效應;壓縮感知;影像辨識;光聲鬼影顯微成像系統;凸優化演算法;Photoacoustic effect;Compressive Sensing Theory;Image process;Ghost Imaging system;CS-GI-PAM;convex optimization program
    Date: 2020-07-29
    Issue Date: 2020-09-02 15:41:17 (UTC+8)
    Publisher: 國立中央大學
    Abstract: 中文摘要
    本實驗系統以1064 nm近紅外雷射光源,通過無聚焦系統放大光斑後投影在數位微鏡陣列上,以反射雷射光經過顯微鏡成像在物體表面上,接收產生的光聲訊號並透過壓縮感知理論的Dantzig selector演算法來還原物體的光聲影像。當中系統在Y方向上的點擴散函數半高全寬為3.35 um,X方向上半高全寬為2.78 um,成像系統可解析影像深度約3 um,還原範圍長約101.9 um和寬約64.39 um (共2880像素),在取樣圖案數除基底總數0.22 (660次),便能還原碳纖維的光聲影像,訊號區域平均訊號和非訊號區域平均訊號的比值在2.3以上,而其還原影像理想時間約38秒。
    This research is using the Compressive Sensing theory(CS theory) and Ghost Imaging system(GI system), combine with Photoacoustic microscopy system(PAM system) to build up as CS-GI-PAM system. Using the Carbon fiber as sample to reconstruct its Photoacoustic image to verify CS-GI-PAM system.
    In this study, the Pulse laser, which wavelength is 1064nm, through the afocal system to expend laser beam and project on digital micromirror device. Utilize DMD to reflect laser power distribution and image it on the sample surface, to generate photoacoustic signal and receive signal to resconstruct image. The system Y direction point spread function’s(PSF) full width at half maximum(FWHM) is 3.35 um, X direction PSF’s FWHM is 2.78 um, system imaging depth less than 3 um. The area of the image is 101.9 x 64.39 um(total pixel is 2880). The CS-GI-PAM system can use the fraction of total basis of sampling pattern ratio 0.23(660 pattern) to reconstruct the carbon fiber photoacoustic image and the signal part ratio can higher than 2.3, the rescontruct time costs about 38s.
    Appears in Collections:[光電科學研究所] 博碩士論文

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