基于朗奇光柵的結(jié)構(gòu)光照明成像技術(shù)
發(fā)布時間：2019-02-23 19:52
【摘要】：相位分布在光學(xué)系統(tǒng)中對于測量物體表面形狀或者厚度以及細節(jié)信息具有重要作用,所以對于相位的恢復(fù)計算一直是物理學(xué)領(lǐng)域的熱點問題。相位恢復(fù)的實質(zhì)是通過容易測量的強度信息重建目標(biāo)光場的復(fù)振幅函數(shù),既可由全息的方式也能通過迭代衍射計算的方式得以實現(xiàn)。特別是迭代型相位恢復(fù)算法,由于其具有成像光路及裝置簡單的特點,受到了越來越多的關(guān)注。近幾年的相位恢復(fù)算法都是在掃描方式以及算法約束改進等方面有所創(chuàng)新,對于改變相位恢復(fù)成像系統(tǒng)照明方式的研究還鮮有文獻。本文的主要研究內(nèi)容就是將結(jié)構(gòu)光照明的方式引入到相位恢復(fù)系統(tǒng)中,提出一種基于朗奇光柵的結(jié)構(gòu)光照明成像系統(tǒng)�，F(xiàn)將主要研究內(nèi)容總結(jié)如下:首先設(shè)計成像系統(tǒng)光路,分析成像系統(tǒng)的成像過程及原理,確定系統(tǒng)內(nèi)元件的位置和各項參數(shù)。并且探究朗奇光柵的性質(zhì),分析比較它和正弦光柵的異同,對其對于照明光的調(diào)制作用進行深入解析及實踐。并對于所提出的基于朗奇光柵的結(jié)構(gòu)光照明成像系統(tǒng)進行仿真實驗,探究其恢復(fù)圖像的精度和速度,并與近年來提出的一種同軸全息算法做比較,對于本文所提出的算法作更好的比較驗證。其次分析各項因素對成像系統(tǒng)的影響,在本文中討論的影響因素包括波長大小、傾斜衍射、光柵性質(zhì)以及軸向衍射距離。其中光柵性質(zhì)中又包括光柵調(diào)制、光柵位置和光柵周期影響。對這些影響因素設(shè)置不同的參數(shù)進行仿真計算,探究它們對于成像結(jié)果的作用,并從分析結(jié)果入手,選擇系統(tǒng)各項參數(shù)的最優(yōu)范圍,以減少人為設(shè)置參數(shù)的影響,獲得更優(yōu)的成像效果。最后搭建實驗系統(tǒng),對本文所提出的成像系統(tǒng)進行實驗驗證。并且經(jīng)過分析討論后在實驗設(shè)備及環(huán)境允許的條件下,在實驗中選擇合適的參數(shù)。對于實驗過程中出現(xiàn)的傾斜衍射現(xiàn)象進行校正,以獲得較優(yōu)的實驗結(jié)果。用實驗中采集的衍射圖案進行算法驗證,并對于實驗以及成像結(jié)果進行分析。
[Abstract]:Phase distribution plays an important role in measuring the surface shape, thickness and details of the object in optical systems, so the calculation of phase recovery is always a hot issue in the field of physics. The essence of phase recovery is to reconstruct the complex amplitude function of the target light field through easily measured intensity information, which can be realized by both holographic and iterative diffraction calculations. Especially the iterative phase recovery algorithm has attracted more and more attention because of its simple imaging optical path and device. In recent years, phase restoration algorithms have been innovated in scanning mode and algorithm constraint improvement, but there are few literatures on how to change the illumination mode of phase recovery imaging system. The main research content of this paper is to introduce the method of structured light illumination into the phase recovery system, and propose a structured light illumination imaging system based on Range grating. The main research contents are summarized as follows: firstly, the optical path of the imaging system is designed, the imaging process and principle of the imaging system are analyzed, and the position and parameters of the components in the system are determined. The properties of the Range grating are discussed, the similarities and differences between it and the sinusoidal grating are analyzed and compared, and the modulation effect of the Range grating on the illumination light is deeply analyzed and practiced. The simulation experiments of the proposed structured light illumination imaging system based on Range grating are carried out to explore the accuracy and speed of image restoration, and a comparison is made with a coaxial holographic algorithm proposed in recent years. The algorithm proposed in this paper is compared and verified better. Secondly, the influence of various factors on the imaging system is analyzed. The influencing factors discussed in this paper include wavelength size, tilt diffraction, grating properties and axial diffraction distance. The grating properties include grating modulation, grating position and grating period. The different parameters of these factors are simulated and calculated, and the effect of these parameters on the imaging results is explored, and the optimal range of the system parameters is selected from the analysis results to reduce the effect of artificial setting parameters. Better imaging effect is obtained. Finally, an experimental system is built to verify the imaging system proposed in this paper. After analysis and discussion, the appropriate parameters are selected under the conditions of experimental equipment and environment. In order to obtain better experimental results, the oblique diffraction phenomenon occurred during the experiment was corrected. The diffraction pattern collected in the experiment is used to verify the algorithm, and the experimental and imaging results are analyzed.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TP391.41
本文編號：2429142
[Abstract]:Phase distribution plays an important role in measuring the surface shape, thickness and details of the object in optical systems, so the calculation of phase recovery is always a hot issue in the field of physics. The essence of phase recovery is to reconstruct the complex amplitude function of the target light field through easily measured intensity information, which can be realized by both holographic and iterative diffraction calculations. Especially the iterative phase recovery algorithm has attracted more and more attention because of its simple imaging optical path and device. In recent years, phase restoration algorithms have been innovated in scanning mode and algorithm constraint improvement, but there are few literatures on how to change the illumination mode of phase recovery imaging system. The main research content of this paper is to introduce the method of structured light illumination into the phase recovery system, and propose a structured light illumination imaging system based on Range grating. The main research contents are summarized as follows: firstly, the optical path of the imaging system is designed, the imaging process and principle of the imaging system are analyzed, and the position and parameters of the components in the system are determined. The properties of the Range grating are discussed, the similarities and differences between it and the sinusoidal grating are analyzed and compared, and the modulation effect of the Range grating on the illumination light is deeply analyzed and practiced. The simulation experiments of the proposed structured light illumination imaging system based on Range grating are carried out to explore the accuracy and speed of image restoration, and a comparison is made with a coaxial holographic algorithm proposed in recent years. The algorithm proposed in this paper is compared and verified better. Secondly, the influence of various factors on the imaging system is analyzed. The influencing factors discussed in this paper include wavelength size, tilt diffraction, grating properties and axial diffraction distance. The grating properties include grating modulation, grating position and grating period. The different parameters of these factors are simulated and calculated, and the effect of these parameters on the imaging results is explored, and the optimal range of the system parameters is selected from the analysis results to reduce the effect of artificial setting parameters. Better imaging effect is obtained. Finally, an experimental system is built to verify the imaging system proposed in this paper. After analysis and discussion, the appropriate parameters are selected under the conditions of experimental equipment and environment. In order to obtain better experimental results, the oblique diffraction phenomenon occurred during the experiment was corrected. The diffraction pattern collected in the experiment is used to verify the algorithm, and the experimental and imaging results are analyzed.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TP391.41
【參考文獻】
相關(guān)期刊論文 前1條
1 劉海崗;許子健;王春鵬;郭智;張祥志;邰仁忠;;同步輻射X射線光斑信息對掃描相干衍射成像的影響[J];輻射研究與輻射工藝學(xué)報;2013年06期
，本文編號：2429142
本文鏈接：http://sikaile.net/kejilunwen/ruanjiangongchenglunwen/2429142.html
最近更新
教材專著
