基于朗奇光栅的结构光照明成像技术
发布时间：2019-02-23 19:52
【摘要】：相位分布在光学系统中对于测量物体表面形状或者厚度以及细节信息具有重要作用,所以对于相位的恢复计算一直是物理学领域的热点问题。相位恢复的实质是通过容易测量的强度信息重建目标光场的复振幅函数,既可由全息的方式也能通过迭代衍射计算的方式得以实现。特别是迭代型相位恢复算法,由于其具有成像光路及装置简单的特点,受到了越来越多的关注。近几年的相位恢复算法都是在扫描方式以及算法约束改进等方面有所创新,对于改变相位恢复成像系统照明方式的研究还鲜有文献。本文的主要研究内容就是将结构光照明的方式引入到相位恢复系统中,提出一种基于朗奇光栅的结构光照明成像系统。现将主要研究内容总结如下:首先设计成像系统光路,分析成像系统的成像过程及原理,确定系统内元件的位置和各项参数。并且探究朗奇光栅的性质,分析比较它和正弦光栅的异同,对其对于照明光的调制作用进行深入解析及实践。并对于所提出的基于朗奇光栅的结构光照明成像系统进行仿真实验,探究其恢复图像的精度和速度,并与近年来提出的一种同轴全息算法做比较,对于本文所提出的算法作更好的比较验证。其次分析各项因素对成像系统的影响,在本文中讨论的影响因素包括波长大小、倾斜衍射、光栅性质以及轴向衍射距离。其中光栅性质中又包括光栅调制、光栅位置和光栅周期影响。对这些影响因素设置不同的参数进行仿真计算,探究它们对于成像结果的作用,并从分析结果入手,选择系统各项参数的最优范围,以减少人为设置参数的影响,获得更优的成像效果。最后搭建实验系统,对本文所提出的成像系统进行实验验证。并且经过分析讨论后在实验设备及环境允许的条件下,在实验中选择合适的参数。对于实验过程中出现的倾斜衍射现象进行校正,以获得较优的实验结果。用实验中采集的衍射图案进行算法验证,并对于实验以及成像结果进行分析。
[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.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TP391.41
本文编号：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.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TP391.41
【参考文献】
相关期刊论文 前1条
1 刘海岗;许子健;王春鹏;郭智;张祥志;邰仁忠;;同步辐射X射线光斑信息对扫描相干衍射成像的影响[J];辐射研究与辐射工艺学报;2013年06期
，本文编号：2429142
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