带色散补偿的Sagnac干涉仪系统在白光场快照偏振测量中的应用

发布时间：2017-12-27 08:22

本文关键词：带色散补偿的Sagnac干涉仪系统在白光场快照偏振测量中的应用　出处：《合肥工业大学》2016年硕士论文　论文类型：学位论文

更多相关文章： 快照偏振 Sagnac干涉仪 白光 Stokes矢量

【摘要】：光谱成像技术集传统成像和光谱学于一身从目标中获取空间域光谱信息,这项技术在早些时候主要应用于遥感探测,到目前以广泛应用于生物医学领域,作为生物医学的强大分析工具。同时,偏振测量技术也已经在遥感监测,目标识别,生物医学领域有了实际应用。因此,研究利用空间光谱技术来获取包括线偏振、圆偏振信息在内的各类偏振信息的测量系统具有必要性和迫切性。本文提出一种应用于白光场景下的快照偏振测量技术,此项技术结合Sangac干涉仪原理和空间快照偏振测量方法,解决了在空域中对二维Stokes参数的测量问题。详细阐述了带色散补偿Sangac干涉仪的结构原理,通过对其结构的搭建达到了同时测量至少3个偏振分量的目的,解决了多设备同时测得图像的配准问题。DCPSI结构可以在FPA上获得包含目标场景偏振信息的二维强度条纹图,该图是包括总光强S0、线偏振分量S2、圆偏振分量S3在内的三个斯托克斯(stokes)矢量的二维调制函数；针对这种条纹图,采用一种解调方法：使用快速傅里叶变换(FFT)在傅里叶域中对DCPSI的二维强度条纹图进行频率空间滤波,并获取Stokes矢量相关空间域表达式。并且对白光场Sangcac偏振计结构进行了优化,研究了其通光效率。实验结果证明了利用Sangac干涉仪结构可以在白光场景下获取相关偏振信息,并且不需要进行结构扫秒,避免了由于移动系统光学器件所带来的不必要误差。
[Abstract]:Spectral imaging technology combines traditional imaging and spectroscopy technology to acquire spatial spectrum information from target. This technology is mainly applied to remote sensing detection earlier, and is widely used in biomedicine as a powerful tool for biomedical analysis. At the same time, polarization measurement technology has also been applied in the field of remote sensing monitoring, target recognition and biomedicine. Therefore, it is necessary and urgent to study the measurement system of all kinds of polarization information, including linear polarization and circularly polarized information, using spatial spectrum technology. In this paper, a snapshot polarization measurement technology applied to white light scene is proposed. The technology combines the principle of Sangac interferometer and the spatial snapshot polarization measurement method to solve the problem of measuring two-dimensional Stokes parameters in airspace. The structure and principle of the Sangac interferometer with dispersion compensation is expounded in detail. By constructing its structure, at least 3 polarization components can be measured at the same time, and the image registration problem of multi device simultaneous measurement is solved. The DCPSI structure can obtain two-dimensional fringe intensity target scene contains polarization information in FPA, the figure is three Stokes, including the total intensity of S0 linear polarization components S2, S3, circular polarization (Stokes) two-dimensional vector modulation function; the fringe pattern, using a kind of demodulation method: Fast Fourier transform (FFT) in the Fourier domain in the two-dimensional intensity of DCPSI fringe frequency spatial filter, and obtain the Stokes vector space domain expression. The structure of Sangcac polarimeter in white light field is optimized and its luminous efficiency is studied. The experimental results prove that using Sangac interferometer structure, we can get relative polarization information in white light scene, and do not need to scan for structure, which avoids unnecessary errors caused by optical devices in mobile system.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TP751

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