共查询到19条相似文献,搜索用时 430 毫秒
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在时域中求解得到,光路中存在色散介质的情况下,白光双光束干涉光强度.由此证明了:用白光干涉法测量得到的是白光在色散介质中的群折射率,而并非相关报道中认为的折射率;讨论了介质厚度及色散对于涉条纹的可见度和干涉条纹显现时动镜移动范围的影响.上述结论得到了实验验证. 相似文献
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本文介绍了掠入射法测量各种透明介质折射率的实验过程与方法,并用钠光源掠入射法测量乙醇、纯净水和丙三醇的折射率,在实验拓展中对空气、三棱镜的折射率测量进行了探讨。 相似文献
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从几何光学出发,推导了毛细管干涉仪的从柱面透镜到接收屏的光线的光程.对光线追迹模拟,结果表明毛细管干涉仪的干涉条纹的形成可用双光束的干涉来解释.从柱面不同位置入射的两条光线可能具有相同的光程,而且从柱面透镜不同位置出发的两条光线可能到达接收屏的同一点,当它们满足相干条件时,就会形成干涉条纹.建立了干涉条纹的计算机模拟程序, 模拟了毛细管中液体折射率、毛细管内径、外径对干涉条纹的影响. 结果表明实验中应使用薄壁毛细管, 由于干涉条纹对柱面透镜到毛细管之间的距离非常敏感, 为提高精度, 建议在实验中用已知折射率的标样来确定这一距离. 相似文献
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Multiple-beam white-light Newton's fringes in transmission are produced in a Newton's interferometer containing a liquid sample and followed with a grating spectrograph. An equation describing the shape of the formed interference fringes is derived. A simple procedure is introduced for analyzing the resulting interference fringes. This enables the determination of both: the liquid refractive index, the fringe order of interference and the thickness at the point of contact. Errors of the measured liquid refractive index are discussed. The method is used for measuring the refraction and dispersion of glycerin, dimethylformamide (DMF) and water across the visible spectrum. The method is a single-shot, static, material-economic and low-cost interferometric one. 相似文献
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利用联合付里叶变换谱干涉法测量透镜焦距 总被引:3,自引:0,他引:3
本文提出了采用联合付里叶变换频谱干涉法测量透镜焦距的方法。输入面上两个分布完全相同的图像经光学付里叶变换在频谱面上得到二者付里叶变换频谱的干涉条纹,通过测量干涉条纹的间距即可得到透镜的焦距。该方法装置简单、操作调整方便;易于采用实时空间光调制器、CCD及微机实现快速自动测量,且具有较高的精度。文中进行了原理分析和实验验证。 相似文献
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A novel photodetection system for a homodyne distance measuring interferometer by means of fringe counting method is presented. The system is based on applying compact size integrated photodetector operating with fringe pattern having fixed, finite period. 13-element integrated photodiode arranged in novel signal processing scheme receives interference fringes movement. Additional lens is used to adjust the fringe period to photoelements’ distances. Due to the proposed configuration of the photoelement's signal processing and the applied lens the system has reduced sensitivity to interference fringe period errors caused by the angular misalignment of interfering beams. The theoretical analysis and experimental verification of the system metrological feasibilities are presented. Comparison of performance of examples of standard and novel detection systems is shown finally. 相似文献
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针对当前液晶透镜盒间隙测试存在的难题, 文中提出采用线偏振干涉法测试方法, 采用光强均匀分布的单色光入射, 检偏器的偏光轴方向与起偏器的偏光轴垂直或者平行, 液晶透镜的液晶取向层的摩擦方向与起偏器偏振轴夹角为45°, 此时干涉条纹亮暗差别最明显. 利用液晶透镜中心保持预倾角不变的透过率以及其他位置透过率最大值来计算液晶透镜的盒间隙, 该方法简单、可靠, 因采用光学手段测试, 其精确度相对较高.
关键词:
液晶透镜
盒间隙
线偏振光干涉
透过率 相似文献
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对部分相干光束的双缝实验干涉条纹进行了研究。利用转动的毛玻璃以及两个透镜构成了一个简单的产生部分相干光束的光学系统,通过调整毛玻璃与两个透镜的共焦点之间的距离,可以定量地控制光束的相干性。对不同相干性的光束经过双缝干涉之后的光强进行了实验观测,发现光束的相干性会对双缝干涉条纹的衬比度产生影响,光束的相干性越低,条纹衬比度也越小。并对实验结果进行了理论模拟,理论数值模拟的结果与实验观测结果基本一致。 相似文献
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Marella de Angelis Sergio De Nicola Pietro Ferraro Andrea Finizio Giovanni Pierattini 《Optics and Lasers in Engineering》1998,30(3-4)
We describe a technique based on fast Fourier transform and least-squares fit for automated analysis of moiré fringe patterns for accurately measuring the focal length of lenses. An interference fringe pattern is produced by a reflective diffraction grating interferometer and illuminates the test lens. Moiré fringes are generated by digitally superimposing the magnified fringe pattern imaged by the lens on the interference fringe pattern without the test lens. We analyze two common ways to generate the digital moiré effect: multiplication and subtraction with successive rectification of the two digitally stored intensity distributions, and we show that in the latter case by means of the described technique it is possible to determine the moiré spatial frequency by a simple and fully automated procedure. 相似文献