共查询到19条相似文献,搜索用时 125 毫秒
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运用数字化标尺技术,研制GDG-2型光电等厚干涉实验仪,实现牛顿环直径的直接测量,并将测量值由LED数码管显示.该仪器简化了实验操作,提高了实验效率,提高了测量精确度. 相似文献
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传统的迈克尔逊干涉仪只能简单地呈现光的干涉图像,并不能生动体现光的波动特性及其形貌特征,且测量过程繁琐。针对这些问题,提出了一种基于数字全息技术的新型迈克尔逊干涉仪实验装置。该装置采用2个CCD相机代替传统迈克尔逊干涉仪中的平面反射镜,并引入与球面光相干的平面参考光与球面光发生干涉,利用数字全息技术直接获取2个CCD记录面上的球面光复振幅信息,然后通过最小二乘拟合获取球面波参数,并对球面光复振幅进行解调得到居中后的球面光复振幅,最后通过数字干涉的方法实现两球面光的干涉。实验结果表明,该装置能实时生动地显示入射球面光的三维图像和两球面光的干涉图像,同时根据拟合得到的参数能便捷地测量透明等厚介质的折射率,实验中测量了3种不同材料的折射率,其误差均能控制在±5%以内,有较高的测量精度。 相似文献
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利用数值方法研究了等厚干涉实验中平面玻璃存在凸凹缺陷时的干涉条纹,给出了不同缺陷尺寸、高度或曲率情况下的条纹变化性质,讨论了利用干涉图像进行缺陷检测的方法。该研究给出等厚干涉实验中的典型问题的数值求解办法,结果形象直观,便于理解。 相似文献
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牛顿环干涉实验的改进 总被引:2,自引:1,他引:1
研究光的干涉现象可以进一步加深对光的波动性的认识,产生光的干涉的仪器很多,牛顿环仪是一种常见的观察光的干涉的光学器件、用牛顿环仪可以观察到光的等厚干涉,对其干涉条纹有关量进行测量,便可以很精确地测得产生牛顿环干涉条纹的光学元器件的一些特性参数、用牛顿环仪可以测单色光的波长、组成牛顿环仪的平凸透镜的曲率半径,检验物体表面的光洁度和平面度.用牛顿环干涉实验测平凸透镜的曲率半径是大学物理实验中的基本实验.笔者根据多年的教学实践,认为该实验中存在一些问题,而且在数据处理方法上没有一个规范和统一的方法,本文就此进行探讨与研究. 相似文献
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介绍利用激光干涉与数字图像处理技术以及应用FFT分析干涉涤纹方法,分析并解决测量端面长度标准中条纹图的处理技术。应用这种方法不但提高了测试过程的自动化程度,而且大大地提高了测量精度。文中给出了最典型的端面长度标准量块的干涉条纹小数部分的实测结果。 相似文献
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基于棱镜对的单元件干涉可以获得透射物体的相位信息,即数字全息,具有结构紧凑、干涉条纹稳定、测量精度高等优点。采用光线追迹方法,综合考虑了棱镜对的方位角旋转、斜面偏心等参数,建立了光线追迹等效模型,仿真了数字全息干涉条纹,给出了条纹密度变化及倾斜的解析表达式。针对单模和多模光纤等微结构光学元件,获得了干涉数字全息图,并反演出其折射率分布。搭建了显微成像单元件干涉实验装置,获得了实际测量干涉图样,实验与仿真结果一致,证明了本模型的有效性。 相似文献
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长度测量中干涉条纹的自动识别技术研究 总被引:2,自引:2,他引:0
利用激光干涉与数字图像处理技术以及应用FFT分析干涉条纹方法,分析并解决了测量端面长度标准中条纹图的处理技术,应用这种方法不但提高了测试过程的自动化程度,而且大大地提高了测量结果的精度,并给出了最典型的端面长度标准量块的干涉条纹小数部分的实测结果. 相似文献
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Puchao Zheng Jianglei Di Wangmin Zhou Hao Wang Ruifeng Zhang 《Optics Communications》2009,282(22):4339-4344
By using digital holographic interferometory with phase multiplication, the visualized measurement of the acoustic levitation field (ALF) with single axis is carried out. The digital holograms of the ALF under different conditions are recorded by use of CCD. The corresponding digital holographic interferograms reflecting the sound pressure distribution and the interference phase distribution are obtained by numerical reconstruction and phase subtraction, which are consistent with the theoretical results. It indicates that the proposed digital holographic interferometory with phase multiplication can successfully double the fringe number of the interference phase patterns of the ALF and improve the measurement precision. Compared with the conventional optical holographic interferometory, digital holographic interferometory has the merits of quasi real-time, more exactitude and convenient operation, and it provides an effective way for studying the sound pressure distribution of the ALF. 相似文献
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Jinyou Shao Yucheng Ding Hongmiao Tian Xin Li Xiangming Li Hongzhong Liu 《Optics & Laser Technology》2012,44(2):446-451
Accurate layer-to-layer alignment, which is of prime importance for the fabrication of multilayer nanostructures in integrated circuits, is one of the main obstacles for imprint lithography. Current alignment measurement techniques commonly involve an image detection process for coarse alignment followed by a grating interference process for fine alignment. Though this kind of two-level alignment system is reasonable for measurement, when it is used in real imprint lithography, it is inconvenient because of the existence of a complex loading system that needs space for alignment. In this study, we propose a fine alignment method using only image detection using grating images and digital moiré fringe technology. In this method, though the gratings are also selected as alignment marks for accurate measurement, they do not interfere with the physics. The grating images captured from the template and wafer are used to measure angular displacement and to form parallel digital moiré fringes. The relative linear displacement between the template and wafer is determined by detecting the spatial phase of parallel digital moiré fringes. Owing to the magnification effect of digital moiré fringes, this method is capable of generating accurate measurements. According to the experimental results, this digital moiré fringe technique is accurate to less than 10 nm. In addition, without a complex grating interference system, this method has the advantage of being easy to operate. 相似文献
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Study on an automatic processing technique of the circle interference fringe for fine interferometry
The fringe center method (FCM) is an important digital processing technique of fringe patterns analysis for interferometry. In this paper, an improved automatic processing technique based on FCM was presented, which correlated the processing link and the looped feature of the circle fringe pattern. It also integrated several techniques including noise removal, the fringe thinning, the fringe patching, assignment of the fringe orders and wavefront reconstruction and can be executed orderly and automatically. Based on the new the algorithms of the fringe patching and assignment of the fringe orders, the fringe feature information was extracted automatically and the interference wavefront was reconstructed by Zernike polynomial fitting method. With the automatic processing technique, the circle interference fringe of the fine polished aluminum disks surface captured by the Twyman-Green interferometer was processed, and the surface profile and the parameters of the disk were obtained automatically. The experiments show that the improved automatic processing technique was more accurate and fast in measurement than the conventional one. It was convenient to use it in in-situ industry inspection. 相似文献