共查询到19条相似文献,搜索用时 109 毫秒
1.
在数字散斑干涉测量中,照明光的不均匀或被测试物反射光的不均匀,会导致条纹图像不均匀,严重时甚至会引起条纹的丢失.在分析剪切型散斑干涉原理的基础上,基于散斑相位差的主值在(-π,π]均匀分布的假设,提出了减模式下光强不均匀的校正方法,即通过构建一个新的强度分布函数,分区域消除背景光强,从而消去光强调制项,使干涉条纹图的显示强度变得均匀.将该方法应用于受到强烈冲撞的航空复合材料的剪切散板干涉测量中,将原来隐藏在光强较弱区域的条纹清晰地显示了出来.表明本文的方法能有效地降低光强不均匀性对散斑干涉条纹图的影响. 相似文献
2.
3.
用图形化编程模拟杨氏实验 总被引:1,自引:0,他引:1
历史上,杨氏实验首次证实了光的波动性,成为波动光学必不可少的重要学习内容之一。但由于杨氏实验的条件极为苛刻,当采用普通光源时,在通常的实验条件下,获得的干涉条纹极其微弱,难以分辨。这里介绍一种采用VisualBasic高级语言制作的杨氏双缝干涉实验的模拟演示软件,它能在计算机上同步清楚地显示实验装置、干涉条纹的位置及光强分布等。并具有人机交互功能,通过鼠标点击,可调节有关参数,实时显示干涉条纹位置及光强分布的变化规律。使用该软件辅助教学,非常直观、方便。 相似文献
4.
四象限探测器在探测区域具有象限化特征,当干涉条纹方向与探测器坐标轴方向呈不同的夹角时,各象限探测单元的不同位置可探测到不同空间位置的干涉条纹光强分布,利用光强在探测单元内的矢量叠加原理,就可探测到与干涉条纹同周期但相位不同的信号。当旋转探测器到某一特定角度时,发现总有其中两个象限探测单元的信号相位正交,当干涉条纹周期改变时,仅需重新仔细旋转探测器,便可检测到该周期条纹的正交信号。通过理论分析和数值模拟,验证了该方法的可行性和实用性。与传统检测方法相比具有操作简便,适应性强,便于仪器化等优点。 相似文献
5.
干涉条纹的相位变化与干涉条纹中某一固定点的光强密切相关,基于这一原理,通过对干涉场光强分析,提出并设计了一种用于干涉条纹相位锁定的控制系统.光电探测器检测干涉条纹中固定目标点的光强,并以该光强电压作为反馈控制信号,利用声光调制器对干涉系统中两束高斯光束中的一束进行实时频率调制,将光强电压控制在一个固定值,实现干涉条纹的相位锁定.构建了条纹锁定控制系统控制对象的理论模型,通过实验进行了验证,并基于该模型的特点设计了条纹锁定控制器.实验结果表明:在400Hz的控制频率下,干涉条纹相位漂移不超过±0.04个条纹周期,满足干涉光刻的曝光需求. 相似文献
6.
7.
采用飞秒激光脉冲研究聚苯基喹恶啉共轭有机高聚物薄膜中由法布里-珀罗效应产生的光谱的干涉条纹结构,并通过改变脉冲的峰值功率,测到的光谱条纹结构的变化,说明是依赖光强的非线性折射率的变化引起了干涉条纹的改变,通过平均功率不变只改变脉冲峰值功率方法,验证了热效应在干涉条纹的变化中不起主导作用。 相似文献
8.
9.
10.
11.
12.
提出了一种利用激光干涉仪测量光波波长的方法。通过改变在光的传播路径上垂直放置的透明玻璃与光传播方向的角度,使相干光的光程差发生变化;利用干涉条纹与转过角度、透明玻璃厚度之间的关系,通过激光干涉实验能准确测量出光波的波长。 相似文献
13.
14.
The intensity distribution in the interference pattern of a multiple-slit aperture illuminated with the partially coherent light is examined experimentally. The experimental results showing excellent agreement with the theoretical predictions indicate both a gradual loss in the contrast of interference fringes and a broadening of the principal maximum fringes with decreasing spatial coherence of the illumination. 相似文献
15.
16.
We describe a simple experiment on the interference of refraction light by ultraweak liquid surface wave at low frequency. The surface wave profile is generated by electrically driven vertical oscillations exciters. The high visibility and stable laser interference fringes were gathered experimentally. The theoretical light intensity distribution agrees well with the observations. In particular, we show the relation between the light intensity distribution and the characteristic features of the surface wave. In addition, we can measure the amplitude and wavelength of the ultraweak liquid surface wave at low frequency by this means. 相似文献
17.
18.
Interferometry is widely used in nano-scale micro-topography measurement. In order to improve its accuracy and sensitivity, a high-sensitivity homodyne interferometry based on white light interference and laser secondary interference was proposed. A high-sensitivity homodyne interferometry system was designed, and the zero point of the laser secondary interference was used to locate the dark striation of white light interference, so that it could reach the maximum slope when optical path difference was zero. The signals of white light and laser were analyzed by using the wave principle and intensity formula of interference fringes, and a sensitivity calculation method based on the combination of white light and laser interference signal was proposed. The system and its sensitivity were simulated. Finally, the optical path was built, and the white light interference fringes were adjusted to the dark striations position, so as to locate the zero position of laser secondary interference and carry out the data acquisition. It is showed that the sensitivity of the measurement method is at least 1 832 times higher than that of the laser secondary interference, and the corresponding measurement uncertainty is only ±0.288 7 mV. The measurement system can effectively solve the problem of large amount of calculation in traditional interferometry, and has high sensitivity, stability and reliability. Copyright ©2022 Journal of Applied Optics. All rights reserved. 相似文献