共查询到19条相似文献,搜索用时 140 毫秒
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分析了利用掺铁铌酸锂晶体作介质的简并四波混频及其在干涉计量术中应用的原理,描述了被测透明样品的表面各光波及其干涉形成的透射条纹及反射条纹,利用光折变晶体的介电驰豫特性,求得透射条纹和反射条纹的对比度随时间变化的公式及各参数的相互关系。对由透射条纹及反射条纹计算被测透明物体样品折射率和厚度不均匀性的方法作了数学分析,提出一种新型四波混频实时测量透明物体的光学不均匀性的方法和实验光路,对相关参数对测量过程及测量结果的影响作了探讨,得到了平板玻璃样品的干涉条纹图像,计算出实验结果。 相似文献
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在等厚干涉实验中,我们可以利用两平面间空气隙所产生的干涉条纹数目来确定微小厚度(如金属箔纸的厚度),等厚干涉原理在光学加工、计量中的应用非常广泛.现介绍“三块互检法”在光学测量中的应用在光学测量中,常常需要检测平面光学零件的表面面形精度,通常的办法是用一块标准平面平晶(俗称标准样板)来检测.标准样板的工作面与光学零件待测面贴放一起,在白光或其他光源照射下;能够在两接触面上观察到干涉条纹.因为标准样板面形精度很高.可以认为观察到的干涉条纹数即为待测光学零件平面的面形精度,精度干涉条纹总数XA/2.平… 相似文献
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提出了一种基于条纹反射和相移技术的类镜面三维面形测量的新方法。首先在平板显示器上显示正弦条纹,然后用CCD相机分别记录由待测面和标准面反射的正弦条纹像,通过相移得到各自的相位分布,与标准面相位分布相比较得到待测表面起伏引起的相位变化。推导了相位变化量与待测表面梯度的对应关系,分别对待测面进行水平和垂直两个方向光栅相位测量,通过计算可得到梯度分布并由梯度分布恢复待测表面面形。同时初步分析了影响条纹反射技术测量精度的因素。测量中,光栅由计算机产生,可以实现精确的相移,而且可以方便地调节光栅的周期及方向,通过预设标记点来引导相位展开有效地解决待测面和标准面的条纹对应问题。实测了建筑用釉面瓷砖表面起伏,验证了该方法的可行性。 相似文献
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光的干涉法测金属线胀系数 总被引:6,自引:0,他引:6
当用两块平板玻璃制作出的空气劈尖顶角发生变化时 ,应用 CCD可观察到劈尖表面移动的干涉条纹。移过某一点的干涉条纹数决定劈尖项角的变化。若劈尖项角的变化是由金属受热膨胀引起的 ,则可导出金属受热膨胀的绝对伸长量与移过的条纹数之间的关系 ,并通过它计算金属的线胀系数。通过对黄铜棒的测量 ,结果表明该方法是可行的 相似文献
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针对现有光学玻璃弹性模量测量周期长、测量过程复杂等问题,提出了一种利用计算机图像处理技术快速测量小样品光学平板玻璃弹性模量的方法。基于接触力学理论和牛顿环干涉原理推导出测量光学玻璃弹性模量的解析式,利用图像处理技术的优势,通过摄像头拍摄牛顿环干涉图像,设计MFC监控与单张图片拍摄界面程序,自动测量牛顿环干涉图像中心黑斑半径,最后根据光学玻璃弹性模量与牛顿环干涉图像中心黑斑半径及牛顿环中心应力之间的关联关系,实现小样品光学玻璃弹性模量的快速测量。实验结果表明:在应力31.17 N~55.11 N范围内,光学玻璃弹性模量的测量相对误差不超过±8.8%;在应力55.11 N~71.07 N范围内,测量相对误差不超过±16%。 相似文献
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A single shot algorithm using a Fizeau interferometer was used to measure the form profile of a spherical smooth surface by means of fringe thinning process, which plays an important role in fringe patterns analysis. In this paper, an automatic processing technique based on the fringe thinning process is presented. The circular interference fringe pattern of the spherical smooth surface captured by the Fizeau interferometer was corrected by using the flat fielding method and then processed. Based on the fringe thinning and the assignment of the fringe orders, the information on the fringe feature was recovered automatically and the interference wavefront was reconstructed by the Zernike polynomial fitting method. The results were compared with the results measured by Bünnagel method, and the results were in good agreement. This means that the single shot algorithm is reliable, fast, and less sensitive to vibration and turbulence in surface form measurements. Simulation fringes with the ray tracing technique were obtained to match the practical fringes. 相似文献
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P. J. Chandley 《Optical and Quantum Electronics》1979,11(5):407-412
When a rough surface is viewed in an interference microscope with tilt fringes introduced, the effect of the roughness is to reduce the average visibility of the tilt fringes. The relationship between the standard deviation of surface height and the average visibility of the tilt fringes is derived, and experimental results are presented of measurements made on ground glass surfaces using a Linnik interference microscope. 相似文献
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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
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Optical transmission spectroscopy on metal films with slit-groove pairs is conducted. Spectra of the light transmitted through the slit exhibit Fabry-Perot-type interference fringes due to surface plasmons propagating between the slit and the groove. The spectral dependence of the period of interference fringes is used to determine the group velocity of surface plasmons on flat gold and silver surfaces. 相似文献
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Kenichi Hibino Yangjin Kim Sangyu Lee Yohan Kondo Naohiko Sugita Mamoru Mitsuishi 《Optical Review》2012,19(4):247-253
The absolute optical thickness and the surface shape of a glass plate of 7-in. square and 3.1mm thick was simultaneously measured by three-surface interferometry using a wavelength tuning Fizeau interferometer. The wavelength of a tunable diode laser is scanned linearly from 632 to 642 nm, at which the initial and the final phases of the interference fringes for the surface shape and for the optical thickness were separated and measured by a tunable phase-shifting technique. The number of phase variations in the interference fringes during the scanning is counted by discrete Fourier analysis, in which systematic errors caused by a nonlinearity in the wavelength scanning is corrected by a correlation analysis between the observed and theoretical interference fringes. Experimental results demonstrate that the systematic errors in the measured value were 15 nm for the surface shape and 0.6 μm for the absolute optical thickness. 相似文献
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激光束照射到表面被粘污的反射镜上会产生干涉环,入射光束和反射光束在被粘污表面产生散射光干涉.随着入射角的变化,光束在反射镜玻璃片内光程改变,引起干涉环从中心冒出或缩进,干涉环级数的变化与入射角的平方成正比. 相似文献