共查询到17条相似文献,搜索用时 78 毫秒
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准确地测定金属丝的杨氏模量,关键是准确测量其伸长量及直径。用典型的光杠杆法带有较大的测量误差,我们用劈尖干涉进行金属丝直径的测量和用干涉条纹的变动情况对其伸长量的变化进行跟踪测量,提高了测量精度。 相似文献
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Mach-Zehnder干涉仪适用于研究气体密度迅速变化的状态。由于气体折射率的变化与其密度的变化成正比,而折射率的变化将使通过气体的光线有不同的光程,因此可通过干涉臂变化对干涉条纹图像效果的影响得到气体密度。实测中,采用图像采集卡和CCD来接收Mach-Zehnder干涉仪产生的条纹图像,再通过计算机对条纹图像的条纹间距进行处理,从而得到气体密度的变化状态。从光干涉理论出发,对Mach-Zehnder干涉条纹图像特征进行了分析,建立了Mach-Zehnder干涉条纹的数学模型,并根据此模型设计了处理Mach-Zehnder干涉条纹图像的算法。算法包括图像的预处理(即图像的噪声提取)、图像的二值化及图像的细化。 相似文献
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利用菲涅耳双镜测金属线膨胀系数 总被引:2,自引:0,他引:2
分析了菲涅耳双镜在干涉实验中 ,由金属受热膨胀引起的光源位置变化对干涉条纹的影响 ,导出金属受热时绝对伸长量与干涉条纹位置变化之间的关系 ,并通过它对黄铜棒的线膨胀系数进行测量。 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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一般国内的大学物理和大学物理实验教材都只介绍干涉圆条纹和直线干涉条纹,用迈克耳孙干涉仪可以调制出椭圆和双曲线干涉条纹;但对条纹形成的理论推导很少涉及.本文根据点光源双光束干涉理论,分析基于点光源照明的迈克耳孙干涉实验中所产生的各种可能的干涉条纹:双曲线形干涉条纹、圆形干涉纹、椭圆形干涉纹及直线形干涉纹的形成条件.本文也对等倾干涉条纹、等厚干涉条纹与既非等倾也非等厚干涉条纹的机理进行分析和比较.通过对每一种干涉图样的解析分析和比较,旨在对迈克耳孙干涉实验有更全面和更深刻的了解. 相似文献
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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
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迈克尔逊干涉仪光程差公式及条纹特点详解 总被引:1,自引:0,他引:1
本文通过对迈克尔逊干涉仪干涉原理和平涉光路的探讨,详解了迈克尔逊干涉仪进行干涉对的光程差公式;对条纹密度特点进行了进一步说明。从理论分析方面为使用迈克尔逊干涉仪提供了更明晰的帮助。 相似文献
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观察法布里—珀罗标准具和共焦球面扫描干涉仪在共焦前后的多光束干涉图像,根据干涉条纹的变化和干涉仪频谱信号强弱进行精确调焦的方法,提高了实验效率并且得到了较好的实验结果。 相似文献
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Interference of dissociating wave packets in the I2 molecule driven by femtosecond laser pulses 下载免费PDF全文
The interference between two dissociating wave packets of the I2 molecule driven by femtosecond laser pulses is theoretically studied by using the time-dependent quantum wave packet method.Both the internuclear distanceand velocity-dependent density functions are calculated and discussed.It is demonstrated that the interference pattern is determined by the phase difference and the delay time between two pump pulses.With two identical pulses with a delay time of 305 fs and a FWHM of 20 fs,more interference fringes can be observed,while with two pump pulses with a delay time of 80 fs and a FWHM of 20 fs,only a few interference fringes can be observed. 相似文献