共查询到19条相似文献,搜索用时 109 毫秒
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光磁共振实验测量gF值方法的改进与拓展 总被引:10,自引:1,他引:9
分析了光磁共振实验测量gF值中传统方法存在的问题,提出了利用光抽运信号的变化来判断合磁场方向的改进措施,避免了实验过程中对合磁场的方向和大小的误判以及光抽运信号与共振信号的混杂.同时,拓展了原有的测量方法,丰富了实验内容. 相似文献
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探讨光磁共振实验中测量gF值的方法 总被引:13,自引:4,他引:9
采用与示波器同步的扫描场探测光磁共振,使光磁共振信号稳定:选择扫场的同一点(最好选在峰点或谷点)作参考点,有利于结合实际情况gF值,并克服和惯用方法的缺陷,提出了判别光轴运信号和磁共振信号的方法。 相似文献
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论述了在交变磁场下测量磁光薄膜动态法拉第效应的原理和方法,利用此方法,在不同的调制磁场强度和频率下测量磁光薄膜的动态法拉第旋转特性,获得了较好的测量结果,并对测量误差进行了分析。 相似文献
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分段自相关动态光散射法测量亚微米粒度 总被引:5,自引:0,他引:5
介绍了动态光散射法测量微粒尺度的原理,通过对相关函数相对的分析,提出了分段自相关的方法,该方法解决了高速,大数据量采集的困难,又不显著影响相关函数的精度,给出了实验装置及实验结果,测量结果与标准样品的标称值相符。 相似文献
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We report a method for simultaneously and directly measuring all six-degrees-of-freedom(six-DOF) motion errors of a rotary axis. Such a method combines the principles of laser interferometry and laser collimation measurement. One reference rotary axis and two retro-reflectors are used to achieve simultaneous sensitivity to all six errors in a full-circle measuring range. As no separation models are required, our method is capable of dynamically measuring these errors in real time and conveniently determining the origin of the errors. An automatic measuring device is built. The effectiveness of our method is experimentally demonstrated. 相似文献
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太阳能帆板平面度测量系统中光斑图像处理方法研究 总被引:1,自引:0,他引:1
太阳能帆板的平面度测量是卫星生产制造过程中的一个关键技术,现有的测量方法存在着精度差,效率低的问题。该文在基于实际工程课题的太阳能帆板平面度测量系统基础上,针对测量系统中光斑图像处理这一关键技术进行了详细的研究。对现有测量方法进行了比较与分析,介绍了测量系统的基本原理、图像采集系统设计过程中采取的主要措施、图像处理的具体方法与步骤和测量系统的基本组成。提出了一种新的快速滤波算法和光斑图像能量中心求取算法,大大提高了光斑图像能量中心的求取精度和实时性,提高了太阳能帆板平面度的测量精度。给出了光斑图像处理结果、静态测量重复性误差以及实际帆板的测量结果与分析,实验结果证明所采用的光斑图像处理方法可以满足对实际帆板测量精度的要求。 相似文献
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以物像等大成像法同时测量自聚焦透镜的轴心折射率n_0和聚焦常数g 总被引:2,自引:1,他引:1
本文通过对目前自聚焦透镜光学参数测量方法的分析,提出了能同时测量自聚焦透镜轴心折射率n_0和聚焦常数(二次梯度常数)g的物像等大法,所得结果表明该方法有实用价值,同时可简化测量设备。 相似文献
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The German standard DIN 45 635 Part 1 describes the determination of sound power level by the envelope measuring method. The method can only be used under certain conditions which arise in a number of industrial measuring tasks. Such conditions do not arise in other tasks of a similar nature. Machines with many similar working positions—e.g. spinning frames—seriously violate one of the conditions. That is, the sound source can be considered approximately as a point source. This can introduce a systematic error of up to 2 dB when the sound power level is determined by the envelope measuring method.In this paper this is proved both theoretically and experimentally. A possibility for correction is given. 相似文献
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A method for measuring the geometrical dispersion caused by diffraction processes in sound beams is considered. The experimental setup is described, and the results of measuring the longitudinal distributions of both the additional shift of the phase invariant of a three-frequency wave and the dispersion parameter are presented. The local character of the geometrical dispersion, which manifests itself within the near-field zone of the beam, is revealed, and the presence of two different mechanisms underlying its nonuniform spatial distribution is pointed out. 相似文献