共查询到20条相似文献,搜索用时 93 毫秒
1.
2.
3.
原多普勒效应验证实验仪器在使用过程中出现数据不稳定、重复性差、维修率高等问题.为了解决上述问题,提高实验的精度与准确度,对原实验装置的相关部分进行了改进.通过比较原实验装置和改进后的实验装置,分析了原实验装置的缺点与不足,并总结改进后装置的优点. 相似文献
4.
5.
6.
7.
8.
9.
10.
11.
12.
V. Aboites J. H. García-López V. Pinto A. V. Kiryanov M. A. Barrera 《Laser Physics》2008,18(5):632-636
The present work presents the analysis of a photonic device. Starting from a laser model, it is shown that, if a two-level simplification is used and both low pumping and no losses are assumed, a second-order control system model is obtained. This model no longer describes a laser, but only a photonic device. The system response to a step input is analyzed and the results are compared with experimental data obtained when pumping a neodymium crystal with a diode laser. Both theoretical and experimental results are then compared with the analyzed photonic device. A good qualitative agreement is shown between the analytical, experimental, and computational results. 相似文献
13.
折射率调制型光纤传感器在溶液浓度测量中的应用 总被引:8,自引:0,他引:8
本文详细报道了用折射率调制型光纤传感器测量溶液浓度的原理及实验装置。为了消除光源光强的不稳定性对测量精度提高的影响,我们提出用光学双稳态装置稳定光源的输出功率并将它用于实际测量中,实验结果表明:本方法用于测量溶液的浓度在灵敏度、精度和稳定度方面都有较大的提高,并且可用于在线监测。 相似文献
14.
15.
16.
本文阐述了采用光子注入法实现光纤激光器的偏振开关操作.这种新颖的全光开关器件具有极低的阈值(0.1μW).对操作机理、实验实现和器件特性. 相似文献
17.
18.
Aline Souza de Paula Francisco Heitor Iunes Pereira-Pinto 《Journal of sound and vibration》2006,294(3):585-595
Pendulum is a mechanical device that instigates either technological or scientific studies, being associated with the measure of time, stabilization devices as well as ballistic applications. Nonlinear characteristic of the pendulum attracts a lot of attention being used to describe different phenomena related to oscillations, bifurcation and chaos. The main purpose of this contribution is the analysis of chaos in an experimental nonlinear pendulum. The pendulum consists of a disc with a lumped mass that is connected to a rotary motion sensor. This assembly is driven by a string-spring device that is attached to an electric motor and also provides torsional stiffness to the system. A magnetic device provides an adjustable dissipation of energy. This experimental apparatus is modeled and numerical simulations are carried out. Free and forced vibrations are analyzed showing that numerical results are in close agreement with those obtained from experimental data. This analysis shows that the experimental pendulum has a rich response, presenting periodic response, chaos and transient chaos. 相似文献
19.
20.
在多种光源的45°/0°照明观测条件下,提出了一种测量金属涂料闪光效果的评价方法和开发了测量装置。根据不同的色彩分布和闪光等级,选取39张金属漆色卡并构建了测试样本库。对采集样本的多光谱图像进行校正,以符合不同光源下观察者的视觉响应。通过设定与图像相关的阈值分离闪光点和背景,以BYKmac的测试数据为标准进行标定,得到了闪光面积、闪光强度和闪光等级算法。在D65和A光源照明条件下,进一步比较实验装置对样本闪光等级的测量结果与视觉评价数据的相关性。实验结果表明:在D65光源下,实验装置和人眼数据相关系数为0.848;在A光源下,实验装置和视觉数据的相关系数为0.851。实验装置的测量效果优于现有的测量设备。 相似文献