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抖动偏频激光陀螺速率阈值特性研究 总被引:9,自引:9,他引:0
本文从理论上分析了正弦抖动偏频激光陀螺速率阈值特性,提出了一种用于测试抖动偏频激光陀螺速率阈值的试验方案,结果表明激光陀螺在零速率处存在与理论相符合的小死区,动态锁区值与陀螺速率阈值具有确定的对应关系。 相似文献
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Zn/O ratio and oxygen chemical state of nanocrystalline ZnO films grown at different temperatures 下载免费PDF全文
ZnO nanocrystalline films are prepared on Si substrates at different temperatures by using metal-organic chemical vapour deposition (MOCVD). It is observed that when the growth temperature is low, the stoichiometric ratio between Zn and O atoms has a large deviation from the ideal ratio of 1:1. The ZnO grains in the film have small sizes and are not well crystallized, resulting in a poor photoluminescence (PL) property. When the temperature is increased to an appropriate value, the Zn/O ratio becomes optimized, and most of Zn and O atoms are combined into Zn-O bonds. Then the film has good crystal quality and good PL property. If the temperature is fairly high, the interfacial mutual diffusion of atoms between the substrate and the epitaxial film appears, and the desorption process of the oxygen atoms is enhanced. However, it has no effect on the film property. The film still has the best crystal quality and PL property. 相似文献
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由于加工超光滑表面的古典法对加工者的经验要求较高,而且不同的加工者对抛光时间长短的控制也有较大的差别,因而下盘时机的准确判断将会对超光滑表面的加工质量产生严重的影响。为此,对所加工的全反射棱镜的超光滑表面抛光不同的时间,并在全反射条件下,根据全反射棱镜背向散射光斑的大小和亮暗的程度来判断所加工超光滑表面加工质量的检测方法,最终给出超光滑表面的抛光质量随抛光时间的变化。在实验结果的基础上得出了抛光质量随抛光时间交替变化的基本规律,并根据加工经验总结出了超光滑表面加工过程中的注意事项和判断下盘时机的基本方法。 相似文献
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采用光催化还原法在不同温度热处理的TiO2薄膜表面沉积Ag纳米颗粒,制备了Ag/TiO2纳米薄膜材料。通过UV-Vis吸收光谱表征对比了不同温度热处理的TiO2对Ag粒子光催化沉积的影响,发现500℃退火处理TiO2薄膜较利于Ag纳米粒子的光催化沉积;在650 nm红色激光照射下,500℃退火处理的Ag/TiO2样品具有明显的光致变色现象,对此变色过程中涉及的机理进行了讨论,且发现随着Ag纳米颗粒光催化沉积时间的增长,Ag/TiO2薄膜光致变色的响应速率提高,但Ag纳米颗粒过多会抑制Ag/TiO2薄膜的变色响应速率。 相似文献