石英摆片激光切割技术研究

针对激光切割技术在典型石英结构——加速度计摆片加工成形中的应用,探讨了激光与石英材料的作用机理,进行了激光切割成形以及消应力试验。在此基础上详细分析了激光切割工艺参数和后处理对石英摆片成形质量的影响,对精密石英结构的制造具有普遍的意义。     

科学史上著名公案——聚合水事件

苏联科学家费德亚金1962年报告了他的一个蕈大发现.用来得出这个重大发现的实验很简单:把蒸馏水放在一个小容器中加热,用一束石英毛细管收集水蒸气,让水蒸气在管壁内冷凝.     

航天晶体元器件发展趋势分析

回顾航天晶体元器件的发展历史,分析当前晶体元器件国内外技术现状,结合航天需求的变化形势,研究航天晶体元器件的发展趋势,并提出航天晶体元器件发展建议与措施.     

抛光参量对抛光光学元件亚表层的影响

研究了抛光粉的种类、抛光速度的大小以及抛光玻璃的性质等抛光参量对光学元件亚表层特征的影响,并结合抛光机理进行了分析。     

QA650—成本极低的加强型石英挠性加速度计

这篇文章提供的设计鉴定试验（ＤＶＴ）的数据，表明了在许多军用典型环境条件下提高稳定性的要求已在新设计的增强型低成本加速度计ＱＡ６５０上实现。设计鉴定试验及随后的测试证明，在保持成本的前提下，ＱＡ６５０性能的提高已使其成为耐高量级冲击（２００ｇ）及随机振动（２５＋ｇＲＭＳ）环境下的可供选择使用的产品。     

石英摆片成形工艺研究

介绍了石英摆片磨料喷射加工、超声波加工等成形工艺，并在此基础上，提出了用ＣＷ ＣＯ２ 激光器切割石英摆片的新方法，给出了石英摆片激光切割的主要切割参数，并对使用不同成形切割方法切割石英摆片的切割质量，进行了比较和分析。     

Experimental study on effect of inclination angles to ammonia pulsating heat pipe

In this paper, a novel study on performance of closed loop pulsating heat pipe（CLPHP）using ammonia as working fluid is experimented. The tested CLPHP, consisting of six turns, is fully made of quartz glass tubes with 6 mm outer diameter and 2 mm inner diameter. The filling ratio is50%. The visualization investigation is conducted to observe the oscillation and circulation flow in the CLPHP. In order to investigate the effects of inclination angles to thermal performance in the ammonia CLPHP, four case tests are studied. The trends of temperature fluctuation and thermal resistance as the input power increases at different inclination angles are highlighted. The results show that it is very easy to start up and circulate for the ammonia CLPHP at an inclining angle.The thermal resistance is low to 0.02 K/W, presenting that heat fluxes can be transferred from heating section to cooling section very quickly. It is found that the thermal resistance decreases as the inclination angle increases. At the horizontal operation, the ammonia CLPHP can be easy to start up at low input power, but hard to circulate. In this case, once the input power is high,the capillary tube in heating section will be burnt out, leading to worse thermal performance with high thermal resistance.     

基于MEMS陀螺的低成本捷联惯导系统设计

介绍了一种基于MEMS陀螺和石英挠性加速度计的低成本捷联惯性导航系统的设计与实现方法。给出了惯性测量单元(IMU)的模型方程,并在全温下对IMU的输出进行补偿;采用"四元数"法进行姿态计算,通过坐标变换、积分运算确定载体的速度、位置;对惯测样机进行了60 s的静态测试,结果表明该系统短期准确度满足SINS/GPS组合导航系统需求。