1 自适应光学全国重点实验室,四川 成都 610209
2 中国科学院光电技术研究所,四川 成都 610209
3 中国科学院大学,北京 100049
4 山东高等技术研究院,山东 济南 250100
Overview: Gravitational waves are spacetime oscillations radiated outward by accelerating mass objects. Significant astronomical events in the universe, such as the merging of massive black holes, emit stronger gravitational waves. Detecting gravitational waves allows for a deeper study of the laws governing celestial bodies and the origins of the universe, making accurate detection crucial. Gravitational wave detection technology utilizes Michelson interferometers to convert the extremely faint spacetime fluctuations caused by gravitational waves into measurable changes in optical path length. Recently, ground-based large Michelson interferometers have achieved direct detection of high-frequency gravitational waves. However, the detection of low-frequency gravitational waves, which is equally important, is not feasible on the ground due to arm length and ground noise issues. This necessitates the construction of ultra-large Michelson interferometers in space for low-frequency gravitational wave detection. Spaceborne gravitational wave detection telescopes play a vital role in collimating bidirectional beams in ultra-long interferometric optical paths in space. The extremely subtle changes in optical path caused by gravitational waves impose high demands for pm-level optical path length stability and below 10?10 level backscattered light in these telescopes. The ultra-high level index requirements exceed the precision limits of current ground testing techniques for telescopes. To ensure that spaceborne telescopes maintain their ultra-high design performance in the orbital environment, developing testing and evaluation techniques for these key indicators is a crucial prerequisite for the success of the space gravitational wave detection program. This paper provides an overview of the development of spaceborne gravitational wave detection telescopes, both domestically and internationally. It focuses on the current status and some test results of optical path length stability and backscattered light testing of telescopes under development, as well as further testing plans, providing a reference for the testing and evaluation of Chinese space gravitational wave detection space-borne telescopes.
空间引力波探测 星载望远镜 地面测试 光程稳定性 后向杂散光 space gravitational wave detection spaceborne telescope ground test optical path length stability backscattered light
强激光与粒子束
2024, 36(4): 043003
强激光与粒子束
2024, 36(2): 025019
强激光与粒子束
2024, 36(1): 013006
1 北京应用物理与计算数学研究所,北京 100094
2 中国工程物理研究院 研究生部,北京 100088
当前,科学计算的验证主要针对基于确定性偏微分方程组的网格离散方法。放电等离子体的粒子云网格PIC方法作为一种粒子-网格耦合的仿真手段,其验证方法具有显著不同的特点:第一,PIC仿真除了在时间和空间上进行离散,还需要对粒子数权重进行离散;第二,离散粒子的相空间分布函数是否适合作为验证研究的观测量;第三,粒子-网格耦合过程中的电场插值和电荷分配会影响PIC仿真的全局收敛精度。另外,当PIC方法与蒙特卡罗(MC)方法耦合时,离散误差和随机误差通常叠加在一起,理查德森外推需要结合系综平均进行。提出了一种分层级验证的方法。首先对单粒子轨道、电磁场求解、二体粒子碰撞进行收敛精度阶测试;然后采用空间电荷限制流、气体的傅里叶流动等具有精确解的经典物理模型分别对集成PIC、MC模块进行离散误差评估;最后采用放电物理过程对程序功能进行基准校验。
PIC方法 验证技术 精度阶测试 放电模拟 PIC method verification techniques order of accuracy test discharge simulation 强激光与粒子束
2024, 36(3): 033002
1 上海市质量监督检验技术研究院,上海 200031
2 中国科学院长春光学精密机械与物理研究所,吉林 长春 130033
针对无人机载光电平台的安装特点,文中对平台及阻尼减振器特性进行了分析、建模与测试。首先,对光电平台阻尼减振器特性进行了介绍;其次,分析了安装阻尼减振器后的光电平台特性,并对阻尼减振器的运动特性进行建模,分析阻尼减振器安装布局与平台性能之间的关系;最后,结合具体某型光电平台及其配套阻尼减振器,给出了仿真结果及相同外部扰动条件下减振器安装位置对平台性能的测试结果。结果表明:相关研究对优化无人机载光电平台阻尼减振器布局及提升载荷整体性能具有积极的意义。
无人机 光电平台 阻尼减振器 运动建模 性能测试 UAV EO payload damper motion model performance test 红外与激光工程
2024, 53(1): 20230432
中国飞行试验研究院 技术中心测试所,陕西 西安 710089
近年来随着航空电子数字视频总线(avionics digital video bus,ADVB)的快速发展,ADVB逐渐替代了机载原有的数字视频接口(digital visual interface,DVI)、视频图形阵列(video graphics array,VGA)、低电压差分信号(low-voltage differential signal,LVDS)等视频传输方式,在先进战斗机、民机、直升机、教练机等新型试验机航电系统中成为重要的数据载体。面对新型视频总线测试,现有的试验测试方法已经不能满足要求。从基础协议研究出发,结合机载航电系统的接口控制文件(interface control document,ICD)结构特征信息,通过自适应识别、重采样、时序重构等技术途径,完成了高速率、多样化视频格式的自适应处理,实现了多型机的通用化测试;通过搭建试验平台,成功实现1 680×1 050@60 fps等非常规视频、2 560×1 024 @30 fps等高分辨率视频的采集记录。回放视频数据完整清晰,验证了本文方法的有效性。设计的测试系统兼容现有的视频测试现状,能够有效降低试飞成本,提高试飞效率。
ADVB协议 重采样 通用化测试 飞行试验 ADVB protocol resampling generalized test flight test
光纤在低温环境下的使用越来越广泛,更加优异的低温用涂料和光纤低温性能的研究探索也逐步深入。采用3种不同涂料的G652单模光纤进行光纤抗压力测试,对抗压力测试后的光纤表面形貌进行分析,同时对低温试验后光纤的涂层抗压力与附加衰减性能进行测试表征。实验结果表明:光纤自身抗压力值越大,其低温附加衰减值越小,耐低温性能就越佳,且低温测试前后的光纤抗压力值差异较小。
不同涂料 抗压力测试 低温性能 附加衰减 different coatings, pressure resistance testing, l