彭加力 1,2,3阮萍 1,3,*谢友金 1,3李治国 1,3[ ... ]韩璟宇 1,2,3
作者单位
摘要
1 中国科学院西安光学精密机械研究所,西安 710119
2 中国科学院大学,北京 100049
3 中国科学院空间精密测量技术重点实验室,西安 710119
针对目前利用有限元方法分析星载光电跟瞄转台动态特性时存在的建模失真问题,提出使用广义弹簧单元对轴承和锁紧机构等效建模,并通过定义模态阻尼比,精确模拟转台的固有频率及响应特性。通过理论计算和基于模态试验数据的参数辨识,确定各等效单元刚度;通过基于扫频试验数据的参数辨识,确定结构模态阻尼。基于建立的等效有限元模型进行仿真分析,模态分析中前6阶固有频率与试验结果的最大偏差为5.1%,谐响应分析中X、Y、Z三个主方向的最大响应与试验结果的最大偏差为3.2%,固有频率与响应一致性良好,均在允许的误差范围内。说明使用广义弹簧单元对轴承和锁紧机构进行等效建模,通过模态和扫频试验数据确定转台刚度和阻尼特性是可行的,对同类型转台的建模仿真有一定借鉴作用。
精密仪器与机械 动态特性 等效建模 星载光电跟瞄转台 刚度与阻尼 固有频率 振动响应 有限元分析 Precision instrument and machinery Dynamic characteristic Equivalent modeling Space Electro-optical tracking and pointing turntable Stiffness and damping Natural frequency Vibration response Finite element analysis 
光子学报
2023, 52(7): 0712002
作者单位
摘要
宁波大学压力容器与管道安全浙江省工程研究中心, 宁波 315000
干湿交替和硫酸盐腐蚀引起的损伤严重影响导电混凝土服役时的长期稳定性。本研究以碳纤维、石墨作为导电相材料, 掺入粉煤灰和硅灰制备导电混凝土, 在干湿交替和硫酸盐腐蚀耦合作用下, 讨论粉煤灰、硅灰掺量对导电混凝土力学性能与电学性能的影响。综合导电混凝土的力学性能与电学性能衰变定义了服役性能劣化指标。结果表明: 掺入粉煤灰和硅灰后提升了导电混凝土在干湿交替和硫酸盐腐蚀下的耐久性和导电稳定性; 当粉煤灰和硅灰的总掺量一定时, 提高粉煤灰占比能够有效降低干湿交替和硫酸盐腐蚀造成的强度损失, 并提高导电混凝土的导电稳定性。
导电混凝土 干湿交替 硫酸盐腐蚀 电阻率 配合比 优化设计 conductive concrete alternating wetting and drying sulfate corrosion electrical resistivity mix ratio optimal design 
硅酸盐通报
2023, 42(2): 463
Author Affiliations
Abstract
1 Electronic Information School, Wuhan University, Wuhan 430072, China
2 Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China
3 Peng Cheng Laboratory, Shenzhen 518055, China
4 Wuhan Institute of Quantum Technology, Wuhan 430206, China
For a conventional cascaded metasurface, the combination channel and each single channel are mutually dependent because the phase modulation of a cascaded metasurface is the sum of each single one. Here we propose a cascaded metasurface that can independently encode information into multiple channels. Based on the orientation degeneracy of anisotropic metasurfaces, each single metasurface can produce a quick-response (QR) image in the near field, governed by the Malus law, while the combined channel can produce a holographic image in the far field, governed by geometric phase. The independent and physically separated trichannel design makes information encryption safer.
cascaded metasurfaces optical encryption holography nanoprinting 
Chinese Optics Letters
2023, 21(2): 020003
作者单位
摘要
1 中国计量大学光学与电子科技学院,浙江 杭州 310018
2 澳门科技大学资讯科技学院,中国 澳门 999078

本文提出并制备了一个基于游标效应的高灵敏度光纤气压传感器。该传感器包含两个并联的法布里-珀罗干涉仪(FPI),它们均由单模光纤和一小截毛细管熔接构成,分别作为传感腔和参考腔,且其中传感腔的侧面刻蚀微通道,以便于待测气体进入。俩干涉仪间较小的光程差导致传感器产生具有游标效应的叠加反射光谱,气压灵敏度得到极大的提高,达到~64 pm/kPa,该值是单一FPI的~16倍。另外,实验结果显示,该传感器对温度不敏感,从而减少了环境温度对气压测量结果的影响。结构结实、气压灵敏度高等优点,预示着该传感器在工业生产、气体检测等领域具有广阔的应用前景。

 

光纤传感 法布里-珀罗干涉仪 游标效应 气压 optical fiber sensor Fabry–Perot interferometer vernier effect gas pressure 
光电工程
2022, 49(8): 210420
Author Affiliations
Abstract
1 Institute of Neuroscience, Department of Neurobiology, Key Laboratory of Medical Neurobiology of the Ministry of Health of China, Zhejiang Province Key Laboratory of Neurobiology, Zhejiang University, School of Medicine, Hangzhou, Zhejiang 310058, P. R. China
2 State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, and the Collaborative Innovation Center for Brain Science, Zhejiang University, Hangzhou, Zhejiang 310027, P. R. China
Optical microscopy promises researchers to see most tiny substances directly. However, the resolution of conventional microscopy is restricted by the diffraction limit. This makes it a challenge to observe subcellular processes happened in nanoscale. The development of superresolution microscopy provides a solution to this challenge. Here, we briefly review several commonly used super-resolution techniques, explicating their basic principles and applications in biological science, especially in neuroscience. In addition, characteristics and limitations of each technique are compared to provide a guidance for biologists to choose the most suitable tool.
Super-resolution microscopy total internal reflection fluorescence microscopy stimulated emission depletion microscopy structure illumination microscopy photoactivation localization microscopy stochastic optical reconstruction microscopy. 
Journal of Innovative Optical Health Sciences
2017, 10(5): 1730001

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