搜索结果: 1-15 共查到“工学 Raman”相关记录87条 . 查询时间(0.062 秒)
光电信息大讲堂第210期:From discovery of random Raman lasing via natural Rayleigh scattering in ultra-long fibers to unique lasing and sensing features of multimode and multicore fibers with fs-inscribed regular and random 3D refractive-index structures
拉曼光纤激光器 输出光束 折射率光纤
2023/4/17
在二极管泵浦的拉曼光纤激光器的多模渐变折射率光纤中,通过飞秒脉冲刻写FBG,可产生接近衍射极限的输出光束。这一技术已经应用于工业(通信、生物医学、材料加工、基础设施和能源行业)中的各种激光和传感器系统。从超长光纤自然瑞利散射引起的随机拉曼激光的发现出发,主讲人将介绍使用fs脉冲刻写具有规则/随机的3D折射率结构的多模、多芯光纤的技术,以及新型光纤所具有的独特激光和传感性能,这种新型光纤有望在物理上...
COMBINATION OF RAMAN LIDAR AND MICROWAVE RADIOMETER SENSED WATER VAPOUR DATA
Raman Lidar Microwave Radiometer
2015/9/8
The international LAUNCH (International Lindenberg campaign for assessment of humidity and cloud
profiling systems and its impact on high璻esolution modelling) campaign took place in late summer/early...
基于纯转动Raman激光雷达的中低空大气温度高精度探测
激光雷达 大气温度 热结构
2015/7/27
本文介绍了一套纯转动Raman测温激光雷达系统,通过高分辨光谱分光与滤光优化设计、收发精确匹配以及弱信号检测等技术,实现在武汉城市上空从10 km至40 km的中低空大气温度高精度探测.观测结果与同时段探空气球进行比对,在30 km以下激光雷达探测温度与探空气球得到的温度数据吻合较好,最大偏差约为3.0 K,表明了该激光雷达温度测量的可靠性.采用30 min时间分辨率,在10~20 km高度范围内...
![](http://www.firstlight.cn/upload/imgfile/201412/31/2014123185954431.png)
Associate Professor Ganesh G. Raman,The Fluid Dynamics Research Center,FDRC(图)
Associate Professor Ganesh G. Raman The Fluid Dynamics Research Center,FDRC
2014/12/31
Associate Professor Ganesh G. Raman,The Fluid Dynamics Research Center,FDRC,Scientific and Professional Society Memberships
American Institute of Aeronautics and Astronautics, Associate Fellow
Amer...
Raman-Mie方法反演气溶胶后向散射系数
转动拉曼散射 弹性散射 后向散射系数
2012/12/6
传统的Klett和Fernald反演气溶胶法依赖于消光系数和后向散射系数的假设关系,给反演结果带来误差。根据纯转动拉曼后向散射系数仅是大气温度和压强的函数,设计的RamanMie方法用米散射和纯转动拉曼回波信号结合探空温度和大气压强共同反演气溶胶后向散射系数。不仅消除了Klett和Fernald方法引入假设带来的误差,还可避免因几何因子修正带来的影响。最后将该方法用于实验室自行研制的拉曼米散射...
Temperature Dependence of the Raman Intensity and the Bandwidth Close to the Order-Disorder Phase Transition in NaNO3
Raman Intensity Bandwidth NaNO3
2013/1/30
We analyze the temperature dependence of the Raman intensity using the experimental data according to a power-law formula close to the order-disorder transition (Tc = 549 K) in NaNO 3. From this analy...
检测了地塞米松磷酸钠和倍他米松磷酸钠两种差向异构体的红外光谱(FTIR), 固体和饱和溶液的常规拉曼光谱(NRS)及以银胶为基底的表面增强拉曼光谱(SERS)。通过红外和拉曼光谱的结合,对其各基团的振动模式进行解析,并对峰进行归属和比较。结果表明:两种物质的主要区别是地塞米松磷酸钠的CH3非对称伸缩振动和对称面内变形振动的拉曼位移较大;依据SERS作用机理和规律,推测两种物质在银胶上主要是通过P—...
研究和发展了一种将微区拉曼(Raman)光谱检测与原子力显微镜(AFM)微纳米扫描成像相结合的新型Raman-AFM技术。设计了Raman光谱与AFM扫描成像的原位检测探头;研制出相应的Raman-AFM系统;利用该系统,对ZnO纳米颗粒和TiO2纳米薄膜开展了微区Raman光谱与微纳米结构的检测实验。研究表明,所获得的Raman光谱检测结果与理论值良好吻合,同时,AFM扫描检测得到的图像很好地表...
合肥上空大气二氧化碳Raman激光雷达探测研究
大气光学 Raman激光雷达 大气CO2体积混合比 合肥
2012/12/12
Raman激光雷达是用于大气成分探测与特性研究的有效工具.介绍了中科院安徽光学精密机械研究所自行研制的一台用于测量低对流层大气CO2时空分布的Raman激光雷达系统,并进行了一系列观测实验和对比分析.系统选用波长355 nm的紫外激光作为光源,利用光子计数卡双通道采集大气中N2和CO2的Raman后向散射信号与Li-7500型H2O/CO2分析仪进行对比标定,通过反演获得了大气CO2水平与垂直方向...
KTP晶体的激光烧蚀特性及Raman光谱研究
KTP晶体 激光烧蚀 激光等离子体 Raman光谱
2012/8/17
高阈值的KTP晶体的研发,对高能激光领域至关重要。采用高重复频率的紫外激光对KTP进行烧蚀,并对烧蚀前后的Raman光谱进行分析,研究发现:激光等离子体效应是造成晶体破坏的主要原因,其逆韧致吸收效应会大大增加激光脉冲能量的沉积,电离效应使得晶体发生充分的离解,高压冲击波效应则把熔化、气化以及电离混合物外排的同时,使得材料发生断裂。烧蚀前后的Raman光谱的特征峰分布基本相同,说明烧蚀作用没有改变K...
Evaluation of structural changes in raw and heated meat batters prepared with different lipids using Raman spectroscopy
Meat batter Fat Oil Thermal treatment Raman spectroscopy
2012/8/14
Structural changes, textural properties, water- and fat-binding properties and their relationships in meat batters prepared with different lipids and with heating were studied by Raman spectroscopy. R...
基于动态多段温度标定的分布式光纤Raman测温系统
分布式测温 喇曼散射 动态标定 温度解调
2011/12/20
温度标定是分布式光纤喇曼测温系统重要组成部分.本文设计了一种基于半导体制冷模块的多温度参考标定装置,采用了新颖的动态多段光纤温度标定方法,并通过实验验证了该标定方案的可行性与准确性.结果表明,随着外界环境温度的变化,传感光纤所处任一处的温度都能够精确解调,其温度解调结果更加准确,测量误差小于1 ℃.系统性能更加稳定,更能够适应复杂的环境变化.
Comparison of Optical Fiber Types for All-Raman Systems
Fiber optics communications Fiber optics links subsystems
2015/5/25
We experimentally explore several optical fibers for all-Raman systems. We find that while NZ-DSF with small A eff may require slightly smaller pump power, its OSNR disadvantage is approximately 5 dB ...
Characterization of Short PM Raman Fiber Lasers with a Small Spectral Bandwidth
Characterization Short PM Raman Fiber Lasers Small Spectral Bandwidth
2015/5/20
Linearly polarized Raman fiber lasers using 3 m and 6 m of a novel fiber are discussed. Experimental and theoretical results for output powers at watt levels and spectral widths in the 0.1 nm range ar...