Author Affiliations
Abstract
1 College of Electronic and Optical Engineering & College of Flexible Electronics (Future Technology), Nanjing University of Posts and Telecommunications, Nanjing 210023, China
2 National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences, Nanjing University, Nanjing 210093, China
3 State Key Laboratory of Millimeter Waves, Southeast University, Nanjing 210096, China
This study investigated direct fluorescence generation from a nematic liquid crystal (NLC) NJU-LDn-4 under femtosecond laser excitation. The absorption, transmittance, excitation, and emission spectra of the NLC were assessed. The relationship between the femtosecond pump power and fluorescence intensity was analyzed, revealing a quadratic increase and indicating that two-photon absorption (2PA) is the primary fluorescence mechanism. The LC microstructure was designed using photoalignment technology, allowing the generated fluorescence to reflect the corresponding structure. This research can establish a foundation for tunable LC microstructured fluorescence, with potential applications in fluorescence microscopy and optoelectronics.
liquid crystal femtosecond laser fluorescence microstructure Chinese Optics Letters
2024, 22(3): 033801
红外与激光工程
2023, 52(3): 20220587
Author Affiliations
Abstract
School of Electrical and Information Engineering, Anhui University of Technology, Maanshan 243000, China
In this paper, the shape of the object is reconstructed based on the fiber Bragg grating (FBG) flexible sensor encapsulated by polydimethylsiloxane (PDMS) material, and the influence of the number and layout of the sensors on the reconstruction accuracy of the object is studied. The COMSOL simulation software is used to verify the accuracy of the algorithm, and four sensors are prepared to measure and reconstruct the bent aluminum plate under set conditions. The maximum relative error of the shape reconstruction span is 1.203%, and the maximum relative error of the height is 2.802%. The research results provide the application basis for the shape detection of soft robots.
光电子快报（英文版）
2022, 18(8): 454
1 安徽省高校电力电子与运动控制重点实验室（安徽工业大学），安徽 马鞍山 243000
2 安徽工业大学 电气与信息工程学院，安徽 马鞍山 243000
3 山东华宁矿业集团有限公司，山东 泰安 271400
针对强电磁干扰环境下，压电、光电类脉搏波传感器易受干扰的缺点，提出一种柔性材料封装的光纤布拉格光栅脉搏波传感器，用于测量人体桡动脉脉搏信号。首先使用comsol有限元仿真软件，探究最优的封装厚度和光纤在基材中的位置。根据仿真结果，结合应变传递效果和传感器的灵活性，优化选择传感器厚度为5 mm，光纤封装在距离基体下表面1 mm处。以此制作了柔性光纤布拉格光栅脉搏波传感器，对十名测试者的人体桡动脉脉搏进行采集，采用改进的阈值小波方法去噪，去噪后的信号能很好的保留脉搏波信号的特征点，信噪比均达到了40以上，且峰值点、潮波点和重搏波点识别率分别达到100%，100%和90%。本文设计的柔性基体FBG脉搏波传感器能有效获取及识别脉搏波信号，为进一步的应用提供了理论基础及应用支撑。
光纤布拉格光栅 应变传递 脉搏波 小波去噪 Fibre Bragg grating Strain transfer Pulse wave Wavelet denoising 光子学报
2021, 50(12): 1206002
Author Affiliations
Abstract
1 School of Electrical and Information Engineering, Anhui University of Technology, Maanshan 243000, China
2 The Second Construction Co., Ltd. of China Construction First Group, Beijing 100161, China
To discuss the relative slipping at the interface between a flexibly embedded fiber Bragg grating sensor and a substrate, the strain transfer was derived for an ideal case between the materials of an embedded fiber sensor. ANSYS software was used to establish a simulation model and to analyze the effects of the axial tensile force and the semi-embedded length and encapsulation substrate for the axial strain relative errors with and without relative slipping. The results of the numerical simulations show that the relative strain errors are smaller at the ends of the fibers and larger in the middle for the same tensile force, indicating that the strain transfer effect is location dependent and that the choice of a semi-embedded length of the fibers greater than 40 mm helps to reduce the relative errors. Meanwhile, five flexible sensors with different half-embedding lengths were experimentally encapsulated and subjected to axial tension-strain experiments, which showed the best strain transfer at a half-embedding length of 60 mm, and the experimental results were consistent with the numerical simulation results. The experimental results provide some theoretical and experimental basis for parameter optimization of flexible fiber grating sensors.
光电子快报（英文版）
2021, 17(10): 604
1 南京邮电大学电子与光学工程学院 微电子学院, 江苏 南京 210023
2 南京大学固体微结构物理国家重点实验室, 江苏 南京 210093
3 南京大学智能光传感与调控技术教育部重点实验室, 江苏 南京 210093
设计一种三维多孔石墨烯(3DPG)辅助胆甾相液晶胶囊(CLCM)的新型功率探测器,用于测量高强度THz波。3DPG在频率为0.5~1.5 THz时具有超过97%的高吸收率。利用温度超灵敏CLCM的热色特性,对稳态下的THz功率进行可视化定量研究,THz功率密度高达2.77×10 2 mW/cm 2,最低探测功率仅为0.009 mW。进一步研究发现,3DPG上溅射少量金纳米颗粒后,THz功率与CLCM的Hue值呈线性关系。该可视化探测器结构简单、便携、成本低廉、高效实用,可应用于THz系统的对准、THz波的光束分析及THz成像和传感中。
探测器 胆甾相液晶胶囊 三维多孔石墨烯 太赫兹探测器 可视化探测 光学学报
2020, 40(17): 1704002
1 太钢自动化公司， 太原 山西030003
2 太原大学机电系， 太原 山西030009
提出一种基于粒子群优化算法实现的硅钢涂层厚度近红外光谱检测新方法。 首先， 采用近红外光谱仪采集获得了硅钢表面绝缘涂层的近红外光谱， 然后， 采用离散粒子群算法筛选出近红外光谱数据的最佳波长变量并组成新的光谱数据， 最后， 建立涂层厚度的核偏最小二乘定量分析模型。 实验显示， 所建定量分析模型对检验样本分析的绝对误差范围为-0.12～0.19 μm， 最大相对误差为14.31%， 完全符合现场检验需要。 研究表明， 离散粒子群算法可以有效地筛选出携带更多有用信息的波长变量， 提高定量分析模型的分析准确度和速度， 是一种有效的近红外光谱波长筛选方法， 同时， 近红外光谱法也是一种有效的硅钢绝缘涂层厚度检测方法。
离散粒子群优化算法 波长筛选 硅钢涂层 厚度分析 DBPSO Wavelength selection Insulation coating of silicon steel Thickness analysis 光谱学与光谱分析
2011, 31(9): 2416
中国地质大学(武汉) 材料科学与化学工程学院, 湖北 武汉 430074
采用共沉淀法结合高温固相法, 在碳还原气氛下合成了SrCO3∶Mn2+绿色荧光粉, 用XRD和荧光光谱分别对样品的结构和发光性能进行了表征。XRD结果证实, 样品为单一斜方晶系的SrCO3相; 荧光光谱检测表明, 样品在267 nm左右紫外线激发下, 产生峰位位于547 nm的明亮绿光, 对应于Mn2+的4T1(4G)→6A1(6S)电子跃迁。样品的最佳烧结温度为1 000 ℃, Mn2+的最佳掺杂摩尔分数为2.0%。
共沉淀法 发光 SrCO3∶Mn2+ SrCO3∶Mn2+ co-precipitation method luminescence
