Author Affiliations
Abstract
1 School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China
2 Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China
3 Key Laboratory of Vascular Aging, Ministry of Education, Tongji Hospital Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
4 State Key Laboratory of Material Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
5 Shenzhen Huazhong University of Science and Technology Research Institute, Shenzhen 518063, China
Curvature sensing plays an important role in structural health monitoring, damage detection, real-time shape control, modification, etc. Developing curvature sensors with large measurement ranges, high sensitivity, and linearity remains a major challenge. In this study, a curvature sensor based on flexible one-dimensional photonic crystal (1D-PC) films was proposed. The flexible 1D-PC films composed of dense chalcogenide glass and water-soluble polymer materials were fabricated by solution processing. The flexible 1D-PC film curvature sensor has a wide measurement range of 33–133 m-1 and a maximum sensitivity of 0.26 nm/m-1. The shift of the transmission peak varies approximately linearly with the curvature in the entire measurement range. This kind of 1D-PC film curvature sensor provides a new idea for curvature sensing and measurement.
curvature sensor one-dimensional photonic crystals solution processing chalcogenide glass flexible film Chinese Optics Letters
2024, 22(2): 021601
Author Affiliations
Abstract
1 College of Electronics and Information, Hangzhou Dianzi University, Hangzhou 310018, China
2 College of Physics, Huazhong Normal University, Wuhan 430079, China
A DC current sensor based on an optically pumped atomic magnetometer is proposed. It has a high linearity in a wide operation range, since the magnetometer measures the absolute magnitude of the magnetic field produced by the current to be measured. The current sensor exhibits a high accuracy with a non-moment solenoid and magnetic shielding to suppress the influence from the environment. The absolute error of the measured current is below 0.08 mA when the range is from 7.5 mA to 750 mA. The relative error is 5.54 × 10?5 at 750 mA.
current sensor atomic magnetometer high accuracy Chinese Optics Letters
2020, 18(3): 031202
1 南京市产品质量监督检验院, 江苏 南京 210028
2 南京大学化学化工学院, 江苏 南京 210023
3 浙江省检验检疫科学技术研究院, 浙江 杭州 311215
自然界植物物种中存在小分子有机化合物的荧光特征信息用于识别其身份具有潜在的应用价值。 目前, 基于木材解剖学特征的交趾黄檀和奥氏黄檀木材树种鉴定存在一定的局限性。 该研究从荧光特征出发探索两个红木树种的识别新方法。 分别对5组交趾黄檀和5组奥氏黄檀木材样品中的荧光物质进行完整提取, 通过荧光照片、 二维荧光谱图、 三维荧光谱图对两个红木样品存在的荧光物质种类和数量进行了确认。 荧光照片结果显示交趾黄檀和奥氏黄檀均呈现明显的荧光特征且随着存贮时间的变化荧光物质能够稳定存在; 二维荧光谱图和三维荧光谱图更加详细地展示了两个树种各自的荧光特征, 结果显示交趾黄檀提取液含有一种荧光物质, 该物质的最大激发波长为297 nm, 最大荧光发射波长为327 nm; 奥氏黄檀提取液的荧光谱图呈现两个最大激发和两个最大发射, 最大激发波长分别为317和333 nm, 最大荧光发射波长分别为342和358 nm, 表明奥氏黄檀提取液中包含两种荧光物质或者存在一种含两种荧光团的荧光物质。 另外, 不同来源的两个红木试样存在的荧光物质数量和特征各自具有明显的一致性, 且两种树种之间存在明显的区别, 表明荧光特征能够用于它们身份的识别。 此外, 该研究构建了交趾黄檀和奥氏黄檀两个红木树种的荧光物质提取方法, 交趾黄檀荧光物质的最佳提取试剂为乙腈, 体积比为10∶1的乙酸乙酯和乙腈混合试剂更加适用于奥氏黄檀, 且两种荧光物质的提取均在12 h内达到稳定。 研究结果表明荧光光谱技术能够用于交趾黄檀和奥氏黄檀的识别与鉴定, 该方法在红木树种的鉴定具有十分重要的应用价值。
荧光光谱技术 交趾黄檀 奥氏黄檀 识别新方法 Fluorescent spectroscopy Dalbergia cochinchinensis Pierre Dalbergia oliveri Prain New method for rosewood identification 光谱学与光谱分析
2019, 39(7): 2182
1 西南技术物理研究所, 成都 610041
2 电子科技大学光电子技术系, 成都 610054
3 江汉石油学院理学院, 荆州 434102
掺铒光波导放大器在工作波长为1.5 fim的集成光通讯中有广泛的应用前景。它具有高增益, 抽运阈值低, 器件尺寸小,易于集成的特点。目前用于光波导放大器的掺铒材料有四类: 氧化物薄膜(Al2O3)、有机物和单晶硅、 无机玻璃等。
光波导 放大器 材料 铒离子
